I have very less idea about these stuff but Im pretty certain that a power amp should not have any volume control. The source also should not have any volume control. Volume should only be controlled from preamp , also the gain.
Buffer is not always necessary unless your components are a bit vintage or you have some tube gear.It is a wonderful device to match your source with your power amplifier. It has a volume control and has a unity gain.
Precisely.This is not a simple question and the answer to your question is not simple too. Gain and volume are different animals. Simplistically, gain is a load at the input while volume affects the output. What is the output impedance of your pre? Your manufacturer should be able to tell you that. Based on that, your amp manufacturer should be able to tell you what the ideal gain setting should be kept at the amp.
The volume pot is a resistive element so the more it is opened up the better the sound. So once the gain on the amp is determined and fixed, you don't play around with that any more. You play around with the pre volume and the source volume to determine what is best sounding for YOU!
Edit: I see Joshua beat me to it.
You should also try connecting the source directly to the power amp which I understand has a volume pot in addition to a gain switch. Who knows, you may like a passive preamp better than an active.
What kannan is saying is absolutely correct , the amp volume is to be kept at 100% and the adjustments are to be made on the preamp side and as the preamp can push out 2V it's best to keep the gain at low setting.@vbutani from the specs, I see that the amp has input sensitivity settings of 0.5 V and 1.5V.
The volume control on this power amp it is only an attenuator, to be used only if you do not have a dedicated preamp.
Since you have a dedicated preamp, set it to full (no brainer here).
Of course put the digital output full on your LG source aswell.
Try both 0.5 and 1.5 volt sensitivity on the power amp.
Go with the sensitivity that offers a wider bandwidth on the volume pot of the preamp. I guess with modern DACs pushing out 2 volts, 0.5 should be good enough on the power amp, but try both settings
Keeping the volume at 100% is essentially Bypassing the attenuator , because the center leg of the potentiometer touches the other end when it's at 100% there by essentially Bypassing it.@vbutani Please check the possibility with @adas Aniket and see if the attenutor on the power amp can be bypassed. In my opinion you will benefot from it if you are using a dedicated preamp.
It is just a matter of couple wires that you need to desolder and rewire to take the potentiometer from the circuit.
I was using power amp directly connected to source and it sounds good.You should also try connecting the source directly to the power amp which I understand has a volume pot in addition to a gain switch. Who knows, you may like a passive preamp better than an active.
Thankyou...I recently bought Swara tube preamp and O&B audio SS2150 A/B power amp and trying different combinations of volume levels in all the devices. My setup: LG G8x Mobile to play FLAC/Apple lossless files >> Swara tube preamp >> O&B Power amp >> Dali Blue 6006 Floorstanding speakers I observed that...www.hifivision.com