Memphis PRX624 6-1/2in Selectable 4 or 2 Ohm Component Subwoofer

Our review of the Memphis PRX624 looks at a compact component subwoofer aimed at drivers who need tighter, controlled bass without a huge enclosure. In practical use the PRX624 stands out for its clear low-end focus and selectable impedance, which makes it easy to pair with a variety of amplifiers. The biggest reason to consider this subwoofer is its balance of usable power handling and a focused frequency range, delivering impactful bass between 50 and 150Hz that complements small to medium car systems rather than overwhelming them.

Key Features

• Selectable Impedance: The ability to switch between 4 or 2 ohm makes matching the PRX624 to different amplifiers straightforward and flexible for system builders.
• Sensitivity 82dB: Moderately efficient sensitivity helps the subwoofer reproduce bass with reasonable output without requiring extremely high amplifier power.
• Frequency Response 50 - 150Hz: The focused frequency range prioritizes low-frequency impact and clarity, which suits music that benefits from tight sub-bass and punchy mid-bass.
• 150W RMS Handling: A 150W continuous power rating provides dependable performance for daily listening at moderate volumes while keeping distortion under control when properly powered.
• 300W Peak Capacity: Short-term peaks up to 300W allow the sub to handle occasional dynamic transients without immediate failure.
• 2in Port Diameter: The port is sized to support the intended tuning and helps maintain consistent airflow for cleaner bass in sealed or small ported enclosures.

Who It's For

The PRX624 is best for car audio enthusiasts building a compact component sub system where space is limited and the goal is tighter, musical bass rather than extreme SPL. It suits users with small to medium vehicles or those pairing the driver with a modest amplifier around the 100-200W RMS range who want predictable, repeatable low-frequency performance.

Those seeking earth-shaking, room-rattling output or very deep extension below 50Hz should look elsewhere; the PRX624 is tuned for controlled response and integration with full-range speakers rather than maximum boom. Also, buyers who need high sensitivity for very low-power factory amps may find the 82dB rating modest compared with other designs.

Pros & Cons

Pros

• Selectable 4 or 2 ohm impedance simplifies matching to a wide range of amplifiers and wiring configurations.
• Focused 50-150Hz response produces tight, musical bass that integrates well with component systems.
• Reasonable 150W RMS handling and 300W peak give dependable daily performance when paired correctly.
• Compact design and 2in port help in tight enclosures where controlled airflow is important.

Cons

• Sensitivity of 82dB is moderate, so very high output may require a stronger amplifier.
• Limited low-end extension below 50Hz means it is not ideal for extreme deep-bass enthusiasts.

Specifications

Driver Size	6-1/2in
Sensitivity	82dB
Frequency Response	50 - 150Hz
Power Handling (RMS)	150W
Peak Power Handling	300W
Port Diameter	2in
Selectable Impedance	4 or 2 ohm

Our Verdict

The Memphis PRX624 is a practical choice for drivers who want controlled, musical bass from a compact component subwoofer and flexible impedance options for amplifier matching. It delivers good value for buyers focused on integration and clarity rather than maximum low-frequency extension, and performs reliably when paired with a modest amplifier in small to medium vehicles.

Frequently Asked Questions

Can the impedance be changed to match any amplifier?
The selectable 4 or 2 ohm setting allows basic matching to most car amplifiers and wiring schemes, but check your amp's recommended load range first.

Is this subwoofer suitable for a small sealed box?
Yes, the PRX624 is suitable for compact sealed or small ported enclosures thanks to its focused 50-150Hz response and 2in port diameter.

What amplifier power is recommended?
Pairing with an amplifier in the 100-200W RMS range will yield good results; its 150W RMS rating provides a practical target for reliable performance.