|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
200.123.215.113
In Reply to: RE: Thinking of going passive, and need advice posted by BCR on March 25, 2015 at 14:02:04
Yes, mathematically this won't work since posivite 44dB related to 1.5mV is 237mV and you need 1900mV to drive the amp to clipping.
Follow Ups:
Would it work with a cartridge with a 5 mv output? Thanks!
The input sens. of the Quicksilver amps is your problem. 1.9 is pretty low. My mid monos were 1.25 and that wasn't enough for me either. I went with a CJ amp that works great and sounds better than the quickies too.
Oz
Don't worry about avoiding temptation. As you grow older, it will avoid you.
- Winston Churchill
It's only a problem if I want to use a passive preamp .It has plenty of gain when I use an active line stage. Inmate Palurtris explained the reason for the high input sensitivity of the Quicksilvers in this post. I was just curious why a passive would not drive the amps.Thanks for the info!
5mV input with 44dB gain will give you 790mV output, so less than half what you need. The 1900mV input sensitivity of the Quicksilver amp is about double what a typical amp requires for input voltage to drive it to clipping. I am disposed to believe that the Quicksilver amp is intended to have a gain structure that reduces the noise and distortion of a typical preamp/amp combination. Most preamp/amplifier combinations have too much gain which degrades the signal. Normally, the excess gain is reduced in the preamp's volume control so as not to overdrive the amp; but it makes no sense to have a high gain preamp and then an amp that is overly sensitive. Each of the superfluous gain stages add noise and distortion. It appears as if the Quicksilver amplifier is engineered to require an active preamp and the benefit is lower noise overall.
Thanks for the information. How do you arrive at those figures of the 790mv? Inother words what is the calcuation you use?
I use a handy online dB calculator. See below.
Thanks again!
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: