MEMPHIS SRX150.2V (01) PDF Document

The MEMPHIS SRX150.2V amplifier has the following features:

• 2Ω stereo stable / 4Ω mono

• High & low level inputs

• 0/6/12dB bass boost

• Bridgeable & tri-mode operation

• Protection circuitry: overload, short circuit, thermal & reverse polarity

• Textured aluminum heatsink

• Selectable bass boost

• Variable crossover network

• Ultra-bright LED accent light strip

• Nickel Plated Connectors for solid electrical connection that resist corrosion

Street Reference amplifiers like the MEMPHIS SRX150.2V 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.

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.

The MEMPHIS SRX150.2V 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.

A Blue light indicates that the amplifier is working normally. If the light is not illuminated or is glowing red, consult the troubleshooting section of the manual.

Amplifiers are generally mounted in the hatch/trunk area of your vehicle or behind the seat of most pick up trucks. Select a location that provides adequate ventilation. The 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.

Use conventional stranded copper wire for all connections and finish the ends of the wires at the amp and vehicle with proper size terminals. Poorly made connections or inadequate wire size can generate excessive heat and may lead to equipment failure. Always install the fuse at the battery last.

12 Volt + Connection: Make the 12V+ connection directly at the positive battery post using the proper wire size and fuse. The fuse should be installed within 18” of the battery. This fuse is vital to protecting the vehicle from damage in the case of a dead short.

Ground Connection: Make the ground connection directly to the chassis of the vehicle as close to the amp as possible. Ensure this connection is made with the same wire size as the 12 volt connection. Ensure that all dirt, grease, paint and coatings are removed prior to attaching the ground wire to the chassis.

Remote Turn On: The 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.

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.

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 50Hz to 1kHz and uses a 12dB 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 400 Hz depending on how high the subwoofer 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 a band-pass filter for a midrange speaker already using a passive low-pass filter.

The low pass 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 50Hz-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, 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 is switchable to off (0dB), +6dB, or +12dB. Boost should be used with discretion. Electronically enhanced boost places an additional load on the amplifier and the speakers they are connected to.

Speakers have a positive and negative marking on the terminals. These are used to indicate polarity and must be considered when wiring. Amplifiers also have positive and negative markings on their speaker outputs. Use these markings 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. The MEMPHIS SRX150.2V requires a minimum 2Ω impedance in stereo mode.

To wire in stereo, connect the right speaker to the RCH+ and RCH- terminals, and the left speaker to the LCH+ and LCH- terminals.

To wire in mono (bridged) mode, connect the speaker’s positive lead to the RCH+ terminal and the speaker’s negative lead to the LCH- terminal. In mono (bridged) mode, the amplifier requires a minimum 4Ω impedance.

• 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.

• 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.

Check the input sensitivity control adjustment.

• Whine that increases and decreases with engine speed – confirm the Amp & 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 the above steps do not improve/reduce noise, the system should be checked by a professional audio installer at a Memphis Authorized Dealer.

If the red LED is illuminated, it could mean one of the following:

• Speaker or wire is shorted

• Battery voltage too high

• Battery voltage too low

• Amplifier has overheated due to improper ventilation

*Features and specifications are subject to change without notice.