Short answer: the Magnepan LRS+, if you are buying new. The Infinity Primus 360 ranks higher than it (#77 vs #149 of 188 floorstanding speakers, 4.2/5 vs 3.5/5) but is discontinued, so only consider it used; the Magnepan LRS+ is still sold new at $1,300.
What the Magnepan LRS+ does well: Thin, two-way planar-magnetic open-baffle/dipole panel design (about 48” tall, just 1” deep). The tradeoff: Extremely current-hungry and power-hungry: even a pair of 600W Macintosh monoblock amplifiers only averaged about 90dB output.
The Infinity Primus 360 is the more accurate, deeper-bass choice. Its measured preference score, a predictor of how neutral it sounds, is 4.97 against 1.27 for the Magnepan LRS+. Its bass reaches about 53Hz before falling 3dB, against 74Hz for the Magnepan LRS+. The tradeoff: Manufacturer-spec sensitivity of 93dB runs about 3-4dB optimistic versus the measured 89.4dB average.
Buy the Magnepan LRS+ new; the Infinity Primus 360 is no longer sold new, so it only makes sense as a used find.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Magnepan LRS+ | Infinity Primus 360 | |
|---|---|---|
| Price | $1300 per pair | $650 per pair Discontinued |
| Ranked | #149 of 188 in Large Size Floorstanding Speakers | #77 of 188 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 67Hz (measured, Erin’s Audio Corner) | 37Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 74Hz (measured, Erin’s Audio Corner) | 53Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 85.1dB (measured, Erin’s Audio Corner) | 89.4dB (measured, Erin’s Audio Corner; 93dB manufacturer specified) |
| Drivers | Full-range planar magnetic dipole panel (48” tall x 13.5” wide); quasi-ribbon design, two-way with separate mid/bass and tweeter ribbon sections | Two 6.5” mid-woofers, 4” mid-range, 0.75” dome tweeter |
| Weight | 30 lbs (13.6 kg) | 48.5 lbs (22 kg) each |
| Woofer Cabinet | open baffle | - |
| Impedance | 4 ohms nominal, 3 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal, 3.5 ohms minimum (measured, Erin’s Audio Corner) |
| Dimensions | 48”H x 13.5”W x 1”D (1219.2 x 342.9 x 25.4 mm) | 39” x 8.2” x 13” (990 x 208 x 330 mm) |
| Spinorama Preference Score | 1.27 | 4.97 |
| Spinorama Preference Score with Perfect Sub | 4.32 | 7.10 |
| DIY Kit | No | No |
| Frequency Response | - | 38Hz - 20kHz (±3dB, Manufacturer specified) |
| Crossover Frequency | - | 350Hz & 3.3kHz, 24dB/octave |
| Recommended Power | - | 10-200W |
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Prices on this page were last checked October 9, 2026 at 8:01 AM 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
Magnepan LRS+: $1300 per pair Magnepan eBay
Pros: Thin, two-way planar-magnetic open-baffle/dipole panel design (about 48” tall, just 1” deep). Delivers a uniquely dramatic and enveloping soundstage with genuinely three-dimensional depth effects that work across all music genres, not just classical or orchestral material as commonly assumed. Extremely tight, locked-in center-phantom imaging when set up correctly. Open-baffle design avoids the “boxy” enclosure coloration of conventional cabinet speakers. Multitone distortion is remarkably consistent from low to high frequency, a characteristic the reviewer hasn’t observed in conventional cone-and-dome speakers. Compression at high output stays modest (about 0.5-1dB) through the midrange and treble, giving roughly 20-26dB of usable dynamic range in that region. At its price, a strong contender for a dedicated secondary listening room, even if not a main-system replacement. Measured bass extension of 74Hz (-3dB), with a measured sensitivity of 85.1dB.
Cons: Extremely current-hungry and power-hungry: even a pair of 600W Macintosh monoblock amplifiers only averaged about 90dB output. A robust, high-power amplifier is essentially mandatory, and budget amps won’t cut it. Bass rolls off very quickly (F3 74Hz, F10 67Hz, described as falling off “like a rock”), making a subwoofer an absolute requirement for any low-end content. A roughly 3dB dip in the mid-bass (100-300Hz) region thins out vocal body and fullness compared to a conventional bookshelf speaker. A resonance/bump around 400Hz adds a mild boxy quality, though it responds well to about 2dB of EQ correction. Extraordinarily fussy about exact positioning: both seating height (must align with the acoustic reference point between the panel’s lower tie-down points) and horizontal aiming are unusually critical; moving just a couple of inches can cause treble content above roughly 500-600Hz to nearly vanish. Distinct off-axis cancellation zones exist directly to the sides of the panel, where very little sound is audible at all. Fails badly under extreme dynamic-transient testing in the bass, and the reviewer blew fuses pushing the speaker during testing: not built for high-volume or highly dynamic playback. A genuinely different category from conventional hi-fi speakers, requiring more setup patience and experimentation than a typical monopole design.
Full Magnepan LRS+ review and specifications →
| Bass Extension (-10dB) | 67Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 74Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 48”H x 13.5”W x 1”D (1219.2 x 342.9 x 25.4 mm) |
| Drivers | Full-range planar magnetic dipole panel (48” tall x 13.5” wide); quasi-ribbon design, two-way with separate mid/bass and tweeter ribbon sections |
| Impedance | 4 ohms nominal, 3 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 85.1dB (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 1.27 |
| Spinorama Preference Score with Perfect Sub | 4.32 |
| Weight | 30 lbs (13.6 kg) |
| Woofer Cabinet | open baffle |
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Infinity Primus 360: $650 per pair Discontinued eBay
Same family: the Infinity Primus 150 (bookshelf, rated 3.4/5).
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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