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ssimon's picture
Last seen: 5 years 1 month ago
Joined: Apr 25 2008 - 10:34am
matching preamp to amp

I'm thinking about using a Benchmark HGC as a preamp (and DAC of course) with my Quicksilver tubed monoblocs. The Benchmark RCA output impedance is 30 Ohms. The Quicksilvers have an input sensitivity of 1.25 volts and input impedance of 100K ohms.
I was hoping a forum user might be able to do the math and tell me whether the preamp will be able to drive the Quicksilvers.
Thanks and best

shp's picture
Last seen: 1 year 1 month ago
Joined: Nov 18 2007 - 4:57pm
It our be great to understand

It our be great to understand how all of that works. I hope someone responds. 

Demondog's picture
Last seen: 6 years 5 months ago
Joined: Feb 22 2009 - 5:01pm
Looks good to me.

The low 30 ohm impedance output of the Benchmark as source, into the high 100K ohm load of your amps easily meets the general rule that load impedance be at least 10X source impedance, or more. We are only looking for voltage signal transfer, not power transfer (current), so a high load impedance to source impedance ratio is desirable.

The Benchmark has output to 1.77 volts, so your amp sensitivity of 1.24 V is also no problem. They should be able to reach full power output.

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