Acoustics - Measurement of sound insulation in buildings and of building elements - Part 14: Guidelines for special situations in the field (ISO 140-14:2004)

ISO 140-14:2004 concerns field measurements of airborne sound insulation and impact sound insulation, and is to be used as a supplement to ISO 140-4 and ISO 140-7. It contains guidelines on sound insulation measurements in special situations in the field not directly covered by ISO 140-4 and ISO 140-7.
The basic standards ISO 140-4 and ISO 140-7 specify the measurement procedure in detail under ideal conditions, but give only little information on how to establish a suitable measurement set-up in rooms differing from simple box-shaped rooms of normal living room size. When it comes to very large rooms, long and narrow rooms, staircases, coupled rooms, etc., no guidance is given in the basic standards, which is why the guidelines in ISO 140-14:2004 have been prepared. Use of the guidelines will contribute to improvement in the reproducibility of building acoustics field measurements and furthermore facilitate the performance of measurements by avoiding time-consuming considerations in actual measurement situations.
ISO 140-14:2004 is primarily applicable to measurements in rooms in dwellings, schools, hotels, etc., with volumes less than 250 m3.

Akustik - Messung der Schalldämmung in Gebäuden und von Bauteilen - Teil 14: Leitfäden für besondere bauliche Bedingungen (ISO 140-14:2004)

Dieser Teil der ISO 140 behandelt Messverfahren für die Luftschalldämmung und Trittschalldämmung in Gebäuden und ist ergänzend zu ISO 140-4 und ISO 140-7 anzuwenden. Er enthält Leitfäden zum Messen der Schalldämmung bei besonderen baulichen Bedingungen, die nicht durch ISO 140-4 und ISO 140-7 abgehandelt sind.
ANMERKUNG   Die Grundnormen ISO 140-4 und ISO 140-7 legen die genauen Beschreibungen der Messverfahren unter Idealbedingungen fest, liefern allerdings sehr wenig Informationen über die Aufstellung einer geeigneten Messanordnung für Räume, deren Form nicht der einfachen Kastenform mit gewöhnlicher Wohnraumgröße entspricht. Für sehr große Räume, lange und schmale Räume, Treppenräume, verbundene Räume usw., sind in den Grundnormen keine Leitfäden angegeben, weshalb die Leitfäden in diesem Teil erarbeitet wurden. Die Anwendung dieser Leitfäden wird die Vergleichbarkeit von Feld-Messungen der Gebäudeakustik verbessern und durch Vermeiden von zeitaufwendigen Vorbetrachtungen zu gegebenen Messsituationen die Durchführung der Messungen erleichtern.
Dieser Teil der ISO 140 ist hauptsächlich für Messungen in Räumen von Wohngebäuden, Schulen, Hotels usw. mit einem kleineren Volumen als 250 m3 gültig.
Soweit nicht anders festgelegt, ist die Anwendung dieser Leitfäden in Verbindung mit Messungen nach ISO 140-4 und ISO 140-7 nicht verbindlich.

Acoustique - Mesurage de l'isolation acoustique des immeubles et des éléments de construction - Partie 14: Lignes directrices pour des situations particulieres in situ (ISO 140-14:2004)

Acoustique - Mesurage de l'isolation acoustique des immeubles et des éléments de construction - Partie 14: Exigences supplémentaires et lignes directrices pour des situations particulieres dans le champ (ISO/DIS 140-14:2002)

Akustika - Merjenje zvočne izolirnosti v stavbah in zvočne izolirnosti stavbnih elementov - 14. del: Smernice za posebne primere na terenu (ISO 140-14:2004)

General Information

Status
Withdrawn
Publication Date
31-Jan-2005
Withdrawal Date
01-Mar-2016
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
01-Mar-2016
Due Date
24-Mar-2016
Completion Date
02-Mar-2016

