Short answer: the PSB Imagine T65 for better sound quality, the Infinity Primus 360 for the lower price. The PSB Imagine T65 ranks #26 of 56 floorstanding speakers at $2699. The Infinity Primus 360 ranks #32 at $650, $2049 cheaper.
What the PSB Imagine T65 gets right: Three-way design with dual 6.5” woven carbon fiber woofers delivers genuinely strong, extended low end for a $2,699 tower - among the better performers Erin has measured in this price class. The catch: Noticeable dip in the midrange/crossover region that Erin flagged as affecting dialogue and vocal clarity, though he notes a couple bands of EQ smooths it out.
What the Infinity Primus 360 offers: A three-way tower from 2005 (two 6.5” mid-woofers, a 4” mid-range, and a 0.75” dome tweeter, 8 ohms nominal) that holds up remarkably well by modern measurement standards: on-axis linearity is within about ±2dB. Watch for: Manufacturer-spec sensitivity of 93dB runs about 3-4dB optimistic versus the measured 89.4dB average.
Buy the PSB Imagine T65 if sound quality matters more than the price. Buy the Infinity Primus 360 if the price matters more than sound quality.
Specifications Side By Side
| PSB Imagine T65 | Infinity Primus 360 | |
|---|---|---|
| Price | $2,699 | $650.00 Discontinued |
| Ranked | #26 of 56 in Large Size Floorstanding Speakers | #32 of 56 in Large Size Floorstanding Speakers |
| Drivers | 1" titanium dome tweeter, 5.25" woven carbon fiber midrange, 2x 6.5" woven carbon fiber woofers | Two 6.5" mid-woofers, 4" mid-range, 0.75" dome tweeter |
| Crossovers | 600Hz & 2000Hz, 4th-order Linkwitz-Riley | 350Hz & 3.3kHz, 24dB/octave |
| Dimensions | 38-13/16"H x 8-3/8"W x 13.5"D (986 x 213 x 343mm) | 39"H x 8-1/8"W x 13-7/8"D (990 x 208 x 330mm) |
| Weight | 44 lbs each | 48.5 lbs (48.5 lbs / 22 kg) each |
| Impedance | 8 ohms nominal (3.3 ohms minimum measured by Erin’s Audio Corner; manufacturer specifies 4 ohms minimum) | 8 ohms nominal, 3.5 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 85.1dB (measured average, Erin’s Audio Corner) | 89.4dB (measured, Erin’s Audio Corner; 93dB manufacturer specified) |
| Recommended Power | 20-200W | 10-200W |
| Bass Reflex | Dual rear slot ports, individual woofer chambers | - |
| Bass Extension (-3dB) | 47Hz (measured average, Erin’s Audio Corner) | 53Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 26Hz (measured average, Erin’s Audio Corner) | 37Hz (measured, Erin’s Audio Corner) |
| Frequency Response | 28Hz - 20kHz (±1.5dB, manufacturer specified) | 38Hz - 20kHz (±3dB, Manufacturer specified) |
| Discontinued | - | Yes |
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The Two Speakers In Full
PSB Imagine T65: $2,699 The Audio Factory
Pros: Three-way design with dual 6.5” woven carbon fiber woofers delivers genuinely strong, extended low end for a $2,699 tower - among the better performers Erin has measured in this price class. Distortion shows a clean second-order character with clear separation from third-order all the way up to 96 dB, indicating a well-controlled motor. Compression data shows enhancement rather than compression below about 50-60 Hz, so the bass can sound louder as you turn it up rather than choking off. Wide, forgiving vertical listening window (about ±25°) thanks to the 3-way layout, giving more seating and placement flexibility than most towers. Plenty of dynamic headroom for home theater use or a two-channel system - 100W drove it comfortably in Erin’s room.
