30w class A amp for Joseph Audio perspective 2?

tiger

how far you need to turn the knob on your amp volume control (12 oclock, 3 oclock etc etc) to get the desired volume playing into your room is a function of how sensitive your low level and amplifier input is to the signal being fed to it (and of course the sensitivity of your speakers) - ideally you would have a good range of adjustment in the middle of the range of the knob (or digital control), but sometimes not

analogy is some cars have a very sensitive gas pedal - you just barely touch it and the car lurches forward ... other cars you have to depress the pedal 40-50% of get good movement... car A is not more powerful than car B... just a more sensitive gas pedal...

yuhengdu_tiger

I went from the Ren. 30/30 while I had SF Amati's (just a tad short on horse power to drive them) to the Ren. Sig. 140's & upgraded the speakers to the SF Stradavari's.
In both cases - I start @ zero feedback & play from there - You'll find the right setting for your taste. 
I would adjust the DAC first - Then play with the feedback on the amp.

@jjss49  Thank you! Makes a lot of sense!

@paladin  Sounds good! Yeah I already found that using lower output level on my DAC makes things sound smoother. Going to play with the feedback on the amp more. Did you ever change the grounding settings between DC/AF/RF? It is very hard for me to adjust it with tubes running hot but I want to know if it is worth trying. 

@ tiger, Do you have gain controls on the back of the amp. What jjss49 said is right. Adjusting the amps in put gain will make the amp, more or less sensitive to in put Voltage, from the preamp output. :-)