Class D amplification allows the design of compact very high power amplifiers with a high efficiency. Those amplifiers are an excellent candidate for being used in compact high powered subwoofers. The drawback of compact subwoofers is the non-linear compression of the air inside the (acoustically) small box. 4th order systems are beneficial over second order systems due to their increased efficiency. To combine the best of both worlds, 4th order design and acoustically small enclosures, a feedback mechanism has been developed to reduce the non-linear distortion found in compact high-powered subwoofers. Acceleration feedback on woofer systems is traditionally used in 2nd order systems. This paper discusses the use of an acceleration and velocity feedback system applied to a 4th order system.
Authors:
Willems, Stefan; D’Hoogh, Guido
Affiliation:
Denon & Marantz Holding, Premiun Sound Solutions, Leuven, Belgium
AES Convention:
126 (May 2009)
Paper Number:
7683
Publication Date:
May 1, 2009
Subject:
Loudspeakers
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.