MODEL BII SPECIFICATIONS
Measured with all tone controls at center detent and volume at max.
Nominal Input Level: -20 dBV
Input Overload (20 Hz to 20 kHz): +8 dBV
Input Impedance: 10 MOhm
Output Impedance: Less than 3.5 kOhm
Output Level: -20 dBV with minimum input gain position
-8 dBV with maximum input gain position
THD: .01% at 1 kHz, -10dBV input, -4 dBV output
Signal to Noise Ratio: 91 dB (A weighted, -10 dBV input,
-4 dBV output)
Bass Control Range: ± 11 dB at 60 Hz
± 3 dB at 350 Hz
Treble Control Range: ± 11 dB at 10 kHz
± 3 dB at 1.2 kHz
Current Drain: Less than .4 mA
Power Supply: 9V alkaline battery (estimated 1400 hours
continuous use) Regulated 9V AC Adapter
Tip = negative 9 V
All specifications subject to change without notice.
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User Guide
User Guide
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Outboard Acoustic Preamps
Outboard Acoustic Preamps
Input Gain Continued
If the signal coming from your pickup is very weak, turn the input gain clockwise to
reduce the overall system noise (hiss). If you hear distortion when you play (with a
fresh battery), lower the input trim until it goes away.
Sub Bass
You'll find this control located on the back of the preamp, to the right of the input gain
control. Use a slot head jeweler's screwdriver to raise or lower the sub bass level.
For instruments with lots of natural deep bass, typically dreadnought and jumbo style
guitars, leave the sub bass at its factory set full counterclockwise position.
For instruments that don't naturally produce a lot of deep bass, such as small bodied
electro-acoustic guitars, adjust this control clockwise to add bass resonance.
Low Battery Light
This light has two distinct functions:
1. Power Up Indicator
The low battery LED will flash briefly when the unit turns on. Some people ask
us, "Why doesn't this light stay on, like a conventional pilot light?" We believe that
a steadily lit LED devours too many precious hours of battery life. So, by briefly
flashing the Pro EQ II's light when the unit turns on, we conserve power and
extend the useful life of the battery.
2. Low Battery Warning
When the Low Battery LED lights steadily, it is time to change the battery.
Phase
This control works to suppress acoustic feedback and can drastically affect your
amplified tone. Flip the Phase switch back and forth until you find a position that
sounds good and subdues feedback.
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