Short answer: the Ascend Sierra 1 v2 for better sound quality, the XMechanik Mechano23 DIY for the lower price. The Ascend Sierra 1 v2 ranks #3 of 87 bookshelf speakers at $1000. The XMechanik Mechano23 DIY ranks #6 at $48, $952 cheaper.
What the Ascend Sierra 1 v2 offers: Formaldehyde-free layered bamboo ply cabinet with a 1” dome tweeter over a 5.25” midwoofer, mated by a 4th-order acoustic crossover rather than a stock textbook design. In-room response is extremely linear - the reviewer called it “textbook” - a clear step up from the earlier V1, which had boxiness around 700Hz-1kHz and sibilance around 4-6kHz. Preference score of 8.4 with a subwoofer (6.8 without), which the reviewer calls topnotch. Wide, even horizontal radiation of about ±70° up to 6kHz. Better vertical directivity than its tweeter-to-woofer spacing would suggest, thanks to the steep 4th-order crossover slopes. No mechanical noise, port chuffing, or woofer bottoming even driven to 96dB/1m. In a three-way comparison against the Dynaudio Emit 20 and a Revel bookshelf model (all around $1,000/pair), measured as the most linear of the three and was the reviewer’s personal pick over both, despite the Dynaudio’s deeper bass and higher output capability. Independent ASR Klippel measurements corroborate Erin’s findings: superb off-axis response with only slight on-axis variations, and an in-room response the reviewer called “incredibly smooth and accurate - amazing for a non-DSP speaker.” Distortion above 200Hz at 86dB/1m is very low for the class. Watch for: F3 of 55Hz and F10 of 39Hz mean in-room extension tops out in the mid-40s Hz; the reviewer still recommends a subwoofer for full-range material. Diffraction dips appear around 3kHz and 5-6kHz, and the 1” dome tweeter starts beaming above roughly 6.7kHz, narrowing the soundstage radiation in the top octave - a straightforward consequence of dome size rather than a design flaw. At 96dB/1m the 5.25” midwoofer shows increased distortion in the midrange, likely tied to motor topology; high-passing to a subwoofer around 80Hz largely clears it up. Moderate sensitivity (~81-82dB average) with a 7-ohm minimum impedance. ASR’s power-sweep testing found response holds steady up to 96dB SPL/1m, but pushing to 102dB causes midbass below 400Hz to sag with distortion “through the roof” - a harder output ceiling than the 96dB tests alone suggest. Vertical directivity also narrows above about 1kHz, so the reviewer recommends staying at tweeter-axis height for best results.
What the XMechanik Mechano23 DIY offers: The bass alignment is unusually well damped, with a measured Q of 0.336, among the lowest of any speaker in this catalog, so the -3dB point at 77.6Hz rolls off cleanly instead of building into a resonant bump the way many small ported designs do. On axis deviation measures a tight 0.195dB average, and Audio Science Review’s independent Klippel NFS review called the predicted in room response nearly perfect, with directivity matching that beats some commercial designs costing many times more, all from about $200 in parts. Watch for: This is a true DIY project. There is no assembled unit to buy, drivers come from Madisound, the crossover kit comes separately from EZ Speaker Solutions, and the birch plywood cabinet has to be built and finished by hand. Listening window smoothness measures a moderate 0.47 and the sound power directivity index has more variation (standard deviation 4.02) than the tightest speakers in this catalog, so off axis energy isn’t quite as evenly controlled as the excellent on axis figures suggest.
