Ascend Acoustics CMT-340 SE2 vs Mission LX-3 MKII

Last updated: September 16, 2026

Short answer: the Ascend Acoustics CMT-340 SE2. It ranks #23 of 130 bookshelf speakers by sound quality; the Mission LX-3 MKII ranks #80.

Ascend Acoustics CMT-340 SE2 vs Mission LX-3 MKII

What the Ascend Acoustics CMT-340 SE2 offers: High-quality manufacturer Klippel NFS data shows 0.295dB on-axis average absolute deviation, 0.531 listening-window smoothness, and a strong 7.17 preference score with a subwoofer. Its dual 6.5-inch woofers, 92dB anechoic sensitivity, and 240W continuous power rating support high output and dynamics. Watch for: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 4.51. The 4.35 sound-power directivity-index standard deviation also indicates more off-axis variation than the strongest designs, and the rear port needs placement clearance.

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 Acoustics CMT-340 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.

Buy the Ascend Acoustics CMT-340 SE2 at Ascend Acoustics ($798/pair) →Buy the Mission LX-3 MKII at Richer Sounds (£249/pair) →

Specifications Side By Side

Ascend Acoustics CMT-340 SE2 Mission LX-3 MKII
Price$798 per pair£249 per pair
Ranked#23 of 130 in Large Size Bookshelf Speakers#80 of 130 in Large Size Bookshelf Speakers
Bass Extension (-3dB)77.6Hz (measured, spinorama.org)-
Bass Extension (-10dB)approximately 53Hz (measured, spinorama.org)-
DriversTwo 6.5-inch woofers; 27mm soft-dome tweeter1" microfiber-dome tweeter, 6.5" composite-fiber woofer
Sensitivity92dB at 2.83V/1m anechoic88dB
Impedance8 ohms nominal8 ohms nominal, 4.1 ohms minimum
Power Handling240W continuous; 400W short-term peak-
Dimensions21 x 7.5 x 10.5 in each13.6H x 8.9W x 12.1D in
Weight29.1 lbs (13.2 kg) each18.5 lbs (8.4 kg) each
Spinorama Preference Score4.513.26
Spinorama Preference Score with Perfect Sub7.175.52
Enclosure-2-way, bass-reflex
Country-United Kingdom (design)
Buy the Ascend Acoustics CMT-340 SE2 at Ascend Acoustics ($798/pair) →Buy the Mission LX-3 MKII at Richer Sounds (£249/pair) →

How Ascend Acoustics CMT-340 SE2 compares with other leading options:

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.

As an eBay Partner, we may be compensated if you make a purchase.

The Two Speakers In Full

Ascend Acoustics CMT-340 SE2: $798 per pair Ascend Acoustics eBay

Ascend Acoustics CMT-340 SE2 ranking card

Pros: High-quality manufacturer Klippel NFS data shows 0.295dB on-axis average absolute deviation, 0.531 listening-window smoothness, and a strong 7.17 preference score with a subwoofer. Its dual 6.5-inch woofers, 92dB anechoic sensitivity, and 240W continuous power rating support high output and dynamics. Measured bass extension of 77.6Hz (-3dB).

Cons: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 4.51. The 4.35 sound-power directivity-index standard deviation also indicates more off-axis variation than the strongest designs, and the rear port needs placement clearance.

Full Ascend Acoustics CMT-340 SE2 review and specifications →

Bass Extension (-10dB)approximately 53Hz (measured, spinorama.org)
Bass Extension (-3dB)77.6Hz (measured, spinorama.org)
Dimensions21 x 7.5 x 10.5 in each
DriversTwo 6.5-inch woofers; 27mm soft-dome tweeter
Impedance8 ohms nominal
Power Handling240W continuous; 400W short-term peak
Sensitivity92dB at 2.83V/1m anechoic
Spinorama Preference Score4.51
Spinorama Preference Score with Perfect Sub7.17
Weight29.1 lbs (13.2 kg) each
Check current price at Ascend Acoustics ($798/pair) →Search eBay for Ascend Acoustics CMT-340 SE2 →

Mission LX-3 MKII: £249 per pair Richer Sounds eBay

Mission LX-3 MKII ranking card

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 →

CountryUnited Kingdom (design)
Dimensions13.6H x 8.9W x 12.1D in
Drivers1" microfiber-dome tweeter, 6.5" composite-fiber woofer
Enclosure2-way, bass-reflex
Impedance8 ohms nominal, 4.1 ohms minimum
Sensitivity88dB
Spinorama Preference Score3.26
Spinorama Preference Score with Perfect Sub5.52
Weight18.5 lbs (8.4 kg) each
Check current price at Richer Sounds (£249/pair) →Search eBay for Mission LX-3 MKII →