RELATIONS

Buy Standard

Standard
SIST EN ISO 140-14:2005
English language
33 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 140-14:2005
01-februar-2005
$NXVWLND0HUMHQMH]YRþQHL]ROLUQRVWLYVWDYEDKLQ]YRþQHL]ROLUQRVWLVWDYEQLK
HOHPHQWRYGHO6PHUQLFH]DSRVHEQHSULPHUHQDWHUHQX ,62

Acoustics - Measurement of sound insulation in buildings and of building elements - Part

14: Guidelines for special situations in the field (ISO 140-14:2004)
Akustik - Messung der Schalldämmung in Gebäuden und von Bauteilen - Teil 14:
Leitfäden für besondere bauliche Bedingungen (ISO 140-14:2004)
Acoustique - Mesurage de l'isolation acoustique des immeubles et des éléments de

construction - Partie 14: Lignes directrices pour des situations particulieres in situ (ISO

140-14:2004)
Ta slovenski standard je istoveten z: EN ISO 140-14:2004
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
SIST EN ISO 140-14:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 140-14:2005
---------------------- Page: 2 ----------------------
SIST EN ISO 140-14:2005
EUROPEAN STANDARD
EN ISO 140-14
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2004
ICS 91.120.20
English version
Acoustics - Measurement of sound insulation in buildings and of
building elements - Part 14: Guidelines for special situations in
the field (ISO 140-14:2004)

Acoustique - Mesurage de l'isolation acoustique des Akustik - Messung der Schalldämmung in Gebäuden und

immeubles et des éléments de construction - Partie 14: von Bauteilen - Teil 14: Leitfäden für besondere bauliche

Lignes directrices pour des situations particulières in situ Bedingungen (ISO 140-14:2004)

(ISO 140-14:2004)
This European Standard was approved by CEN on 22 July 2004.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 140-14:2004: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 140-14:2005
EN ISO 140-14:2004 (E)
Foreword

This document (EN ISO 140-14:2004) has been prepared by Technical Committee ISO/TC 43

"Acoustics" in collaboration with Technical Committee CEN/TC 126 "Acoustic properties of

building products and of buildings", the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of

an identical text or by endorsement, at the latest by February 2005, and conflicting national

standards shall be withdrawn at the latest by February 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of

the following countries are bound to implement this European Standard: Austria, Belgium,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,

Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice

The text of ISO 140-14:2004 has been approved by CEN as EN ISO 140-14:2004 without any

modifications.
---------------------- Page: 4 ----------------------
SIST EN ISO 140-14:2005
INTERNATIONAL ISO
STANDARD 140-14
First edition
2004-08-01
Acoustics — Measurement of sound
insulation in buildings and of building
elements —
Part 14:
Guidelines for special situations in the
field
Acoustique — Mesurage de l'isolation acoustique des immeubles et des
éléments de construction —
Partie 14: Lignes directrices pour des situations particulières in situ
Reference number
ISO 140-14:2004(E)
ISO 2004
---------------------- Page: 5 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2004

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2004 – All rights reserved
---------------------- Page: 6 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope...................................................................................................................................................... 1

2 Normative references........................................................................................................................... 1

3 Technical background.......................................................................................................................... 1

4 Test report.............................................................................................................................................. 2

5 Annexes................................................................................................................................................. 3

Annex A (informative) Airborne sound insulation........................................................................................... 4

Annex B (informative) Impact sound insulation............................................................................................ 13

Annex C (informative) Diagrammatic sketches ............................................................................................. 17

Annex D (informative) Combinations of tapping machine positions and microphone positions............ 29

Annex E (informative) Explanation of terms .................................................................................................. 30

Bibliography ..................................................................................................................................................... 31

© ISO 2004 – All rights reserved iii
---------------------- Page: 7 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 140-14 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building

acoustics.

