Short answer: the Genelec 8040B for better sound quality, the JBL 308P MKII for the lower price. The Genelec 8040B ranks #9 of 62 powered bookshelf speakers at $2350. The JBL 308P MKII ranks #26 at $498, $1852 cheaper.
What the Genelec 8040B offers: Based on their smaller speaker’s performance against others, I’m ranking this accordingly. Watch for: Very expensive
What the JBL 308P MKII offers: CEA2034 spinorama shows an essentially flat on-axis response from 45Hz to above 15kHz, with almost no directivity error. Dual 56W Class D amps drive an 8” woofer and 1” tweeter with a smooth, imperceptible crossover transition. Excellent value at $498 per pair. Watch for: A resonance shows up around 18kHz and a slight dip around 1.4kHz. An electronic limiter creates measurable anomalies around 96dB, and maximum clean output tops out around 105dB SPL before heavy limiting kicks in. Some audible tweeter hiss at close range.
Buy the Genelec 8040B if sound quality matters more than the price. Buy the JBL 308P MKII if the price matters more than sound quality.
Specifications Side By Side
| Genelec 8040B | JBL 308P MKII | |
|---|---|---|
| Price | $2350 | $498 |
| Ranked | #9 of 62 in Large Size Powered Bookshelf Speakers | #26 of 62 in Large Size Powered Bookshelf Speakers |
| Dimensions | 14.4"H x 9.3"W x 8.8"D (365.8 x 236.2 x 223.5 mm) | 16.5"H x 10"W x 12.1"D (419.1 x 254 x 307.3 mm) |
| Frequency Response | 41Hz - 25kHz (-6dB) (Manufacturer specified) | 45Hz - 20kHz (+/-3dB) (Manufacturer specified) |
| Inputs | XLR | - |
| Weight | 20.7 lbs / 9.4 kg each | not published by manufacturer |
| Drivers | 6.5" (165mm) woofer | 8" woofer, 1" neodymium tweeter |
| App | No | No |
| Bluetooth | No | - |
| EQ | Yes (Room adjustment) | No |
| DSP | No | No |
| Output Power | 180w Per Speaker | 112W total |
| Bass Extension (-3dB) | - | 82Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | - | 60Hz (measured, Audio Science Review) |
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Prices on this page were last checked August 24, 2026 at 6:53 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
Genelec 8040B: $2350 Bhphotovideo eBay
Pros: Based on their smaller speaker’s performance against others, I’m ranking this accordingly.
Cons: Very expensive
Full Genelec 8040B review and specifications →
| App | No |
|---|---|
| Bluetooth | No |
| DSP | No |
| Dimensions | 14.4"H x 9.3"W x 8.8"D (365.8 x 236.2 x 223.5 mm) |
| Drivers | 6.5" (165mm) woofer |
| EQ | Yes (Room adjustment) |
| Frequency Response | 41Hz - 25kHz (-6dB) (Manufacturer specified) |
| Inputs | XLR |
| Output Power | 180w Per Speaker |
| Weight | 20.7 lbs / 9.4 kg each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JBL 308P MKII: $498 Bhphotovideo eBay
Pros: CEA2034 spinorama shows an essentially flat on-axis response from 45Hz to above 15kHz, with almost no directivity error. Dual 56W Class D amps drive an 8” woofer and 1” tweeter with a smooth, imperceptible crossover transition. Excellent value at $498 per pair.
Cons: A resonance shows up around 18kHz and a slight dip around 1.4kHz. An electronic limiter creates measurable anomalies around 96dB, and maximum clean output tops out around 105dB SPL before heavy limiting kicks in. Some audible tweeter hiss at close range.
Full JBL 308P MKII review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 82Hz (measured, Audio Science Review) |
| DSP | No |
| Dimensions | 16.5"H x 10"W x 12.1"D (419.1 x 254 x 307.3 mm) |
| Drivers | 8" woofer, 1" neodymium tweeter |
| EQ | No |
| Frequency Response | 45Hz - 20kHz (+/-3dB) (Manufacturer specified) |
| Output Power | 112W total |
| Weight | not published by manufacturer |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons