I think my speakers are killing my amps.

Hi Chad,

I may be mistaken, memory isn't what it used to be, but if the 4004 is anything like my 3002, I seem to remember there were two internal fuses, one for each channel. Try lifting the lid, and check for them. Like I said, I may be mistaken, but it's worth a try.

Good luck, and regards,
Dan

Thanks but yes it has 5 total fuses and all are fine. Nothing stands out as bad upon visual inspection. It knocked loudly then right channel was gone. Cheers

Sounds like a protection relay. It may be that a device overheated and failed- thus the protection relay kicked in to prevent the amp from destroying the speaker.

Either way it sounds like service is indicated. I would weigh the cost of repair against how the amplifier served your needs; if a replacement amp is costing over just a few hundred dollars then its likely the amp is very well worth repair, assuming service info is available.

you know, planar speakers (electro-static or true ribbon or quasi ribbon) could be a very capacitative load to the power amp. This means that, due to this highly capacitative load, the power amp could break out into ultrasonic oscillations. As a side note: Very recently I contributed to a thread that discussed ultrasonic oscillations - the OP had posted that his Odyssey Audio gear was frying his Green Mtn Audio speakers time & again - you might want to read that thread as well if there is any info worthwhile for you.
The ultrasonic oscillations could have sufficient amplitude thus generate sufficient heat energy to kill your power amp over time.
There's a good reason that InnerSound/Sanders Sound Systems makes their own power amp for their speakers. Not all power amps, no matter how bulky they look, can effectively drive a planar loudspeaker.
Maybe this is not the issue but it's something to keep in mind.....

Hmmm, great info and food for thought. THANKS!
I am going to send the planar line array to VMPS for inspection, I talked to Brian yesterday. My largest concern is it always seams to be right channel thus a inspection of the series/parellel or reverse (I get them confused) is a culprit. 6drivers per side are wired in pairs then those three sets are joined. After that is looked into I will look at my best bet for the amp repair or to replace. Again thanks