help me to understand the gain


I have a problem that the gain is too high. I can only turn the volume knob to 7 o'clock position, with the 0 at 6 o'clock. I am sort of ok when using my computer where I can lower the volume in iTunes. But from my CD player, I cannot.
I am using Maverick Audio DAC, PrimaLuna Progloue 3, McCormack DNA-1, and B&W CDM9NT.

CDM9NT - 90db sensitivity
PrimaLuna - gain 12db(4x), input impedance - 100k Ohm, output impedance - 2800 Ohm
McCormack - input impedance - 100k Ohm, 150Wpc RMS into 8 ohms (21.8dBW)

is that my equipments are out of synergy? I just bought a pair of Zu which is 101db sensitivity, does that mean it will be a even bigger problem? should I buy another preamp with less gain, or should I buy another amp with less power output?
gte357s

Showing 2 responses by gte357s

Wow, thank you very much for all the inputs. It seems all the parameters affects the gain, and it sounds like really my system is lacking synergy. And there is alot of technical stuff that I don't really understand, please excuse me if I ask something stupid.

It seems the gain of the amp is not a published specification. I can only see it inside the Stereophile review under measurement section. How stupid ...

Almarg, thanks for your insight about bass roll off with attenuator. I don't have the engineering background to understand the correlations between impedance and all those stuff, but I will take your words.

I really want to keep the PrimaLuan preamp. I don't have anything technical to back me up, but in my experience, the preamp has a bigger impact to the sound then the amp. And I like how PrimaLuna sound, so, I likely will keep it.

I will try to connect the DAC directly to the amp, but I will missed the PrimaLuna sound.

About the option to lower the gain of McCormack, I think I won't go that path also. It seems I will need to send the amp to Steve, it is kind of a hassle. Also, my new Zu speaker won't need such high current, so, if it is not compatible, I may sell it out and get something else.

As people can see, my Maverick DAC has a volume control as well. So, I can lower my DAC input so I can make the volume know of the preamp within a usable range. This is similar to if I lower the volume in iTunes. My question is, how would this affect the sound? Will I run into the bass roll off problem like using attenuator?

Another option is to get another amp. I would like to try the SET amp. If I want to keep the PrimaLuna, what parameters should I pay attention to? I know most of them are pretty low power, but as said, power is not the real problem. I don't think they publish the gain info. Also, does the requirement to have input impedance > 100k Ohm still applies? Maybe more straight forward, what is your recommendation?
I tried connecting the DAC directly to the amp, the sound is not good. I also try to lower the volume on the DAC. Although it gives a more usable range for my preamp, it has a small impact on the sound. Lowering volume on iTune sounds better.

I think it is usable as long as I use iTunes, but the next thing I will change would be the power amp, or I will get an integrated. I will get the Zu this week and see how it work.

BTW, tube amps are expensive. I want to keep the budget around 1000, and there are very limited choice. Maybe I will start and thread about suggestions.