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Old 3rd May 2010, 07:08 PM   #1
VanZea is offline VanZea  Netherlands
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Default Passive mixer with powered preamp?

I'm a musician (keys) and I'm trying to streamline my setup. On stage I use three stereo devices (2xsynth, 1x sampler). All those devices have a volume knop, so on my current mixer (a very small Behringer) I don't use the channel-volume knobs.

I once made a passive mixer consisting of a few resistors which works great, but weakens the signal going to the PA and my monitor.

Can anybody point my to a diy preamp kit (with only a volume control) I can use with my passive mixer? Battery powered (9V) would be great. Could I use 2 of those parallel (on for my monitor, and on for the PA) on the same signal? I need to be able to adjust the signal going to my monitor independent of the signal going to the PA.

Any other suggestions to minimalize my setup?
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Old 3rd May 2010, 11:40 PM   #2
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 4th May 2010, 11:28 AM   #3
VanZea is offline VanZea  Netherlands
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Thanks,

This is exactly what I was looking for. Are there any kits available somewhere for the amp-part of the device?
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Old 4th May 2010, 11:30 AM   #4
VanZea is offline VanZea  Netherlands
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I now see I can also order the board at the provided link. Thanks again, all my questions are answered.
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Old 4th May 2010, 03:16 PM   #5
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Keep in mind that setting one control does affect the other inputs. It is much better to use a buffer on each control.
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