User guide

Bassbone V2 Preamp
Radial Engineering Ltd.
The direct output is equipped with a ground lift and a polarity reverse.
The recessed ground LIFT switch helps eliminate hum and buzz caused
by ground loops. If you hear noise try pushing the ground LIFT switch
inward.
GROUND LIFTPOLARITY REVERSE
The recessed 180° polarity reverse switch inverts the pins-2 and 3 at
the XLR. This is often used to phase-match the PA system to the stage
amp in smaller venues where these two audio sources can sometimes
compete. It can also be used to electronically change a resonant peak to
a phase cancelled null to help alleviate resonant feedback when using
an acoustic instrument such as an upright bass on stage. These two set
& forget switches are recessed to prevent accidental use so use a small
screwdriver to access them.
SPECIFICATIONS
13
Audio circuit type:. . . . . . . . . . . . . . . . . . Discrete class-A FET input with low noise ICs.
Frequency response: . . . . . . . . . . . . . . . 20Hz ~ 18kHz
Total harmonic distortion: . . . . . . . . . . . . 0.05% @ -15dBu
Intermodulation distortion: . . . . . . . . . . . 0.2% @ -20dBu
Dynamic range: . . . . . . . . . . . . . . . . . . . 85dB
Input impedance: Input A: . . . . . . . . . . . 220K
Input impedance: Input B: . . . . . . . . . . . 220K/10M
Output impedance:. . . . . . . . . . . . . . . . . 300 Ohms at XLR
Maximum input: . . . . . . . . . . . . . . . . . . . +7 dBu
Gain:. . . . . . . . . . . . . . . . . . . . . . . . . . . . Unity gain device
Gain-boost drive: . . . . . . . . . . . . . . . . . . 0 to 25 dB
Noise fl oor: . . . . . . . . . . . . . . . . . . . . . . -100dB
Equivalent input noise:. . . . . . . . . . . . . . -92dBu at XLR
HPF-2 high pass fi lter: . . . . . . . . . . . . . . Flat, 35Hz and 60Hz (6 dB/Octave)
XLR confi guration: . . . . . . . . . . . . . . . . . Pin 2 +, Pin 3 -, Pin 1 Ground
Ground lift: . . . . . . . . . . . . . . . . . . . . . . . Lifts pin-1 on the XLR
Power: . . . . . . . . . . . . . . . . . . . . . . . . . . +15VDC/400mA adapter included
Construction: . . . . . . . . . . . . . . . . . . . . . 14 gauge steel
Finish:. . . . . . . . . . . . . . . . . . . . . . . . . . . Powder-coat
Size: (L x W x D). . . . . . . . . . . . . . . . . . . 5.5" x 4.2" x 2" (203 x107 x 48mm)
Weight: . . . . . . . . . . . . . . . . . . . . . . . . . 2.55lb (1157 grams)
Conditions: . . . . . . . . . . . . . . . . . . . . . . . Use in dry locations only between 5°C and 40°C
Warranty: . . . . . . . . . . . . . . . . . . . . . . . . Radial 3-year, transferable