Help needed from Spectral preamp owners

Where did you get your pre-amp? It is normal for the output to mute at the last setting. Also, the balance range is quite narrow. It is unlikely that there is a problem with the unit. Have you used a "mono" signal. Please call if you need additional information. We are an authorized Spectral dealer.

Terry Menacker
1.800.838.1812

Bypass the dealer; try contacting Spectral yourself & ask.

You can try measuring the voltage output from the left and right amplifier channels while playing a sine wave test tone and stepping the balance control. I've measured the size of the balance gain step this way.