RE: Class D Audio modules noisy when bridged to mono - EricSan - Amp/Preamp Asylum

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RE: Class D Audio modules noisy when bridged to mono

In Reply to: Class D Audio modules noisy when bridged to mono posted by islandmandan on April 18, 2017 at 10:48:38:

Hi Dan,

Sorry to hear of your troubles. I had some contact with Tom and ClassDAudio some time ago when my amps were new and I found him to be very responsive. It seems odd to me that you haven't heard from him...

My CDA-254 amps have a very slight hiss to them that disappears when you back off from them more than a foot or two. I never tried bridging them, though. If your Tannoy drivers are high sensitivity and present an 8-ohm load, then I suspect this would be a more pronounced issue. I suspect bridging them would only compound the leading edge spikes that were revealed with square wave testing I performed in the treble region shown on my webpage.

Ultimately, I discontinued using these amps a few years ago. My local power company converted to a TWACS system (two way automated communication system) for automated meter reading. They ping the meters nearly every hour with a 400Hz carrier wave injection into the AC grid. Because the carrier wave is so low in frequency, it is impossible to filter it out. This carrier wave traveled right through the power supply into the amp and then into my speakers EVERY time it happened. It drove me nuts! Neither Tom nor the local power engineer was able to help me, so now I have a set of 4-channel amps laying around collecting dust. This has made me a bit nervous about moving my living room audio setup from Class B to Class D as a number of new receivers are doing now.

Given my measurements, I'm not really surprised by what is happening in your case. Sorry I don't have a solution for you. Do you really NEED to bridge amps to get that much power? Perhaps you can just use a single amp without bridging and see how things turn out...

http://www.facstaff.bucknell.edu/esantane/movies/SurroundAmp (Open in New Window)

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Follow Ups Full Thread

Topic - Class D Audio modules noisy when bridged to mono - islandmandan 10:48:38 04/18/17 (9)

RE: Class D Audio modules noisy when bridged to mono - EricSan 10:05:08 04/25/17 (1)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 11:51:06 04/25/17 (0)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 15:15:33 04/23/17 (2)

RE: Class D Audio modules noisy when bridged to mono - JURB 23:48:05 04/23/17 (1)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 12:52:43 04/24/17 (0)

RE: Class D Audio modules noisy when bridged to mono - JURB 18:04:04 04/22/17 (3)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 15:00:22 04/23/17 (0)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 14:56:05 04/23/17 (0)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 13:22:48 04/23/17 (0)

Follow Ups

RE: Class D Audio modules noisy when bridged to mono - EricSan 10:05:08 04/25/17 (1)

RE: Class D Audio modules noisy when bridged to mono - islandmandan 11:51:06 04/25/17 (0)

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