Short answer: the Ascend CBM-170 SE2. It ranks #66 of 130 bookshelf speakers by sound quality; the Mission LX-3 MKII ranks #80.
What the Ascend CBM-170 SE2 offers: On-axis response is impressively flat from about 100Hz to 2kHz, staying within roughly ±1dB, with a clean, gradual bass rolloff below that. The directivity index rises smoothly and predictably through the crossover region, and the estimated in-room response shows a smooth, consistent downward tilt from 100Hz to 10kHz with no major discontinuities - close to the ideal in-room target shape. Measured sensitivity of 86.8dB nearly matches Ascend’s 87dB spec. The manufacturer’s own preference-score modeling comes out to 5.81 unequalized (rising to 8.17 with an ideal subwoofer, or 6.33/8.41 with EQ applied) - a strong result for a compact 2-way, and a clear step up from the original CBM-170 SE this replaces. Watch for: A narrow dip in the on-axis and listening-window response appears in the 3-5kHz range (down to about -2.7dB), mirrored by a matching dip in the directivity index at the same frequencies - likely a brief widening of dispersion right at the tweeter/woofer crossover. High-frequency directivity narrows substantially above 10kHz, typical for a small dome tweeter, so the top octave will sound more reserved off-axis than on-axis. Bass rolls off as expected for a compact 2-way monitor: -3dB around 70Hz and -10dB around 50Hz, so a subwoofer is needed for full-range use. This data comes from the manufacturer’s own Klippel measurements rather than an independent third-party review, so there’s no outside verification of channel matching, distortion, or unit-to-unit consistency.
What the Mission LX-3 MKII offers: A large affordable standmount with a 6.5-inch woofer, 88dB rated sensitivity and useful bass. ASR measured 48Hz estimated in-room extension, a controlled Q of 0.60, a 5.52 subwoofer-assisted preference score and reasonable +/-55-degree horizontal coverage. Watch for: On-axis smoothness of 0.217 and predicted in-room smoothness of 0.344 reveal clear response unevenness, with a -0.46dB-per-octave downward tilt. The 345mm-tall, 8.4kg cabinet is bulky and current US availability is limited.
Buy the Ascend CBM-170 SE2 when sound quality outweighs the price for you, and the Mission LX-3 MKII when the price outweighs sound quality instead.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Ascend CBM-170 SE2 | Mission LX-3 MKII | |
|---|---|---|
| Price | $468 per pair | £249 per pair |
| Ranked | #66 of 130 in Large Size Bookshelf Speakers | #80 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | 70Hz (measured, manufacturer spinorama data) | - |
| Bass Extension (-10dB) | 50Hz (measured, manufacturer spinorama data) | - |
| Sensitivity | 86.8dB (2.83V/1m, measured, manufacturer spinorama data; 87dB manufacturer specified) | 88dB |
| Drivers | 27mm custom SEAS soft dome tweeter, 6.5" proprietary composite polygel cone woofer | 1" microfiber-dome tweeter, 6.5" composite-fiber woofer |
| Dimensions | 12H x 9W x 9.5D in | 13.6H x 8.9W x 12.1D in |
| Weight | 15 lbs (6.8 kg) each | 18.5 lbs (8.4 kg) each |
| Impedance | 8 ohms | 8 ohms nominal, 4.1 ohms minimum |
| Power Handling | 200W continuous, 400W peak | - |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 5.81 | 3.26 |
| Spinorama Preference Score with Perfect Sub | 8.17 | 5.52 |
| Enclosure | - | 2-way, bass-reflex |
| Country | - | United Kingdom (design) |
Related Speaker Comparisons
More worthwhile head-to-heads for Ascend CBM-170 SE2:
- Ascend CBM-170 SE2 vs Perlisten S4b
- Ascend CBM-170 SE2 vs KEF Reference 1 Meta
- Ascend CBM-170 SE2 vs GR-Research NX-Studio
- AsciLab C6B vs Ascend CBM-170 SE2
- Ascend CBM-170 SE2 vs Audio First Cadentia 3
Prices on this page were last checked September 16, 2026 at 12:41 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
Ascend CBM-170 SE2: $468 per pair Ascend Acoustics eBay
Pros: On-axis response is impressively flat from about 100Hz to 2kHz, staying within roughly ±1dB, with a clean, gradual bass rolloff below that. The directivity index rises smoothly and predictably through the crossover region, and the estimated in-room response shows a smooth, consistent downward tilt from 100Hz to 10kHz with no major discontinuities - close to the ideal in-room target shape. Measured sensitivity of 86.8dB nearly matches Ascend’s 87dB spec. The manufacturer’s own preference-score modeling comes out to 5.81 unequalized (rising to 8.17 with an ideal subwoofer, or 6.33/8.41 with EQ applied) - a strong result for a compact 2-way, and a clear step up from the original CBM-170 SE this replaces. Measured sensitivity of 86.8dB.
