IEC 60268-5:2003
(Main)Sound system equipment - Part 5: Loudspeakers
Sound system equipment - Part 5: Loudspeakers
IEC 60268-5:2003 applies to sound system loudspeakers, treated entirely as passive elements. Loudspeakers with built-in amplifiers are excluded. It gives the characteristics to be specified and the relevant methods of measurement for loudspeakers using sinusoidal or specified noise or impulsive signals. This third edition cancels and replaces the second edition published in 1989, amendment 1 (1993) and amendment 2 (1996). It constitutes a technical revision.
This publication is to be read in conjunction with IEC 60268-1:1985 and IEC 60268-2:1987
Equipements pour systèmes électroacoustiques - Partie 5: Haut-parleurs
La CEI 60268-5:2003 s'applique aux haut-parleurs de systèmes électroacoustiques, traités entièrement comme des éléments passifs. Les haut-parleurs avec amplificateurs incorporés sont exclus. Elle indique les caractéristiques à spécifier et les méthodes de mesure appropriées pour les haut-parleurs, utilisant des signaux sinusoïdaux, de bruit spécifié ou impulsionnels. Cette troisième édition annule et remplace la deuxième édition parue en 1989, l'amendement 1 (1993) et l'amendement 2 (1996). Elle constitue une révision technique.
Cette publication doit être lue conjointement avec la CEI 60268-1:1985 et la CEI 60268-2:1987.
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INTERNATIONAL IEC
STANDARD
60268-5
Third edition
2003-05
Sound system equipment –
Part 5:
Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5:
Haut-parleurs
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD
60268-5
Third edition
2003-05
Sound system equipment –
Part 5:
Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5:
Haut-parleurs
IEC 2003 Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
X
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
– 2 – 60268-5 IEC:2003(E)
CONTENTS
FOREWORD . 5
1 Scope . 6
2 Normative references. 6
3 Conditions for measurement . 7
3.1 General conditions. 7
3.2 Measuring conditions. 7
4 Test signals . 8
4.1 General . 8
4.2 Sinusoidal signal . 8
4.3 Broadband noise signal . 8
4.4 Narrow-band noise signal . 8
4.5 Impulsive signal. 8
5 Acoustical environment. 8
5.1 General . 8
5.2 Free-field conditions . 8
5.3 Half-space free-field conditions. 9
5.4 Diffuse sound field conditions . 9
5.5 Simulated free-field conditions. 9
5.6 Half-space simulated free-field conditions. 9
6 Unwanted acoustical and electrical noise. 9
7 Positioning of loudspeaker and measuring microphone.10
7.1 Measuring distance under free-field and half-space free-field conditions.10
7.2 Positioning of loudspeaker in diffuse field conditions .10
7.3 Positioning of loudspeaker and microphone in simulated free-field conditions.10
8 Measuring equipment.11
9 Accuracy of the acoustical measurement .11
10 Mounting of loudspeakers .11
10.1 Mounting and acoustic loading of drive units.11
10.2 Mounting and acoustic loading of a loudspeaker system .11
11 Standard baffle and measuring enclosures .11
11.1 Standard baffle .11
11.2 Standard measuring enclosures.12
12 Preconditioning.13
13 Type description .13
13.1 General .13
13.2 Loudspeaker drive units.13
13.3 Loudspeaker system.13
14 Marking of terminals and controls .13
15 Reference plane, reference point and reference axis .13
15.1 Reference plane – characteristic to be specified .13
15.2 Reference point – characteristic to be specified.14
15.3 Reference axis – characteristic to be specified .14
16 Impedance and derivative characteristics.14
16.1 Rated impedance – characteristic to be specified .14
60268-5 IEC:2003(E) – 3 –
16.2 Impedance curve .14
16.3 Total Q-factor (Q ) .14
t
16.4 Equivalent air volume of a loudspeaker drive unit compliance (V ) .16
as
17 Input voltage.17
17.1 Rated noise voltage.17
17.2 Short-term maximum input voltage.18
17.3 Long-term maximum input voltage .18
17.4 Rated sinusoidal voltage.19
18 Input electrical power.19
18.1 Rated noise power – characteristic to be specified.19
18.2 Short-term maximum power – characteristic to be specified.19
18.3 Long-term maximum power – characteristic to be specified .19
18.4 Rated sinusoidal power – characteristic to be specified .19
19 Frequency characteristics .20
19.1 Rated frequency range – characteristic to be specified .20
19.2 Resonance frequency .20
19.3 Tuning frequency of a bass reflex or passive radiator loudspeaker system –
characteristic to be specified .20
20 Sound pressure under free-field and half-space free-field conditions .20
20.1 Sound pressure in a stated frequency band .20
20.2 Sound pressure level in a stated frequency band – characteristic
to be specified .21
20.3 Characteristic sensitivity in a stated frequency band.21
20.4 Characteristic sensitivity level in a stated frequency band – characteristic
to be specified .21
20.5 Mean sound pressure in a stated frequency band .21
20.6 Mean sound pressure level in a stated frequency band –
characteristic to be specified .22
21 Response under free-field and half-space free-field conditions .22
21.1 Frequency response .22
21.2 Effective frequency range .23
21.3 Transfer function .23
22 Output power (acoustic power) .24
22.1 Acoustic power in a frequency band.24
22.2 Mean acoustic power in a frequency band .25
22.3 Efficiency in a frequency band .26
22.4 Mean efficiency in a frequency band.26
23 Directional characteristics.26
23.1 Directional response pattern .26
23.2 Radiation angle .27
23.3 Directivity index .27
23.4 Coverage angle or angles .28
24 Amplitude non-linearity .29
24.1 Total harmonic distortion .29
th
24.2 Harmonic distortion of the n order (where n = 2 or n = 3) .31
24.3 Characteristic harmonic distortion.32
th
24.4 Modulation distortion of the n order (where n = 2 or n = 3).32
th
24.5 Characteristic modulation distortion of the n order (where n = 2 or n = 3) .33
24.6 Difference frequency distortion (of the second order only) .33
– 4 – 60268-5 IEC:2003(E)
25 Rated ambient conditions.34
25.1 Temperature ranges .34
25.2 Humidity ranges.34
26 Stray magnetic fields .35
26.1 Static components .35
26.2 Dynamic components.36
27 Physical characteristics .36
27.1 Dimensions.
...
IEC 60268-5 ®
Edition 3.1 2007-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
Sound system equipment –
Part 5: Loudspeakers
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 IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.
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also once a month by email. Customer Service Centre: csc@iec.ch.
IEC 60268-5 ®
Edition 3.1 2007-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
Sound system equipment –
Part 5: Loudspeakers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.50 ISBN 2-8318-9286-4
– 2 – 60268-5 © IEC:2003+A1:2007(E)
CONTENTS
FOREWORD.5
1 Scope.7
2 Normative references.7
3 Conditions for measurement.8
3.1 General conditions.8
3.2 Measuring conditions.8
4 Test signals.9
4.1 General.9
4.2 Sinusoidal signal.9
4.3 Broadband noise signal.9
4.4 Narrow-band noise signal.9
4.5 Impulsive signal.9
5 Acoustical environment.9
5.1 General.9
5.2 Free-field conditions.10
5.3 Half-space free-field conditions .10
5.4 Diffuse sound field conditions.10
5.5 Simulated free-field conditions .10
5.6 Half-space simulated free-field conditions .11
6 Unwanted acoustical and electrical noise .11
7 Positioning of loudspeaker and measuring microphone.11
7.1 Measuring distance under free-field and half-space free-field conditions .11
7.2 Positioning of loudspeaker in diffuse field conditions .11
7.3 Positioning of loudspeaker and microphone in simulated free-field conditions .12
8 Measuring equipment.12
9 Accuracy of the acoustical measurement.12
10 Mounting of loudspeakers.12
10.1 Mounting and acoustic loading of drive units .12
10.2 Mounting and acoustic loading of a loudspeaker system.13
11 Standard baffle and measuring enclosures .13
11.1 Standard baffle.13
11.2 Standard measuring enclosures.13
12 Preconditioning .14
13 Type description.14
13.1 General.14
13.2 Loudspeaker drive units .14
13.3 Loudspeaker system.14
14 Marking of terminals and controls .15
14.1 General .15
14.2 Positive terminal.15
15 Reference plane, reference point and reference axis .15
15.1 Reference plane – characteristic to be specified.15
15.2 Reference point – characteristic to be specified.15
15.3 Reference axis – characteristic to be specified .16
60268-5 © IEC:2003+A1:2007(E) – 3 –
16 Impedance and derivative characteristics .16
16.1 Rated impedance – characteristic to be specified .16
16.2 Impedance curve.16
16.3 Total Q-factor (Q ) .16
t
16.4 Equivalent air volume of a loudspeaker drive unit compliance (V ).18
as
17 Input voltage.19
17.1 Rated noise voltage.19
17.2 Short-term maximum input voltage .20
17.3 Long-term maximum input voltage .20
17.4 Rated sinusoidal voltage.21
18 Input electrical power.21
18.1 Rated noise power – characteristic to be specified .21
18.2 Short-term maximum power – characteristic to be specified .22
18.3 Long-term maximum power – characteristic to be specified .22
18.4 Rated sinusoidal power – characteristic to be specified .22
19 Frequency characteristics.22
19.1 Rated frequency range – characteristic to be specified.22
19.2 Resonance frequency.22
19.3 Tuning frequency of a bass reflex or passive radiator loudspeaker system –
characteristic to be specified .22
20 Sound pressure under free-field and half-space free-field conditions .23
20.1 Sound pressure in a stated frequency band.23
20.2 Sound pressure level in a stated frequency band – characteristic
to be specified.23
20.3 Characteristic sensitivity in a stated frequency band .23
20.4 Characteristic sensitivity level in a stated frequency band – characteristic
to be specified.24
20.5 Mean sound pressure in a stated frequency band.24
20.6 Mean sound pressure level in a stated frequency band –
characteristic to be specified .24
21 Response under free-field and half-space free-field conditions .24
21.1 Frequency response.24
21.2 Effective frequency range.25
21.3 Transfer function.26
22 Output power (acoustic power) .27
22.1 Acoustic power in a frequency band .27
22.2 Mean acoustic power in a frequency band .28
22.3 Efficiency in a frequency band.28
22.4 Mean efficiency in a frequency band.28
23 Directional characteristics.29
23.1 Directional response pattern.29
23.2 Radiation angle.30
23.3 Directivity index.30
23.4 Coverage angle or angles.31
24 Amplitude non-linearity.32
24.1 Total harmonic distortion .32
th
24.2 Harmonic distortion of the n order (where n = 2 or n = 3).33
24.3 Characteristic harmonic distortion .35
– 4 – 60268-5 © IEC:2003+A1:2007(E)
th
24.4 Modulation distortion of the n order (where n = 2 or n = 3).35
th
24.5 Characteristic modulation distortion of the n order (where n = 2 or n = 3) .36
24.6 Difference frequency distortion (of the second order only) .36
25 Rated ambient conditions .37
25.1 Temperature ranges.37
25.2 Humidity ranges.37
26 Stray magnetic fields .37
26.1 Static components.38
26.2 Dynamic components.
...
IEC 60268-5 ®
Edition 3.0 2003-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Sound system equipment –
Part 5: Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5: Haut-parleurs
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 IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les
microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.
IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: csc@iec.ch.
