Short answer: neither is clean; the ProMonitor 1000 takes more power, the Polk T15 costs less. The ProMonitor 1000’s bass distortion is well controlled, but its spinorama shows severely reduced bass energy between 40-120Hz, a directivity mismatch, and a severe resonance around 14kHz. The T15 measures better at +/-20 degrees vertical off-axis than on-axis, yet has a ‘horrific drop’ in the 3 to 6 kHz region. Both are rated below 3.0/5 among the 90 bookshelf speakers, so if sound quality matters, consider the Ascend Acoustics HTM-200SE2 instead, ranked #7 at $368.
Buy the Polk T15. It is rated higher for sound quality than the Definitive Technology ProMonitor 1000 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Polk T15 | Definitive Technology ProMonitor 1000 | |
|---|---|---|
| Price | $149.00 per pair | $498 per pair |
| Ranked | #81 of 90 in Medium Size Bookshelf Speakers | #82 of 90 in Medium Size Bookshelf Speakers |
| Drivers | 0.75” tweeter, 5.25” woofer | 1” aluminum dome tweeter, 5.25” BDSS mid/woofer, 5.25” planar bass radiator |
| Dimensions | 10.63H x 6.5W x 7.25D in | 10.88H x 6.25W x 6.5D in |
| Weight | 8.2 lbs (3.74 kg) each | 7.3 lbs (3.29 kg) each |
| Frequency Response | 60Hz - 24kHz (Manufacturer specified) | 47Hz - 30kHz (Manufacturer specified) |
| Bass Extension (-3dB) | 88.6Hz (measured, Audio Science Review) | 95Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 58.1Hz (measured, Audio Science Review) | 80Hz (measured, Audio Science Review) |
| Impedance | 8 ohms nominal | 8 ohms nominal |
| Spinorama Preference Score | 0.34 | 3.2 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 3.39 | 6.58 (spinorama.org) |
| Sensitivity | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org | 86dB (2.83V/1m, measured, Audio Science Review - reviewer noted this vs. a manufacturer spec of 91dB) |
| DIY Kit | No | No |
| Woofer Cabinet | - | passive radiator |
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- Ascend Sierra 1 v2 vs Polk T15
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- Polk T15 vs XMechanik Mechano23 DIY
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
Polk T15: $149.00 per pair Amazon eBay
Pros: Extremely affordable 2-way design that actually measured better at +/-20 degrees vertical off-axis than directly on-axis. In near-field desktop use, the reviewer found the T15 “didn’t sound that horrible,” partly because nearby desk reflections mask the frequency response dip. Measured bass extension of 88.6Hz (-3dB), with a measured sensitivity of 89dB.
Cons: Spinorama analysis reveals what Amir called a “horrific drop in upper mids/lower treble region of 3 to 6 kHz,” likely from tweeter-woofer phase cancellation directly on-axis. Measured impedance ranges from 4-8 ohms, contradicting the specified 6-8 ohm range, and there’s a distortion peak around 400Hz. On- and off-axis response “vary a ton,” making listening position unusually important. The reviewer recommends saving up for the Pioneer SP-BS22-LR instead: “I can’t justify recommending the Polk T15 even though subjective performance was not horrible.”
Full Polk T15 review and specifications →
| Bass Extension (-10dB) | 58.1Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 88.6Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 10.63H x 6.5W x 7.25D in |
| Drivers | 0.75” tweeter, 5.25” woofer |
| Frequency Response | 60Hz - 24kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Sensitivity | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org |
| Spinorama Preference Score | 0.34 |
| Spinorama Preference Score with Perfect Sub | 3.39 |
| Weight | 8.2 lbs (3.74 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Definitive Technology ProMonitor 1000: $498 per pair Amazon eBay
Pros: Bass distortion is well controlled per the measurements, and the slow bass rolloff means it can be pushed fairly hard for its size. Ships with a footer that keeps the small cabinet planted despite its light weight. Measured bass extension of 95Hz (-3dB), with a measured sensitivity of 86dB.
Cons: CEA2034 spinorama shows severely reduced bass energy between 40-120Hz, a directivity mismatch between the tweeter and woofer, and a severe resonance/interference issue around 14kHz. Distortion at 96dB SPL was so bad the reviewer limited testing to 86dB. Direct comparison to a $118/pair Pioneer SP-BS22-LR left the reviewer calling the $249/pair ProMonitor 1000 “a bad experiment that should be forgotten” and concluding “there is nothing Pro about it.”
Full Definitive Technology ProMonitor 1000 review and specifications →
| Bass Extension (-10dB) | 80Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 95Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 10.88H x 6.25W x 6.5D in |
| Drivers | 1” aluminum dome tweeter, 5.25” BDSS mid/woofer, 5.25” planar bass radiator |
| Frequency Response | 47Hz - 30kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Sensitivity | 86dB (2.83V/1m, measured, Audio Science Review - reviewer noted this vs. a manufacturer spec of 91dB) |
| Spinorama Preference Score | 3.2 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 6.58 (spinorama.org) |
| Weight | 7.3 lbs (3.29 kg) each |
| Woofer Cabinet | passive radiator |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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