2. amps-preamps
  3. 188287-99185

Amp, Preamp, two volume pots, there can be only one!

Hello everybody,

I have a question regarding the two volume knobs in my system and how they

should co-relate.

Here is my gear, both units are tubed:

Amp: Coincident Dynamo 34SE Mk1 (Output power: 8Wpc, Sensitivity: 300mV for full output, Input impedance: 100k ohms, S/N ratio: 92dB)

Preamp: Doge 8 2018 (Output impedance: 600 ohms, Input impedance: 50K ohms, Input sensitivity: 200mV)

Speaker: Proac 140 Mk1 (Sensitivity 91db, Amplifier Power Range 15 - 250 watts)

Now here is the dilemma, Coincident says if Dynamo is used a power amp the volume pot should be left open (heard that some call it a sensitivity pot too) but this introduces noise in the system (albeit when music is not playing) and leaves a very small usable range on the preamp volume knob, and hard to hit the sweet spot as at 9 o clock its already very loud.

So what would be the best way to run things without losing signal quality? And is there any mismatch between my power/pre?

Thanks in advance for any suggestions!

neverlast

Showing 1 response by mashif

mashif
106 posts
 

I solved that problem with a Schiit Kara preamp, but any good quality passive preamp will work. I simply run the output of my Microzotl pre into an input. In passive mode the volume control acts as an inline attenuator. I set mine about 2 o'clock which gives me enough room on my preamp volume control. It sounds better than the attenuator on my power amp. And it's easy to open the Kara full and essentially remove it from the chain. 

An added bonus is conveniently switching to the SS mode of the Kara for casual listening. 

More to discover