Cons: A narrow dip in the on-axis and listening-window response appears in the 3-5kHz range (down to about -2.7dB), mirrored by a matching dip in the directivity index at the same frequencies - likely a brief widening of dispersion right at the tweeter/woofer crossover. High-frequency directivity narrows substantially above 10kHz, typical for a small dome tweeter, so the top octave will sound more reserved off-axis than on-axis. Bass rolls off as expected for a compact 2-way monitor: -3dB around 70Hz and -10dB around 50Hz, so a subwoofer is needed for full-range use. This data comes from the manufacturer’s own Klippel measurements rather than an independent third-party review, so there’s no outside verification of channel matching, distortion, or unit-to-unit consistency.
Full Ascend CBM-170 SE2 review and specifications →
| Bass Extension (-10dB) | 50Hz (measured, manufacturer spinorama data) |
|---|---|
| Bass Extension (-3dB) | 70Hz (measured, manufacturer spinorama data) |
| Dimensions | 12H x 9W x 9.5D in |
| Drivers | 27mm custom SEAS soft dome tweeter, 6.5" proprietary composite polygel cone woofer |
| Impedance | 8 ohms |
| Power Handling | 200W continuous, 400W peak |
| Sensitivity | 86.8dB (2.83V/1m, measured, manufacturer spinorama data; 87dB manufacturer specified) |
| Spinorama Preference Score | 5.81 |
| Spinorama Preference Score with Perfect Sub | 8.17 |
| Weight | 15 lbs (6.8 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend CBM-170 SE2 vs Polk Signature Elite ES20
- Ascend CBM-170 SE2 vs Dynaudio Contour 20i
- Ascend CBM-170 SE2 vs Klipsch RP-600M II
- Ascend CBM-170 SE2 vs Dynaudio Emit 20
- Ascend CBM-170 SE2 vs Philharmonic BMR Monitor
- Ascend CBM-170 SE2 vs ELAC DBR62
- Ascend CBM-170 SE2 vs GR-Research X-LS Encore
- Ascend CBM-170 SE2 vs Dynaudio Special Forty
- See all 44 comparisons
Mission LX-3 MKII: £249 per pair Richer Sounds eBay
Pros: A large affordable standmount with a 6.5-inch woofer, 88dB rated sensitivity and useful bass. ASR measured 48Hz estimated in-room extension, a controlled Q of 0.60, a 5.52 subwoofer-assisted preference score and reasonable +/-55-degree horizontal coverage.
Cons: On-axis smoothness of 0.217 and predicted in-room smoothness of 0.344 reveal clear response unevenness, with a -0.46dB-per-octave downward tilt. The 345mm-tall, 8.4kg cabinet is bulky and current US availability is limited.
Full Mission LX-3 MKII review and specifications →
| Country | United Kingdom (design) |
|---|---|
| Dimensions | 13.6H x 8.9W x 12.1D in |
| Drivers | 1" microfiber-dome tweeter, 6.5" composite-fiber woofer |
| Enclosure | 2-way, bass-reflex |
| Impedance | 8 ohms nominal, 4.1 ohms minimum |
| Sensitivity | 88dB |
| Spinorama Preference Score | 3.26 |
| Spinorama Preference Score with Perfect Sub | 5.52 |
| Weight | 18.5 lbs (8.4 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Mission LX-3 MKII vs GR-Research X-LS Encore
- Mission LX-3 MKII vs Philharmonic BMR Monitor
- Mission LX-3 MKII vs Dynaudio Emit 20
- Mission LX-3 MKII vs Klipsch RP-600M II
- Mission LX-3 MKII vs Dynaudio Special Forty
- Mission LX-3 MKII vs ELAC Debut 2.0 B6.2
- Mission LX-3 MKII vs SVS Prime Bookshelf
- Mission LX-3 MKII vs KEF Q3 Meta
- See all 44 comparisons