| Some preamps are designed with the volume pot as the last thing before the jack. See the internet reverse engineering of the Bart NTMB on the for example. I think they BYOC confidence booster is the same. It's a simple way to control the preamp output but could allow the cable impedance to affect the output a little bit because you now have an R-C circuit between the last active element in the preamp and the input to the amplifier. I haven't run the calcs to see where typical values for cable capacitance, preamp output impedance, and amplifier input impedance might place a roll-off frequency. It could reasonably well out of the audible frequency range, or not. Most times, the resistor used at the output of an active preamp is around 50k. Passive volume pots are 250-500K.
Since it's a common practice, you should give it a try and see if you like it. If not, it's easily reversible.
I added a small JFET buffer to my frankenbass mostly to try it out. The buffer was the last thing before the jack so I'm using the existing v/v/t pots that came with the passive bass. Sounds good to me but I can't say whether or not putting the volume after the buffer would have been better for that application because I haven't tried it.
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Clubs: BTB 118, Ibanez 689, 5-string 436, P&W 820, Lefties who play Rightie 157
BTB675, EDB605, GSR200,
Peavey BAM 210, 115BX BW, TVX 410, Mark VIII XP
Last edited by Rob22315 : 01-17-2011 at 01:38 PM.
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