Memphis SRX150.2 User manual

MEMPHIS
PRODUCT MRNURL 6 INSTRLLRTION GUIDE
f i;I STREET REFERENCE I
MODELS: SRX150.2 // SRX300.4
MULTI CHANNEL AMPLIFIERS

1
®)MEMPHIS
- STREET REFERE NC~
· J1i#MIMIM;-=
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 .
...... •
111
Check out our full line of Street Reference speakers and woofers to create a complete Memphis
Street Reference system in your ride.
FEATURES
•2 ohms stereo stable / LI ohms mono
• High S low level inputs
• 0/6/12dB Bass Boost
• Bridgeable S Tri - Mode operation
• Fully variable high Slow pass crossovers
• Protection circuitry against overload , short circuit , thermal and reverse polarity
Bridgeable & Tri·Mode Operation
Street Reference Amplifiers can be used in stereo , bridged or tri-mode operation. Tri-Mode operation means that a
pair of speakers are wired in the conventional stereo manner while a subwoofer is simultaneously connected to the
bridged terminals of the same two channels. This is useful for simple 2-channel systems that require a subwoofer in
addition to the full range speakers .
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.

2
INSTRLLATION 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 .
If you are uncertain or uncomfortable proceeding with your installation, please contact your local
authorized Memphis Audio Dealer
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 .
Only One Channel Works:
• Confirm the speaker terminal strip connections are firmly connected.
• Check "balance" control on your signal source.
• If using RCA Low-Level inputs , reverse the input plugs at the amplifier . If the channel that is silent reverses
position, the problem is in the source unit or connecting cable .
Weak Output
• Check input sensitivity control adjustment.
Unwanted Noise
• Whine that increases and decreases with engine speed - confirm the Amp 6 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 .
Red LED is Illuminated
• Speaker or wire is shorted • Battery voltage too low
• Battery voltage too high • Amplifier has overheated due to improper ventilation

3
POWER SUPPLY CONNECTOINS
£ 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
Gau!le Value
SRX15O.2
8 2OA
SRX3OO .Q q
25Ax2
&round 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 l
FUSE HOLDER REMOTE TURN ON
[18" FROM BATTERY)
-
-
CHASSIS GROUND (-)
BATTERY
FUSE
~

4
CONTROLS
SRX150.2
LOW INPUT LOW OUTPUT HIGH INPUT
e
5 0Hz !KH z
Q8~8
H PF FULL LPF 30H z 15 0Hz 11d8 B dB □ dB 6.0V 0.I0V
lt3I
+@ -1 - 0+
SRX300JI
HIGH INPUT
LO W INPUT
~
+RF_ .,.._ LF+
eaa~e
6.0V 0.I0V 0dB BdB 12dB30Hz 250Hz LPF FULL HPF
M OOE
HPF
.,
OJ
CHLI CH3 CH2
HPF5~ , 0

5
SETUP RND 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
High Pass Filter [HPF)
The high pass crossover/filter is designed to remove low frequency information from a speaker. This is generally
used to protect smaller devices from trying to reproduce low frequency information that might damage them. The
crossover frequency is adjustable from 50 Hz to lKHz and uses 12 dB per octave slope. To engage the HPF simply
slide the switch to the position on the marked HPF. Crossover frequency selection is made by rotating the dial:
clockwise raises the frequency, counter-clockwise lowers the frequency. Most mid-bass or midrange drivers should
be set between 80 and !JOO Hz depending on how high the subwoofer(s) plays. For mid-range drivers that are 5" or
smaller we suggest setting the HPF to 120Hz. The HPF can also be combined with passive crossovers on a separate
or coaxial speaker set to provide low frequency protection to the midrange driver, or to form band-pass filter for a
midrange speaker already using a passive low-pass filter.
Low Pass Filter [LPF)
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 lOOHz depending on how low the mid-bass or midrange drivers are capable of playing.
Full Range
Sliding the selector switch to this position turns off all crossovers and allows a full range signal to pass. The flat
position should be selected when using outboard electronic crossovers.
Bass Boost
Bass boost on all models is switchable to 0/6/12dB. Boost should be used with discretion, keeping in mind that
electronically enhanced boost places an additional load on the amplifier and the speakers they are connected to.

