Short answer: the KEF Q Concerto Meta if sound quality matters most, the GR Research Klipsch RP-600M Upgrade if price matters most. The KEF Q Concerto Meta ranks #11 of 131 bookshelf speakers, rated 4.6/5, at $1,399.99. The GR Research Klipsch RP-600M Upgrade ranks #100, rated 3.2/5, at $279, $1,120.99 cheaper.
The case for the KEF Q Concerto Meta: Really good in-room neutrality with consistent horizontal directivity from seat to seat. The catch: Radiation pattern measures about ±50°, narrower than the reviewer’s preferred ±60° for a stronger sense of envelopment.
What the GR Research Klipsch RP-600M Upgrade does well: 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 catch: 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 KEF Q Concerto Meta if sound quality is the priority over the price, or the GR Research Klipsch RP-600M Upgrade if the price is the priority over sound quality.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| KEF Q Concerto Meta | GR Research Klipsch RP-600M Upgrade | |
|---|---|---|
| Price | $1,399.99 per pair | $279 per pair |
| Ranked | #11 of 131 in Large Size Bookshelf Speakers | #100 of 131 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 40.0Hz (measured, spinorama.org ASR data) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 68.8Hz (measured, spinorama.org ASR data) |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) | 15.7”H x 8”W x 11.9”D (398.8 x 203.2 x 302.3 mm) |
| Impedance | 4 ohms nominal (3.3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | - |
| Drivers | 165 mm (6.5 in.) hybrid aluminium cone woofer, 100 mm (4 in.) aluminium cone midrange, 19 mm (0.75 in.) vented aluminium dome with MAT tweeter | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn (stock Klipsch RP-600M drivers) |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) | 86.7dB (measured, Audio Science Review) |
| Weight | 20.9 lbs (9.5 kg) each | 16.1 lbs (7.3 kg) each |
| Woofer Cabinet | ported, rear | ported |
| Spinorama Preference Score | 6.01 | 5.11 |
| Spinorama Preference Score with Perfect Sub | 7.71 | 7.06 |
| DIY Kit | No | Yes |
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- KEF Q Concerto Meta vs GR-Research NX-Studio
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Prices on this page were last checked September 30, 2026 at 2:57 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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The Two Speakers In Full
KEF Q Concerto Meta: $1,399.99 per pair Amazon Crutchfield eBay
Pros: Really good in-room neutrality with consistent horizontal directivity from seat to seat. Directivity holds remarkably steady from lower treble into upper treble, where many similarly-priced speakers narrow sharply as frequency rises: one of the reviewer’s top 10 picks under $1,500. Measured bass extension of 53Hz (-3dB), with a measured sensitivity of 84.2dB.
Cons: Radiation pattern measures about ±50°, narrower than the reviewer’s preferred ±60° for a stronger sense of envelopment. Needs to be pointed closer to on-axis rather than heavily toed out: combined with its rolled-off, shelved-down top end, too much toe-out makes it sound noticeably dark.
Full KEF Q Concerto Meta review and specifications →
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) |
| Drivers | 165 mm (6.5 in.) hybrid aluminium cone woofer, 100 mm (4 in.) aluminium cone midrange, 19 mm (0.75 in.) vented aluminium dome with MAT tweeter |
| Impedance | 4 ohms nominal (3.3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) |
| Spinorama Preference Score | 6.01 |
| Spinorama Preference Score with Perfect Sub | 7.71 |
| Weight | 20.9 lbs (9.5 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: HiFi Perfection? KEF CONCERTO META Delivers! More from Erin’s Audio Corner →
- Erin’s Audio Corner Website KEF Q Concerto Meta
- Erin’s Audio Corner: I Tested 250 Speakers So You Don’t Have To!
- Erin’s Audio Corner: HiFi Perfection? KEF CONCERTO META Delivers!
- Erin’s Audio Corner: My Absolute Favorite Products of 2024 Revealed
- Erin’s Audio Corner Measurements (spinorama.org)
- Head-to-Head Comparisons
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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
- GR Research Klipsch RP-600M Upgrade vs DIYSG HT-10
- GR Research Klipsch RP-600M Upgrade vs Polk Monitor XT20
- GR Research Klipsch RP-600M Upgrade vs ELAC Debut 2.0 B6.2
- GR Research Klipsch RP-600M Upgrade vs Klipsch RP-600M II
- GR Research Klipsch RP-600M Upgrade vs ELAC Debut 3.0 DB63
- GR Research Klipsch RP-600M Upgrade vs KEF R3
- GR Research Klipsch RP-600M Upgrade vs KEF R3 Meta