Short answer: the JBL M2 Master Reference Monitor. It ranks #1 of 66 powered bookshelf speakers by sound quality; the JBL 708P ranks #22.
What the JBL 708P offers: CEA2034 spinorama shows extremely good frequency response both on- and off-axis, with excellent horizontal directivity. Bi-amplified 500W design (250W woofer, 250W compression driver) handles an 8” woofer and JBL’s 2409H compression tweeter. Watch for: A port resonance creates a mild rise around 600-900Hz. Vertical dispersion is narrower than horizontal, so staying within a few degrees of the tweeter axis matters. Distortion climbs at 96dB SPL, with the tweeter reaching about 2.5% THD at elevated levels.
What the JBL M2 Master Reference Monitor offers: Flagship quasi-active two-way with a 15-inch 2216Nd woofer and D2 compression driver crossing near 800Hz through a large Image Control Waveguide. Erin measured F3 at 34Hz, less than 1% THD at 86 and 96dB, and only about 0.25dB compression by 102dB. Radiation stays broadly constant to roughly +/-60 degrees through 8-9kHz, producing excellent direct/reflected-sound agreement and enormous clean dynamic range. External DSP amplification permits precise factory crossover, phase and response correction. Watch for: The required bi-amplification/DSP ecosystem is expensive and complex; Erin’s Crown I-Tech 5000HD had fans loud enough that he moved it to another room for measurements. Midrange resonances remain visible despite the otherwise neutral response, and treble dispersion narrows above roughly 9kHz before beaming above 12kHz. Each 130-pound enclosure is physically imposing. This is an amplified system, so passive impedance and sensitivity figures are not applicable to the complete configured product.
Buy the JBL 708P if the price matters more than sound quality. Buy the JBL M2 Master Reference Monitor if sound quality matters more than the price.
Specifications Side By Side
| JBL 708P | JBL M2 Master Reference Monitor | |
|---|---|---|
| Price | $4000 | Contact dealer |
| Ranked | #22 of 66 in Large Size Powered Bookshelf Speakers | #1 of 66 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 82Hz (measured, Audio Science Review) | 34Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) | 21.0Hz (measured, Erin’s Audio Corner) |
| Dimensions | 17.2"H x 9.8"W x 11.5"D (438 x 248 x 292 mm) | - |
| Frequency Response | 41Hz - 25kHz (+/-3dB) (Manufacturer specified) | - |
| Weight | 25.1 lbs / 11.4 kg each | 130 lb each |
| Drivers | 8" woofer, 2409H 1" compression driver | 15" 2216Nd woofer; D2 compression driver in Image Control Waveguide |
| App | No | - |
| EQ | No | - |
| DSP | No | - |
| Output Power | 500W total (250W woofer, 250W tweeter) | - |
| Sensitivity | - | Not applicable (externally bi-amplified DSP system) |
| Crossover | - | 800Hz active DSP |
| Max SPL | - | 123dB manufacturer specified |
| Amplification | - | External two-channel amplification and JBL DSP tuning required |
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The Two Speakers In Full
JBL 708P: $4000 Bhphotovideo eBay
Pros: CEA2034 spinorama shows extremely good frequency response both on- and off-axis, with excellent horizontal directivity. Bi-amplified 500W design (250W woofer, 250W compression driver) handles an 8” woofer and JBL’s 2409H compression tweeter.
Cons: A port resonance creates a mild rise around 600-900Hz. Vertical dispersion is narrower than horizontal, so staying within a few degrees of the tweeter axis matters. Distortion climbs at 96dB SPL, with the tweeter reaching about 2.5% THD at elevated levels.
Full JBL 708P review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 82Hz (measured, Audio Science Review) |
| DSP | No |
| Dimensions | 17.2"H x 9.8"W x 11.5"D (438 x 248 x 292 mm) |
| Drivers | 8" woofer, 2409H 1" compression driver |
| EQ | No |
| Frequency Response | 41Hz - 25kHz (+/-3dB) (Manufacturer specified) |
| Output Power | 500W total (250W woofer, 250W tweeter) |
| Weight | 25.1 lbs / 11.4 kg each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JBL M2 Master Reference Monitor: Contact dealer JBL Professional Dealer Locator eBay
Pros: Flagship quasi-active two-way with a 15-inch 2216Nd woofer and D2 compression driver crossing near 800Hz through a large Image Control Waveguide. Erin measured F3 at 34Hz, less than 1% THD at 86 and 96dB, and only about 0.25dB compression by 102dB. Radiation stays broadly constant to roughly +/-60 degrees through 8-9kHz, producing excellent direct/reflected-sound agreement and enormous clean dynamic range. External DSP amplification permits precise factory crossover, phase and response correction.
Cons: The required bi-amplification/DSP ecosystem is expensive and complex; Erin’s Crown I-Tech 5000HD had fans loud enough that he moved it to another room for measurements. Midrange resonances remain visible despite the otherwise neutral response, and treble dispersion narrows above roughly 9kHz before beaming above 12kHz. Each 130-pound enclosure is physically imposing. This is an amplified system, so passive impedance and sensitivity figures are not applicable to the complete configured product.
Full JBL M2 Master Reference Monitor review and specifications →
| Amplification | External two-channel amplification and JBL DSP tuning required |
|---|---|
| Bass Extension (-10dB) | 21.0Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 34Hz (measured, Erin's Audio Corner) |
| Crossover | 800Hz active DSP |
| Drivers | 15" 2216Nd woofer; D2 compression driver in Image Control Waveguide |
| Max SPL | 123dB manufacturer specified |
| Sensitivity | Not applicable (externally bi-amplified DSP system) |
| Weight | 130 lb each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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