ADCOM GFA 555 Amp Channel Distortion?

So I bought an Adcom GFA 555 today and listened to it at a friends house on some bookshelf speakers and was blown away by how great it sounded. Took amp home hooked it up to my Cornwall's and the right channel sounded like the woofer was blown. I then hooked up a pair of bookshelf's and again they sounded great no distortion on either channel.

Then I realized that it was not a bad channel. What was happening was that when I turned the amp on, both the 15" woofers on each Cornwall literally moved in a full inch and the right speaker sounded distorted likely because the 1" move probably misaligned the voice coil. I thought it was some sort of polarity problem so I reversed the speaker wires on the speaker that was distorting and it caused the woofer to push out 1" and the woofer literally looked like it was about to pop out of the speaker. I then hooked up the bookshelf's and noticed that they indeed had massive woofer moveage.

Does anyone know what would cause this. I know it's something to do with the amp cause my other amp does not make my woofer move in or out just from turning the power on.

I had a guy check the amp and he couldn't figure out what was wrong with it he was perplexed. He stated there was direct current coming off the outputs. He stated everything test great and the only part he had not tested where the two transistors that are lodged in the heat sink. He stated if could be those 2 but he couldn't get to them and didn't really want to spend much time.

He was also thrown by the fact that it was both channels that where bad and he said the probability is very low. I think I'm just going to sale it. He pretty much said he tested everything on the unit. The thermal protection light now comes on since I let him test it as well as the fuses blow for the speakers. He said the negative speaker fuses were blowing and that was odd. He seemed so stumped and ideas on what else he may be able to do to fix this amp.

Who wants to buy it, lol. It sounded great for the 30 minutes I got out of it.

Dishonest everyone on this thread knows the amp has issues what are u talking about.

Anyway amazingly the guy took the amp back and replaced it with another adcom he had of the same model. I'm literally perplexed he allowed me too. I told him that I hooked it up a way I thought it might have caused problems and also that I changed inputs while the unit was on and heard a sound. I told him that I didn't know if it was my fault it died or he sold me something that didn't work.

Because of this I really was just going to take the blame. But after talking to several techs they convinced me that the kind of problems the amp was experience should not have been caused by anything I did as well as people on the forum.

I decided to contact him and ask him would he atleast give me 50 back on the purchase over voicemail cause several people told me that it was likely broke before I bought it. I didn't expect to get a response and he sent a text saying bring it back and he would replace it. He replaced it with another 555 he had with the original box and manual that he was selling for 375 even though the one I bought had no box and he sold to me for 300.

He's either the most honest guy I've ever met in my life or he sold me the amp in questionable condition. I prefer to think he's just an honest guy.

I felt so bad that I wanted to make sure it was not my fault. I hooked new amp up exactly the same way I did befor with speaker selector and receiver as preamps with receiver speaker wire going to speaker selector receiver a input and receiver preamp outs to amp and then to selextor receicer input b and starting switching between. Receiver speaker outs and amp speakers outs to see which sounded better and the amp did not die. So I feel comfortable knowing he sold me a broken amp.

I really do honor this guys integrity cause I called the guy and told him I don't know if I ruined receiver or not. I had taken Ownership and would have swallowed the pill but after having a tech look at it and talking to others they convince me that issues likely existed before I purchased. Hell I only used for 40 minutes. I feel like a lucky guy, but he stated he was sure he could part the amp out and make his money back.

Thanks Roger u along with the 2 techs I spoke with convinced me to see if he would take it back cause I was prepared to just accept I had been screwed. This guy gave me a little more hope in mankind.