O Audio BASH User Manual
O Audio 300W BASH® Subwoofer
Amplifier
User’s Manual
O Audio 300W BASH® Subwoofer Amplifier User’s Manual V1.2 page 1 of 12
Copyright © 2008
TABLE OF CONTENTS
INTRODUCTION...............................................................................................................3
WARNINGS AND CAUTIONS ............................................................................................4
INSTALLATION.................................................................................................................5
CONTROL DESCRIPTION..................................................................................................9
SERVICE AND WARRANTY .............................................................................................10
SPECIFICATIONS ...........................................................................................................11
O Audio 300W BASH® Subwoofer Amplifier User’s Manual V1.2 page 2 of 12
Copyright © 2008
INTRODUCTION:
Thanks for purchasing the O Audio 300W BASH® Subwoofer Amplifier. This amplifier
features BASH® technology which enables a high output power amplifier in a small
package.
Traditional Class AB amplifiers use a fixed voltage power supply. This approach is
wasteful and necessitates extensive heatsinking, particularly for high power
amplifiers such as this one. Additionally, primitive unregulated power supplies are
typically used that require a substantial, and expensive, transformer to assure
stable supply voltages over a range of load conditions. Inexpensive subwoofer plate
amplifiers typically skimp on the transformer size in the interest of low cost.
BASH® amplifier technology marries a robust Class AB amplifier with a smart power
supply that adaptively provides the necessary output voltage required to produce
low-distortion output power. The O Audio 300W BASH® Subwoofer Amplifier will
produce up to 300W RMS into a 4Ù load at a Total Harmonic Distortion (THD) of less
than 0.09% and less then 0.04% between 0W – 275W. With an 8Ù load, the
amplifier will produce up to 150W RMS at a THD less than 0.05%. Soft limiting
circuitry is active above 150W (into an 8Ù load).
In addition to BASH® amplifier technology, the O Audio 300W BASH® Subwoofer
Amplifier includes the essential continuously variable controls (output level, phase,
and crossover frequency) necessary to integrate a subwoofer into your listening
environment.
O Audio 300W BASH® Subwoofer Amplifier User’s Manual V1.2 page 3 of 12
Copyright © 2008
WARNINGS AND CAUTIONS:
WARNING – THIS AMPLIFIER MODULE IS DESIGNED FOR INSTALLATION INTO A
SUBWOOFER ENCLOSURE, OR INTO ITS OWN ENCLOSURE. WHEN PROPERLY
INSTALLED, ONLY THE EXTERIOR FACEPLATE SHOULD BE ACCESSIBLE TO THE USER –
ANY OTHER CONFIGURATION IS NOT SAFE FOR THE CASUAL USER. IT IS IMPORTANT
THAT THIS MODULE BE PROPERLY HOUSED TO PREVENT ACCIDENTAL CONTACT WITH
DANGEROUS VOLTAGES – BOTH MAINS AC (115VAC OR 230VAC) AS WELL AS HIGH
VOLTAGE DC (>42VDC). THESE VOLTAGES CAN INJURE AND KILL AND SHOULD BE
TREATED WITH RESPECT.
WARNING – AS WITH ANY PIECE OF ENTERTAINMENT ELECTRONICS, THIS MODULE IS
INTENDED FOR INDOOR USE. IT SHOULD NOT BE EXPOSED TO WATER (INCLUDING
CONDENSATION).
CAUTION –
setting does not match the actual AC input voltage.
CAUTION – The amplifier relies on convection cooling, so air must pass freely over
the faceplate. Do not mount the amplifier in a location where faceplate airflow is
blocked. The amplifier does include overtemperature protection and will shut down
if overheated. This thermal protection will automatically reset once the amplifier is
cool.
CAUTION – This amplifier is designed for use with drivers that are rated at 4Ù or
greater. Drivers whose nominal impedance rating is less than 4Ù can damage the
amplifier. Driver combinations (this includes any configuration where there are
multiple voice coils) that result in a load of less than 4Ù (when calculated using the
driver’s nominal impedance) can damage the amplifier.
impedance loads are not covered by the warranty.
Damage not covered by the warranty can occur if the AC SELECT switch
Damage caused by low
O Audio 300W BASH® Subwoofer Amplifier User’s Manual V1.2 page 4 of 12
Copyright © 2008
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