Memphis SRX1240V 12" 4-Ohm Single Voice Coil Subwoofer

The Memphis SRX1240V is a 12-inch Street Reference car subwoofer designed to add low-frequency output to a vehicle audio system. Its single 4-ohm voice coil makes it a straightforward choice for an amplifier that is stable at a 4-ohm speaker load. It is intended for customers building a compact daily-driver bass system or replacing an existing 12-inch subwoofer.

Rated for 300 watts RMS and 600 watts peak power, the SRX1240V is suited to properly matched amplification rather than oversized power. Its 85 dB sensitivity and 12-inch cone support bass reproduction in an enclosure designed for the driver. The single-voice-coil layout also keeps wiring simple when using one subwoofer.

A polypropylene cone and rubber surround form the moving assembly, combining a durable cone material with a flexible outer suspension. The progressive poly cotton spider is designed to help keep cone movement controlled. Together, these components support consistent operation in everyday vehicle audio use.

Memphis uses an anodized aluminum voice coil former and a 30-ounce magnet in this model. The subwoofer also has 12 AWG compression terminals for secure connection of appropriately sized speaker wire. Its stamped steel frame provides the mounting structure for installation in a compatible enclosure.

The SRX1240V is optimized for sealed or ported enclosures, allowing the enclosure choice to be matched to available space and listening preferences. Memphis lists a 1.0 cubic-foot sealed enclosure volume and a 2.2 cubic-foot ported enclosure volume. Verify enclosure dimensions, amplifier compatibility, and mounting clearance before installation.

Key Features

• Single 4-Ohm Voice Coil: Simplifies amplifier matching for a single-subwoofer installation.
• 300W RMS Handling: Supports use with a properly matched 4-ohm amplifier channel.
• Polypropylene Cone: Provides a durable cone surface for automotive bass duty.
• Rubber Surround: Supports cone travel while helping protect the moving assembly.
• Progressive Poly Cotton Spider: Helps maintain controlled cone motion during operation.
• Sealed Or Ported Compatibility: Offers enclosure flexibility for different installation goals.

Design & Installation

The SRX1240V uses a stamped steel frame, polypropylene cone, rubber surround, progressive poly cotton spider, anodized aluminum voice coil former, and 30-ounce magnet. Its compression terminals accept up to 12 AWG speaker wire. The grille is not included; Memphis lists the PRXG12 as an optional 12-inch grille.

Plan for a 4.92-inch mounting depth and an 11.1-inch cutout diameter when building or selecting an enclosure. Use a sealed enclosure of 1.0 cubic foot or a ported enclosure of 2.2 cubic feet as listed for this model, and connect it to an amplifier compatible with a single 4-ohm load. Professional installation is recommended when enclosure fabrication, amplifier power wiring, or system tuning is needed.