MOREL PERFORMANCE SERIES AMPLIFIERS / Owner’s Manual
MOREL PERFORMANCE SERIES AMPLIFIERS / Owner’s Manual
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8. High/Low Level Input Voltage Selector
Select signal input voltage based on the type of input used. When using an aftermarket
radio, DSP or line level convertor, select Low for levels up to 5V. When using high-level
input from an amplified factory audio system, select High for levels up to 20V.
9. RCA Inputs
Accepts both low-level and high-level signal via RCA style connectors. Use Input
Voltage Selector to choose appropriate voltage level. High-level inputs require the
MPS-HL line level adaptor (sold separately) to convert amplified speaker outputs from
factory audio systems to RCA style connections.
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10. Turn On Mode Selector
Select between 3 modes to turn on the amplifier. When using a switched lead such
as the remove output of a radio, select the default position REM. When connecting to
a factory audio system or alternative source, select Signal and the amplifier will turn
on when it senses voltage through the inputs. DC (DC offset) may be used in some
vehicles where signal sensing does not reliably turn the amplifier on.
11. Input Sensitivity Controller
The input sensitivity controller (gain) is used to properly match input signal levels
from the signal source to optimize the amplifier outputs. THIS IS NOT A VOLUME
CONTROL! To properly set, the maximum unclipped output from the radio or source
must be known using either an oscilloscope or, at minimum, a multi-meter and test
program. The amplifier can then be properly set to maximize output. If the gain is not
set properly the amplifier may clip early and damage your speakers and the amplifier
itself. It is highly recommended to use an audio specialist to properly adjust.
12. Subsonic Filter Selector
Designed to be used with small subwoofers or vented enclosures with a high tuning
frequency, users can opt to select a 12dB subsonic filter (highpass crossover)
centered at either 25Hz or 35Hz.
13. Lowpass Frequency Controller
This amplifier is designed as strictly a subwoofer amplifier and therefore the crossover
cannot be defeated. The crossover frequency controller allows the user to adjust the
frequency of the Lowpass crossover filter between 40 and 220Hz.
14. Bass Boost Controller
This allows the user to boost the output of the amplifier centered around 45Hz with a
range of 0 to +12dB.
