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Features
Controls
Connections
Features
Digital Signal Processing: The MS-A5001 is a mono subwoofer
amplifier with a digital signal processor (DSP) built in to control input mixing,
crossover settings, and output level. Once the gain is adjusted for the incoming
signal, it is converted from analog to digital and routed through the DSP,
then to the Class-D amplifier.
Setup Disc: The included setup CD is used to correctly adjust
the input gain. With the amp in setup mode, a test tone is output from the disc
with the radio at full volume (the amplifier output is muted) and the amp measures
the line voltage, guiding you with arrows on the display as you adjust the gain
controls.
Signal Sensing: The MS-A5001 has a remote turn-on terminal
that activates the amp with an input between +5 and 12+ volts DC. If the connected
radio has no remote lead, or you prefer not to use it, turn on the signal sensing
turn-on circuit and the amp will turn on whenever an audio signal is present at
the inputs.
Crossovers: There are independent
high-pass and low-pass crossovers; they can be used individually or both can be
used together as a band-pass crossover. The slope of each is adjustable (6 dB/oct,
12 dB/oct, and 24 dB/oct) and the crossover point has 98 options:
- 20 Hz to 110 Hz in 1 Hz steps
- 115 Hz to 140 Hz in 5 Hz steps
- Off
Subsonic Filter: The high-pass
crossover can be adjusted to act as a subsonic filter (20 Hz, 21 Hz, etc).
Audio Input: If your radio has no line-level outputs, use
the included adapters to convert the speaker wires to RCA and plug them into
the amplifier's inputs. The differential inputs will accept any signal from
100mV to 20.0V; set the input selector switch to Hi when using speaker-level
inputs. The input selector switch also has a Hi2 position, used to present a
speaker load to factory radios equipped with a circuit that turns the radio
off when an amp is connected.
Wireless Bass Control: An optional MS-WBC wireless bass
control (item number
109MSWBC, sold separately) is available to remotely adjust
the bass output. The MS-WBC communicates via RF signal and requires no physical
connection to the amp; it's also battery powered, but has an optional power wire
if you prefer not to replace the battery periodically. When adjusting the bass
output, the DSP also adjusts the crossover, so the tonal quality of the bass
(and its apparent location) doesn't change.
Controls
Controls:
- Input Gain: rotary knob
- Input Selector: three position switch;
Lo (line-level RCA), Hi (speaker-level), or Hi2 (used only
with factory radios having a circuit that turns the radio
off when it sees no speaker load)
- Input Mixer: one or two inputs can be
used with no need for a Y-adapter; select 1 (mono input),
1/2 (stereo input is summed to mono)
- High-Pass Crossover Slope: 6 dB/oct,
12 dB/oct, or 24 dB/oct
- High-Pass Crossover Frequency: choose
from 97 options from 20 Hz to 140 Hz, or off
- Low-Pass Crossover Frequency: choose
from 97 options from 20 Hz to 140 Hz, or off
- Low-Pass Crossover Slope: 6 dB/oct,
12 dB/oct, or 24 dB/oct
- Output Level: adjust from 0 to 80;
important when matching tweeters and midrange, subwoofer
and full range speakers, etc
Connections
Inputs and Outputs:
- Power and Ground Terminals: set screw
terminals; accept up to 4 gauge bare wire; requires included
4mm Allen wrench
- Note: JBL recommends the power and
ground cables be 8 gauge minimum. The recommended accessory
list for the MS-A5001 includes wiring kits with 8 gauge wire
and 60 amp fuses, but the amp has two 40 amp fuses (80 amps
total), so if one of these kits is used a replacement fuse
(at least 80 amps) must also be added. If a 4 gauge wiring
kit is used no additional fuse is necessary.
- Remote Turn-on Terminal: set screw
terminal, accepts up to 8 gauge bare wire; requires included
2.5mm Allen wrench
- Speaker terminals: two sets of outputs
wired in parallel to easily connect two subwoofers; set screw
terminals, accept up to 8 gauge bare wire; require included
2.5mm Allen wrench
- Audio Inputs: 2 female RCA jacks;
labeled channels 1 and 2; compatible with a speaker level
signal using the included adapters
- Line Level Outputs: 2 female RCA jacks;
no crossover is applied
