Voodoo Lab Amp Selector - Manual (Page 5)

Each amplifier output is coupled using a high quality shielded and sealed transformer.
Isolating each output with a transformer is what breaks the ground paths between
amplifiers. Without this, current would flow through ground loops causing your amps
to hum. In addition, we have developed a proprietary matching technique to drive the
transformers. By carefully matching impedances and component values we are able to
greatly improve the performance of the transformer. The result is a true, super accurate
sound without any loss of tight low-end response.
The Tuner output provides a copy of whatever goes into Input-A. This is a non-isolated
slave output for a variety of purposes. It is always active regardless of amp switching
status. Typical uses would be to drive a tuner, direct out for recording, or to chain
additional Amp Selectors.
Individual level controls allow you to conveniently balance volumes of each amp. Level
is unity gain at maximum. Any significant volume changes should be done with the level
controls on your amp itself.
In normal operation, the amp select buttons simply toggle each amp output on and off.
Check out the Operation section of this manual for programmable switching options.
Connections
Connect the output of your guitar into Input-A of the Amp Selector. If you are using pedal
effects in front of the amplifier, then connect from the output of your last pedal into
Input-A of the Amp Selector.
Connect Amp Outs 1, 2, 3 and 4 to the inputs of each of your amplifiers.
Initially, set each of the Amp Selector’s Ground Lift switches to the ON‚ position.
If you are going to use two guitars (or the other channel of stereo effects) simultaneously
with different amps, you can connect the 2nd guitar into Amp Selector Input-B. If you do
this, the Input-A instrument will only access amps 1 and 2, and the Input-B instrument
will only access amps 3 and 4.
Power
The Amp Selector can be powered either by its internal 9V battery or an external power
source. The battery compartment is on the bottom of the unit. Use a Phillips head
screwdriver to remove the single screw holding the battery cover in place.
The external power jack requires a regulated 9VDC power source. The connector polarity
must be center negative. The best choice to power your Amp Selector would be with a
Voodoo Lab Pedal Power. It will also work fine with other 9VDC regulated adapters
such as the Boss PSA.
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