The Theory Audio sb25 ranks #111 out of 203 total Large Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
Prices on this page were last checked October 9, 2026 at 8:01 AM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
As an eBay Partner, we may be compensated if you make a purchase.
#111 Theory Audio sb25: $3,400 per pair World Wide Stereo eBay
Pros: Strong local Spinorama scores of 4.33 raw and 6.99 with a subwoofer, plus very wide, well-controlled dispersion and high output from a cabinet only 3.8 inches deep. Optional tabletop stands allow conventional bookshelf or console placement. Measured bass extension of 67.4Hz (-3dB).
Cons: It requires a Theory controller-amplifier channel and model-specific DSP, making it much less straightforward than a normal passive speaker. The installation-focused form factor, per-speaker pricing and 60Hz measured extension limit value for ordinary stereo systems.
| Bass Extension (-10dB) | 46Hz (manufacturer specified) |
|---|---|
| Bass Extension (-3dB) | 67.4Hz (measured, spinorama.org) |
| Coverage | 125 degrees conical |
| DIY Kit | No |
| Dimensions | 21.5H x 9.5W x 3.8D in |
| Drivers | Dual 5-inch carbon-fiber woofers, 1.4-inch compression driver |
| Enclosure | Passive sealed surface/tabletop speaker |
| Frequency Response | 54Hz-23kHz (-6dB) |
| Impedance | 4 ohms |
| Maximum SPL | 123dB peak at 1m |
| Power Handling | 200W AES, 800W peak |
| Sensitivity | 94dB (manufacturer specified, 2.83V/1m) |
| Spinorama Preference Score | 4.33 |
| Spinorama Preference Score with Perfect Sub | 6.99 |
| Weight | 22.9 lbs (10.4 kg) each |
- Links
- Reviews, Comparisons and Sound Samples