Short answer: the ELAC Debut 2.0 B6.2. It ranks #86 of 131 bookshelf speakers by sound quality, rated 3.5/5, at $329. The GR Research Klipsch RP-600M Upgrade ranks #100, rated 3.2/5, at $279, $50 cheaper, a saving that is not big enough to make up the sound-quality gap.
The case for the ELAC Debut 2.0 B6.2: Reasonably flat on-axis and listening-window response with reasonably even horizontal directivity, holding about ±60° up to roughly 8kHz for consistent stereo width whether aimed directly at the listener or toed out. Watch for: A good size resonant peak around 700Hz stands out from an otherwise smooth response and lingers in cumulative spectral decay (waterfall) measurements - in one reviewer’s sighted A/B test, reducing it by about 5dB via EQ made a noticeable but not dramatic difference.
The case for the GR Research Klipsch RP-600M Upgrade: GR Research’s replacement crossover fixes the stock Klipsch RP-600M’s biggest flaw, a deep response dip around the crossover, by using gentler first-order filters. The tradeoff: This is a DIY kit, not a finished speaker: you need a pair of the original Klipsch RP-600M, which is discontinued, and must rebuild both crossovers yourself.
Buy the ELAC Debut 2.0 B6.2. It is rated higher for sound quality, and the $50 you would save on the GR Research Klipsch RP-600M Upgrade does not close the gap.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| ELAC Debut 2.0 B6.2 | GR Research Klipsch RP-600M Upgrade | |
|---|---|---|
| Price | $329.00 per pair | $279 per pair |
| Ranked | #86 of 131 in Large Size Bookshelf Speakers | #100 of 131 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) | 40.0Hz (measured, spinorama.org ASR data) |
| Bass Extension (-3dB) | 64Hz (measured, Erin’s Audio Corner) | 68.8Hz (measured, spinorama.org ASR data) |
| Impedance | 6 ohms nominal, 5.2 ohms minimum (measured, Erin’s Audio Corner) | - |
| Sensitivity | 86.5dB (measured, Audio Science Review) | 86.7dB (measured, Audio Science Review) |
| Drivers | 25mm tweeter + 165mm woofer | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn (stock Klipsch RP-600M drivers) |
| Weight | 29.1 lbs (13.2 kg) | 16.1 lbs (7.3 kg) each |
| Dimensions | 14.8”H x 7.7”W x 10.6”D (375.0 x 195.0 x 268.0 mm) | 15.7”H x 8”W x 11.9”D (398.8 x 203.2 x 302.3 mm) |
| Woofer Cabinet | ported, front | ported |
| Spinorama Preference Score | 4.75 (spinorama.org) | 5.11 |
| Spinorama Preference Score with Perfect Sub | 7.0 (spinorama.org) | 7.06 |
| DIY Kit | No | Yes |
Related Speaker Comparisons
How ELAC Debut 2.0 B6.2 compares with other leading options:
- ELAC Debut 2.0 B6.2 vs Perlisten S4b
- ELAC Debut 2.0 B6.2 vs KEF Reference 1 Meta
- ELAC Debut 2.0 B6.2 vs GR-Research NX-Studio
- AsciLab C6B vs ELAC Debut 2.0 B6.2
- ELAC Debut 2.0 B6.2 vs Audio First Cadentia 3
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 B6.2: $329.00 per pair Amazon Crutchfield eBay
Pros: Reasonably flat on-axis and listening-window response with reasonably even horizontal directivity, holding about ±60° up to roughly 8kHz for consistent stereo width whether aimed directly at the listener or toed out. Its larger-than-typical woofer lets it play very loud with minimal distortion, staying under about 1% THD down to 50Hz at 86dB, and minimum impedance stays a comfortable 5-6 ohms. In-room bass extension reaches about 50Hz without much trouble, enough for a solid kick-drum sound. Takes equalization very well - correcting the on-axis response doesn’t cost sensitivity through the midrange, and the underlying directivity behavior (diffraction, vertical mismatch) is mild enough that EQ alone gets most of the way to a well-balanced sound. Vertical tolerance is asymmetric and fairly forgiving: about 10° above the tweeter axis and 20° below it before tonal balance meaningfully shifts. One reviewer called it “a good speaker” with “a good price” rather than just good-for-the-price, and found it fairly neutral overall in-room. Measured bass extension of 64Hz (-3dB), with a measured sensitivity of 86.5dB.
