Short answer: the MoFi SourcePoint 10 if sound quality matters most, the Ascend Acoustics Sierra-LX if price matters most. The MoFi SourcePoint 10 ranks #27 of 222 bookshelf speakers, rated 4.4/5, at $3,795. The Ascend Acoustics Sierra-LX ranks #37, rated 4.3/5, at $1,598, $2,197 cheaper.
The Ascend Acoustics Sierra-LX is the more accurate, deeper-bass choice. Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. Its measured preference score, a predictor of how neutral it sounds, is 6.63 against 4.16 for the MoFi SourcePoint 10. Its bass reaches about 47Hz before falling 3dB, against 56Hz for the MoFi SourcePoint 10. The tradeoff: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
Why pick the MoFi SourcePoint 10: Andrew Jones-designed concentric/coincident driver delivers best-in-class sound power and early-reflections directivity in the reviewer’s testing: a genuine “point source” design. The tradeoff: Like virtually all coincident designs, sounds notably bright pointed directly on-axis due to a deliberate treble lift (meant to compensate for the 28mm tweeter’s earlier beaming versus a typical 25mm/1” tweeter) combined with a diffraction dip/peak from the waveguide edge; needs about 15° of toe-out to sound neutral, and even then benefits from an extra 1-2dB of treble EQ.
Buy the Ascend Acoustics Sierra-LX when the price outweighs sound quality for you, and the MoFi SourcePoint 10 when sound quality outweighs the price instead.
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Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip.
Ascend Acoustics $1598 eBay
Andrew Jones-designed concentric/coincident driver delivers best-in-class sound power and early-reflections directivity in the reviewer’s testing: a genuine “point source” design.
Crutchfield $3795 eBayPrices on this page were last checked October 17, 2026 at 6:04 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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Specifications Side By Side
| Ascend Acoustics Sierra-LX | MoFi SourcePoint 10 | |
|---|---|---|
| Price | $1598 per pair | $3795 per pair |
| Ranked | #37 of 222 in Large Size Bookshelf Speakers | #27 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) | 56Hz (measured, Erin’s Audio Corner) |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) | 22.5”H x 14.5”W x 16.6”D (571.5 x 368.3 x 421.6 mm) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | 8 ohms nominal, 6.4 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) | 88.2dB (measured, Erin’s Audio Corner) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter | 10” Paper-pulp Cone woofer, 1.25-inch soft-dome tweeter |
| Weight | 20.9 lbs (9.5 kg) | 46.3 lbs (21.0 kg) each |
| Woofer Cabinet | Bass reflex, flared rear port | ported, rear |
| Power Handling | 350W continuous, 500W peak | - |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) | - |
| Country | USA | - |
| Spinorama Preference Score | 6.63 | 4.16 |
| Spinorama Preference Score with Perfect Sub | 8.44 | 6.17 |
| DIY Kit | No | No |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: Ascend Acoustics Sierra-LX (measured by the manufacturer) and MoFi SourcePoint 10 (measured by Erin’s Audio Corner), via spinorama.org.
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