Audio Systems/MA Audio 689I

Advertisement

Expert: - 12/6/2008


Question
Having an output issue with my M689I amp. Power and Protect lights are cycling on/off constantly. Very little sub output.

Answer
Are you using it in stereo or mono-bridge?  And, what is the impedance of the speaker(s) you have loaded on the amp?

Are you using a power cap?

Have you checked the ground connection to the amp? It must be rock solid and screwed tight to bare metal.

Have you checked the speaker wiring to make sure there is not an accidental short to car chassis?  

Have you checked the speaker(s)?  A shorted voice coil cans cause the problem you are experiencing.

Hope these ideas will help you find the culprit.  My suspicion is either the ground is not a good one or you have a shorted down voice coil in one of the speakers.

Thanks for your question.
C  

Audio Systems

All Answers

Answers by Expert:

Ask Experts

Volunteer

Cleggsan

Expertise

Audio Design Engineer; systems, loudspeakers, cd/dvd players, etc. I am knowledgeable in all high end audio equipment and installations. MAKE SURE YOU GIVE A MAKE AND MODEL NUMBER AND CAR IF IT IS AN AUTO QUESTION. Note: I am getting some who ask good questions that take a lot of time to research but then the questioner fails to read the answer. Please don't ask questions unless you are seriously looking for an answer. If you find an answer to your question otherwise then let me know with your reply. Thank you.

Experience

Have been associated with audio design, standards, testing and component systems for over 40 years.

Organizations
Life Fellow Member of Audio Engineering Society Life Senior Member of Institute of Electronic and Electrical Engineers

Publications
Review technical manuscripts for IEEE Spectrum Write occasionally for high-end audio publications

Education/Credentials
BSEE/MSCS/MBA

Past/Present Clients
Past Employee/advisor to several well known audio products manufacturers

©2012 About.com, a part of The New York Times Company. All rights reserved.