Power Amplifier Reference 1210a/1211a
INSTALLATIONAND SETUP (CONT.)
SETTING DBO (310a, 610a and 1210a)STATUS LEDs?
The Dynamic Bass Optimizer (DBO) is used toClip: Indicates the amplifier is being overdriven,
enhance low-frequency reproduction in a vehicle.and your speakers may be in danger. This
Conventional bass-boost circuits only increaseshould blink only on musical peaks, and not
bass at a fixed frequency, and cause the amplifierbe on constantly.
to consume considerable power. The DBO allows Power: Indicates the amplifier is on.
you to adjust the frequency (20Hz 80Hz) as wellProtection: Refer to Troubleshooting for specific
as the boost level (up to 12dB; see Figure 14),indications.
allowing you to fine-tune the bass in your system
to optimize performance.Figure 15. LED status.
For sealed enclosures, the DBO can be used
to enhance the lower bass region of sealed
enclosures.
For bigger/fuller bass, adjust the HP FREQ
between 35Hz and 45Hz; adjust the BOOST
control according to your preference.
For tighter-sounding bass, adjust the HP FREQ
between 45Hz and 55Hz; adjust the BOOST
control according to your preference.
For vented enclosures, the DBO should be used
as a subsonic filter to reduce overexcursion
of the woofers. Set the HP FREQ control 10Hz
below the tuning frequency of the enclosure
(e.g., 25Hz for a box tuning of 35Hz); adjust the
BOOST control to taste. This will conserve
amplifier power typically wasted on frequencies
below the tuned frequency of the enclosure.
For infinite-baffle applications, set the HP FREQ to
the speaker?s Fs value (reducing overexcursion of
the woofer); adjust the Boost control to taste.
Figure 14. Frequency-response curves show
typical DBO control ranges.
DBO HP FREQ ControlHP FREQDBO BOOST ControlBOOST
(adjusts cut-off(adjusts boost amount
frequency)at cut-off frequency)
dB20Hz 100HzdB MIN MAX
012
-36
-60
-9-6
-12-12
2080Freq. (Hz)2080Freq. (Hz)
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