Short answer: the Genelec S360 for sheer output, the JBL 308P MKII for flat measured performance. The S360 is a large format 10” two-way with peak SPL over 128dB, though its 1.16 bass alignment Q is the highest in the batch and may bump near port tuning. The 308P MKII measures essentially flat from 45Hz to above 15kHz with almost no directivity error, but its limiter creates anomalies around 96dB and clean output tops out near 105dB SPL.
Why pick the JBL 308P MKII: A 1.8dB response span from 300Hz to 5kHz and 7.69 ideal-subwoofer score support unusually good tonal balance for an accessible studio monitor. Watch for: Amplifier hiss may be noticeable in quiet, close-range use.
Buy the Genelec S360 if sound quality is the priority over the price, or the JBL 308P MKII if the price is the priority over sound quality.
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Specifications Side By Side
| Genelec S360 | JBL 308P MKII | |
|---|---|---|
| Price | $9,550 per pair | $298 per pair |
| Ranked | #23 of 79 in Large Size Powered Bookshelf Speakers | #26 of 79 in Large Size Powered Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | 1” titanium compression tweeter, 10” cone woofer | 8” woofer, 1” neodymium tweeter |
| Dimensions | 20.9”H x 14.2”W x 14.2”D (530 x 360 x 360 mm) | 16.5”H x 10”W x 12.1”D (419.1 x 254 x 307.3 mm) |
| Weight | 66.1 lbs (30 kg) each | 17.9 lbs (8.1 kg) each |
| Amplifier Power | 350W total (250W woofer, 100W tweeter, Class D) | 112W total |
| Frequency Response | 36Hz-22kHz -6dB | 45Hz - 20kHz (+/-3dB) (Manufacturer specified) |
| Bass Extension (-3dB) | 39.6Hz (measured, Audio Science Review) | 42.5Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 35.6Hz (measured, Audio Science Review) | 37.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Warranty | 2 years (5 with product registration) | - |
| Country | Finland | - |
| Maximum SPL | Peak 128dB (manufacturer specified) | - |
| Spinorama Preference Score | 5.96 | 5.88 |
| Spinorama Preference Score with Perfect Sub | 7.70 | 7.69 |
| Inputs | XLR (analog), XLR AES/EBU (digital) | XLR, 1/4” TRS |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | No | Yes |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | Yes | No |
| Aux Input | No | No |
| Bluetooth | No | No |
| App | - | No |
| EQ | - | No |
| DSP | - | No |
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Prices on this page were last checked October 3, 2026 at 10:26 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
Genelec S360: $9,550 per pair B&H Photo Video eBay
Pros: A strong choice when professional output capability and listening distance matter. The measured 2.0dB response span from 300Hz to 5kHz, 39.6Hz -3dB extension and 7.70 ideal-subwoofer score support balanced sound, while GLM provides room-integration tools. It is capable of peak output over 128dB. Measured bass extension of 39.6Hz (-3dB).
Cons: The substantial enclosure and installation requirements make it excessive for many desks. Its tonal measurements do not surpass the best smaller monitors simply because it can play louder. Deep-bass reproduction still benefits from a subwoofer, especially in high-output systems. The fitted bass-alignment Q of 1.16 suggests a mild bump near the port tuning rather than a clean rolloff.
Full Genelec S360 review and specifications →
| AES Input | Yes |
|---|---|
| Amplifier Power | 350W total (250W woofer, 100W tweeter, Class D) |
| Aux Input | No |
| Bass Extension (-10dB) | 35.6Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 39.6Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| Country | Finland |
| Dimensions | 20.9”H x 14.2”W x 14.2”D (530 x 360 x 360 mm) |
| Drivers | 1” titanium compression tweeter, 10” cone woofer |
| Enclosure | ported |
| Frequency Response | 36Hz-22kHz -6dB |
| HDMI Input | No |
| Inputs | XLR (analog), XLR AES/EBU (digital) |
| Maximum SPL | Peak 128dB (manufacturer specified) |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.96 |
| Spinorama Preference Score with Perfect Sub | 7.70 |
| TRS Input | No |
| USB Input | No |
| Warranty | 2 years (5 with product registration) |
| Weight | 66.1 lbs (30 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JBL 308P MKII: $298 per pair Amazon B&H Photo Video eBay
Smaller models: the JBL 306P MKII (ranked lower, rated 4.1/5) and the JBL 305P MKII (rated 4.3/5).
Pros: A 1.8dB response span from 300Hz to 5kHz and 7.69 ideal-subwoofer score support unusually good tonal balance for an accessible studio monitor. Measured -3dB extension of 42.5Hz supplies useful musical bass, and the waveguide helps maintain consistent horizontal coverage. Measured bass extension of 42.5Hz (-3dB).
Cons: Amplifier hiss may be noticeable in quiet, close-range use. Bass distortion and output limits matter when playing loudly, despite the 8-inch woofer. Keep the tweeter near ear height; vertical crossover behavior is less forgiving than the best coaxial designs. A resonance around 18kHz and a slight dip around 1.4kHz.
Full JBL 308P MKII review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 112W total |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 37.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 42.5Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| 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) |
| HDMI Input | No |
| Inputs | XLR, 1/4” TRS |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.88 |
| Spinorama Preference Score with Perfect Sub | 7.69 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 17.9 lbs (8.1 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons