Short answer: the Infinity Primus 360. It ranks #32 of 56 floorstanding speakers by sound quality at $650; the SVS Ultra Evolution Pinnacle ranks #39 and costs $4999.98, so there is not much of a tradeoff to weigh.
What the Infinity Primus 360 gets right: 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. The catch: Manufacturer-spec sensitivity of 93dB runs about 3-4dB optimistic versus the measured 89.4dB average.
The case for the SVS Ultra Evolution Pinnacle: A large curved-baffle tower built for time alignment: a 1” dome tweeter flanked by two 5.25” midranges above two 8” mid-bass drivers, plus a matching pair of 8” drivers and dual ports on the back. The tradeoff: Not a fully linear speaker: a dip in the upper midrange followed closely by a peak (roughly 2-3kHz) gives vocals and other midrange content a shouty, forward quality that toe-out alone doesn’t resolve.
Buy the Infinity Primus 360. It ranks higher for sound quality than the SVS Ultra Evolution Pinnacle and costs less, so there is no real case for the other one.
Specifications Side By Side
| Infinity Primus 360 | SVS Ultra Evolution Pinnacle | |
|---|---|---|
| Price | $650.00 Discontinued | $4,999.98 |
| Ranked | #32 of 56 in Large Size Floorstanding Speakers | #39 of 56 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | 27Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 40Hz (measured, Erin’s Audio Corner) |
| Drivers | Two 6.5" mid-woofers, 4" mid-range, 0.75" dome tweeter | 1" dome tweeter, two 5.25" midranges, four 8" mid-bass drivers (2 front, 2 rear) |
| Sensitivity | 89.4dB (measured, Erin’s Audio Corner; 93dB manufacturer specified) | 88.1dB (measured, Erin’s Audio Corner) |
| Impedance | 8 ohms nominal, 3.5 ohms minimum (measured, Erin’s Audio Corner) | 6 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) |
| Discontinued | Yes | - |
| Dimensions | 39"H x 8-1/8"W x 13-7/8"D (990 x 208 x 330mm) | 49"H x 12"W x 18"D (1245.0 x 305.0 x 457.0 mm) |
| Weight | 48.5 lbs (48.5 lbs / 22 kg) each | 100.1 lbs / 45.4 kg (100 lb) each |
| Frequency Response | 38Hz - 20kHz (±3dB, Manufacturer specified) | 24Hz - 40kHz (±3dB, Manufacturer specified) |
| Crossovers | 350Hz & 3.3kHz, 24dB/octave | 140Hz & 1.8kHz |
| Recommended Power | 10-200W | 20-300W |
| Woofer Cabinet | - | ported, rear (dual) |
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The Two Speakers In Full
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 |
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SVS Ultra Evolution Pinnacle: $4,999.98 SVS
Pros: A large curved-baffle tower built for time alignment: a 1” dome tweeter flanked by two 5.25” midranges above two 8” mid-bass drivers, plus a matching pair of 8” drivers and dual ports on the back. Impulse-response testing shows a single clean arrival rather than the staggered tweeter-then-woofer arrival typical of conventional flat-baffle designs, confirming genuinely effective time alignment. Excellent build quality throughout. Very wide, consistent horizontal radiation around ±70-80° gives a large, enveloping soundstage. Capable of very high output with very low harmonic distortion - the reviewer says this measured the lowest harmonic distortion of any speaker he has tested to date, at both 86dB and 96dB output, with distortion staying under 1% down to 40Hz.
Cons: Not a fully linear speaker: a dip in the upper midrange followed closely by a peak (roughly 2-3kHz) gives vocals and other midrange content a shouty, forward quality that toe-out alone doesn’t resolve, pointing to a genuine on-axis response issue rather than just room reflections. A wide, high-Q bass bump around 70-80Hz makes the speaker sound boomy unless pulled at least 3 feet from the rear wall or tamed with EQ (a -3dB cut with a Q of 1 around 70Hz worked well in testing). Minimum impedance dips to about 2.6 ohms around 80Hz, a genuinely demanding load - the reviewer could not drive these to satisfying output with budget-oriented amplifiers and receivers, and recommends a robust stereo amp or monoblocks instead. At around 100 lbs and roughly 4 feet tall with the tweeter about 32.5” off the ground, seating position matters: straying beyond about 10° of the tweeter axis loses real detail in the upper midrange, and the crossover region shows lobing that shifts from about 10° to 50° between 2-4kHz. Multitone distortion and dynamic compression both increase in that same upper-midrange/tweeter region at higher output, consistent with the on-axis dip-then-peak character.
Full SVS Ultra Evolution Pinnacle review and specifications →
| Bass Extension (-10dB) | 27Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 40Hz (measured, Erin's Audio Corner) |
| Crossovers | 140Hz & 1.8kHz |
| Dimensions | 49"H x 12"W x 18"D (1245.0 x 305.0 x 457.0 mm) |
| Drivers | 1" dome tweeter, two 5.25" midranges, four 8" mid-bass drivers (2 front, 2 rear) |
| Frequency Response | 24Hz - 40kHz (±3dB, Manufacturer specified) |
| Impedance | 6 ohms nominal, 2.6 ohms minimum (measured, Erin's Audio Corner) |
| Recommended Power | 20-300W |
| Sensitivity | 88.1dB (measured, Erin's Audio Corner) |
| Weight | 100.1 lbs / 45.4 kg (100 lb) each |
| Woofer Cabinet | ported, rear (dual) |
As an eBay Partner, we may be compensated if you make a purchase.
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