Genelec 8351B vs JBL 708P

Short answer: neither is a weak measurement performer; the Genelec 8351B is flat on and off axis, the JBL 708P excels horizontally. The 8351B’s spinorama is exceptionally flat on and off axis, though deep bass distortion rises at 96dB SPL/1m and suffers below about 100Hz. The 708P also measures extremely well on and off axis with excellent horizontal directivity, but a port resonance creates a mild rise around 600-900Hz.

Buy the Genelec 8351B. It is rated higher for sound quality, and the $5,150 you would save on the JBL 708P does not close the gap.

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Specifications Side By Side

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The Two Speakers In Full

Genelec 8351B: $9150 per pair B&H Photo Video eBay

Pros: The vertical ASR measurement scores 7.75 with an ideal subwoofer and reaches 35.2Hz at -3dB. Coaxial midrange and treble help maintain consistent sound as the listening angle changes. Low measured distortion at ordinary listening levels and GLM calibration make it a strong precision-monitoring choice. Measured bass extension of 33Hz (-3dB).

Cons: Bass distortion increases at higher playback levels, so a subwoofer remains useful for demanding material. Upper-treble distortion in the test also cautions against assuming unlimited output. Calibration hardware adds to an already expensive system, and the quoted result is for the measured vertical orientation.

Full Genelec 8351B review and specifications →

AES Input	No
Amplifier Power	550w Per Speaker
App	Yes (GLM)
Aux Input	No
Bass Extension (-10dB)	28Hz (measured, Audio Science Review)
Bass Extension (-3dB)	33Hz (measured, Audio Science Review)
Bluetooth	No
Coaxial Input	No
DSP	Yes
Dimensions	17”H x 11.3”W x 10.9”D (431.8 x 287 x 276.9 mm)
Drivers	8.6” woofer, 5” coaxial with tweeter midrange, 0.75” (19mm) coaxial tweeter
EQ	Yes (via GLM software)
Frequency Response	32Hz - 40kHz (±1.5dB) (Manufacturer specified)
HDMI Input	No
Inputs	XLR
Maximum SPL	113dB @ 1m (manufacturer specified)
Optical Input	No
RCA Input	No
TRS Input	No
USB Input	No
Weight	31.1 lbs (14.1 kg) each
XLR Input	Yes

• Links
  • Official Genelec 8351B Product Page
• Reviews, Comparisons and Sound Samples
  • Audio Science Review Measurements More from Audio Science Review →
  • Audio Science Review Measurements (spinorama.org)
• Head-to-Head Comparisons
  • Genelec 8351B vs Neumann KH420
  • Genelec 8351B vs Genelec 8361A
  • Genelec 8351B vs Neumann KH 150
  • Genelec 8351B vs Aalto Speakers Aalto 3 Active Pro
  • Genelec 8351B vs Neumann KH 310 A
  • Genelec 8351B vs HEDD Type 20 MK2
  • Genelec 8351B vs SHIVAUDYO Point Zero
  • Genelec 8351B vs JBL 308P MKII
  • See all 27 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
  • Official JBL 708P Product Page
• Reviews, Comparisons and Sound Samples
  • Audio Science Review Measurements More from Audio Science Review →
  • Erin’s Audio Corner Measurements (spinorama.org) More from Erin’s Audio Corner →
  • Erin’s Audio Corner: JBL 708P Master Reference Monitor Review
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