Short answer: the ELAC Debut 2.0 B5.2. It ranks #48 of 89 bookshelf speakers by sound quality, rated 3.2/5, at $269; the MartinLogan Motion 4i ranks #63, rated 2.8/5, and costs $495.94, which makes this an easy call rather than a real tradeoff.
Why pick the ELAC Debut 2.0 B5.2: Good horizontal directivity: the off-axis curves track the on-axis response closely, so the broad tonal error responds predictably to EQ. Watch for: Erin measured a broad +3dB step beginning around 1.5kHz; the resulting elevated upper range sounds tonally uneven even though it is not a narrow, sharp resonance.
What the MartinLogan Motion 4i does well: Best treated as a satellite: crossing it to a subwoofer lifts its predicted preference score from 2.73 to 6.36, so the shallow bass matters far less in a 2.1 or home-theater setup. The tradeoff: Bass-shy to the point of needing a subwoofer: the measured -3dB point is 159.7Hz, so on its own it produces almost nothing below roughly 160Hz.
Buy the ELAC Debut 2.0 B5.2. It is rated higher for sound quality than the MartinLogan Motion 4i and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| ELAC Debut 2.0 B5.2 | MartinLogan Motion 4i | |
|---|---|---|
| Price | $269.00 per pair | $495.94 per pair |
| Ranked | #48 of 89 in Medium Size Bookshelf Speakers | #63 of 89 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 60Hz (measured, Erin’s Audio Corner) | 159.7Hz (measured, Audio Science Review via spinorama.org) |
| Dimensions | 13.4”H x 7.1”W x 9.2”D (341 x 180 x 234 mm) | 12.6” x 5.6” x 5.7” (320 x 143 x 145 mm) (H x W x D) |
| Impedance | 6 ohms nominal (manufacturer specified) | 4 ohms nominal |
| Sensitivity | About 83dB after recommended EQ (measured, Erin’s Audio Corner; 86dB manufacturer specified) | 87.5dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 5.25” aramid-fiber woofer, 1” cloth-dome tweeter | 1” x 1.4” Folded Motion tweeter, 4” paper cone woofer |
| Weight | 13 lbs (5.9 kg) each | 6 lbs (2.72 kg) |
| Woofer Cabinet | ported, front | - |
| Spinorama Preference Score | 5.02 | 2.73 |
| Spinorama Preference Score with Perfect Sub | 7.27 | 6.36 |
| DIY Kit | No | No |
| Configuration | - | Passive 2-way bookshelf speaker |
| Enclosure | - | ported, rear |
| Crossover Frequency | - | 2,900 Hz |
| Coverage | - | 80° x 80° |
| Frequency Response | - | 70Hz - 23kHz (±3dB, Manufacturer specified) |
| Recommended Power | - | 20-150W |
| Country | - | United States (design) |
| Measurement Source | - | Audio Science Review |
Related Speaker Comparisons
More worthwhile head-to-heads for ELAC Debut 2.0 B5.2:
- ELAC Debut 2.0 B5.2 vs Audio First Fidelia
- ELAC Debut 2.0 B5.2 vs Philharmonic Ceramic Mini
- ELAC Debut 2.0 B5.2 vs Ascend Sierra 1 v2
- KEF LS50 Meta vs ELAC Debut 2.0 B5.2
- XMechanik Mechano23 DIY vs ELAC Debut 2.0 B5.2
Prices on this page were last checked September 26, 2026 at 11:14 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
ELAC Debut 2.0 B5.2: $269.00 per pair Amazon eBay
Pros: Good horizontal directivity: the off-axis curves track the on-axis response closely, so the broad tonal error responds predictably to EQ. Erin demonstrated that a single high-shelf filter centered near 1.6kHz, about -2dB with Q near 2, substantially improves linearity. Moderate roughly +/-50-60 degree horizontal coverage balances room interaction and image focus. The front port makes close-to-wall placement practical. Erin measured F3 near 60Hz and F10 near 40Hz, useful extension for a compact 5.25-inch two-way. Harmonic distortion is mostly below 1% at 86dB/1m, and low-frequency distortion is better than its size might suggest. Compact cabinet and inexpensive pair pricing make it a workable EQ-assisted desktop or small-room system. Measured bass extension of 60Hz (-3dB), with a measured sensitivity of 83dB.
