Short answer: the Definitive Technology ProMonitor 1000, though neither ranks well in its class. It ranks #156 of 168 bookshelf speakers by sound quality, rated 1.7/5, at $398.40. The Klipsch Reference R-40M ranks #164, rated 1.4/5, at $199.99, $198.41 cheaper, a saving that is not big enough to make up the sound-quality gap. Both are rated below 3.0/5 among the 168 bookshelf speakers; for better sound, the Ascend Acoustics HTM-200SE2 ranks #7 at $368.
The Definitive Technology ProMonitor 1000 is the better-sounding option. Bass distortion is well controlled per the measurements, and the slow bass rolloff means it can be pushed fairly hard for its size. The tradeoff: 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.
The case for the Klipsch Reference R-40M: The current next-generation 4-inch passive bookshelf speaker replacing the Klipsch R-41M. Watch for: Awaiting published full NFS preference scores.
Buy the Definitive Technology ProMonitor 1000. It is rated higher for sound quality, and the $198.41 saving on the Klipsch Reference R-40M is not enough to make up the difference.
About the ratings: the Klipsch Reference R-40M’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 1.2 to 1.6, so this verdict could change once it is measured.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Definitive Technology ProMonitor 1000 | Klipsch Reference R-40M | |
|---|---|---|
| Price | $398.40 per pair | $199.99 per pair Passive |
| Ranked | #156 of 168 in Medium Size Bookshelf Speakers | #164 of 168 in Medium Size Bookshelf Speakers Estimated |
| Bass Extension (-3dB) | 95Hz (measured, Audio Science Review) | - |
| Bass Extension (-10dB) | 80Hz (measured, Audio Science Review) | - |
| Drivers | 1” aluminum dome tweeter, 5.25” BDSS mid/woofer, 5.25” planar bass radiator | 1” aluminum LTS tweeter on edge-to-edge Tractrix horn, 4” spun-copper TCP woofer |
| Dimensions | 10.88H x 6.25W x 6.5D in | 11.7” x 5.7” x 8.5” (298 x 146 x 216 mm) |
| Weight | 7.3 lbs (3.29 kg) each | 7.1 lbs (3.2 kg) each |
| Frequency Response | 47Hz - 30kHz (Manufacturer specified) | 71Hz - 21kHz (+/- 3dB, Manufacturer specified) |
| Sensitivity | 86dB (2.83V/1m, measured, Audio Science Review - reviewer noted this vs. a manufacturer spec of 91dB) | 91dB (2.83V @ 1m) |
| Impedance | 8 ohms nominal | 8 ohms |
| Woofer Cabinet | passive radiator | - |
| Spinorama Preference Score | 3.2 (spinorama.org) | - |
| Spinorama Preference Score with Perfect Sub | 6.58 (spinorama.org) | - |
| DIY Kit | No | - |
| Crossover Frequency | - | 1770Hz |
| Passive | - | Yes |
Related Speaker Comparisons
How Definitive Technology ProMonitor 1000 compares with other leading options:
- Ascend Acoustics Sierra 1 v2 vs Definitive Technology ProMonitor 1000
- KEF LS50 Meta vs Definitive Technology ProMonitor 1000
- Arendal 1961 Monitor vs Definitive Technology ProMonitor 1000
- Klipsch RP-500M II vs Definitive Technology ProMonitor 1000
- Wharfedale Super Denton vs Definitive Technology ProMonitor 1000
Prices on this page were last checked October 11, 2026 at 4:59 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
Definitive Technology ProMonitor 1000: $398.40 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 $199/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
- Definitive Technology ProMonitor 1000 vs Sehlin Helium
- Definitive Technology ProMonitor 1000 vs Klipsch Reference R-50M
- Definitive Technology ProMonitor 1000 vs Polk T15
- Definitive Technology ProMonitor 1000 vs Pioneer Elite SP-EBS73-LR
- Definitive Technology ProMonitor 1000 vs JBL Control 1 Pro
- Definitive Technology ProMonitor 1000 vs Klipsch R-51M
- Definitive Technology ProMonitor 1000 vs Fluance Signature HFS
- Definitive Technology ProMonitor 1000 vs JBL Stage A130
- See all 35 comparisons
Klipsch Reference R-40M: $199.99 per pair Passive Estimated Amazon eBay
Older model: the Klipsch R-41M (ranked lower, rated 1.3/5). See every Klipsch Reference generation.
Same family: the Klipsch Reference R-50M (larger bookshelf, ranked higher, estimated 1.7/5), the Klipsch Reference R-600F (smaller floorstanding, estimated 1.8/5), the Klipsch Reference R-800F (larger floorstanding, estimated 1.9/5), the Klipsch Reference R-30C (smaller center, estimated 3.4/5) and the Klipsch Reference R-50C (larger center, estimated 3.5/5).
Pros: The current next-generation 4-inch passive bookshelf speaker replacing the Klipsch R-41M. Features the updated edge-to-edge Tractrix horn mated to a 1-inch aluminum LTS tweeter and 4-inch spun-copper TCP woofer. High sensitivity (91dB) ensures easy drivability with any entry receiver.
Cons: Awaiting published full NFS preference scores. 4-inch woofer has natural bass roll-off below 71Hz, requiring a companion subwoofer for full-range listening.
Full Klipsch Reference R-40M review and specifications →
| Released | 2022 (4 years ago) |
|---|---|
| Crossover Frequency | 1770Hz |
| Dimensions | 11.7” x 5.7” x 8.5” (298 x 146 x 216 mm) |
| Drivers | 1” aluminum LTS tweeter on edge-to-edge Tractrix horn, 4” spun-copper TCP woofer |
| Frequency Response | 71Hz - 21kHz (+/- 3dB, Manufacturer specified) |
| Impedance | 8 ohms |
| Passive | Yes |
| Sensitivity | 91dB (2.83V @ 1m) |
| Weight | 7.1 lbs (3.2 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons