AES E-Library

AES E-Library

Refinements in the Impulse Testing of Loudspeakers

Document Thumbnail

The evaluation of a loudspeaker's transfer function or frequency response (amplitude and phase) via digital processing of its measured impulse response is now an established technique. During 10 years' experience with the method, many practical problems of measuring accuracy were encountered. The causes and suggested remedies for reducing measuring errors are discussed, in particular at low frequencies, due to drive unit nonlinearities, signal avceraging in the presence of both random and synchronous background noise, and dc offset in the analog-to-digital converter. In addition, a novel method for accurately determining the free-field response of a loudspeaker system down to very low frequencies is presented. It is shown that by using this method it is possible to estimate a loudspeaker's frequency response to an accuracy of better than 1 dB down to 20 Hz using only 10 ms of its impulse response measured in a nonanechoic environment.

JAES Volume 33 Issue 3 pp. 133-140; March 1985
Publication Date:

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!

AES - Audio Engineering Society