Considering A SS amplifier

What are the sources of music you are listening to?  Mostly digital or some analog (vinyl)?  That should be a factor as well.

@neonknight 

I'm using Bob Carver VTA-180 monoblock amplifiers.  Rated for 210 watts.  The mentioned anomaly occurred (or at least noticed) when I had replaced the termination of speaker cables.  The speakers were connected to the 4 ohm outputs on the amplifiers.  Not sure if the break in on the speaker termination exaggerated the issue but when I checked the bias voltage on the amplifiers, I noted fairly violent changes in the bias voltage under normal listening volumes.  I was concerned enough to contact the manufacturer.  I was given some ideas to try to isolate the problem since one of the amps seemed more unstable than the other.

None of the tube swaps or other swaps had any impact on the issue.  I do have some electronics background so while looking at schematics for the amplifier, I decided I may be over thinking the issue and decided to measure the actual resistance of the speaker,  Mine were wired to be able to be bi-amped and have jumpers supplied by Eric (wanted to leave my options open for the future).

I measured again this morning to verify my findings.  My MOABs measure 3.2 ohms.  This is the load seen by the amplifier.  When I checked the manual, it stated to use an output terminal on the amplifier that is less than the load (3.2 ohms).  I moved the speaker wire to the 2 ohm output on the amp and voila, rock steady bias voltage even at high volumes.

IMHO, it seems that the MOABs are efficient.  I love the sound.  I replaced some Cornwall IIIs with the MOABs.  They are sensitive to system changes.  I missed the dynamic sound of the horns so I added some Stein Harmonizers.  Also upgraded to all silver interconnects (thanks @Eric_squires, your posts and suggestions about cable to use led to some nice sounding DIY cables.  Much more transparent than the Audioquest cables I was using).

If I were looking for some SS amplifiers to drive these speakers, I would want to ensure they are capable of efficiently driving low load speakers.

Many tried to pull me over to the tube side as well but what I have learned is that I just prefer the sound of no tubes, just as I don’t prefer the sound of no preamp before the amp. Yes, I can hear how tubes are warmer and certain bright aspects are now smoother, but I found that in turn many of the highs weren’t as clear and the bass was not as fast. This was in my comparison of the rogue rh-5 and the headamp gs-x mini to my susvara. I much prefer the SS

The 4365's deserve big honkin solid state amps IMO. Just for giggles, you could buy one of the high powered Crown amps off Amazon on the cheap and see if that is more your taste. Then you can go after a higher end that is similar. I'm thinking one of the Passlabs or McIntosh SS big powered amps would be a great match.

Cabling is the bane of my existence! Last night I took the time to reinstall the VH Audio Spectrum CU interconnects within the system, and results were positive. This morning I reinstalled the Siemens 6922 pre driver tubes, as the Spectrum are a more forward and vibrant interconnect, and from what I hear the Telefunken can be a bit lean. 

So I spent a bit of time listening this morning, and this is a better balance. I have a love/hate relationship with wiring in that I hear what it does and it makes contributions at the finest level can separate the sound from being merely good to excellent. Yet I have a hard time coming to grips with the prices of this stuff, and its not like I got cheap audio gear. Couple that with the reaction any specific wire has within a system is difficult to predict, so it always feels like you are walking blind. There are times these Spectrum cables are so forward that I can't use them in a system, and I have an on and off relationship with them. I have been trying to move past them for what maybe 10 years now? Yet they stay relevant, seem a bit modestly priced, but somehow I always build systems where they work in. Go figure, audio is weird. 

I think I am going to start a conversation with the fellow with the AVM amps as they intrigue me. But right now I can enjoy this amp, it works in this system it seems. Its a crazy hobby isn't it.