Short answer: the JBL M2 Master Reference Monitor. It ranks #56 of 113 powered bookshelf speakers by sound quality (rated 4.3/5) at $15,000 and is still sold new; the JBL 4329P ranks #71 (rated 4.1/5) and is discontinued, so it is only an option used.
Why pick the JBL 4329P: Measured -3dB extension of 32.2Hz provides deeper native bass than the smaller 4305P. It keeps a wired aux input, which the JBL M2 Master Reference Monitor lacks. The tradeoff: The measured 4.5dB response span from 300Hz to 5kHz includes a notable midrange dip, so it is not as neutral as its size and price might suggest.
What the JBL M2 Master Reference Monitor does well: A high-output specialist: Erin’s low-distortion and compression tests support considerable dynamic capability, beyond what a single preference score captures. Watch for: Its 4.1dB response span from 300Hz to 5kHz and 6.58 ideal-subwoofer score do not support a top tonal-accuracy ranking.
Buy the JBL M2 Master Reference Monitor. It is rated higher for sound quality; the JBL 4329P is no longer sold new.
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Specifications Side By Side
| JBL 4329P | JBL M2 Master Reference Monitor | |
|---|---|---|
| Price | $4,500 per pair Discontinued | $15,000 per pair |
| Ranked | #71 of 113 in Large Size Powered Bookshelf Speakers | #56 of 113 in Large Size Powered Bookshelf Speakers |
| Drivers | 8” midwoofer, 1” compression driver with JBL High-Definition Imaging horn | 15” 2216Nd woofer; D2 compression driver in Image Control Waveguide |
| Dimensions | 20.3”H x 12.6”W x 12.7”D | 49.4”H x 20”W x 14”D (1256 x 508 x 355.6 mm) |
| Weight | 34.4 lbs (15.6 kg) (primary), 34.4 lbs (15.6 kg) (secondary) | 130.1 lbs (59 kg) each |
| Sensitivity | 102.2dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 31Hz (measured, Erin’s Audio Corner) | 34Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 27Hz (measured, Erin’s Audio Corner) | 21.0Hz (measured, Erin’s Audio Corner) |
| Frequency Response | 30Hz - 20kHz (anechoic, manufacturer specified) | 20Hz - 40kHz (±3dB) (Manufacturer specified) |
| Inputs | USB, Optical, Bluetooth, Analog, 3.5mm, AirPlay 2 | None (passive cabinet driven by a matched Crown amplifier via speaker-level connection) |
| Bluetooth Codecs | SBC, aptX Adaptive | - |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 5.40 | 5.74 |
| Spinorama Preference Score with Perfect Sub | 6.72 | 6.58 |
| XLR Input | No | No |
| RCA Input | No | No |
| TRS Input | No | No |
| Optical Input | Yes | No |
| Coaxial Input | No | No |
| USB Input | Yes | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | Yes | No |
| Amplifier Power | 300W RMS per speaker (600W total system power) | External two-channel amplification and JBL DSP tuning required |
| Bluetooth | Yes | No |
| Bluetooth Version | 5.3 | - |
| Crossover Frequency | - | 800Hz active DSP |
| Maximum SPL | - | 123dB manufacturer specified |
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Prices on this page were last checked October 7, 2026 at 9:25 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 4329P: $4,500 per pair Discontinued eBay
Pros: Measured -3dB extension of 32.2Hz provides deeper native bass than the smaller 4305P. Integrated amplification and streaming make it convenient for a full-range living-room system, and its larger format is useful when scale matters. Measured bass extension of 31Hz (-3dB), with a measured sensitivity of 102.2dB.
Cons: The measured 4.5dB response span from 300Hz to 5kHz includes a notable midrange dip, so it is not as neutral as its size and price might suggest. Its 6.72 ideal-subwoofer score trails the 4305P. There is no HDMI connection for the simplest TV hookup. Discontinued.
Full JBL 4329P review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 300W RMS per speaker (600W total system power) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 27Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 31Hz (measured, Erin’s Audio Corner) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, aptX Adaptive |
| Bluetooth Version | 5.3 |
| Coaxial Input | No |
| Dimensions | 20.3”H x 12.6”W x 12.7”D |
| Drivers | 8” midwoofer, 1” compression driver with JBL High-Definition Imaging horn |
| Frequency Response | 30Hz - 20kHz (anechoic, manufacturer specified) |
| HDMI Input | No |
| Inputs | USB, Optical, Bluetooth, Analog, 3.5mm, AirPlay 2 |
| Optical Input | Yes |
| RCA Input | No |
| Sensitivity | 102.2dB (measured at 0.3V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 5.40 |
| Spinorama Preference Score with Perfect Sub | 6.72 |
| TRS Input | No |
| USB Input | Yes |
| Weight | 34.4 lbs (15.6 kg) (primary), 34.4 lbs (15.6 kg) (secondary) |
| Woofer Cabinet | ported |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JBL M2 Master Reference Monitor: $15,000 per pair JBL Professional Dealer Locator eBay
Pros: A high-output specialist: Erin’s low-distortion and compression tests support considerable dynamic capability, beyond what a single preference score captures. Measured -3dB extension is 33.7Hz. The large woofer and waveguide are particularly useful for greater listening distances. Measured bass extension of 34Hz (-3dB).
Cons: Its 4.1dB response span from 300Hz to 5kHz and 6.58 ideal-subwoofer score do not support a top tonal-accuracy ranking. It requires the correct external amplification and DSP rather than a simple built-in amplifier. The very large cabinet, installation cost and possible amplifier fan noise make it impractical for most desks.
Full JBL M2 Master Reference Monitor review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | External two-channel amplification and JBL DSP tuning required |
| Aux Input | No |
| Bass Extension (-10dB) | 21.0Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 34Hz (measured, Erin’s Audio Corner) |
| Bluetooth | No |
| Coaxial Input | No |
| Crossover Frequency | 800Hz active DSP |
| Dimensions | 49.4”H x 20”W x 14”D (1256 x 508 x 355.6 mm) |
| Drivers | 15” 2216Nd woofer; D2 compression driver in Image Control Waveguide |
| Frequency Response | 20Hz - 40kHz (±3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | None (passive cabinet driven by a matched Crown amplifier via speaker-level connection) |
| Maximum SPL | 123dB manufacturer specified |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.74 |
| Spinorama Preference Score with Perfect Sub | 6.58 |
| TRS Input | No |
| USB Input | No |
| Weight | 130.1 lbs (59 kg) each |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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