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In Reply to: RE: Passive preamps posted by Tintin on May 11, 2008 at 04:20:17
They are probably not used more frequently because there are many opportunities to "get it wrong". The issues are questions of physics and not magic. They include
1. Output Z of the source
2. Gain required
3. Input Z of the amp
4. Whether the output Z of the "pre-amp" is relatively constant (as seen by the source and as seen by the amp)
5. Length and capacitance of the interconnects (I am not referring to "fancy" cables but some simple physics of the particular interconnect)
6. Whether the source is "trying" to transfer power or just voltage
If these problems are sensibly dealt with (choice of potentiometer re: Z and perhaps a shunt resistor or using a proper transformer). Theb the results can sound quite good. Again it is physics and not magic (flavor of the solder). BTW, this really is a question of proper design and not wishful thinking about fancy parts providing the "magic". More importantly it can be very affordable.
-Tom
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