Short answer: the Klipsch RP-8000F II for dynamics; the Infinity Primus 360 for measured linearity. The Klipsch is the most sensitive RP II floorstander at about 92dB measured and the cleanest under load, but mid-bass is lean despite dual 8-inch woofers and it did not reach the expected 50Hz in-room. The Primus 360 stays within about ±2dB on-axis, with a 93dB spec against 89.4dB measured.
Buy the Klipsch RP-8000F II, since the Infinity Primus 360 is discontinued and only worth hunting down used.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Infinity Primus 360 | Klipsch RP-8000F II | |
|---|---|---|
| Price | $650 per pair Discontinued | $1,159.98 per pair |
| Ranked | #40 of 74 in Large Size Floorstanding Speakers | #49 of 74 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | 33Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 67Hz (measured, Erin’s Audio Corner) |
| Drivers | Two 6.5” mid-woofers, 4” mid-range, 0.75” dome tweeter | 1” titanium tweeter with 90x90 Tractrix horn, dual 8” cerametallic woofers |
| Sensitivity | 89.4dB (measured, Erin’s Audio Corner; 93dB manufacturer specified) | 92dB (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 (3.7 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Dimensions | 39” x 8.2” x 13” (990 x 208 x 330 mm) | 43.1” x 10.8” x 18.3” (1095 x 275 x 464 mm) |
| Weight | 48.5 lbs (22 kg) each | 61.3 lbs (27.8 kg) |
| Frequency Response | 38Hz - 20kHz (±3dB, Manufacturer specified) | 35Hz - 25kHz (+-3dB, Manufacturer specified) |
| Crossover Frequency | 350Hz & 3.3kHz, 24dB/octave | 1630Hz |
| Recommended Power | 10-200W | - |
| Spinorama Preference Score | 4.97 | 5.39 |
| Spinorama Preference Score with Perfect Sub | 7.10 | 7.12 |
| DIY Kit | No | No |
| Power Handling | - | 150W continuous, 600W 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-8000F II: $1,159.98 per pair Amazon eBay
Pros: Highest sensitivity of the RP II floorstander line (~92dB measured) and the best dynamics/compression behavior of the three under load: the cleanest at high output. Dual 8-inch woofers and the highest power handling in the line. Measured bass extension of 67Hz (-3dB), with a measured sensitivity of 92dB.
Cons: Mid-bass sounds lean despite the dual 8-inch woofers, and bass extension disappointed for its size: expected to reach 50Hz, didn’t get there in-room. Has its own edgy upper-mid bump (2-6kHz) that’s harder to EQ out than the other two models’ issues, since it stems from the vertical horn/woofer offset rather than simple tonal balance. The most placement-critical of the three, with the narrowest horizontal (~40-50 degrees) and vertical (+5/-10 degrees) dispersion.
Full Klipsch RP-8000F II review and specifications →
| Bass Extension (-10dB) | 33Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 67Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 1630Hz |
| DIY Kit | No |
| Dimensions | 43.1” x 10.8” x 18.3” (1095 x 275 x 464 mm) |
| Drivers | 1” titanium tweeter with 90x90 Tractrix horn, dual 8” cerametallic woofers |
| Frequency Response | 35Hz - 25kHz (+-3dB, Manufacturer specified) |
| Impedance | 8 ohms nominal (3.7 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Power Handling | 150W continuous, 600W peak |
| Sensitivity | 92dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 5.39 |
| Spinorama Preference Score with Perfect Sub | 7.12 |
| Weight | 61.3 lbs (27.8 kg) |
| Woofer Cabinet | ported, rear |
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