Short answer: the Infinity Primus 360 for a flatter on-axis curve; the SVS Ultra Evolution Pinnacle for a time-aligned driver array. The Primus 360 holds within about ±2dB on-axis, though its 93dB spec is 3-4dB optimistic against a measured 89.4dB average. The SVS tower’s upper-midrange dip and roughly 2-3kHz peak give vocals a shouty quality that toe-out alone does not fix.
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 SVS Ultra Evolution Pinnacle if you want one new; the Infinity Primus 360 is discontinued, so only look for it used.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Infinity Primus 360 | SVS Ultra Evolution Pinnacle | |
|---|---|---|
| Price | $650 per pair Discontinued | $2,499.00 per pair |
| Ranked | #40 of 74 in Large Size Floorstanding Speakers | #53 of 74 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 41.0Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Drivers | Two 6.5” mid-woofers, 4” mid-range, 0.75” dome tweeter | 1” diamond-coated tweeter, dual 5.25” midranges, quad 8” woofers |
| Sensitivity | 89.4dB (measured, Erin’s Audio Corner; 93dB manufacturer specified) | 88dB |
| Impedance | 8 ohms nominal, 3.5 ohms minimum (measured, Erin’s Audio Corner) | 6 ohms nominal |
| Dimensions | 39” x 8.2” x 13” (990 x 208 x 330 mm) | 50.2H x 11.8W x 18.1D in |
| Weight | 48.5 lbs (22 kg) each | 96.8 lbs (43.9 kg) each |
| Frequency Response | 38Hz - 20kHz (±3dB, Manufacturer specified) | - |
| Crossover Frequency | 350Hz & 3.3kHz, 24dB/octave | - |
| Recommended Power | 10-200W | - |
| Spinorama Preference Score | 4.97 | 4.91 |
| Spinorama Preference Score with Perfect Sub | 7.10 | 6.13 |
| DIY Kit | No | No |
| Enclosure | - | 3-way passive, dual rear ports |
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The Two Speakers In Full
Infinity Primus 360: $650 per pair Discontinued eBay
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. Measured bass extension of 53Hz (-3dB), with a measured sensitivity of 89.4dB.
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.
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) |
| Crossover Frequency | 350Hz & 3.3kHz, 24dB/octave |
| DIY Kit | No |
| Dimensions | 39” x 8.2” x 13” (990 x 208 x 330 mm) |
| 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) |
| Spinorama Preference Score | 4.97 |
| Spinorama Preference Score with Perfect Sub | 7.10 |
| Weight | 48.5 lbs (22 kg) each |
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SVS Ultra Evolution Pinnacle: $2,499.00 per pair Amazon SVS eBay
Pros: Flagship three-way tower with a diamond-coated tweeter, dual midranges and four force-balanced 8-inch woofers. Erin measured exceptional 27Hz extension, broad roughly +/-75-degree horizontal coverage, an 88.1dB sensitivity and a 4.91 preference score even without a subwoofer. Measured bass extension of 41.0Hz (-3dB).
Cons: The 5.25-to-8-inch transitions and complex array do not produce class-leading smoothness: 0.184 on-axis, 0.226 predicted in-room and 3.64 directivity-index consistency. At 96.7 pounds each, these are difficult to position, and their Q of 1.25 indicates some bass emphasis. A dip in the upper midrange followed closely by a peak around 2 to 3kHz gives vocals a shouty, forward quality that toe-out alone does not resolve.
Full SVS Ultra Evolution Pinnacle review and specifications →
| Bass Extension (-3dB) | 41.0Hz (measured, Erin’s Audio Corner via spinorama.org) |
|---|---|
| DIY Kit | No |
| Dimensions | 50.2H x 11.8W x 18.1D in |
| Drivers | 1” diamond-coated tweeter, dual 5.25” midranges, quad 8” woofers |
| Enclosure | 3-way passive, dual rear ports |
| Impedance | 6 ohms nominal |
| Sensitivity | 88dB |
| Spinorama Preference Score | 4.91 |
| Spinorama Preference Score with Perfect Sub | 6.13 |
| Weight | 96.8 lbs (43.9 kg) each |
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