Short answer: the Carmody S2000. It ranks #29 of 179 bookshelf speakers by sound quality, rated 4.0/5, at $251.06; the Monoprice Monolith THX Compact Satellite ranks #98, rated 3.2/5, at $249.99. With prices this close, go by the sound-quality ranking rather than the cost.
The Carmody S2000 is the more accurate, deeper-bass pick. An inexpensive DIY bookshelf kit with a smooth midrange and wide dispersion that changes little from room to room. Its measured preference score, a predictor of how neutral it sounds, is 4.42 against 3.57 for the Monoprice Monolith THX Compact Satellite. Its bass reaches about 64.5Hz before falling 3dB, against 82Hz for the Monoprice Monolith THX Compact Satellite. The catch: Energy falls off above 3kHz with a resonance around 11kHz, and directivity errors show up around the 4-5kHz crossover region.
What the Monoprice Monolith THX Compact Satellite does well: A compact THX certified sealed satellite with a coaxial driver, wide dispersion and a keyhole slot for wall mounting. Watch for: Bass stops at about 82Hz (-3dB) and 62Hz (-10dB), so it needs a subwoofer for any full-range use, and without one its preference score is only 3.57.
Buy the Carmody S2000. It is rated higher for sound quality, and saving $1.07 with the Monoprice Monolith THX Compact Satellite does not make up for the sound-quality gap.
Still deciding? The full Passive Home rankings cover every ranked option.
Measured Differences
- Bass depth: the Carmody S2000 reaches 64.5 Hz (3 dB down) against 82 Hz for the Monoprice Monolith THX Compact Satellite, about half an octave deeper. You hear more of the lowest bass notes and kick drums.
- Efficiency: the Carmody S2000 is rated at 84 dB sensitivity against 81 dB for the Monoprice Monolith THX Compact Satellite, so it plays as loud with roughly half the amplifier power.
Prices on this page were last checked November 14, 2026 at 6:17 PM 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.
Specifications Side By Side
| Carmody S2000 | Monoprice Monolith THX Compact Satellite | |
|---|---|---|
| Price | $251.06 per pair | $249.99 per pair |
| Ranked | #29 of 179 in Medium Size Bookshelf Speakers | #98 of 179 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 64.5Hz (measured, Audio Science Review) | 82Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 49.8Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) | 61.5Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 84dB (measured, Audio Science Review) | 81dB (manufacturer specified) |
| Impedance | below 4 ohms minimum | 4 ohms nominal (manufacturer specified) |
| Frequency Response | 50Hz - 20kHz (+/-5.9dB); 80Hz - 20kHz (+/-4.1dB) (measured, Audio Science Review) | 80Hz-20kHz ±3dB (manufacturer specified) |
| Drivers | small woofer + tweeter, 3kHz crossover (DIY kit) | 4.5” polypropylene woofer with coaxial 20mm silk-dome tweeter |
| Woofer Cabinet | Baltic Birch plywood | sealed |
| Spinorama Preference Score | 4.42 (spinorama.org) | 3.57 |
| Spinorama Preference Score with Perfect Sub | 6.89 (spinorama.org) | 6.56 |
| Dimensions | 6” x 15” x 9” (152 x 381 x 229 mm) | 6.3”H x 6”W x 5.9”D (160 x 153 x 150 mm) |
| Weight | 11 lbs (5.0 kg) | 4.2 lbs (1.9 kg) each |
| DIY Kit | Yes | No |
Where the Ratings Come From
- Carmody S2000: Spinorama.org measurements and reviews by Audio Science Review.
- Monoprice Monolith THX Compact Satellite: Spinorama.org measurements and reviews by Erin’s Audio Corner.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
Related Speaker Comparisons
How Carmody S2000 compares with other leading options: