Polk Audio RM6750 Powered Subwoofer, Black

The powered subwoofer from Polk's RM6750 home-theater system, this compact bass module pairs a front-firing woofer with a built-in amplifier to anchor the low end in a satellite-based surround setup. The driver mounts in a sealed front baffle behind a full-coverage cloth grille framed in textured black vinyl-wrapped MDF, with a slot port at the base for tuned low-frequency extension. Removing the grille reveals the woofer's metallic-cone driver and a cast basket secured with six bolts — construction consistent with Polk's mid-2000s RM-series satellite systems.

The rear amplifier plate is well-equipped for flexible integration: Volume and Low Pass (80–160 Hz) dials, an On/Auto/Off power mode switch, 0°/180° phase toggle, stereo RCA Line In, and spring-clip Speaker Level Input and Output terminals for looping satellites through the sub's crossover. The RM6750 sub was designed specifically to pair with Polk's RM6750 5.1 satellite speaker system, though its speaker-level inputs accept signal from virtually any receiver. Tested and working; powers on and functions normally.

CONDITION

Good and fully functional. Tested — powers on and operates normally. Shows gentle signs of use including visible scuffs and light scratches to the right side panel; grille and front face are clean.

DIMENSIONS / SPECIFICATIONS

• Model: RM6750 SUB (110V)
• Serial No.: AM676141624
• Type: Powered (active) subwoofer
• Power: AC 110–120V, 50/60 Hz, 100 Watts
• Overall: 17.25" H × 13.5" W × 14.5" D
• Low Pass Crossover: 80–160 Hz, adjustable
• Phase: 0° / 180° switchable
• Inputs: Stereo RCA Line In; Speaker Level Input (spring clip, stereo)
• Outputs: Speaker Level Output (spring clip, stereo)
• Power Mode: On / Auto / Off
• Certification: Entela (US/C)