Polk Audio PSW505 Not Working: Fix Guide

A Polk PSW505 that's gone quiet is rarely a blown sub. The usual culprits are the auto-on circuit not waking up, a loose or wrong LFE/line input, or the level turned down — all easy to check. Start with the light on the back, because it tells you whether the sub even thinks it's playing.

Read the standby light first

The PSW505 has a power LED on the amp plate. Green means it's on and receiving signal; red (or amber) means it's in standby, waiting for audio. If it stays red while you're playing bass-heavy content, the sub isn't getting a signal strong enough to wake it — which points you straight at the connection or the auto-on sensitivity, not the speaker.

Fix it

1. Confirm power and the on mode. Make sure it's plugged in and the rear power switch is on. Set the mode switch to Auto / On (not Off). In Auto, the sub sleeps until it senses signal — handy, but it's also the #1 reason a PSW505 seems "dead."
2. Check the connection. From the receiver's Subwoofer / LFE / Sub Out to the PSW505's line-level input (use the LFE input if present), with a shielded sub cable. A half-seated or failing cable kills the signal. If you're using speaker-level inputs instead, confirm those are wired correctly.
3. Turn up the level and check the crossover. The sub's Volume/Level knob has to be up enough to wake the auto-on circuit and be audible. If your receiver does the bass management (most do), set the sub's low-pass/crossover to its maximum so the receiver controls it.
4. Fix it at the receiver too. In the receiver's speaker setup, set Subwoofer = Yes, choose an LFE/sub-out, and set a crossover (80Hz is the common default). Run the receiver's room calibration if it has one — a sub set to "None" in the receiver sends it nothing. The broader subwoofer no-sound-with-a-receiver guide covers the receiver side in more detail.
5. Test with a known bass source. Play a movie scene or track with obvious low end. Quiet dialogue won't trip the auto-on; deep bass will.

The auto-on quirk worth knowing

The PSW505's auto-on needs a certain signal level to wake, and at low volumes — or with a weak sub-out level — it can keep dropping back to standby mid-movie, so you get bass that cuts in and out. If that's your symptom, nudge the sub's level up and raise the receiver's subwoofer trim, or switch the sub to On instead of Auto to keep it awake.

FAQ

The light is red and there's no bass — what's wrong? Red is standby. The sub isn't getting enough signal to wake. Check the cable to the receiver's sub-out, turn up the level, and play something with real bass.

My sub cuts in and out during movies. The auto-on is dropping to standby at quiet moments. Raise the sub's level and the receiver's subwoofer trim, or set the sub to On instead of Auto.

No sound at all even on On. Check the cable into the receiver's Sub Out and that the receiver's setup has Subwoofer = Yes with a crossover set. A sub set to "None" in the receiver gets no signal.

Which input do I use? The line-level/LFE input, fed from the receiver's Subwoofer/Sub Out with a shielded sub cable.

If the PSW505 turns out to be genuinely dead, our best subwoofers for home theater covers current replacements at this price.