The Monoprice Monolith THX Compact Satellite ranks #54 out of 90 total Medium Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: Monoprice
Prices on this page were last checked September 30, 2026 at 2:57 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.
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#54 Monoprice Monolith THX Compact Satellite: $249.99 per pair Amazon Monoprice eBay
Pros: A compact sealed satellite with a 4.5-inch coaxial driver and a 20mm silk-dome tweeter mounted at its center, THX certified and built to sit with a subwoofer crossed over at 80Hz. Erin’s Audio Corner measured a listening window within a 4.0dB span from 300Hz to 5kHz, a smooth predicted in-room response (0.61 smoothness) and wide, even dispersion (about 60 degrees horizontally and 55 degrees vertically), and its preference score rises to 6.56 with an ideal subwoofer. A keyhole slot makes wall mounting easy. Measured bass extension of 82Hz (-3dB).
Cons: 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. Sensitivity is a low 81dB into a 4-ohm load, so it needs a capable amplifier to play loud. Out of stock at Monoprice and Amazon, with Monoprice quoting a restock date well into 2027.
How it compares: Just above it: JBL Stage 250B - $190 more, 5Hz higher bass extension (-3dB). Just below it: XSA Labs Vanguard - $745 more, 2Hz higher bass extension (-3dB).
| Bass Extension (-10dB) | 61.5Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 82Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 6.3”H x 6”W x 5.9”D (160 x 153 x 150 mm) |
| Drivers | 4.5” polypropylene woofer with coaxial 20mm silk-dome tweeter |
| Frequency Response | 80Hz-20kHz ±3dB (manufacturer specified) |
| Impedance | 4 ohms nominal (manufacturer specified) |
| Sensitivity | 81dB (manufacturer specified) |
| Spinorama Preference Score | 3.57 |
| Spinorama Preference Score with Perfect Sub | 6.56 |
| Weight | 4.2 lbs (1.9 kg) each |
| Woofer Cabinet | sealed |
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