About the PSB CSIW SUB28
Enjoy solid bass without taking up floor space
Enjoy solid bass without taking up floor space
I love the sound and feel of good bass when I watch movies on my home theater system. The downside? The large subwoofer enclosure that I had to carve out a spot for in my room. PSB's CSIW SUB28 delivers the best of both worlds — tight, clean bass with zero footprint.
This hideaway enclosure houses two 8" woofers that deliver high-quality bass without taking up any floor space. It's an excellent complement to a PSB in-wall or in-ceiling stereo or home theater system.

A built-in back-box keeps dust and dirt out while providing a high-quality sonic enclosure for the two 8" woofers.
Be sure to use matching PSB amplification
The CSIW SUB28 is designed for use with PSB's matching PSB CS 500W subwoofer amplifier (sold separately).
This sleek amp delivers a robust 500 watts of power at 4 ohms — enough to drive this enclosure's twin woofers with authority.
Installation note: the CS 500W does not get installed inside the wall — it goes in your equipment rack or on a shelf along with your home theater receiver and other A/V gear.
Built-in back-box helps produce high-quality bass
This sub's excellent performance is due in part to its carefully designed sealed enclosure. You get consistently focused, powerful bass no matter what kind of space is behind it in your wall. It also keeps dust and dirt out.
DIY installation
If this is a do-it-yourself install, check out my guide to installing in-wall speakers, along with our selection of in-wall speaker wire.
Product highlights:
- passive in-wall subwoofer for an in-wall music or home theater system
- designed to work with the matching PSB CS 500W subwoofer amplifier (sold separately, required for operation)
- dual 8" polypropylene woofers
- sensitivity: 87 dB
- nominal impedance: 4 ohms
- recommended amplifier power: 500 watts
- built-in back-box delivers consistently focused, powerful bass no matter what kind of space is behind your wall
- acoustic suspension (sealed) enclosure
- ideal for both new and existing construction
- fits between two 2" x 4" studs that are 16" on-center
- paintable magnetic grille
- cutout dimensions: 12"W x 24"H
- mounting depth: 3-1/2"
- overall dimensions: 13-1/2"W x 25-3/8"H x 3-3/4"
- weight: 26 lbs.
- warranty: 5 years
- Our 60-day money-back guarantee
- MFR # PSB CS IW SUB 28
Reviews
Customer reviews
Loading reviews...
Thanks for submitting your review
Customer photos
More details on the PSB CSIW SUB28

Features & specs
Features | ||
---|---|---|
Quantity in Package | Single | |
Tweeter | --- | |
Aimable Tweeter | No | |
Woofer Composition | Polypropylene | |
Woofer Surround | Rubber | |
Moisture-resistant | No | |
Connector Type | --- | |
Bi-Amp Inputs | --- | |
Built-in Back-box | No | |
Specs | ||
Tweeter Size | --- | |
Midrange Size | --- | |
Woofer Size | 8 | |
Speaker Shape | N/A | |
Cutout Width | 13.5 | |
Cutout Height | 25.6 | |
Mounting Depth | 3.75 | |
Power Range (Watts) | --- | |
Sensitivity | 87 dB | |
Impedance (Ohms) | 4 | |
Frequency Response | Not givenHz | |
Parts Warranty | 5 Years | |
Labor Warranty | 5 Years |
Loading accessories...
Customer Q&A
Loading articles...