Memphis SRX250.1 User manual

MONO AMPLIFIERS

®MEMPHIS
READY TO TURN IT UP? READ THIS FIRST!
Memphis Audio built a 50 year legacy in the audio industry engineering the highest quality products to produce
the best possible listening experience for our fans and loyal supporters. To fully appreciate our products we
recommend taking the time to read and follow the instructions in this manual. As always, we recommend all
installations and service be performed by an authorized Memphis Audio dealer.
For optimal performance, Memphis recommends using only Memphis Connection accessories. Outfitting
....... your system with properly sized Memphis Connection wire and accessories will dramatically boost your
listening experience and increase the durability of your Memphis Audio products.
Street Reference amplifiers feature a MOSFET powersupply with a 12dB per octave crossover to ensure the most
accurate musical reproduction. All models feature a fully variable crossover with 12dB per octave slopes allowing
you the ability to tailor the sound to best fit your speakers and your listening preferences .
.-..... Check out our full line of Street Reference speakers and woofers and multi-channel amps to create a
complete Memphis Street Reference system in your ride.
•2 ohms stereo stable I 1.1 ohms mono
·High Slow level inputs
• Bass Boost l.J5Hz 0/6/12dB
·Variable Subsonic filter [15Hz-50Hz]
·Variable low pass filter [30Hz-250Hz]
FEATURES
• Protection circuitry against overload, short circuit, thermal and reverse polarity
·Remote level control included
Nickel Plated Connectors
Ensures solid electrical connections that resist corrosion.
Fully Variable High & Low Pass Crossovers
Fully variable crossovers promote installation ease and save the cost of outboard crossovers. Additionally, they may
be used in conjunction with outboard passive or active crossovers depending on the complexity required by the
system. The 12dB per octave slope offers roll-off above or below the selected frequency.
Protection Circuitry
Protects against overload, short circuit, thermal and reverse polarity. These protection features are designed to
protect the amplifier from misuse as well as from common causes of amplifier failure.
LED Light
Blue light indicates that the amplifier is working normally. If the light is not illuminated or glowing red please
consult the troubleshooting section of the manual.
Subsonic Filter
A subsonic filter has been provided to filter out unwanted subsonic bass frequencies below the audible range of the
subwoofer. This feature helps to improve the amplifiers overall performance since power is not wasted reproducing
frequencies beyond the speaker operating range.
Remote Level Control
Remote allows you to control the level of the subwoofer remotely by controlling the output level of the amplifier
1

INSTALLATION INFORMATION
Memphis Audio recommends the installation of our products to be performed by an Authorized dealer. Attempting
an installation project on your own or through an unauthorized source may result in damage to your products and
may potentially void your warranty.
Amplifiers are generally mounted in the hatch/trunk area of your car or SUV or behind the seat of most pick up
trucks. Select a location that provides adequate ventilation. Avoid mounting the amplifier with fins facing down.
Amplifier should be secured using the screws provided.
WARNING
For your safety, always inspect the mounting location carefully to ensure you are not drilling into any electrical,
hydraulic, fuel or fluid lines. Always check your speaker load with a multi-meter before connecting the amplifier.
Connecting any speaker load lower than the rated impedance of the amplifier will result in damage to the amplifier.
Damage of this nature is NOT covered under warranty. Please pay close attention to what connections are made to
the amplifier.
TROUBLESHOOTING
When troubleshooting your amp, speaker and speaker wires should be tested first.
No Output:
·Confirm all wiring is firmly connected.
Both +12V and REM terminals must have +12 Volts present and GND must be connected to chassis' ground or to
the negative battery terminal.
·Confirm the signal source is connected and supplying an output signal. To confirm the amp is working, connect
an RCA patch cord to the line inputs of the amplifier [do not connect the other end of the patch cord]. Briefly tap
the center pin of each disconnected RCA with your finger. This should produce a noise [brief static or hum] in
the speakers.
·If the amp is hot, check the speaker impedance or load. The total minimum impedance of all speakers should
not be lower than the rating of the amp.
Weak Output
·Check input sensitivity control adjustment.
·Check subsonic filter setting
Unwanted Noise
·Whine that increases and decreases with engine speed- confirm the AmpS Source unit are grounded properly.
·Clicking or popping noise at a rate that follows engine speed- this is often induced by the vehicles ignition system.
Confirm that the vehicle is equipped with resistor spark plugs and wires. The ignition system may need service.
·Noise can be caused by routing speaker input wires too close to the light wires and other accessory wires in the
vehicle. Re-route wires to avoid unwanted interference.
·If above steps do not improve/reduce noise, the system should be checked by a professional audio installer at a
Memphis Authorized Dealer.
2

POWER
SUPPLY
CDNNECTDINS
/A.
Install
the
fuse
at
the
battery
last!
£
Use
conventional
stranded
copper
wire
for
all
connections.
Finish
the
ends
of
the
wires
at
the
amp
and
vehicle
with
proper
size
terminals.
Poorly
made
connections
and/or
inadequate
wire
size
will
generate
excessive
heat
and
may
lead
to
equipment
failure.
12
Volt
+
Connection
make
the
12V+
connection
directly
at
the
positive
battery
post
using
the
proper
wire
size
and
fuse
listed
below,
The
fuse
should
be
installed
within
18"
of
the
battery.
Wire
Fuse
Model
Gauae
Value
SRX250.1
8
15Ax2
SRX500D.l
q
25Ax2
SRX750D.l
q
35Ax2
SRX1200D.l
3
QOAx3
Ground
Connection:
Make
ground
connection
directly
to
the
chassis
of
the
vehicle
as
close
to
the
amp
as
possible.
Make
sure
this
connection
is
made
with
the
same
wire
size
as
used
for
the
12
volt
connection.
Ensure
that
all
dirt,
grease,
paint
and
coatings
are
removed
prior
to
attaching
the
ground
wire
to
chassis.
Remote
Turn
On
Remote
turn
on
should
be
connected
to
the
source
unit's
remote
turn
on
lead
or
power
antenna
output
wire.
When
using
the
power
antenna
wire,
make
certain
it
does
not
lose
power
when
any
source
other
than
the
radio
is
selected.
Figure
1
FUSE
HOLDER
REMOTE
TURN
ON
(NEAR
BATTERY]
CHASSIS
GROUND
[-]
BATTERY
FUSE
I
3

FEATURES AND CONTROLS
SRX250.1// SRX500D.l// SRX750D.l// SRX1200D.l
BASS EQ LPF SUB SONIC GAIN
LOW INPUT
eee
30Hz 250Hz 15Hz 50Hz 6.0V O.lOV
~
OdBBdB l2dB
®)MEMPHIS
SETUP AND ADJUSTMENT
Gain
The gain control is NOT a volume control. The gain control adjusts the amount of signal required to drive the
amplifier to full output. With the gain at full clockwise rotation, less signal voltage is required to drive the amp to
full output. With the gain at full counter clockwise rotation, more signal voltage is required to drive the amp to full
output. For optimal performance, set the gain control to minimum.
Low Pass Filter [LPFJ
The lowpass crossover/filter is designed to remove high frequency information from a speaker. This is generally
used to prevent mid bass speakers or subwoofers from trying to reproduce mid and high frequency information that
they are not designed to reproduce. The crossover frequency is adjustable from 30Hz to 250Hz and uses a 12dB per
octave slope. To engage the LPF slide the switch to the position marked LPF. Frequency selection is made by rotating
the dial: clockwise raises the frequency and counter clockwise lowers the frequency. Most subwoofers should be
set between 80Hz and 100Hz depending on how low the mid-bass or midrange drivers are capable of playing.
Bass Boost
Bass boost is switchable to off [OdB] or +6dB and +12dB. Boost should be used with discretion. Electronically
enhanced boost places and additional load on the amplifier and the speakers they are connected to.
Remote Level Control
The amplifiers have inputs for a remote level control [RLC]. This will allow the amplifier input level to be adjusted
from the listening position. Connect the RJLI5 jack on the front of the amplifier. Install the control module in front of
the vehicle in a location that is easily accessable to the driver.
Subsonic Filter
The subsonic filter utilizes an internal12dB per octave slope and is variable from 15Hz to 50Hz.
4