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6 XR2220/XR2420/XR2120
4. OPERATIONS
Setting the operating level
The gain controls allow you to set the nominal operating level of the amplifier from 200mV
to 5.5V for RCA inputs or 400mV to 11V for speaker level inputs. This wide adjustment
range accommodates virtually any source unit brand.
Improving bass sound
The amplifiers feature a narrow-frequency band bass boost circuit (known as “high-Q”). The
bass boost control acts much like an equalizer with switchable gain fixed at 50Hz.
Use this control to tune low-frequency audio response to compensate for a less than ideal
subwoofer enclosure design. The added boost produces rich, full bass tones that are
normally difficult to reproduce in the car audio environment.
Note:
If you don’t want to boost the bass frequencies, set this control to “OFF”.
Designing a more advanced system
Freq (Hz) controls
The crossover frequency is fully adjustable between 30Hz and 300Hz (50-300Hz
on the XR2120). Use the high-pass/low-pass filter controls, along with your speaker
manufacturer’s recommended crossover frequencies, to quickly design a more advanced
system.
Note:
If you set either of the X-Over mode switches “OFF,” varying the Freq (Hz) control
has no effect.
X-Over mode switches
These switches are equipped with 12dB per octave electronic filters for precise
frequency attenuation with minimal phase distortion. To activate each filter, slide the
X-Over mode switch to either HP or LP (XR2420 and XR2220 only).
Connecting a source unit without RCA outputs
The speaker level inputs provide connections for a high-level stereo source. Use them if
your source unit does not have RCA outputs.
6


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