Genelec 8351B vs HEDD Type 20 MK2

Short answer: both are flat on axis; the Genelec 8351B holds its response off axis, while the HEDD Type 20 MK2 has the smoother directivity index. 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 HEDD is nicely flat on axis, but its horizontal beamwidth is asymmetric at +60/-80 degrees and narrows above 10kHz.

The case for the Genelec 8351B: CEA2034 spinorama shows exceptionally flat response both on- and off-axis. The catch: Deep bass distortion rises substantially at higher output (96dB SPL/1m) - the reviewer notes “deep bass suffers” below about 100Hz.

What the HEDD Type 20 MK2 gets right: CEA2034 spinorama shows a nice flat on-axis response with a very smooth directivity index. The catch: Horizontal beamwidth is asymmetric (+60/-80 degrees depending on reference point) and narrows above 10kHz.

Buy the Genelec 8351B. It is rated higher for sound quality, and saving $4350 with the HEDD Type 20 MK2 does not make up for the sound-quality gap.

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Specifications Side By Side

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How Genelec 8351B compares with other leading options:

• Genelec 8351B vs Neumann KH420
• Genelec 8351B vs Genelec 8361A
• Genelec 8351B vs Neumann KH 150
• Genelec 8351B vs Neumann KH 310 A
• Genelec 8351B vs SHIVAUDYO Point Zero

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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 Neumann KH 310 A
  • Genelec 8351B vs SHIVAUDYO Point Zero
  • Genelec 8351B vs JBL 308P MKII
  • Genelec 8351B vs Yamaha HS8
  • Genelec 8351B vs Kali Audio LP-6 V2
  • See all 24 comparisons

HEDD Type 20 MK2: $4800 per pair B&H Photo Video eBay

Pros: The measured ported configuration reaches 35.2Hz at -3dB and scores 6.92 with an ideal subwoofer. A 2.4dB response span from 300Hz to 5kHz supports broadly balanced mids, while ported operation reduces deep-bass strain compared with the sealed setting in the review. Measured bass extension of 32Hz (-3dB).

Cons: These results are for ported operation, not every bass or phase setting. Horizontal asymmetry and vertical crossover behavior make orientation and listening position important. Distortion rises at higher output, and linear-phase processing can add latency for live monitoring.

Full HEDD Type 20 MK2 review and specifications →

AES Input	Yes
Amplifier Power	900W (3x300W)
App	Yes (HEDD CTRL)
Aux Input	No
Bass Extension (-10dB)	26Hz (measured, Audio Science Review)
Bass Extension (-3dB)	32Hz (measured, Audio Science Review)
Bluetooth	No
Coaxial Input	No
DSP	Yes (96kHz/32-bit)
Dimensions	14.1"H x 11"W x 13.3"D (358.1 x 279.4 x 337.8 mm)
Drivers	7" honeycomb composite woofer, 4" honeycomb composite midrange, HEDD AMT (Air Motion Transformer) tweeter
EQ	Yes (Desk filter, shelf filters)
Frequency Response	32Hz - 40kHz (Manufacturer specified)
HDMI Input	No
Inputs	XLR (Analog/AES)
Maximum SPL	120dB @ 1m (per pair) (manufacturer specified)
Optical Input	No
Outputs	XLR (AES pass-through)
RCA Input	No
Spinorama Preference Score	5.34
Spinorama Preference Score with Perfect Sub	6.92
TRS Input	No
USB Input	No
Weight	34 lbs (15.4 kg) each
XLR Input	Yes

• Links
  • Official HEDD Type 20 MK2 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
  • HEDD Type 20 MK2 vs Neumann KH 310 A
  • HEDD Type 20 MK2 vs Buchardt A500
  • HEDD Type 20 MK2 vs JBL 308P MKII
  • HEDD Type 20 MK2 vs Yamaha HS8
  • HEDD Type 20 MK2 vs Buchardt A10
  • HEDD Type 20 MK2 vs Kali Audio LP-6 V2
  • HEDD Type 20 MK2 vs Kali Audio IN-8 V2
  • HEDD Type 20 MK2 vs Genelec 8050B
  • See all 24 comparisons