Cons: Noticeable dip in the midrange/crossover region that Erin flagged as affecting dialogue and vocal clarity, though he notes a couple bands of EQ smooths it out. Some horizontal dispersion mismatch (about 10-15° of ballooning between 1-3 kHz) between the midrange and tweeter can add extra perceived attack or detail if your room’s sidewalls are reflective. Dips to 4 ohms, so it wants an amplifier comfortable driving a 4-ohm load. Distortion climbs above 3% around 60 Hz at 96 dB, though it’s benign second-order distortion.
Full PSB Imagine T65 review and specifications →
| Bass Extension (-10dB) | 26Hz (measured average, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 47Hz (measured average, Erin's Audio Corner) |
| Bass Reflex | Dual rear slot ports, individual woofer chambers |
| Crossovers | 600Hz & 2000Hz, 4th-order Linkwitz-Riley |
| Dimensions | 38-13/16"H x 8-3/8"W x 13.5"D (986 x 213 x 343mm) |
| Drivers | 1" titanium dome tweeter, 5.25" woven carbon fiber midrange, 2x 6.5" woven carbon fiber woofers |
| Frequency Response | 28Hz - 20kHz (±1.5dB, manufacturer specified) |
| Impedance | 8 ohms nominal (3.3 ohms minimum measured by Erin's Audio Corner; manufacturer specifies 4 ohms minimum) |
| Recommended Power | 20-200W |
| Sensitivity | 85.1dB (measured average, Erin's Audio Corner) |
| Weight | 44 lbs each |
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Infinity Primus 360: $650.00 Discontinued
Pros: A three-way tower from 2005 (two 6.5” mid-woofers, a 4” mid-range, and a 0.75” dome tweeter, 8 ohms nominal) that holds up remarkably well by modern measurement standards: on-axis linearity is within about ±2dB, and the listening window stays consistent out to roughly ±30° horizontal and ±10° vertical off the mid-range axis. Horizontal directivity is well controlled out to about ±75° before tonality starts to drift, meaning the reflected sound in a room stays close in character to the direct sound - a speaker that takes EQ well without fighting itself. Harmonic distortion measures low at both 86dB and 96dB, and multitone distortion stays under the reviewer’s 3% threshold. Silky, smooth midrange with a rich lower-midrange/upper-bass character. No mechanical issues or surround degradation found in a 20-year-old pair, and a second unit measured within about 1-1.5dB of the first, suggesting good long-term consistency for the design.
Cons: Manufacturer-spec sensitivity of 93dB runs about 3-4dB optimistic versus the measured 89.4dB average. Bass output drops off fairly quickly below about 50Hz in-room (F3 53Hz, F10 37Hz), so a subwoofer is needed for real low-end extension. Resonances show up around 170Hz, 220Hz, and 350Hz. On-axis, the lower treble can sound a bit bright or sibilant when the speaker is aimed directly at the listener; toeing out about 10-15° (rather than the more extreme 30°) gave the best balance, and some sidewall acoustic absorption further tamed a 4-5kHz peak. Placed close to the rear wall, bass gets boomy - pulling the speakers out about a foot resolves most of it, with roughly 1.5 feet from the wall as a good compromise between bass character and typical room aesthetics. Straying beyond about 25° above or below the mid-range axis introduces audible suckout. No longer in production, so it’s a used/secondhand purchase only. Discontinued.
Full Infinity Primus 360 review and specifications →
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 53Hz (measured, Erin's Audio Corner) |
| Crossovers | 350Hz & 3.3kHz, 24dB/octave |
| Dimensions | 39"H x 8-1/8"W x 13-7/8"D (990 x 208 x 330mm) |
| Discontinued | Yes |
| Drivers | Two 6.5" mid-woofers, 4" mid-range, 0.75" dome tweeter |
| Frequency Response | 38Hz - 20kHz (±3dB, Manufacturer specified) |
| Impedance | 8 ohms nominal, 3.5 ohms minimum (measured, Erin's Audio Corner) |
| Recommended Power | 10-200W |
| Sensitivity | 89.4dB (measured, Erin's Audio Corner; 93dB manufacturer specified) |
| Weight | 48.5 lbs (48.5 lbs / 22 kg) each |
As an eBay Partner, we may be compensated if you make a purchase.
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