Genelec 8351B vs JBL 4305P

Short answer: the Genelec 8351B for flat response, the JBL 4305P for compact bass extension. The 8351B’s spinorama is exceptionally flat on and off axis, but deep bass distortion rises at 96dB SPL/1m and suffers below about 100Hz. The 4305P reaches a measured 45Hz F3 with solid 40-50Hz in-room extension, though its limiter turns conspicuous around 96dB, losing about 8dB near 50Hz at the highest drive.

What the JBL 4305P gets right: Erin measured a 45Hz F3 and heard solid 40–50Hz in-room extension (excellent for a compact 5.25-inch active monitor). The catch: 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 Genelec 8351B if sound quality is the priority over the price, or the JBL 4305P if the price is the priority over sound quality.

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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 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
  • Official JBL product page
• Reviews, Comparisons and Sound Samples
  • Erin’s Audio Corner video review More from Erin’s Audio Corner →
  • Erin’s Audio Corner written measurements
  • Erin’s Audio Corner Measurements (spinorama.org)
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