Cons: A good size resonant peak around 700Hz stands out from an otherwise smooth response and lingers in cumulative spectral decay (waterfall) measurements - in one reviewer’s sighted A/B test, reducing it by about 5dB via EQ made a noticeable but not dramatic difference. Directivity error shows up around 3.3kHz, and the upper-midrange around 4-6kHz stood out as edgy and sharp, almost sibilant at times, in casual listening - the predicted in-room response shows a lack of energy between 1-2kHz and a bit too much above that, which one reviewer thought would sound bright. Distortion at 96dB SPL/1m shows two harmonic peaks the reviewer says “should not be there,” one from woofer breakup around 400Hz and another around 7-8kHz from the tweeter, and multitone distortion approaches 10% in the 500-800Hz range at that output level. Real compression shows up even at moderate volume and worsens at 96dB and above, with the woofer clearly giving up around 60-70Hz - a subwoofer is recommended for anyone wanting to listen loud, since running it full-range at high output costs real dynamic range in the midbass and bass. Don’t place it close to a wall - boundary reinforcement adds a midbass bump that undoes the otherwise smooth, linear response. Getting the best out of it takes EQ (taming the 700Hz peak, filling in the 1-2kHz dip, and trimming the highs).
Full ELAC Debut 2.0 B6.2 review and specifications →
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 64Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 14.8”H x 7.7”W x 10.6”D (375.0 x 195.0 x 268.0 mm) |
| Drivers | 25mm tweeter + 165mm woofer |
| Impedance | 6 ohms nominal, 5.2 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 86.5dB (measured, Audio Science Review) |
| Spinorama Preference Score | 4.75 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.0 (spinorama.org) |
| Weight | 29.1 lbs (13.2 kg) |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- ELAC Debut 2.0 B6.2 vs SVS Prime Bookshelf
- ELAC Debut 2.0 B6.2 vs Dynaudio Special Forty
- ELAC Debut 2.0 B6.2 vs Infinity IL10
- ELAC Debut 2.0 B6.2 vs GR-Research X-LS Encore
- ELAC Debut 2.0 B6.2 vs KEF Q3 Meta
- ELAC Debut 2.0 B6.2 vs Polk Monitor XT20
- ELAC Debut 2.0 B6.2 vs Sonus Faber Lumina II
- ELAC Debut 2.0 B6.2 vs XTZ Spirit 4
- See all 62 comparisons
GR Research Klipsch RP-600M Upgrade: $279 per pair GR Research eBay
Pros: GR Research’s replacement crossover fixes the stock Klipsch RP-600M’s biggest flaw, a deep response dip around the crossover, by using gentler first-order filters. Audio Science Review’s measurements show listening-window smoothness rising from 0.40 to 0.78 and the preference score from 3.66 to 5.11 (5.61 to 7.06 with an ideal subwoofer), with response within 3dB from 80Hz to 20kHz. Bass reaches 68.8Hz at -3dB and about 40Hz at -10dB, and the kit also cuts ringing around 800Hz. At $279 per pair it comes with all new crossover parts, No-Rez damping, wiring and connectors. Measured bass extension of 68.8Hz (-3dB), with a measured sensitivity of 86.7dB.
Cons: This is a DIY kit, not a finished speaker: you need a pair of the original Klipsch RP-600M, which is discontinued, and must rebuild both crossovers yourself. It does not fit the RP-600M II. Sensitivity drops about 1.5dB to 86.7dB, horizontal directivity narrows for a smaller sweet spot, and a 4.44 directivity-index deviation shows uneven off-axis sound. Average on-axis deviation of 0.49dB is rougher than the stock speaker’s 0.23dB, and the current RP-600M II scores higher (5.64) with no work at all.
Full GR Research Klipsch RP-600M Upgrade review and specifications →
| Bass Extension (-10dB) | 40.0Hz (measured, spinorama.org ASR data) |
|---|---|
| Bass Extension (-3dB) | 68.8Hz (measured, spinorama.org ASR data) |
| DIY Kit | Yes |
| Dimensions | 15.7”H x 8”W x 11.9”D (398.8 x 203.2 x 302.3 mm) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn (stock Klipsch RP-600M drivers) |
| Sensitivity | 86.7dB (measured, Audio Science Review) |
| Spinorama Preference Score | 5.11 |
| Spinorama Preference Score with Perfect Sub | 7.06 |
| Weight | 16.1 lbs (7.3 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons