VARIABLE CONTROLS
These two adjustments control the “Bass Restoration” functions of the unit. The FREQUENCY control allows
you to pick the center frequency that you want the Bass Accelerator circuit to maximize. The VARI Q control
adjusts how wide of a frequency range the restoration will effect.
ADJUSTING THE BASS ACCELERATOR
The Bass Accelerator provides variable enhancement of the bass frequencies. The level of peak boost varies
from 0 to +12dB. The frequency that peak boost occurs is adjustable from 20Hz to 80 Hz. The Vari Q settings
can be adjusted from MIN to MAX. When adjusting the Q, turning the control to MAX will boost a wide range
of frequencies and is useful for general sound quality enhancement. Setting the Q to MIN will boost a narrow
range of frequencies and can be used to tune a subwoofer system for maximum output. Rotating the VARI Q
between MIN and MAX will provide you with a linear progression of frequency boost.
TUNING THE BASS ACCELERATOR
Before you begin, be sure that your loudness setting is turned OFF and the bass boost setting you your ampli-
fier is turned OFF. The ABA-1 will replace these settings. Leaving these setting on will cause audible distortion
and lead to damage or destruction of your subwoofer and amplifier.
The Bass Accelerator VARI Q adjustment should be set to the MIN position. The FREQUENCY control should be
set to approximately one octave below the subwoofers resonate frequency. In vented enclosures, the roll off of
the system is quite steep below the tuning frequency (typically 24dB/octave). In this case, the Bass Accelerator
should be set to the MAX position.
SPECIFICATIONS
ABA-1 BASS ACCELERATOR
Frequency Response: 10Hz - 100Hz
S/N: >100dB
THD: 0.003%
Input Impedance: 10K ohm
PWM Power Supply: 10 – 16V DC, negative ground
Power Draw: 150mA
Recommended Fuse: 1 Amp
Dimensions: 1.212" (H) x 7.477" (W) x 5.178" (D)
31mm (H) x 190mm (W) x 132mm (D)
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