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"Love without guts is worthless!" Philip K. Dick
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Munson Township, OH
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I'm not the best person to answer as far as the technicality, but I believe that the ZBox varies the volume in a different, less totally linear way than the CSP series preamps do. Also the CSP series preamps have adjustable output gain per channel, and a far larger power supply. The ZBox can't allow you to tailor the sound the way the others do. The ZBox does offer some tonal and textural changes in a different way, but the CSP series preamps offer greater weight and dynamics to the sound.
The main difference I suppose is that the ZBox does not increase gain, but the CSP preamps dish out gobs of gain. And this has a large sonic impact.
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