Buy the Ascend Sierra 1 v2 if sound quality is the priority over the price, or the XMechanik Mechano23 DIY if the price is the priority over sound quality.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Ascend Sierra 1 v2 | XMechanik Mechano23 DIY | |
|---|---|---|
| Price | $1000 per pair | $200 per pair DIY parts |
| Ranked | #3 of 87 in Medium Size Bookshelf Speakers | #6 of 87 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 39Hz (measured, Erin's Audio Corner) | 42.4Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 55Hz (measured, Erin's Audio Corner) | 77.6Hz (measured, Audio Science Review) |
| Dimensions | 14.2"H x 7.5"W x 10.5"D (361.9 x 190.5 x 266.7 mm) | 11.4"H x 6.9"W x 10.4"D (290 x 174 x 263 mm) |
| Impedance | 8 ohms nominal, 7 ohms minimum (measured, Erin's Audio Corner) | - |
| Sensitivity | 81.5dB (measured, Erin's Audio Corner) | 85.1dB @ 2.83V/1m (measured, Audio Science Review) |
| Drivers | 5.25" proprietary mineral-filled polypropylene cone with cast aluminum frame woofer, 26mm aluminum/magnesium alloy dome tweeter with titanium former (SEAS Titan) | Scan-Speak Discovery H2606/9200 1" horn loaded textile dome tweeter, SB Acoustics SB13PFCR25-4 5" fiber cone woofer |
| Weight | 18.5 lbs (8.4 kg) each | - |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 6.28 | 4.70 |
| Spinorama Preference Score with Perfect Sub | 8.24 | 7.16 |
| Enclosure | - | ported |
| Port Tuning | - | Approximately 45Hz |
| Cabinet Material | - | 18mm Baltic birch plywood |
| Country | - | Design origin: United States (ASR forum); assembled by buyer |
Related Speaker Comparisons
How Ascend Sierra 1 v2 compares with other leading options:
- Ascend Sierra 1 v2 vs Audio First Fidelia
- Ascend Sierra 1 v2 vs Philharmonic Ceramic Mini
- Ascend Sierra 1 v2 vs KEF LS50 Meta
- Ascend Sierra 1 v2 vs Ascend Acoustics HTM-200SE2
- Arendal 1961 Monitor vs Ascend Sierra 1 v2
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 Sierra 1 v2: $1000 per pair Ascendacoustics eBay
Pros: Formaldehyde-free layered bamboo ply cabinet with a 1” dome tweeter over a 5.25” midwoofer, mated by a 4th-order acoustic crossover rather than a stock textbook design. In-room response is extremely linear - the reviewer called it “textbook” - a clear step up from the earlier V1, which had boxiness around 700Hz-1kHz and sibilance around 4-6kHz. Preference score of 8.4 with a subwoofer (6.8 without), which the reviewer calls topnotch. Wide, even horizontal radiation of about ±70° up to 6kHz. Better vertical directivity than its tweeter-to-woofer spacing would suggest, thanks to the steep 4th-order crossover slopes. No mechanical noise, port chuffing, or woofer bottoming even driven to 96dB/1m. In a three-way comparison against the Dynaudio Emit 20 and a Revel bookshelf model (all around $1,000/pair), measured as the most linear of the three and was the reviewer’s personal pick over both, despite the Dynaudio’s deeper bass and higher output capability. Independent ASR Klippel measurements corroborate Erin’s findings: superb off-axis response with only slight on-axis variations, and an in-room response the reviewer called “incredibly smooth and accurate - amazing for a non-DSP speaker.” Distortion above 200Hz at 86dB/1m is very low for the class. Measured bass extension of 55Hz (-3dB), with a measured sensitivity of 81.5dB.
Cons: F3 of 55Hz and F10 of 39Hz mean in-room extension tops out in the mid-40s Hz; the reviewer still recommends a subwoofer for full-range material. Diffraction dips appear around 3kHz and 5-6kHz, and the 1” dome tweeter starts beaming above roughly 6.7kHz, narrowing the soundstage radiation in the top octave - a straightforward consequence of dome size rather than a design flaw. At 96dB/1m the 5.25” midwoofer shows increased distortion in the midrange, likely tied to motor topology; high-passing to a subwoofer around 80Hz largely clears it up. Moderate sensitivity (~81-82dB average) with a 7-ohm minimum impedance. ASR’s power-sweep testing found response holds steady up to 96dB SPL/1m, but pushing to 102dB causes midbass below 400Hz to sag with distortion “through the roof” - a harder output ceiling than the 96dB tests alone suggest. Vertical directivity also narrows above about 1kHz, so the reviewer recommends staying at tweeter-axis height for best results.
