Short answer: the JBL 708P for measured accuracy; the 4305P for a smaller active monitor. The 708P shows extremely good on- and off-axis response with excellent horizontal directivity, though a port resonance creates a mild rise around 600-900Hz. The 4305P reaches a 45Hz F3, but its limiter becomes conspicuous around 96dB.
On the JBL 4305P side: Erin measured a 45Hz F3 and heard solid 40–50Hz in-room extension (excellent for a compact 5.25-inch active monitor). Set against that: The limiter becomes conspicuous around 96dB: Erin measured about 8dB lost near 50Hz at the highest drive and achieved roughly 93dB unweighted at 2m in-room.
Buy the JBL 4305P. It is rated higher for sound quality than the JBL 708P and costs less, which makes it the one to get unless you need something the other one does better.
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Specifications Side By Side
| JBL 4305P | JBL 708P | |
|---|---|---|
| Price | $1,499.99 per pair | $4000 per pair |
| Ranked | #28 of 68 in Large Size Powered Bookshelf Speakers | #39 of 68 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 45Hz (measured, Erin’s Audio Corner) | 43.9Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 40.5Hz (measured, Erin’s Audio Corner) | 35.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Maximum SPL | ~93dB at 2m in-room before limiting (measured, Erin’s Audio Corner) | - |
| Amplifier Power | 300W system: 125W LF + 25W HF per speaker | 500W total (250W woofer, 250W tweeter) |
| Drivers | 5.25-inch pulp woofer; 1-inch annular compression driver | 8” woofer, 2409H 1” compression driver |
| Dimensions | 13.2H x 8.3W x 8.8D inches | 17.2”H x 9.8”W x 11.5”D (438 x 248 x 292 mm) |
| Spinorama Preference Score | 5.44 | 5.03 |
| Spinorama Preference Score with Perfect Sub | 7.45 | 6.91 |
| Inputs | XLR/TRS combo, 3.5mm Aux, Optical, USB-B, Ethernet | XLR/TRS combo (analog), XLR AES3 (digital) |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | Yes | Yes |
| Optical Input | Yes | No |
| Coaxial Input | No | No |
| USB Input | Yes | No |
| HDMI Input | No | No |
| AES Input | No | Yes |
| Aux Input | Yes | No |
| Weight | Primary 14.6 lbs (6.6 kg), Secondary 14.1 lbs (6.4 kg) | 25.1 lbs (11.4 kg) each |
| Bluetooth | Yes, 5.1 | No |
| Frequency Response | 45Hz - 25kHz (-6dB) (Manufacturer specified) | 41Hz - 25kHz (+/-3dB) (Manufacturer specified) |
| App | - | No |
| EQ | - | No |
| DSP | - | No |
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Prices on this page were last checked October 2, 2026 at 10:18 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
JBL 4305P: $1,499.99 per pair Amazon JBL eBay
Pros: The measured 1.5dB response span from 300Hz to 5kHz supports even mids, with a 7.45 ideal-subwoofer score and 45.4Hz -3dB bass extension. Integrated consumer connectivity makes this a more convenient living-room system than many studio monitors. Measured bass extension of 45Hz (-3dB).
Cons: Crossover-region directivity changes mean the narrow on-axis span does not describe every listening angle. Limiting becomes relevant at high output, particularly with bass-heavy music. It suits near- to midfield listening better than the largest high-output systems here. Erin measured about 8dB lost near 50Hz at the highest drive level and reached roughly 93dB unweighted at 2m in-room.
Full JBL 4305P review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 300W system: 125W LF + 25W HF per speaker |
| Aux Input | Yes |
| Bass Extension (-10dB) | 40.5Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 45Hz (measured, Erin’s Audio Corner) |
| Bluetooth | Yes, 5.1 |
| Coaxial Input | No |
| Dimensions | 13.2H x 8.3W x 8.8D inches |
| Drivers | 5.25-inch pulp woofer; 1-inch annular compression driver |
| Frequency Response | 45Hz - 25kHz (-6dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR/TRS combo, 3.5mm Aux, Optical, USB-B, Ethernet |
| Maximum SPL | ~93dB at 2m in-room before limiting (measured, Erin’s Audio Corner) |
| Optical Input | Yes |
| RCA Input | No |
| Spinorama Preference Score | 5.44 |
| Spinorama Preference Score with Perfect Sub | 7.45 |
| TRS Input | Yes |
| USB Input | Yes |
| Weight | Primary 14.6 lbs (6.6 kg), Secondary 14.1 lbs (6.4 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JBL 708P: $4000 per pair B&H Photo Video eBay
Pros: Erin’s measurements give 43.9Hz -3dB extension and a 6.91 ideal-subwoofer score, with useful bass from a professional active monitor. The waveguide and onboard processing make it a practical choice for a carefully installed studio system. Measured bass extension of 43.9Hz (-3dB).
Cons: The 2.6dB response span from 300Hz to 5kHz includes audible-relevance irregularities, with port-region features and vertical crossover sensitivity. High-level distortion remains a constraint. Its professional positioning and amplifier power do not make it automatically more neutral than the cheaper 308P MKII. A port resonance adds a mild rise around 600 to 900Hz, and vertical dispersion is narrower than horizontal, so stay within a few degrees of the tweeter axis.
Full JBL 708P review and specifications →
| AES Input | Yes |
|---|---|
| Amplifier Power | 500W total (250W woofer, 250W tweeter) |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 35.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 43.9Hz (measured, Erin’s Audio Corner) |
| Bluetooth | No |
| Coaxial Input | No |
| 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) |
| HDMI Input | No |
| Inputs | XLR/TRS combo (analog), XLR AES3 (digital) |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.03 |
| Spinorama Preference Score with Perfect Sub | 6.91 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 25.1 lbs (11.4 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons