This preamp was designed to be used with the EAP pickup, and it features simple adjustments: a Volume Control, a "High/Low" Switch (Ehrlund recommends "low" for upright bass), and a Phase Switch for helping to reduce feedback or for switch phase to match a second pickup/microphone, if applicable. It also properly buffers the signal for whatever you're plugging into.
Ehrlund pretty strongly recommends that you use his preamp for the best possible results, particularly if you play arco.
While it seems to be a pretty simple device, we suspect that Göran Ehrlund has carefully tailored the preamp's setup to specifically suit his pickup - it really does seem to sound better through the Ehrlund preamp than most others we've tried.
This preamp can also be used with most any other piezo-based pickup, and will be a simple means to get transparent sound with an XLR output (so it works like a direct box.) The unit is powered by phantom power, so whatever you plug into must supply it.
• Extremely low noise
• Powered by 48v from mixer or amplifier
• Low power consumption
• Comes with belt clip for easy attachment/mounting
• High/low-level switch and phase switch
• Adjustable volume control
Need to figure out some of the more in-depth features of this product? Here's a copy of the manual, in PDF format, here.
You may wish to visit the manufacturer's website to see if a more recent version is available.