Bass leaves after amp warms up?

My comments about the CDR420 also apply to the CD300. Looks like it has a front panel switch that selects between ALC, Manual, and Limiter. It should be set to manual, and the recording level set such that its volume meter never gets near the 0 db full scale reference point during any of the recordings. On the other hand, if you set the recording level too low, then noise levels will increase, relative to signal levels, which is why I suggested allowing a margin of perhaps 6 db or so, relative to the 0 db reference point.

Regards,
-- Al

Yes I see those parameters
I will record them again

Fishing, when you left the amp on did you stop the music or leave it playing? Some amps do not get warmed up or stay warm unless they are playing music.

Just trying to totally eliminate "warmed up" as the cause.

After the sound drops out I leave the amp on w/o music playing.
I Return after an hr.or the next morning
Generaly the sound has improved by then-
For another brief listening session

I suspect quantitative analysis of recordings of the system will be inconclusive at best do to difficulty of assuring all parameters that went into the recording. But ya never know...

I'm willing to bet the new MF amp will do much better. IF dynamics and bass is what OP is missing when listening, as best I can tell that amp should do it from what I read, and I would expect OP to hear better results in those regards and overall.

Although specs or bench measurements into 4 ohms would be re-assuring, advertised current delivery capability and verbal claim in MF literature to be able to drive more challenging speaker loads sounds promising.

I had MF A3CR amp prior to current BEl Canto Ref1000ms. They seemed up to the task of handling my larger more difficult load speakers, OHM 5 series 3s. These are a challenge but possibly not as much so as the OPs PSBs from what I read. THe OPs new trial amps would appear to be significantly beefier than the A3CR on paper in regards to both power output and current delivery, a good omen.

We'll see....