Cons: Erin measured a broad +3dB step beginning around 1.5kHz; the resulting elevated upper range sounds tonally uneven even though it is not a narrow, sharp resonance. Native response spans roughly -2.6 to +4dB around the mean, so this is not a neutral speaker without correction. Sensitivity is only about 83dB after correcting the shelf, demanding materially more amplifier voltage than ELAC’s 86dB specification implies. Vertical response changes substantially outside roughly +/-10 degrees of tweeter height. Dynamic compression is the larger limitation: at the highest sweep level it loses roughly 1-1.5dB through the midrange, and even the 86dB trace shows unusual nonlinearity that may involve crossover heating. At about 96dB, multitone distortion rises audibly around 600Hz; an 80-120Hz subwoofer crossover helps but does not turn it into a high-output design. Erin recommends the larger B6.2 instead when EQ is unavailable.
Full ELAC Debut 2.0 B5.2 review and specifications →
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 60Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 13.4”H x 7.1”W x 9.2”D (341 x 180 x 234 mm) |
| Drivers | 5.25” aramid-fiber woofer, 1” cloth-dome tweeter |
| Impedance | 6 ohms nominal (manufacturer specified) |
| Sensitivity | About 83dB after recommended EQ (measured, Erin’s Audio Corner; 86dB manufacturer specified) |
| Spinorama Preference Score | 5.02 |
| Spinorama Preference Score with Perfect Sub | 7.27 |
| Weight | 13 lbs (5.9 kg) each |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- ELAC Debut 2.0 B5.2 vs Sony SS-CS5 M2
- ELAC Debut 2.0 B5.2 vs Paradigm Monitor SE Atom
- ELAC Debut 2.0 B5.2 vs JBL Studio 530
- ELAC Debut 2.0 B5.2 vs Dynaudio Emit M10
- ELAC Debut 2.0 B5.2 vs ELAC BS U5
- ELAC Debut 2.0 B5.2 vs JBL Stage 2 250B
- ELAC Debut 2.0 B5.2 vs Boston Acoustics A25
- ELAC Debut 2.0 B5.2 vs Dynaudio X14
- See all 44 comparisons
MartinLogan Motion 4i: $495.94 per pair Amazon Crutchfield eBay
Pros: Best treated as a satellite: crossing it to a subwoofer lifts its predicted preference score from 2.73 to 6.36, so the shallow bass matters far less in a 2.1 or home-theater setup. Directivity is the strong point, with sound-power deviation (NBD 0.426) lower than its on-axis figure (0.547), meaning the off-axis output tracks the front more evenly than most budget cabinets and the image stays stable around the room. The Folded Motion tweeter measures cleanly for the price, and 87.5dB measured sensitivity (2.83V/1m) means modest amplifiers drive it easily. Measured bass extension of 159.7Hz (-3dB), with a measured sensitivity of 87.5dB.
Cons: Bass-shy to the point of needing a subwoofer: the measured -3dB point is 159.7Hz, so on its own it produces almost nothing below roughly 160Hz. The balance is bright and uneven, deviating 2.7dB across 300Hz-5kHz with a clear upward tilt, and the review’s verdict is a “bass-shy, bright” speaker. A port resonance near 850Hz and high woofer distortion add audible roughness through the midrange, and impedance dips below 3 ohms, so it wants an amplifier comfortable with low-impedance loads.
Full MartinLogan Motion 4i review and specifications →
| Bass Extension (-3dB) | 159.7Hz (measured, Audio Science Review via spinorama.org) |
|---|---|
| Configuration | Passive 2-way bookshelf speaker |
| Country | United States (design) |
| Coverage | 80° x 80° |
| Crossover Frequency | 2,900 Hz |
| DIY Kit | No |
| Dimensions | 12.6” x 5.6” x 5.7” (320 x 143 x 145 mm) (H x W x D) |
| Drivers | 1” x 1.4” Folded Motion tweeter, 4” paper cone woofer |
| Enclosure | ported, rear |
| Frequency Response | 70Hz - 23kHz (±3dB, Manufacturer specified) |
| Impedance | 4 ohms nominal |
| Measurement Source | Audio Science Review |
| Recommended Power | 20-150W |
| Sensitivity | 87.5dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 2.73 |
| Spinorama Preference Score with Perfect Sub | 6.36 |
| Weight | 6 lbs (2.72 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons