CEA-2010-2006.pdf
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1、 ANSI/CEA Standard Standard Method of Measurement for Powered Subwoofers ANSI/CEA-2010 November 2006 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:46:02 MDTNo reproduction or networ
2、king permitted without license from IHS -,-,- NOTICE CEA Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assist
3、ing the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or nonmember of CEA from manufacturing or selling products not conforming t
4、o such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard is to be used either domestically or internationally. Standards, Bulle
5、tins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or
6、other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC document can be made. This Standard
7、 does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use.
8、(Formulated under the cognizance of the CEAs R3 Audio Systems Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2002 Technology 60 East 42nd Street, Room 2520, New York, New York 10165-2520, USA; Tel: +1 212 661 8528; Fax: +1 212 682 0477; Internet: http:/www.aes.org. 1 Copyright Consumer El
9、ectronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:46:02 MDTNo reproduction or networking permitted without license from IHS -,-,- 2.2 Definitions Powered Subwoofer A subwoofer that includes an integrated po
10、wer amplifier. Sound Pressure Level The acoustic pressure measured one meter from the device under test (DUT), or measured at a different distance and mathematically converted to an equivalent value for a one-meter free field measurement distance. Subwoofer A speaker designed to reproduce all or a p
11、ortion of the audio signals below 120 Hertz (Hz). 2.3 Symbols and Abbreviations dB Decibels DUT Device Under Test HD+N Harmonic Distortion and Noise Hz Hertz kHz Kilohertz LF Low Frequency LFCS Low Frequency Calibration Source RCF Room Correction Factor RMS Root Mean Square SPL Sound Pressure Level
12、V Volts 2.4 Compliance Notation As used in this document “shall” and “must” denote mandatory provisions of the standard. “Should” denotes a provision that is recommended but not mandatory. “May” denotes a feature whose presence does not preclude compliance, and implementation of which is optional. “
13、Optional” denotes items that may or may not be present in a compliant device. 3 Standard Test Conditions CAUTION WEAR EAR PROTECTION! High sound levels can cause hearing damage with prolonged exposure. The operator is advised to wear appropriate protection such as ear plugs, preferably balanced atte
14、nuation devices which will still permit the operator to listen critically for distortion or other signs of distress in the device under test. During testing the DUT shall be operated as per manufacturers instructions. Complete systems shall be tested intact. Testing shall be conducted at an ambient
15、temperature of 22 C 5 C and relative humidity of 30% to 80%. The line voltage used to power the DUT shall be within 1% of the nominal value specified for use by the DUT (i.e. for a DUT that requires 120 V, the line voltage used shall be between 118.8 V and 121.2 V). If a crossover or filter network
16、is specified by the manufacturer, it shall be installed according to the manufacturers instructions. All test equipment shall be properly calibrated, and its calibration shall be documented. 2 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/11
17、11111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:46:02 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 Test Procedures The purpose of the tests described in this standard is to provide data that will help the consumer understand how loud in volume, and how low in
18、 frequency, the DUT is capable of operating with acceptable frequency response, noise and distortion. 4.1 Determining Maximum SPL Output This test may be conducted in a calibrated anechoic chamber, in a suitable ground plane environment or in a large calibrated room. The DUT shall be tested at the f
19、ollowing frequencies: 20, 25, 31.5, 40, 50 and 63 Hz. This represents 1/3rd octave spacing. With the input of the DUT connected to the preamplifier, or with its input shorted to ground, and without any input signal presented to the DUT, its volume control shall be set to the maximum position and the
20、 sound pressure level from the DUT and the background noise of the environment and test equipment shall be measured. If the smoothed root mean square (RMS) slow sound pressure level (SPL) (i.e., the RMS SPL determined using a slow integration time and then 1/12 octave smoothed) exceeds 50 dB (flat/u
21、nweighted) at any test frequency (even though no input signal is present) the DUT, test environment and equipment does not comply with CEA-2010, and the reporting method described in section 5 shall not be used for the DUT. Also, no reporting method that might be confused with the reporting method d
22、escribed in section 5 shall be used for the DUT. For each test frequency, a 1/3rd octave band limited tone burst centered at the test frequency shall be fed to the DUT. SPL at the tone-burst test frequency Fo (fundamental) and over the frequency range bounded by 1.26*Fo and 10.0 kHz, where harmonic
23、(and non-harmonic) distortion and noise (HD+N) occurs, shall be monitored. The signal level presented to the DUT shall be increased until the peak SPL of a 1/12 octave smoothed individual component of HD+N exceeds the level specified in Table 1 and illustrated in Figure 1. The signal level presented
24、 to the DUT shall then be decreased to just below the occurrence of the above set of conditions. The peak SPL of the fundamental 3 Hz shall then be recorded. That is, the peak SPL is the highest SPL within the range bounded by 3 Hz below and 3 Hz above the fundamental. This SPL shall be referenced t
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