JBL M2 Master Reference Monitor vs Genelec 8040B

Short answer: the JBL M2 Master Reference Monitor, if you are buying new. The Genelec 8040B measures as well as it (#33 vs #35 of 68 powered bookshelf speakers, 4.3/5 vs 4.3/5) but is discontinued, so only consider it used; the JBL M2 Master Reference Monitor is still sold new at $15,000.

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. 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.

On the Genelec 8040B side: Based on the smaller sibling’s measured performance against others, it is ranked accordingly. Set against that: Very expensive.

Buy the JBL M2 Master Reference Monitor if you want one new; the Genelec 8040B is discontinued, so only look for it used.

Still deciding? The full Powered Home rankings cover every ranked option.

Specifications Side By Side

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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 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
  • Official JBL M2 Page
• Reviews, Comparisons and Sound Samples
  • Erin’s Audio Corner: JBL M2 Review More from Erin’s Audio Corner →
  • Erin’s Audio Corner Website: JBL M2
  • Erin’s Audio Corner Measurements (spinorama.org)
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Genelec 8040B: $2,790 per pair Discontinued B&H Photo Video eBay

Newer model: the Genelec 8340A. It’s likely to perform similarly, though we don’t have measurements to confirm that yet. It uses the same cabinet and woofer size, adding GLM room calibration and an AES/EBU digital input.

Pros: A compact professional monitor with balanced XLR input and analog room-adjustment controls. The manufacturer’s 41Hz limit is specified at -6dB, offering a useful reference for system planning without confusing it with a measured -3dB point.

Cons: It lacks GLM calibration and consumer streaming inputs. The balanced XLR connection may require an interface or controller for a typical desktop source. It is expensive. Discontinued.

Full Genelec 8040B review and specifications →

AES Input	No
Amplifier Power	180w Per Speaker
App	No
Aux Input	No
Bluetooth	No
Coaxial Input	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)
HDMI Input	No
Inputs	XLR
Optical Input	No
RCA Input	No
TRS Input	No
USB Input	No
Weight	20.7 lbs (9.4 kg) each
XLR Input	Yes

• Links
  • Official Genelec 8040B Product Page
• Reviews, Comparisons and Sound Samples
  • No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
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