Quote:
Originally Posted by Art Vandelay
Usually, zero feedback refers to zero global negative feedback, so there's typically local or nested feedback networks in a ZNF amplifier. Use of negative feedback in a preamp is far less problematic, because the preamp will have its output impedance fixed by a resistor, and thus will never be exposed to a load impedance that creates hf stability problems. That said, use of op-amp based filter networks really isn't desirable in a high-end system, so a passive filter is probably the best choice.
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This is true in most cases. In the Ayre products, however, there's zero feedback both globally and locally in any portion of the circuit. It's always been a very strict philosophy at Ayre. At any rate, everyone is spot-on that the use of the filter should be just fine in the system.