Full Ascend Sierra 1 v2 review and specifications →
| Bass Extension (-10dB) | 39Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 55Hz (measured, Erin's Audio Corner) |
| Dimensions | 14.2"H x 7.5"W x 10.5"D (361.9 x 190.5 x 266.7 mm) |
| Drivers | 5.25" proprietary mineral-filled polypropylene cone with cast aluminum frame woofer, 26mm aluminum/magnesium alloy dome tweeter with titanium former (SEAS Titan) |
| Impedance | 8 ohms nominal, 7 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 81.5dB (measured, Erin's Audio Corner) |
| Spinorama Preference Score | 6.28 |
| Spinorama Preference Score with Perfect Sub | 8.24 |
| Weight | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: NEW! Ascend Acoustics Sierra-1 V2 Review More from Erin’s Audio Corner →
- Erin’s Audio Corner Website Ascend Sierra 1 v2
- Audio Science Review Ascend Sierra 1 v2 More from Audio Science Review →
- Erin’s Audio Corner: 5 AWESOME SPEAKERS Under $1000 You Won’t Regret
- Erin’s Audio Corner: I Tested 250 Speakers So You Don’t Have To!
- Erin’s Audio Corner: My Top Picks of 2023: Must-Haves Under $3000
- Manufacturer Measurements (spinorama.org)
- Head-to-Head Comparisons
- Ascend Sierra 1 v2 vs KEF LS50 Meta
- Ascend Sierra 1 v2 vs Philharmonic Ceramic Mini
- Ascend Sierra 1 v2 vs Audio First Fidelia
- Ascend Sierra 1 v2 vs Ascend Acoustics HTM-200SE2
- Ascend Sierra 1 v2 vs Arendal 1961 Monitor
- Ascend Sierra 1 v2 vs Ascend Acoustics Luna V2 Mini-Monitor Titan
- Ascend Sierra 1 v2 vs Aalto Speakers Aalto 1 EVO
- Ascend Sierra 1 v2 vs Moondrop M4P MTM
- See all 49 comparisons
XMechanik Mechano23 DIY: $200 per pair DIY parts Madisound (Tweeter) Madisound (Woofer) eBay
Pros: The bass alignment is unusually well damped, with a measured Q of 0.336, among the lowest of any speaker in this catalog, so the -3dB point at 77.6Hz rolls off cleanly instead of building into a resonant bump the way many small ported designs do. On axis deviation measures a tight 0.195dB average, and Audio Science Review’s independent Klippel NFS review called the predicted in room response nearly perfect, with directivity matching that beats some commercial designs costing many times more, all from about $200 in parts. Measured bass extension of 77.6Hz (-3dB), with a measured sensitivity of 85.1dB.
Cons: This is a true DIY project. There is no assembled unit to buy, drivers come from Madisound, the crossover kit comes separately from EZ Speaker Solutions, and the birch plywood cabinet has to be built and finished by hand. Listening window smoothness measures a moderate 0.47 and the sound power directivity index has more variation (standard deviation 4.02) than the tightest speakers in this catalog, so off axis energy isn’t quite as evenly controlled as the excellent on axis figures suggest.
Full XMechanik Mechano23 DIY review and specifications →
| Bass Extension (-10dB) | 42.4Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 77.6Hz (measured, Audio Science Review) |
| Cabinet Material | 18mm Baltic birch plywood |
| Country | Design origin: United States (ASR forum); assembled by buyer |
| Dimensions | 11.4"H x 6.9"W x 10.4"D (290 x 174 x 263 mm) |
| Drivers | Scan-Speak Discovery H2606/9200 1" horn loaded textile dome tweeter, SB Acoustics SB13PFCR25-4 5" fiber cone woofer |
| Enclosure | ported |
| Port Tuning | Approximately 45Hz |
| Sensitivity | 85.1dB @ 2.83V/1m (measured, Audio Science Review) |
| Spinorama Preference Score | 4.70 |
| Spinorama Preference Score with Perfect Sub | 7.16 |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- XMechanik Mechano23 DIY vs Ascend Acoustics HTM-200SE2
- XMechanik Mechano23 DIY vs Arendal 1961 Monitor
- XMechanik Mechano23 DIY vs KEF LS50 Meta
- XMechanik Mechano23 DIY vs Philharmonic Ceramic Mini
- XMechanik Mechano23 DIY vs Ascend Acoustics Luna V2 Mini-Monitor Titan
- XMechanik Mechano23 DIY vs Aalto Speakers Aalto 1 EVO
- XMechanik Mechano23 DIY vs Audio First Fidelia
- XMechanik Mechano23 DIY vs Monitor Audio Silver 50 7G
- See all 20 comparisons