Short answer: the Genelec 8351B for better sound quality, the Klipsch The Nines for the lower price. The Genelec 8351B ranks #6 of 66 powered bookshelf speakers at $9150. The Klipsch The Nines ranks #30 at $999.99, $8150.01 cheaper.
What the Klipsch The Nines offers: Erin calls these his favorite Klipsch speaker he has heard. With the tweeter trim set to -2dB, the listening-window response stays within roughly +/-1.5dB from 40Hz to just above 10kHz, and they produced genuinely powerful bass that reached about 30Hz in his room. The 8-inch woofer remains below 3% THD from 30Hz upward at 96dB/1m; compression is well controlled through about 90dB, and its limiter was not a concern at realistic listening levels. Exceptional all-in-one connectivity includes HDMI ARC, phono, USB, optical, Bluetooth, analog inputs and a subwoofer output; the Klipsch Connect app supplies useful bass/mid/treble adjustment. Watch for: The app’s flat setting leaves the treble elevated, and Erin preferred a -2dB tweeter trim. There is a likely tweeter/waveguide breakup feature around 16kHz, though he did not hear it. Horizontal coverage is narrow (about +/-30 degrees), prioritizing a focused image over room involvement; listeners who prefer a wider soundstage may not like that trade-off. Ear height matters: he recommends the reference plane between woofer and tweeter rather than directly on tweeter axis. The speaker begins limiting above roughly 90dB/1m, and the two cabinets still require a physical inter-speaker cable.
What the Genelec 8351B offers: CEA2034 spinorama shows exceptionally flat response both on- and off-axis. Predicted in-room response is “as good as it gets” - should sound very neutral in nearly any room. Horizontal beamwidth of about ±50 degrees is described by the reviewer as exceptionally smooth, a model example of well-executed directivity control. Vertical directivity is nearly as good as horizontal, a benefit of its coaxial driver design that’s rare among non-coaxial monitors. Distortion at 86dB SPL/1m is remarkably low - the reviewer says it’s “better than many headphones.” Watch for: Deep bass distortion rises substantially at higher output (96dB SPL/1m) - the reviewer notes “deep bass suffers” below about 100Hz. A distortion spike also appears near 8-10kHz at that same higher output level. Cumulative spectral decay (waterfall) measurements show resonances around 1-2kHz. Very expensive.
Buy the Klipsch The Nines if the price matters more than sound quality. Buy the Genelec 8351B if sound quality matters more than the price.
Specifications Side By Side
| Klipsch The Nines | Genelec 8351B | |
|---|---|---|
| Price | $999.99 | $9150 |
| Ranked | #30 of 66 in Large Size Powered Bookshelf Speakers | #6 of 66 in Large Size Powered Bookshelf Speakers |
| Drivers | 8" high-excursion fiber-composite woofer, 1" titanium LTS vented tweeter with Tractrix horn | 8.6" woofer, 5" coaxial with tweeter midrange, 0.75" (19mm) coaxial tweeter |
| Output Power | 240W total (480W peak; 100W LF + 20W HF per powered speaker) | 550w Per Speaker |
| Inputs | HDMI ARC, Bluetooth 5.0, phono/line RCA, 3.5mm, USB, optical | XLR |
| Dimensions | 19.13"H x 9.5"W x 13.38"D | 17"H x 11.3"W x 10.9"D (431.8 x 287 x 276.9 mm) |
| Weight | 28.4 lbs primary, 27.0 lbs secondary | 31.1 lbs / 14.1 kg each |
| Sensitivity | 82.5dB (measured at 0.30V/1m, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 41Hz (measured, Erin’s Audio Corner) | 33Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 31Hz (measured, Erin’s Audio Corner) | 28Hz (measured, Audio Science Review) |
| Frequency Response | 34Hz - 25kHz +/-3dB (manufacturer specified) | 32Hz - 40kHz (±1.5dB) (Manufacturer specified) |
| Max SPL | 115dB at 1m (stereo pair, manufacturer specified) | 113dB @ 1m |
| App | Klipsch Connect (bass/mid/treble EQ) | Yes (GLM) |
| Woofer Cabinet | rear-ported bass reflex | - |
| Bluetooth | - | No |
| DSP | - | Yes |
| EQ | - | Yes (via GLM software) |
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Prices on this page were last checked August 25, 2026 at 6:19 AM 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
Klipsch The Nines: $999.99 Crutchfield eBay
Pros: Erin calls these his favorite Klipsch speaker he has heard. With the tweeter trim set to -2dB, the listening-window response stays within roughly +/-1.5dB from 40Hz to just above 10kHz, and they produced genuinely powerful bass that reached about 30Hz in his room. The 8-inch woofer remains below 3% THD from 30Hz upward at 96dB/1m; compression is well controlled through about 90dB, and its limiter was not a concern at realistic listening levels. Exceptional all-in-one connectivity includes HDMI ARC, phono, USB, optical, Bluetooth, analog inputs and a subwoofer output; the Klipsch Connect app supplies useful bass/mid/treble adjustment.
Cons: The app’s flat setting leaves the treble elevated, and Erin preferred a -2dB tweeter trim. There is a likely tweeter/waveguide breakup feature around 16kHz, though he did not hear it. Horizontal coverage is narrow (about +/-30 degrees), prioritizing a focused image over room involvement; listeners who prefer a wider soundstage may not like that trade-off. Ear height matters: he recommends the reference plane between woofer and tweeter rather than directly on tweeter axis. The speaker begins limiting above roughly 90dB/1m, and the two cabinets still require a physical inter-speaker cable.
Full Klipsch The Nines review and specifications →
| App | Klipsch Connect (bass/mid/treble EQ) |
|---|---|
| Bass Extension (-10dB) | 31Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 41Hz (measured, Erin's Audio Corner) |
| Dimensions | 19.13"H x 9.5"W x 13.38"D |
| Drivers | 8" high-excursion fiber-composite woofer, 1" titanium LTS vented tweeter with Tractrix horn |
| Frequency Response | 34Hz - 25kHz +/-3dB (manufacturer specified) |
| Inputs | HDMI ARC, Bluetooth 5.0, phono/line RCA, 3.5mm, USB, optical |
| Max SPL | 115dB at 1m (stereo pair, manufacturer specified) |
| Output Power | 240W total (480W peak; 100W LF + 20W HF per powered speaker) |
| Sensitivity | 82.5dB (measured at 0.30V/1m, Erin's Audio Corner) |
| Weight | 28.4 lbs primary, 27.0 lbs secondary |
| Woofer Cabinet | rear-ported bass reflex |
- Links
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Genelec 8351B: $9150 Bhphotovideo eBay
Pros: CEA2034 spinorama shows exceptionally flat response both on- and off-axis. Predicted in-room response is “as good as it gets” - should sound very neutral in nearly any room. Horizontal beamwidth of about ±50 degrees is described by the reviewer as exceptionally smooth, a model example of well-executed directivity control. Vertical directivity is nearly as good as horizontal, a benefit of its coaxial driver design that’s rare among non-coaxial monitors. Distortion at 86dB SPL/1m is remarkably low - the reviewer says it’s “better than many headphones.”
Cons: Deep bass distortion rises substantially at higher output (96dB SPL/1m) - the reviewer notes “deep bass suffers” below about 100Hz. A distortion spike also appears near 8-10kHz at that same higher output level. Cumulative spectral decay (waterfall) measurements show resonances around 1-2kHz. Very expensive.
Full Genelec 8351B review and specifications →
| App | Yes (GLM) |
|---|---|
| Bass Extension (-10dB) | 28Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 33Hz (measured, Audio Science Review) |
| Bluetooth | No |
| DSP | Yes |
| Dimensions | 17"H x 11.3"W x 10.9"D (431.8 x 287 x 276.9 mm) |
| Drivers | 8.6" woofer, 5" coaxial with tweeter midrange, 0.75" (19mm) coaxial tweeter |
| EQ | Yes (via GLM software) |
| Frequency Response | 32Hz - 40kHz (±1.5dB) (Manufacturer specified) |
| Inputs | XLR |
| Max SPL | 113dB @ 1m |
| Output Power | 550w Per Speaker |
| Weight | 31.1 lbs / 14.1 kg each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons