Short answer: the Philharmonic BMR Monitor on measured sound quality, the XTZ Spirit 4 on price. The Philharmonic BMR Monitor ranks #134 of 222 bookshelf speakers, rated 3.6/5, at $2,200. The XTZ Spirit 4 ranks #159, rated 3.4/5, at $477, $1,723 cheaper.
What the XTZ Spirit 4 does well: Stand-mount speakers with a waveguide tweeter, adjustable treble and port tuning, wide coverage and fairly deep bass. The catch: The third-party measurement is low confidence.
The Philharmonic BMR Monitor is the more accurate, deeper-bass option. Three-way bookshelf speakers with premium drivers, a well-built cabinet and extremely wide dispersion for a broad soundstage. Its measured preference score, a predictor of how neutral it sounds, is 6.02 against 4.18 for the XTZ Spirit 4. Its bass reaches about 32Hz before falling 10dB, against 40Hz for the XTZ Spirit 4. The tradeoff: A 1-2dB bump around 2-3kHz creates a “glare” on vocals, guitars, and strings that the reviewer noticed consistently across many tracks.
Buy the XTZ Spirit 4 if the price is the priority over sound quality, or the Philharmonic BMR Monitor if sound quality is the priority over the price.
Still deciding? The full Passive Home rankings cover every ranked option.
Stand-mount speakers with a waveguide tweeter, adjustable treble and port tuning, wide coverage and fairly deep bass.
Three-way bookshelf speakers with premium drivers, a well-built cabinet and extremely wide dispersion for a broad soundstage.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| XTZ Spirit 4 | Philharmonic BMR Monitor | |
|---|---|---|
| Price | $477 per pair | $2200 per pair |
| Ranked | #159 of 222 in Large Size Bookshelf Speakers | #134 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | about 40.0Hz (measured, Spinorama data) | 32Hz (measured, Erin’s Audio Corner) |
| Enclosure | 2-way passive, rear-ported | - |
| Drivers | 1” dome tweeter, 6.5” woofer | 6” Ceramic woofer, Balanced Mode Radiator 2.5” midrange, RAAL 64-10X OEM tweeter |
| Dimensions | 13.8H x 7.5W x 10.6D in | 20”H x 8”W x 12.5”D (508 x 203.2 x 317.5 mm) |
| Weight | 17.9 lbs (8.1 kg) each | 32 lbs (14.5 kg) each |
| Sensitivity | 86dB | 84dB (measured, Erin’s Audio Corner) |
| Impedance | 4 ohms | 4 ohms nominal (3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 4.18 | 6.02 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 6.30 | 7.67 (spinorama.org) |
| Bass Extension (-3dB) | 42Hz (manufacturer specified) | 47Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No | No |
| Woofer Cabinet | - | ported, rear |
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