2. amps-preamps
  3. 1060874640

What does a pre amp do

I have been trying to get an answer to this question, but so far have not been enlightened

In a modern system, the role of a pre amp is really questionable.

Historically, a pre amp would provide quite a number of real functions such as source selection, impedance matching, maintain volume consistency from different sources, volume adjustment, mute, balance, even tone control, high/low filters

Today, most people have a single CD source with XLR interconnection, which standardized impedance and signal level. Some CD and DAC (such as wadia) has digital volume control. In fact wadia does recommend people to connect directly to their amps

At least in thoery, the best preamp is no preamp. Even the preamp manufacturers agree as evident by the extent they go to separating power supply, minimize signal path. Then there is the passive preamp

So here is the question, is preamp a historical appendix that audiophiles are afraid to get rid of due to the fear of missing out on some unknown elements of music. Or is it really a percived need created by good marketing programs to exploit audiophiles

The obvious answer may be to try it out with and without preamp in the same system. The results I have heard so far are controversial, some claims much better transparency and clarity while others claim there is a lack of dynamics and less musical

I do not believe answers from "experts" who happens to be in a sales position. They always give a very affirmative answer and yet refuse to let you do an A/B comparision.

Most modern preamps are an empty box, and do we need to pay high prices for a piece of equipment with no known function
ag007

Showing 1 response by twl

twl
3,251 posts
 
I believe that preamps have a very important function. They provide control functions, source and output switching, and pre-amplifying of any source items which may be lower than necessary for the needs of the amp input.

As for analog volume controls in preamps, most are not that great, and could be improved, but there are some really good ones. On the subject of digital volume controls, the general consensus is that they are no good, due to "throwing bits on the floor". There are many articles regarding the subject of digital volume controls, and I haven't seen many favorable comments about them.

I also wonder about just what is the definition of a "modern system"? Does that mean CD only? What about analog turntables, and maybe FM tuners? Are these not part of a "modern system"? And that doesn't even consider any HT functions.

There have been a number of threads posted here about the direct connection vs thru a preamp. Many answers depended upon the type of gear being used, and the number of sources that the user wants.

Some people prefer to use a preamp and some prefer to go direct. The results may be better either way, depending upon gear used and user preference. However, I think that it is quite erroneous to consider preamps "a piece of gear with no known function".
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