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RE: MGIIIa tweeter question

When you use a PLLXO you have a substantial insertion loss due to the use of resistors in series (for LP) and their need to be an order of magnitude bigger in each progressive filter stage so that you retain Q. So a buffer allows you to have a lower insertion loss by using a lower value resistor in series after the buffer regardless of the values used before the buffer.

A gain stage (preamp) would allow both compensation for insertion loss and buffering and level control. Latency is very small in preamps - a bit longer if they use transformers either at input, interstage or output.
In some tube pre models you can apply part of the filer in the interstage coupling (a smaller cap in the interstage can be used as a HP, a transformer with limited turns can serve as a low pass).


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