IEC 61305-5:2003

IEC 61305-5 ®
Edition 1.0 2003-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household high-fidelity audio equipment and systems – Methods of measuring
and specifying the performance –
Part 5: Loudspeakers
Equipements et systèmes audio grand public haute fidélité – Méthodes pour
mesurer et spécifier les performances –
Partie 5: Haut-parleurs
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IEC 61305-5 ®
Edition 1.0 2003-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household high-fidelity audio equipment and systems – Methods of measuring

and specifying the performance –

Part 5: Loudspeakers
Equipements et systèmes audio grand public haute fidélité – Méthodes pour

mesurer et spécifier les performances –

Partie 5: Haut-parleurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX E
ICS 33.160.50 ISBN 978-2-8322 0776-5

– 2 – 61305-5  IEC:2003
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
HOUSEHOLD HIGH-FIDELITY AUDIO EQUIPMENT AND SYSTEMS –
METHODS OF MEASURING AND SPECIFYING THE PERFORMANCE –

Part 5: Loudspeakers
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
national Standard IEC 61305-5 has been prepared by IEC technical committee 100: Audio,
video and multimedia systems and equipment.
This bilingual version (2013-07) corresponds to the monolingual English version, published in
2003-05.
The text of this standard is based on the following documents:
FDIS Report on voting
100/651/FDIS 100/678/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61305 consists of the following parts under the general title Household high-fidelity audio
equipment and systems – Methods of measuring and specifying the performance:
Part 1: General
Part 2: FM radio tuners
Part 3: Amplifiers
61305-5  IEC:2003 – 3 –
Part 5: Loudspeakers
This standard is Part 5 of IEC 61305 and specifies methods of measuring and specifying the
performance of loudspeakers.
Part 1 specifies general assumptions to be used to determine the characteristics of the
equipment or system for specification purposes.
Part 2 applies to household high-fidelity radio tuners.
Part 3 applies to household high-fidelity amplifiers.
The committee has decided that the contents of this publication will remain unchanged until
2010. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 61305-5  IEC:2003
HOUSEHOLD HIGH-FIDELITY AUDIO EQUIPMENT AND SYSTEMS –
METHODS OF MEASURING AND SPECIFYING THE PERFORMANCE –

Part 5: Loudspeakers
1 Scope
This part of IEC 61305 specifies methods of measuring and specifying the performance of
loudspeakers. It applies to sound-system loudspeakers for household high-fidelity audio
equipment.
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.
IEC 60268-5, Sound system equipment – Part 5: Loudspeakers
IEC 61305-1, Household high-fidelity audio equipment and systems — Methods of measuring
and specifying the performance – Part 1: General
3 General requirement
Characteristics not otherwise specified more explicitly in this standard shall be in accordance
with IEC 60268-5.
4 Conditions for measurement
The electrical conditions shall be those specified in IEC 60268-5.
The climatic conditions shall be those specified in IEC 61305-1.
5 Test signals and acoustical environment
The test signals and the acoustical environment shall be those specified in IEC 60268-5.
6 Methods of measurement
The characteristics to be specified and the methods of measurement shall be as given in
Table 1.
___________
To be published.
61305-5  IEC:2003 – 5 –
6 Contents of specifications
6.1 Loudspeaker data to be specified in a document available to the user
The specifications shall contain at least information on the characteristics given in Table 1,
item numbers 1, 2, and 4 to 9.
6.2 Loudspeaker data to be labelled on the loudspeaker
The specifications shall contain at least information on the characteristics given in Table 1,
item numbers 2, 7, 8 and 9.
Table 1 – Contents of specifications
Characteristics
Definitions Methods of measurement
to be specified
1. Frequency response under free- Sound pressure level as a function of In accordance with IEC 60268-5:
field conditions frequency, measured under free-field 2003, 21.1.2, paragraph 3
conditions
2. Effective frequency range Frequency range as the range over The effective frequency range can
which the response does not vary by be obtained from the frequency
more than 10 dB response defined in IEC 60268-5:
2003, 21.2.1
3. Frequency response of acoustic Sound power level in 1/3-octave In accordance with IEC 60268-5:
power bands as a function of frequency 2003, 22.1.2
4. Difference of frequency Difference of sound pressure level of In accordance with IEC 60268-5:
responses loudspeakers, which will be used in 2003, 21.1.2, paragraph 3. The
pair mode differences in sound pressure
level are measured in the
effective frequency range defined
in IEC 60268-5:2003, 21.2.1
5. Characteristic sensitivity level Characteristic sensitivity level In accordance with IEC 60268-5:
measured in the effective frequency 2003, 20.4.
range In accordance with Table 1,
number 2.
6. Maximum sound Sound pressure level p(f ) measured Harmonic distortion d is
1 t
pressure level limited at the point where the maximum measured according to
by distortion value of either d or d or d is equal IEC 60268-5:2003, 24.2,
t 2 3
to 10 % referred to f
Intermodulation distortion d and
where
d are measured In accordance
d is the total harmonic distortion;
t
with IEC 60268-5:2003, 24.5
d is the intermodulation distortion of
The frequency f shall be equal to
the 2nd harmonic; and
the lower limit of the effective
frequency range defined in item 2
d is the intermodulation distortion
of Table 1. The frequency f is
of the 3rd harmonic
given by f = 8,5 f
2 1
7. Rated impedance Value of a pure resistance In accordance with IEC 60268-5:
substituting the loudspeaker 2003, 16.1 and 16.2.2
8. Rated noise power Electrical power, calculated by U /R. In accordance with IEC 60268-5:
n
U is the rated noise voltage, R is the 2003, 18.1
n
rated impedance
9. Rated sinusoidal power Electrical power, calculated by U /R. In accordance with IEC 60268-5:
s
U is the rated sinusoidal voltage, R 2003, 18.4
s
is the rated impedance
_____________
– 6 – 61305-5  CEI:2003
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
_____________
ÉQUIPEMENTS ET SYSTÈMES AUDIO GRAND PUBLIC HAUTE FIDÉLITÉ –
MÉTHODES POUR MESURER ET SPÉCIFIER LES PERFORMANCES –

Partie 5: Haut-parleurs
AVANT-PROPOS
1) La CEI (Commission Électrotechnique Internationale) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
domaines de l'électricité et de l'électronique. A cet effet, la CEI, entre autres activités, publie des Normes
Internationales. Leur élaboration est confiée à des comités d'études, aux travaux desquels tout
...