Spectron musician VS. Pass Labs Amp

Audioconnection,
How do you know that my Pass X350.5 and X600.5 bass response were sluggish bass causing non desirable outcome ?

Because when you wrote
(( My preamps are BAT 51SE and NAT Audio Symmetrical, both are tube pre))
loading down a tube pre is going to hurt your perception to everything not only bass.
Cheers Johnnyr

Hello Audioconnection,

In principle, you are correct: tube preamp have relatively high output impedances and most ss amps have relatively low input impedances and matching such would result , again in principle, in some losses at top and bottom

Now to specific componenents in question: I believe that output impedance of BAT VK51SE is (much?)less then 1000 Ohms (VK does not like tube buffer). In such a case the ratio of input/output impedances would be at least 15:1 which is more then sufficient for good match as it would cut bandwidth by 5-6 percent only. Moreover, I presume PASS amp is wide bandwidth amplifier and then it would be simply inaudible.

I own Spectron, another ss amp, and I have tried many tube preamps with it including fantastic Rex by BAT. Today, I have Joule-Electra LA-300ME and its the match made in heaven.... WE can and may be should match the best tube preamps with best ss amps, I firmly believe

All The Best

I also ended up with a Joule-Electra preamp and Spectron monoblock amps. Best sound in my system of what I have tried. Pass amps were on my short list to try until I figured out how much heat they give off. I live in Texas and heat is a real issue. In August when I had my tube monoblocks I did not play them. My AC could not keep my house cool with the tube amps running.

@Genkides, you should try the PASS amp then. XA-30.5 can grip the woofers of Focal 1037BE speakers like no other. I did have lean bass syndrome with earlier X series. XA-.5 series in a completely different league. I haven't heard Spectron amps however.