Short answer: the Ascend Acoustics Sierra-LX. It ranks #33 of 131 bookshelf speakers by sound quality, rated 4.3/5, at $1,598; the JBL HDI-1600 ranks #45, rated 4.2/5, and costs $1,980, so there is little reason to consider the other one.
What the Ascend Acoustics Sierra-LX does well: Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. The tradeoff: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
What the JBL HDI-1600 does well: CEA2034 spinorama is very flat in the critical mid-to-upper frequencies, with a slight bass boost that should have a good subjective effect and very smooth early-window directivity. The tradeoff: A dip appears above 10kHz on-axis.
One note: the JBL HDI-1600 is discontinued, but it still ranks #45 of 131 bookshelf speakers by sound quality, ahead of most of what is still sold new, so it is worth considering used.
Buy the Ascend Acoustics Sierra-LX. It is rated higher for sound quality than the JBL HDI-1600 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Ascend Acoustics Sierra-LX | JBL HDI-1600 | |
|---|---|---|
| Price | $1598 per pair | $1980 per pair Discontinued |
| Ranked | #33 of 131 in Large Size Bookshelf Speakers | #45 of 131 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | 40Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) | 55.7Hz (measured, Audio Science Review) |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) | 14.6”H x 9.1”W x 11.4”D (370.0 x 230.0 x 288.9 mm) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | 4 ohms nominal (measured, Audio Science Review) |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) | 85dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter | 1” tweeter + 6.5” woofer |
| Weight | 20.9 lbs (9.5 kg) | 53.4 lbs (24.2 kg) |
| 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 | 5.37 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 8.44 | 7.32 (spinorama.org) |
| DIY Kit | No | No |
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The Two Speakers In Full
Ascend Acoustics Sierra-LX: $1598 per pair Ascend Acoustics eBay
Pros: Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. Bass extension down to about 40Hz in-room despite the compact size. Wide, well-balanced soundstage (~60 degrees). Solid build quality with a laminated bamboo cabinet. Measured bass extension of 47Hz (-3dB), with a measured sensitivity of 81dB.
Cons: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels. Noticeable midrange distortion becomes audible above about 82-83dB SPL. A narrow dip around 3.5kHz on-axis in larger rooms without sidewall reflections: toeing the speakers out 10-20 degrees fills it in, but adds some brightness to the treble. Sensitive to listening height: sitting even slightly above or below tweeter level noticeably shifts the tonal balance.
Full Ascend Acoustics Sierra-LX review and specifications →
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) |
| Country | USA |
| DIY Kit | No |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) |
| Power Handling | 350W continuous, 500W peak |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 6.63 |
| Spinorama Preference Score with Perfect Sub | 8.44 |
| Weight | 20.9 lbs (9.5 kg) |
| Woofer Cabinet | Bass reflex, flared rear port |
- Links
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JBL HDI-1600: $1980 per pair Discontinued Crutchfield eBay
Pros: CEA2034 spinorama is very flat in the critical mid-to-upper frequencies, with a slight bass boost that should have a good subjective effect and very smooth early-window directivity. Predicted in-room response in a simulated average listening room closely tracks the reviewer’s own preferred target curve. Measured bass extension of 55.7Hz (-3dB), with a measured sensitivity of 85dB.
Cons: A dip appears above 10kHz on-axis. Cumulative spectral decay (waterfall) shows some messiness around the crossover along with a 700Hz resonance. Harmonic distortion rises to nearly 2% right at the 1.9kHz crossover point at 96dB SPL/1m. Discontinued.
Full JBL HDI-1600 review and specifications →
| Bass Extension (-10dB) | 40Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 55.7Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 14.6”H x 9.1”W x 11.4”D (370.0 x 230.0 x 288.9 mm) |
| Drivers | 1” tweeter + 6.5” woofer |
| Impedance | 4 ohms nominal (measured, Audio Science Review) |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 5.37 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.32 (spinorama.org) |
| Weight | 53.4 lbs (24.2 kg) |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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