ISO 140 consists of the following parts, under the general title Acoustics — Measurement of sound insulation

in buildings and of building elements:

 Part 1: Requirements for laboratory test facilities with suppressed flanking transmission

 Part 2: Determination, verification and application of precision data

 Part 3: Laboratory measurements of airborne sound insulation of building elements

 Part 4: Field measurements of airborne sound insulation between rooms

 Part 5: Field measurements of airborne sound insulation of façade elements and façades

 Part 6: Laboratory measurements of impact sound insulation of floors
 Part 7: Field measurements of impact sound insulation of floors

 Part 8: Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a

heavyweight standard floor

 Part 9: Laboratory measurements of room-to-room airborne sound insulation of a suspended ceiling with

a plenum above it

 Part 10: Laboratory measurement of airborne sound insulation of small building elements

 Part 11: Laboratory measurements of the reduction of transmitted impact sound by floor coverings on

lightweight reference floors

 Part 12: Laboratory measurement of room-to-room airborne and impact sound insulation of an access

floor
 Part 13: Guidelines (Technical Report)
 Part 14: Guidelines for special situations in the field
iv © ISO 2004 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 140-14:2005
INTERNATIONAL STANDARD ISO 140-14:2004(E)
Acoustics — Measurement of sound insulation in buildings and
of building elements —
Part 14:
Guidelines for special situations in the field
1 Scope

This part of ISO 140 concerns field measurements of airborne sound insulation and impact sound insulation,

and is to be used as a supplement to ISO 140-4 and ISO 140-7. It contains guidelines on sound insulation

measurements in special situations in the field not directly covered by ISO 140-4 and ISO 140-7.

NOTE The basic standards ISO 140-4 and ISO 140-7 specify the measurement procedure in detail under ideal

conditions, but give only little information on how to establish a suitable measurement set-up in rooms differing from

simple box-shaped rooms of normal living room size. When it comes to very large rooms, long and narrow rooms,

staircases, coupled rooms, etc., no guidance is given in the basic standards, which is why the guidelines in this part of

ISO 140 have been prepared. Use of the guidelines will contribute to improvement in the reproducibility of building

acoustics field measurements and, furthermore, facilitate the performance of measurements by avoiding time-consuming

considerations in actual measurement situations.

This part of ISO 140 is primarily applicable to measurements in rooms in dwellings, schools, hotels, etc., with

volumes less than 250 m .

It is not mandatory to use these guidelines in connection with measurements according to ISO 140-4 and

ISO 140-7 unless this is stated elsewhere.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 140-4:1998, Acoustics — Measurement of sound insulation in buildings and of building elements —

Part 4: Field measurements of airborne sound insulation between rooms

ISO 140-7:1998, Acoustics — Measurement of sound insulation in buildings and of building elements —

Part 7: Field measurements of impact sound insulation of floors
3 Technical background

The guidelines in this part of ISO 140 are based on the results presented in ISO/TR 140-13. The guidelines

consist of extracts from this Technical Report.

The guidelines have been prepared based on some theoretical considerations, a few experimental

investigations, and on practical experience from performing a great number of field measurements.

© ISO 2004 – All rights reserved 1
---------------------- Page: 9 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)

The principle is that examples of suitable measurement set-ups are shown in diagrammatic sketches. Efforts

have been made to present examples (some very realistic and some very unusual) which should permit

selection of an example from which a suitable measurement set-up can be established in nearly all field

situations. The possibility of creating a suitable measurement set-up inspired by the sketches but not fully

identical to any of them is the main reason for presenting the guidelines as informative annexes.

The loudspeaker and microphone positions indicated in the sketches should only be considered as guidance

to show how they should be arranged. All requirements given in ISO 140-4 concerning distances to room

boundaries, displacement of the loudspeakers in relation to the planes parallel to room boundaries, etc., shall

be fulfilled.

Not all the sketches are referred to in the text. Sketches not referred to should be regarded as additional

examples.

Notice that in two situations the guidelines might be in conflict with the basic standards. These situations are

explained as follows.

Situation 1: The method described in ISO 140-4 for measurement of airborne sound insulation presumes

approximately diffuse sound fields in the source room as well as the receiving room. It is required that the

microphone positions be evenly distributed within the entire volume of the rooms.

