1 the diagram for high frequency loss is for a 10K Ohms Pot. 1 recommended 10K Ohms for the pot while others recommended 25 K ohm for large stereo and 10K for portable devices to address Items 10 and 11.ġ3) In Ref. This is due to the capacitance of the interconnects (Passive to amp side) and whatever capacitance in the amp reacting with the Passive resistance (terminal to wipe).ġ2) Ref. This is due to capacitors inside the source reacting with the Passive resistance (the maximum resistance across the terminals.)ġ1) Loss of highs if the Passive Pot resistance is too high. Would the sound be too harsh?Ĩ) The black box mystery: how my equipment would react as the internal circuitry of the amp or source might cause low or high frequency loss?ġ0) Loss of base if the Passive Pot resistance is too low (Source to Passive side). Thus, if by good design there is no frequency loss, it is the standard by which the best preamp can be judged.ħ) Although my class √ amp is reputed to have tube like sound I never heard it without the tube preamp. Because of the circuitry it acts as a high and low pass filter. Distortion is zero, the noise floor is minus infinity. The Passive is, a combination of wires, switches and resistors with capacitance from the interconnects, thus there is no added noise from transistors, tubes or power supplies. A general summary that hits some of the low and high spots, starting with the lows follows:ġ) A thinness of sound even though there is a greater detail.Ģ) A loss of base and punch (which might account for item 1.)Ĥ) A loss of gain that might be unacceptable.ĥ) Magnificent detailing and sound stage equal to the best preamp.Ħ) It of course is not a preamp, which is an active circuit. Other sources warn you need to be careful when designing and applying it. The thread below and others like it contains many valid opinions and experience that serve as a warning that a passive might not work for all systems. Why? Ill show you a way of checking it out without spending more than a dollar. Some say that a Passive Preamp might just be the best value for the dollar, but for others it just doesnt work.
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