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SP25B "Super Pre-amp" Information
"Super Pre-Amp"
The 'super pre-amp' has 3 outputs. There are two XLR outputs, each for a different use. The one on the left is your standard XLR output for standard use to a PA system. The XLR on the right is an isolation transformer. If you are performing with a PA that starts to "hum", move the connection from the standard XLR output to the right or isolation XLR output. This should eliminate the 'hum'.
The 1/4 inch output is your line driver. You can use the line driver in conjunction with your amp, and send the XLR signal to the house PA or recording device. The external volume control is for the line driver / 1/4 inch output.
The Pre-amp works with Phantom Power or a 9-volt battery. We recommend using the 9-volt battery all the time. The line driver and isolation transformer will not work unless you have a 9-volt battery in the pre-amp.
The preamp also has an internal volume control that you can adjust with a screw driver. You should only use this if more or less gain is required to match the gain on your existing amplifier.