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In Reply to: RE: Pre-Amp - rookie question posted by pistonengine08 on August 05, 2016 at 05:17:39
Probably. Preamplifiers attenuate a line level signal most of the time, because these sources typically produce 500mV to 2V. In any particular case (e.g. a -15dB setting in this preamplifier), the fixed gain of the preamplifier circuitry (usually 10dB or so) and relative level of the volume control references to 0 gain (usually "0dB")would have to be determined in order to know if the setting is actually amplifying or attenuating the input.
Follow Ups:
" these sources typically produce 500mV to 2V." That certainly has been the case in the past but I have noticed the voltage output of many, if not most, CD players and DACs has typically creeped upwards. I just did a random check on a handful of current players and DACs. The lowest output voltage I found was 2.5v and the highest was 5v. This isn't, of course, a comprehensive piece of research. However as someone using power amps with a 0.5v input sensitivity I have been noting this upward trend for some time. I am also surprised to find that some of the largest Japanese manufacturers no longer quote output voltage in their specifications.
this is becoming a problem of sorts. My Conrad Johnson has a goodly amount of gain and the DAC has at minimum 2.? volts. The volume control becomes a hair trigger.
I would say you could go with a passive but it all depends on your amplifier. Some sound good with passives while others not so good.
charles
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