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SIGNAL INPUT CONNECTIONS
2 CH High Level Connections [SRX150.2)
LOWINPUT LOWOUTPUT
e~e~e.
50Hz lKHz H PFFULL LPF 30 Hz 25 □ Hz 1 2 dBGdB □ dB 6. □ V 0.IOV
q CH High Level Connections [SRX300.II)
LR(•JRED ___ _
----RF(•JVELLOW
LR( · )GRAY ____ I
----RF(·)GREEN
CHASSJSGROUNOJSBIACK----1 ----cHASSISGROUNOJSBIACK
RR(·)GREEN ___ _
----LF(·)GRAV
RR(•JVELLOW __ _
·----LF(•JREO
MODE
a
CH!ICH3 CH2
SPEAKER CONNECTIONS
TRI-MODE: MIXED STEREO/MONO MODE
* Consult with your dealer for options
OPTIONAL INDUCTOR
L•
t. I
)4
LEFT SPEAKER
L·
I
LI Ohms min
OPTIONAL CAPACITOR
R•
'\ I +
RIGHT SPEAKER
R·
LI Ohms min
-----R(•JYELLOW
.... ---R(·)GREEN
----L( - JGRAV
---ll•JREO
SUBWOOFER
LI Ohms min

7
I.JCH MODE
3CH MODE
2CH MODE
SPEAKER CONNECTIONS CONTINUED
q Ch Model (SRX3D0.q)
FUSE
□□
POWER
BATT+ REMOTE GNO
25A 25A
FUSE
□□
POWER
BATT• REMOTE GNO
25A 25A
FUSE
POWER
□□
BATT•
REMOTE
GNO
PRom:T
1~m1rsw111
(R E DI
®iMSAflSO
.,,., ,.,,., ;j!
25A 2!iA
I.JOHM MIN

8
SPEAKER CONNECTIONS CONTINUED
Speaker have a positive and negative marking on the terminals. These are used to indicate polarity and must be
considered when wiring speakers or subwoofers to an amplifier. Amplifiers also have positive and negative
markings on their speaker outputs. Use these marking to match polarities to ensure the speakers are in phase .
Failure to wire speakers or woofers in phase with one another will result in a loss of bass . All street reference
amplifiers require a minimum 2ohm impedance in stereo or q ohms in mono [bridged) mode.
STEREO MODE
MONO MODE
2 Ch Model (SRX 150.2)
FUSE
P;R ~iJ.
PROTECT
[R ED I
20A
R·
R+
FUSE
P;R ~iJ.
PROTECT
IR EO I
20A
L·
R+
POWER
BATT+ REMOTE GND
20HM MIN
20HM MIN
POWER
BATT+ REMOTE GNO
q OHM MIN

9
SPECIFICRTIONS
~
Saecifications SRX150.2 SRX300.'I
RMS Pwr/CH LI Ohms 50Wx2 50Wxll
@s
RMS Pwr/CH2 Ohms 75Wx2 75Wxll
RMS Power/Bridae LI Ohms 150Wx 1 150Wx2
~
THO [LI ohms) <0.1% <0.1%
~
THO (2 ohms)
<0.5% <0.5%
Sianal/Noise Ratio
>90dB >90dB
Channel Seoaration
>50dB >50dB
c:J
@f
Freauencv Resoonse + 0.5dB
20Hz - 20kHz 20Hz-20kHz
Crossover Freauencv LPF
30Hz-250Hz 30Hz-250Hz
Crossover Freauencv HPF 50Hz-lkHz 50Hz-lkHz
~
Bass Boost
LJ5Hz 0/6/12dB LJ5Hz 0/6/12dB
Dimensions
8.071" X 2" X 9.05"
8.071" X 2" X 13.01"
lnnut Sensitivitv
@5
Low Level
100mV-6V 100mV-6V
Hiah Level LJOOmV-12V LJOOmV-12V
@s
lnaut lmaedance
Low Level 10k Ohms 10k Ohms
~
Hiah Level
Ll7 Ohms Ll7 Ohms
Fuse
20 Amo x1 25Amox2
*Features andSpecifications are subjectto change withoutnotice.
SERVICE/RETURNS
Please consult with your local authorized dealer if you experience issues with your unit. You may also contact
Memphis Audio customer service at 800-LJ89-2300 or email tech support directly at: techsupport@memphis-
caraudio . com. Do not attempt to return your amplifier directly to us without first calling for a Return Authorization
number. Units received without an accompanying Return Authorization number will be processed more slowly.
Additionally, you must include a copy of your purchase receipt from an authorized dealer for consideration of
in-warranty service, otherwise repair charges will apply. Units received without a receipt will be held for up to 30
days allowing us time to contact you and obtain a copy of the receipt. After 30 days all units will be returned to you
unrepaired.