Short answer: the Infinity Primus 360. It ranks #32 of 56 floorstanding speakers by sound quality at $650; the Klipsch RP-5000F II ranks #38 and costs $1199.98, so there is not much of a tradeoff to weigh.
The case for the Infinity Primus 360: 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 tradeoff: Manufacturer-spec sensitivity of 93dB runs about 3-4dB optimistic versus the measured 89.4dB average.
What the Klipsch RP-5000F II gets right: 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. The catch: Bass extension is underwhelming for a floorstander - F3 at 55Hz, F10 at 41Hz - and needs a subwoofer.
Buy the Infinity Primus 360. It ranks higher for sound quality than the Klipsch RP-5000F II and costs less, so there is no real case for the other one.
Specifications Side By Side
| Infinity Primus 360 | Klipsch RP-5000F II | |
|---|---|---|
| Price | $650.00 Discontinued | $1199.98 |
| Ranked | #32 of 56 in Large Size Floorstanding Speakers | #38 of 56 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) |
| Discontinued | Yes | - |
| Dimensions | 39"H x 8-1/8"W x 13-7/8"D (990 x 208 x 330mm) | 36.1" x 8.1" x 14.8" (917 x 207 x 375 mm) |
| Weight | 48.5 lbs (48.5 lbs / 22 kg) each | 38.6 lbs / 17.5 kg |
| Frequency Response | 38Hz - 20kHz (±3dB, Manufacturer specified) | 40Hz - 25kHz (+-3dB, Manufacturer specified) |
| Crossovers | 350Hz & 3.3kHz, 24dB/octave | - |
| Recommended Power | 10-200W | - |
| Crossover Frequency | - | 1900Hz |
| Output Power | - | 100W continuous, 400W peak |
| Woofer Cabinet | - | ported, rear |
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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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Klipsch RP-5000F II: $1199.98 Amazon
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.
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 |
| 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) |
| Output Power | 100W continuous, 400W peak |
| Sensitivity | 90dB (2.83V/1m, measured by Erin's Audio Corner) |
| Weight | 38.6 lbs / 17.5 kg |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
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