A propos de la CEI
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
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IEC 60268-5 ®
Edition 3.0 2003-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Sound system equipment –
Part 5: Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5: Haut-parleurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 33.160.50 ISBN 978-2-83220-449-8
– 2 – 60268-5 IEC:2003
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Conditions for measurement . 8
3.1 General conditions . 8
3.2 Measuring conditions . 8
4 Test signals . 9
4.1 General . 9
4.2 Sinusoidal signal . 9
4.3 Broadband noise signal . 9
4.4 Narrow-band noise signal . 9
4.5 Impulsive signal . 9
5 Acoustical environment . 9
5.1 General . 9
5.2 Free-field conditions . 9
5.3 Half-space free-field conditions . 10
5.4 Diffuse sound field conditions . 10
5.5 Simulated free-field conditions . 10
5.6 Half-space simulated free-field conditions . 10
6 Unwanted acoustical and electrical noise . 10
7 Positioning of loudspeaker and measuring microphone . 11
7.1 Measuring distance under free-field and half-space free-field conditions . 11
7.2 Positioning of loudspeaker in diffuse field conditions . 11
7.3 Positioning of loudspeaker and microphone in simulated free-field conditions . 11
8 Measuring equipment . 12
9 Accuracy of the acoustical measurement . 12
10 Mounting of loudspeakers . 12
10.1 Mounting and acoustic loading of drive units . 12
10.2 Mounting and acoustic loading of a loudspeaker system . 12
11 Standard baffle and measuring enclosures . 13
11.1 Standard baffle . 13
11.2 Standard measuring enclosures . 13
12 Preconditioning . 14
13 Type description . 14
13.1 General . 14
13.2 Loudspeaker drive units . 14
13.3 Loudspeaker system . 14
14 Marking of terminals and controls . 14
15 Reference plane, reference point and reference axis . 14
15.1 Reference plane – characteristic to be specified . 14
15.2 Reference point – characteristic to be specified . 15
15.3 Reference axis – characteristic to be specified . 15
16 Impedance and derivative characteristics . 15
16.1 Rated impedance – characteristic to be specified . 15
60268-5 IEC:2003 – 3 –
16.2 Impedance curve . 15
16.3 Total Q-factor (Q ) . 16
t
16.4 Equivalent air volume of a loudspeaker drive unit compliance (V ) . 17
as
17 Input voltage . 18
17.1 Rated noise voltage . 18
17.2 Short-term maximum input voltage . 19
17.3 Long-term maximum input voltage . 19
17.4 Rated sinusoidal voltage . 20
18 Input electrical power . 20
18.1 Rated noise power – characteristic to be specified . 20
18.2 Short-term maximum power – characteristic to be specified . 20
18.3 Long-term maximum power – characteristic to be specified . 20
18.4 Rated sinusoidal power – characteristic to be specified . 20
19 Frequency characteristics . 21
19.1 Rated frequency range – characteristic to be specified . 21
19.2 Resonance frequency . 21
19.3 Tuning frequency of a bass reflex or passive radiator loudspeaker system –
characteristic to be specified . 21
20 Sound pressure under free-field and half-space free-field conditions . 21
20.1 Sound pressure in a stated frequency band . 21
20.2 Sound pressure level in a stated frequency band – characteristic
to be specified . 22
20.3 Characteristic sensitivity in a stated frequency band . 22
20.4 Characteristic sensitivity level in a stated frequency band – characteristic
to be specified . 22
20.5 Mean sound pressure in a stated frequency band . 22
20.6 Mean sound pressure level in a stated frequency band –
characteristic to be specified . 23
21 Response under free-field and half-space free-field conditions . 23
21.1 Frequency response . 23
21.2 Effective frequency range . 24
21.3 Transfer function . 24
22 Output power (acoustic power) . 25
22.1 Acoustic power in a frequency band . 25
22.2 Mean acoustic power in a frequency band . 26
22.3 Efficiency in a frequency band .
...
