The Infinity Primus 150 ranks #77 out of 144 total Medium Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: Infinity
Prices on this page were last checked October 6, 2026 at 10:23 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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#77 Infinity Primus 150: $200 per pair Discontinued eBay
Pros: A budget two-way with a 5.25” woofer and a 0.75” tweeter. Sensitivity is 88dB. Measurements show a preference score of 4.21 that reaches 7.05 with an ideal subwoofer, with 0.39 listening window deviation. Measured bass extension of 68.3Hz (-3dB).
Cons: Infinity ended its home speaker line. Bass reaches 68.3Hz (-3dB) and about 57Hz (-10dB). Discontinued.
Related speakers: Infinity Primus 360.
How it compares: Just above it: KEF Q4 Meta - $400 more, 2Hz lower bass extension (-3dB). Just below it: SVS Prime Satellite - $199 more, 3Hz lower bass extension (-3dB).
| Bass Extension (-10dB) | about 56.8Hz (measured, third-party data via spinorama.org) |
|---|---|
| Bass Extension (-3dB) | 68.3Hz (measured, third-party data via spinorama.org) |
| DIY Kit | No |
| Dimensions | 12.7”H x 7.4”W x 10.5”D (322 x 187 x 267 mm) |
| Drivers | 5.25” (130mm) woofer, 0.75” (19mm) tweeter |
| Frequency Response | 58Hz-20kHz (manufacturer specified) |
| Impedance | 8 ohms |
| Sensitivity | 88dB (manufacturer specified) |
| Spinorama Preference Score | 4.21 |
| Spinorama Preference Score with Perfect Sub | 7.05 |
| Weight | 13.2 lbs (6 kg) each |
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