If, for example, the source room is a very long, narrow corridor with absorbing ceiling and a carpet on the floor,

a considerable sound pressure level decay of 10 dB to 20 dB can occur from one end of the room to the other.

In principle, measurement cannot be performed according to ISO 140-4 because the sound field is not diffuse,

and because averaging the sound pressure level in a room with a considerable sound pressure level decay

has no meaning.

However, often a measurement is needed. In this situation, this part of ISO 140 suggests that the sound

source be placed at a certain maximum distance from the partition common to the source room and the

receiving room, i.e. a “virtual” and limited source room volume is defined in the part of the corridor closest to

the common partition according to these guidelines.

Situation 2: For measurement of impact sound insulation in situations with a large floor area in the source

room, a discrepancy can be observed between results obtained according to this part of ISO 140 and the

basic standard. According to this part of ISO 140, the tapping machine should not be placed too far away from

the receiving room. This will in some situations lead to a higher sound pressure level in the receiving room

than obtained according to ISO 140-7, where it is stated that the tapping machine positions shall be distributed

over the total floor area in the source room.
4 Test report

ISO 140-4 and ISO 140-7 specify what information shall be included in the test report. If the guidelines in this

part of ISO 140 have been used, this should be mentioned under the item “Brief description of details of

procedure and equipment” in ISO 140-4:1998, Clause 9, item i), and in ISO 140-7:1998, Clause 8, item h). A

short description of the applied measurement procedure should be given. Any deviation from the requirements

in ISO 140-4 or ISO 140-7 should be reported.
2 © ISO 2004 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)
5 Annexes

This part of ISO 140 has two different application areas: airborne sound insulation and impact sound

insulation. In order to facilitate practical application, the guidelines are laid down in separate annexes, with

examples of suitable measurement arrangements in the form of diagrammatic sketches, and also graphical

explanations and tabulated figures. The informative annexes are the following:
 Annex A: Airborne sound insulation
 Annex B: Impact sound insulation
 Annex C: Diagrammatic sketches
 Annex D: Combinations of tapping machine positions and microphone positions
 Annex E: Explanation of terms.
© ISO 2004 – All rights reserved 3
---------------------- Page: 11 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)
Annex A
(informative)
Airborne sound insulation
A.1 General
This annex is a supplement to ISO 140-4.

That part of the separating partition common to both the source and receiving rooms is named the “common

partition”. The total surface of the separating partition is named the “partition” for both horizontal and vertical

measurements. (See Annex E for an explanation of these terms.)
A.2 Principles
A.2.1 Frequency range of measurement

The sound reduction index should be measured using one-third-octave band filters in a frequency range of at

least 100 Hz to 3 150 Hz.

These guidelines have been prepared for use in the frequency range 100 Hz to 3 150 Hz. However, the basic

principles of the guidelines may also be used for measurements in the frequency range 50 Hz to 80 Hz

according to ISO 140-4:1998, Annex D, and in the frequency range 4 000 Hz to 5 000 Hz.

These guidelines are applicable to measurements in one-third-octave bands as well as in octave bands.

A.2.2 Room conditions

The room volumes should not exceed 250 m . However, the guidelines may also be useful for measurements

between rooms not fulfilling this limitation.

For horizontal measurements carried out in one direction only, the largest room is usually chosen to be the

source room. However, if one of the rooms is regular with a well-defined volume while the other has a

complicated geometry, the well-defined room should be used as the receiving room, even if it is the larger of

the two rooms.

NOTE According to ISO 140-4, alternatively two measurements can be carried out in opposite directions and finally

be averaged. However, measurements in two directions are quite time-consuming because two complete measurement

set-ups are needed and the reverberation time has to be measured twice.

For vertical measurements, the lower room should preferably be used as the source room. The upper room

may be the source room provided that an omnidirectional loudspeaker is used, situated at a sufficient distance

above the floor to prevent incidence of direct sound. Preferably, the stand carrying the loudspeaker should be

placed on soft material to prevent structure-borne sound entering into the floor.

When calculating the sound reduction index, the volume of the receiving room and the area of the common

partition are needed. The volumes of objects in the receiving room with closed non-absorbing surfaces, such

as wardrobes, cabinets and installation shafts, are subtracted from the total volume of the receiving room. The

area of the common partition will not be reduced if fixed cabinets, wardrobes, etc., are covering a part of the

common partition.
4 © ISO 2004 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)
A.2.3 Number of microphone and loudspeaker positions

The recommended number of microphone and loudspeaker positions in the source and receiving room is

stated in Table A.1.

Table A.1 — Number of microphone and loudspeaker positions determined from the floor area of the

source and receiving room
Number of loudspeaker and microphone positions
Measurement set-up
Floor area of the room Loudspeakers
Rotating
Fixed microphones
microphones
m (source room only)
A < 50 2 5 (10) 1 (2)
B 50 to 100 2 10 (10) 2 (2)
C > 100 3 15 (15) 3 (3)

NOTE The numbers in parentheses are the total numbers of sound pressure level measurements to be carried out in the room.

If the floor area is less than 50 m and the distance between the two loudspeaker positions is at least 1,4 m as

required in ISO 140-4, the same five microphone positions or the same path of a rotating microphone may be

used for both loudspeakers (measurement set-up A). If the requirements in ISO 140-4 concerning the distance

between loudspeaker positions cannot be fulfilled, measurement set-up B should be used.

2 2

Two loudspeaker positions should be used in rooms with floor areas in the range 50 m to 100 m . The same five

fixed microphone positions or the same position of the rotating microphone should not be used for both

loudspeakers. This means that a total of ten fixed microphone positions or two positions of a rotating microphone

are required (measurement set-up B).

To achieve the highest obtainable accuracy under all measurement conditions, it is generally recommended to

use measurement set-up B also for rooms with floor area less than 50 m . This is especially relevant for oblong or

angular rooms.

If the floor area exceeds 100 m , it is recommended to use three loudspeaker positions, 15 fixed microphone

positions or, alternatively, three positions of a rotating microphone.

As stated in ISO 140-4, in the source and receiving rooms, fixed microphone positions shall be evenly

distributed within the space permitted, and in the case of a rotating microphone the position(s) shall be chosen

to cover the entire room volume as far as possible.

In small rooms with volumes less than 10 m , a maximum number of uncorrelated microphone positions are

obtained by the use of fixed microphone positions.
A.2.4 Horizontal measurements

Examples of suitable loudspeaker and microphone positions for horizontal measurements are shown in

Annex C, Examples 1 to 14 (for symbols, see C.2).

The loudspeaker positions are normally chosen to be as close as possible, considering the minimum

distances stated in ISO 140-4, to the two corners at the back wall of the source room opposite the common

partition. For source rooms with a floor area exceeding 50 m , the loudspeakers should not be placed at a

distance from the common partition exceeding 10 m or 2,5 times the width of the partition in the source room.

The criterion of the two giving the shortest distance is chosen. (See Annex C, Examples 1, 2 and 3.) If the

source room floor area is limited (see Example 2), the limited area is used when selecting the number of

loudspeaker and microphone positions from Table A.1.
© ISO 2004 – All rights reserved 5
---------------------- Page: 13 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)

If the sound transmission is dominated by transmission through a flanking wall or a flanking façade, the

loudspeaker should not be placed close to such a building element.
A.2.5 Vertical measurements

Examples of suitable loudspeaker and microphone positions for vertical measurements are shown in Annex C,

Examples 15 to 28 (for symbols, see C.2).

The loudspeaker positions are normally chosen to be as close as possible to the corners of the room,

considering the minimum distance stated in ISO 140-4.

If the sound transmission is dominated by transmission through a flanking wall or a flanking façade, the

loudspeaker should not be placed close to such building elements.