IEC 60268-5 ®
Edition 3.1 2007-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Sound system equipment –
Part 5: Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5: Haut-parleurs
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 IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
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If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
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IEC 60268-5 ®
Edition 3.1 2007-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Sound system equipment –
Part 5: Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5: Haut-parleurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.50 ISBN 2-8318-9286-4
IEC 60268-5 ®
Edition 3.1 2007-09
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Sound system equipment –
Part 5: Loudspeakers
Equipements pour systèmes électroacoustiques –
Partie 5: Haut-parleurs
– 2 – 60268-5 IEC:2003+A1:2007
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Conditions for measurement . 8
3.1 General conditions . 8
3.2 Measuring conditions . 8
4 Test signals . 9
4.1 General . 9
4.2 Sinusoidal signal . 9
4.3 Broadband noise signal . 9
4.4 Narrow-band noise signal . 9
4.5 Impulsive signal . 9
5 Acoustical environment . 9
5.1 General . 9
5.2 Free-field conditions . 9
5.3 Half-space free-field conditions . 10
5.4 Diffuse sound field conditions . 10
5.5 Simulated free-field conditions . 10
5.6 Half-space simulated free-field conditions . 10
6 Unwanted acoustical and electrical noise . 10
7 Positioning of loudspeaker and measuring microphone . 11
7.1 Measuring distance under free-field and half-space free-field conditions . 11
7.2 Positioning of loudspeaker in diffuse field conditions . 11
7.3 Positioning of loudspeaker and microphone in simulated free-field
conditions . 11
8 Measuring equipment . 12
9 Accuracy of the acoustical measurement . 12
10 Mounting of loudspeakers . 12
10.1 Mounting and acoustic loading of drive units . 12
10.2 Mounting and acoustic loading of a loudspeaker system . 12
11 Standard baffle and measuring enclosures . 13
11.1 Standard baffle . 13
11.2 Standard measuring enclosures . 13
12 Preconditioning. 14
13 Type description . 14
13.1 General . 14
13.2 Loudspeaker drive units . 14
13.3 Loudspeaker system . 14
14 Marking of terminals and controls . 14
14.1 General . 14
14.2 Positive terminal . 14
15 Reference plane, reference point and reference axis . 15
15.1 Reference plane – characteristic to be specified . 15
15.2 Reference point – characteristic to be specified . 15
15.3 Reference axis – characteristic to be specified . 15
60268-5 IEC:2003+A1:2007 – 3 –
16 Impedance and derivative characteristics . 15
16.1 Rated impedance – characteristic to be specified . 15
16.2 Impedance curve . 16
16.3 Total Q-factor (Q ) . 16
t
16.4 Equivalent air volume of a loudspeaker drive unit compliance (V ) . 17
as
17 Input voltage . 18
17.1 Rated noise voltage . 18
17.2 Short-term maximum input voltage . 19
17.3 Long-term maximum input voltage . 20
17.4 Rated sinusoidal voltage . 20
18 Input electrical power . 21
18.1 Rated noise power – characteristic to be specified . 21
18.2 Short-term maximum power – characteristic to be specified . 21
18.3 Long-term maximum power – characteristic to be specified . 21
18.4 Rated sinusoidal power – characteristic to be specified. 21
19 Frequency characteristics . 21
19.1 Rated frequency range – characteristic to be specified . 21
19.2 Resonance frequency . 21
19.3 Tuning frequency of a bass reflex or passive radiator loudspeaker system
– characteristic to be specified . 22
20 Sound pressure under free-field and half-space free-field conditions . 22
20.1 Sound pressure in a stated frequency band . 22
20.2 Sound pressure level in a stated frequency band – characteristic
to be specified . 22
20.3 Characteristic sensitivity in a stated frequency band . 23
20.4 Characteristic sensitivity level in a stated frequency band – characteristic
to be specified . 23
20.5 Mean sound pressure in a stated frequency band . 23
20.6 Mean sound pressure level in a stated frequency band –
characteristic to be specified . 23
21 Response under free-field and half-space free-field condit
...
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