AC•DRIVER
TM
Acoustic Instrument Preamp
Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam BC V3C 5M5
Tel: 604-942-1001 • Fax: 604-942-1010 • Email: info@radialeng.com
Tonebone AC-Driver
ACousTiC insTrumenT PreAmP
Introduction ....................................................................................... 1
Features ........................................................................................ 2-3
Overview........................................................................................... 4
Making Connections ......................................................................... 5
Setting Levels ................................................................................... 6
Low Cut Filter ................................................................................... 7
Fighting Feedback ............................................................................ 8
Notch Filter ....................................................................................... 9
Tuning and Changing Instruments ................................................... 9
Specications ................................................................................. 10
Block Diagram .................................................................................11
Radial Limited Warranty ...................................................Back Cover
Thank you for purchasing the AC-Driver™, an acoustic instrument preamp designed to provide you
with complete control over your tone on stage.
While the AC-Driver is designed to be easy to use, we recommend taking a few minutes to review
this short manual to familiarize yourself with the various features available. Should you nd yourself
with any questions not answered within this user guide, please visit www.radialeng.com for a list of
frequently asked questions and answers. If you still nd yourself in need of more information, drop us
a line at info@radialeng.com and we will do our best to respond promptly.
Radial Engineering Ltd. AC-Driver™ User Guide
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FEATURES
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1. InpUT – ¼” jack used to connect your
instrument to the AC-Driver.
2. LEvEL – Controls the output level of
both the XLR and the ¼” outputs.
3. noTch – Sets the center frequency
for the notch filter. Used to eliminate
feedback.
4. noTch Q – 3-position switch bypasses
the notch filter or selects between a
normal or extra-deep notch. Works in
conjunction with the notch frequency
control.
5. 180° phASE REvERSE – Used to
reduce on-stage feedback by reversing
the polarity of the XLR output.
6. Low cUT – Variable filter rolls off
excessive low frequencies and controls
bass resonance.
7. oUTpUT – ¼” post-eq output used to
feed an on-stage amplifier.
8. MUTE SwITch And LEd – Footswitch
turns off all outputs except the tuner out.
Used for quiet on-stage tuning.
Radial Engineering Ltd. AC-Driver™ User Guide
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FEATURES
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9. TUnER – Always-on buffered output
is used with the mute footswitch for
quiet on-stage tuning.
10. BALAncEd oUTpUT – XLR line
level output connects directly to a
powered PA speaker or console.
11. LIFT – Ground lift switch disconnects
pin-1 at the XLR output to remove
buzz and hum.
12. 9vdc – Connection for 9-12 volt DC
(center pin negative) power supply.
13. 14-GAUGE STEEL – I-Beam
construction prevents the circuit
board from being torqued which
could lead to part failure.
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14. connEcToRS – Glass-lled nylon
XLR connector with large nickelsilver pin contacts. Tougher than
steel.
15. cIRcUIT BoARd – Double-sided
military spec for greater durability
and full ground plane to reduce
radio frequency interference.
Radial Engineering Ltd. AC-Driver™ User Guide
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