Short answer: the Infinity Primus 360 for linearity; the Klipsch RP-5000F II for tonal coherence. The Primus 360 measures within about ±2dB on-axis, though its 93dB sensitivity spec is 3-4dB optimistic against a measured 89.4dB average. The Klipsch is the most tonally coherent RP II floorstander, but its F3 of 55Hz and F10 of 41Hz are underwhelming for a tower and a subwoofer is needed.
Buy the Klipsch RP-5000F II, since the Infinity Primus 360 is discontinued and only worth hunting down used.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Infinity Primus 360 | Klipsch RP-5000F II | |
|---|---|---|
| Price | $650 per pair Discontinued | $1,199.98 per pair |
| Ranked | #40 of 74 in Large Size Floorstanding Speakers | #46 of 74 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | 41Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 55Hz (measured, Erin’s Audio Corner) |
| Drivers | Two 6.5” mid-woofers, 4” mid-range, 0.75” dome tweeter | 1” titanium tweeter with Tractrix horn, dual 5.25” cerametallic woofers |
| Sensitivity | 89.4dB (measured, Erin’s Audio Corner; 93dB manufacturer specified) | 90dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Impedance | 8 ohms nominal, 3.5 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal, 3.3 ohms minimum (measured above 80Hz, Erin’s Audio Corner) |
| Dimensions | 39” x 8.2” x 13” (990 x 208 x 330 mm) | 36.1” x 8.1” x 14.8” (917 x 207 x 375 mm) |
| Weight | 48.5 lbs (22 kg) each | 38.6 lbs (17.5 kg) |
| Frequency Response | 38Hz - 20kHz (±3dB, Manufacturer specified) | 40Hz - 25kHz (+-3dB, Manufacturer specified) |
| Crossover Frequency | 350Hz & 3.3kHz, 24dB/octave | 1900Hz |
| Recommended Power | 10-200W | - |
| Spinorama Preference Score | 4.97 | 5.24 |
| Spinorama Preference Score with Perfect Sub | 7.10 | 7.25 |
| DIY Kit | No | No |
| Power Handling | - | 100W continuous, 400W peak |
| Woofer Cabinet | - | ported, rear |
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Prices on this page were last checked October 2, 2026 at 10:18 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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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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Klipsch RP-5000F II: $1,199.98 per pair B&H Photo Video eBay
Pros: The most tonally coherent of the RP II floorstander line, with a mild baffle-step dip and treble tilt but no additional coloration issues beyond that. Precise imaging thanks to the controlled horn/waveguide directivity. Measured bass extension of 55Hz (-3dB), with a measured sensitivity of 90dB.
Cons: Bass extension is underwhelming for a floorstander (F3 at 55Hz, F10 at 41Hz) and needs a subwoofer. Narrow horizontal dispersion (~50-60 degrees) trades soundstage width for imaging precision. A mild high-frequency tilt and a slight lack of detail around 1-1.5kHz.
Full Klipsch RP-5000F II review and specifications →
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 1900Hz |
| DIY Kit | No |
| Dimensions | 36.1” x 8.1” x 14.8” (917 x 207 x 375 mm) |
| Drivers | 1” titanium tweeter with Tractrix horn, dual 5.25” cerametallic woofers |
| Frequency Response | 40Hz - 25kHz (+-3dB, Manufacturer specified) |
| Impedance | 8 ohms nominal, 3.3 ohms minimum (measured above 80Hz, Erin’s Audio Corner) |
| Power Handling | 100W continuous, 400W peak |
| Sensitivity | 90dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 5.24 |
| Spinorama Preference Score with Perfect Sub | 7.25 |
| Weight | 38.6 lbs (17.5 kg) |
| Woofer Cabinet | ported, rear |
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