If the receiving room is smaller than the source room, the loudspeakers should be situated in that part of the

source room closest to the common partition if the floor area of the source room exceeds 50 m . (See

Annex C, Examples 21, 23 and 25.)
A.3 Unusual room types
A.3.1 Partly divided rooms

If a room is partly divided by a wall, as a “rule-of-thumb” the room is considered as two individual rooms if the

area of the opening is equal to or less than one-third of the total area of the vertical section of the room in the

plane containing the dividing wall. If the room is considered as one room volume, measurement set-up B

should, if suitable, be used. The loudspeaker positions are situated to “cover” the entire area of the common

partition as completely as possible. (Preferably the entire common partition should be visible from both

loudspeaker positions.) The principles above are also applicable to room-dividing walls with a height less than

the height of the room.

Examples of horizontal measurements between partly divided rooms are shown in Annex C, Examples 9, 10, 11,

12 and 13.

If one or both rooms for vertical measurements are partly divided by a wall, the same principles as for

horizontal measurements should be used. (See Annex C, Examples 26, 27, 28, 30 and 31.)

Preferably, an opening between two coupled rooms should always be totally covered by sheets of, for

example, plywood or gypsum board to achieve well-defined rooms.
A.3.2 Damped rooms

In large, strongly damped rooms (rooms with a short reverberation time), the sound pressure level can

decrease considerably with increased distance to a sound source.
EXAMPLE A long, narrow corridor with absorbing ceiling and carpet on the floor.

In strongly damped receiving rooms, it may be necessary to limit the part of the receiving room volume in

which the sound pressure level is sampled. Parts of the receiving room where the sound pressure level is

6 dB or more below the level in the part of the room closest to the common partition should be omitted. For

horizontal measurements, a reference measurement position is chosen 0,5 m from the middle of the common

partition and 1,5 m above floor level. For vertical measurements, a reference measurement position is chosen

1,5 m above the middle of the common partition. (See explanation of terms in Annex E.)

With the loudspeaker in the source room switched on, the sound pressure level decay may be estimated by

measuring the A-weighted sound pressure level in the reference position and in positions with increasing

distance to this. A hand-held sound level meter may be used. The limited receiving room volume is used for

the measurement as well as for the calculation of the sound reduction index.
6 © ISO 2004 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 140-14:2005
ISO 140-14:2004(E)

In strongly damped source rooms, the sound pressure level decay from a position 1 m in front of the sound

source to a position 0,5 m in front of common partition should not exceed 6 dB. If this is the case, the

loudspeaker should be moved closer to the common partition.
A.3.3 Staggered rooms

If the rooms are staggered and the floor area of the source room exceeds 50 m , the loudspeakers should be

situated in that part of the source room closest to the common partition. For vertical measurements, the

loudspeakers should not be placed at a distance from the back wall (see Annex E) of the source room

exceeding 2,5 times the width of the source room, or 10 m. The criterion of the two giving the shorter distance

is chosen. (See Annex C, Examples 17, 21 and 23.)

If the width of the common partition for horizontal measurements is less than half the width of the partition in

the source room, the distance between the loudspeaker positions should be reduced to approximately

2,5 times the width of the common partition (this is relevant if the receiving room is much smaller than the

source room, or if the rooms are staggered). The positions are chosen in that part of the room closest to the

common partition. The distance should not be reduced to less than 5 m. (See Annex C, Examples 4 and 5.)

Loudspeaker positions on the symmetrical lines of the room should be avoided. If the rooms are completely

staggered (no common partition), the distance between the loudspeakers should not be reduced. (See

Annex C, Example 6.)
Examples of vertical measurements are shown in Annex C, Examples 17, 18 and 19.
A.3.4 Extremely complicated room geometry

No detailed guidelines can be stated for measurements between rooms with extremely complicated room

geometry. An example is measurement between open-planned, split-level dwellings, each consisting of

...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.