Amplifier Feature Descriptions - Crunch Drive DRA850.2 User Manual

AMPLIFIER FEATURE DESCRIPTIONS

V DRIVE AMPLIFIERS:
Each model is capable of 4 & 2-Ohms stereo per channel, or 4-Ohms mono bridged operation except
the mono amps which are capable of 4, 2 and 1-Ohm loads.
The input sensitivities for rated output powers are variable from 0.2 volts to 6 volts.
All crossovers are fully variable in their respective ranges.
Crossover filters are 12dB/Octave.
A POWER LED indicates the powered up and turned on condition
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose Stereo for full range 2 channel operation or MONO
for bridging operation
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
The 4 channel amps have the same features as the 2 channel models except that there are 2 sets of
controls.
1 set for channels 1 & 2 and 1 set for channels 3 & 4.
In addition, the 4 channel models have a MODE switch which allows for RCA signal routing and
selection.
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose routing of signal within the amp.
-2CH Mode: In this mode, only inputs 1&2 are used. Input 1 (left)is internally routed to speaker
terminals 1&3, while input 2 (right)is internally routed to speaker terminals 2&4.
This is useful when only a stereo source is available. CH1&2 can be set to high pass for highs, and
CH3&4 to low pass for lows, for instance, or set to full range, depending on the application.
-3CH mode: In this mode, input 1&2 signals are internally mono mixed, and routed as a mono signal
to 1&2 speaker terminals. These outputs can be mono bridged into one speaker. Set CH1&2 to low
pass. Input 3 is internally routed to speaker terminal 3, and input 4 is internally routed to speaker
terminal 4. Set CH3&4 to high pass.
-4CH Mode: In this mode, each input is internally routed to the corresponding speaker terminals,
with input 1 to speaker terminal 1 etc.
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
-SUBSONIC: Allows you to adjust the crossover filter from 15Hz to 35Hz.
-LPF: Allows yo to adjust the LOW PASS crossover filter from 30Hz to 250Hz.
LEVEL: Adjusts the input sensitivity from 0.2 volts to 6 volts.
BASS EQ: The Bass EQ is adjustable from 0db to 10dB.
REMOTE: This is the input jack for the remote Level control.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
All Crunch amplifiers feature a comprehensive diagnostic system, with speaker lead short circuit, and
amplifier DC faults indicated by the red "PROTECT" LED.
CAUTION: DO NOT OPERATE ANY AMPLIFIER BELOW THE INTENDED IMPEDANCE. YOU
WILL CAUSE DAMAGE TO THE AMPLIFIER THAT WILL NOT BE COVERED UNDER THE
WARRANTY PRINTED IN THE BACK OF THE MANUAL. 2 & 4 Channel amps are capable of 4
and 2-Ohms wired stereo and 4-Ohms wired mono bridged. The mono amps are capable of 4, 2
and 1-Ohm.
DRA850.2 / DRA1150.2 / DRA4050.2
2-CHANNEL AMPLIFIERS
LINE OUT LINE INPUT
LEVEL
L L
GND
FLASH
HI INPUT
6V
NO FLASH
R R
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic
filter.
-When the LPF mode is selected, a 0 to +12dB, at 45Hz, BASS
-EQ is also switched in.
DRA1050.4 / DRA1450.4 / DRA2450.4 / DRA4050.4
4-CHANNEL AMPLIFIERS
MODE
INPUT
X-OVER
FLASH
2CH 3CH 4CH
NO FLASH
LPF HPF FULL
CHANNEL 1/2 CH1
LPF HPF BASS EQ LEVEL
30Hz 250Hz 60Hz 1.2kHz 0dB 12dB 6V 0.2V CH2
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic
filter.
-When the LPF mode is selected a 0 to +12dB, at 45Hz,
BASS EQ is also switched in.
DRA1850.1D / DRA2550.1D / DRA3250.1D
1-CHANNEL D CLASS MONO BLOCK AMPLIFIERS
OUTPUT INPUT
LEVEL
L L
FLASH
6V 0.2V
NO FLASH
R R
The mono amps are capable of 4, 2 & 1-Ohm loads.
Operating the amp below 1-Ohm can cause damage to the
amp not covered in the warranty.
X-OVER MODE
BASS EQ HPF LPF
FULL LPF HPF
0.2V 0dB 12dB 60Hz 1.2kHz30Hz 250Hz MONO STEREO
CH1 CH2 CH3 CH4
OUTPUT INPUT
X-OVER
GND GND
HIGH INPUT
FULL
HPF LPF
CH3 CHANNEL 3/4
LEVEL BASS EQ HPF LPF
CH4 6V 0.2V 0dB 12dB 60Hz 1.2kHz 30Hz 250Hz
BASS EQ SUB SONIC LOW PASS
0dB 10dB 15Hz 35Hz 30Hz 250Hz
REMOTE
CONTROL