Sigberg Audio INKOGNITO 12 vs REL Acoustics S/850

Short answer: the Sigberg Audio INKOGNITO 12. It ranks #64 of 212 subwoofers by sound quality, rated 3.8/5, at $3,456.29; the REL Acoustics S/850 ranks #110, rated 3.7/5, and costs $3,999, so there is not much of a tradeoff to weigh.

What the Sigberg Audio INKOGNITO 12 does well: Ultra-slim 12-inch sealed design (6.69” depth) with 250W RMS reaches 23Hz.

What the REL Acoustics S/850 does well: Front-firing 12 inch carbon and aluminum driver plus a down-firing 12 inch passive radiator, driven by an 850W RMS Class D amplifier (1,000W peak). The catch: No independent measurements yet, so its output can’t be compared with ranked subwoofers; the rating is estimated from the measured REL Acoustics R-528, an older 12 inch REL that averaged 112.8dB in the CEA-2010 bands but fell to 92.7dB at 25Hz.

Buy the Sigberg Audio INKOGNITO 12. It is rated higher for sound quality than the REL Acoustics S/850 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.

About the ratings: the REL Acoustics S/850’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 3.4 to 4.0, so this verdict could change once it is measured.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Related Speaker Comparisons

More worthwhile head-to-heads for Sigberg Audio INKOGNITO 12:

• Monoprice SW-15 vs Sigberg Audio INKOGNITO 12
• SVS SB-3000 vs Sigberg Audio INKOGNITO 12
• Bowers & Wilkins DB4S vs Sigberg Audio INKOGNITO 12
• Sigberg Audio INKOGNITO 12 vs REL Acoustics S/550
• Sigberg Audio INKOGNITO 12 vs Sigberg Audio INKOGNITO 10

Prices on this page were last checked October 11, 2026 at 4:59 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

Sigberg Audio INKOGNITO 12: $3,456.29 Sigberg Audio eBay

Same family: the Sigberg Audio INKOGNITO 10 (smaller subwoofer, ranked lower, rated 3.4/5).

Pros: Ultra-slim 12-inch sealed design (6.69” depth) with 250W RMS reaches 23Hz. Real quality accurate bass with minimal distortion and 10-band parametric EQ. Wall-mountable or under-furniture placement without sound loss. Premium European build quality.

Notes: low profile (<8in)

Full Sigberg Audio INKOGNITO 12 review and specifications →

AES Input	No
Amplifier Power	250W RMS
Aux Input	No
CEA-2010-A Average (40-80Hz)	114.4 dB
Cabinet Color	black, white
Coaxial Input	No
Country	Norway
Dimensions	21.3”H x 25.6”W x 6.7”D (539.8 x 650.0 x 169.9 mm)
Drivers	12” (305mm) driver
Enclosure	sealed
Frequency Response	23-250Hz, ±3dB
HDMI Input	No
Inputs	XLR (balanced, in plus through), RCA, speaker-level, USB (config only)
Measurement Source	Manufacturer
Optical Input	No
Output SPL at 20 Hz	92.0 dB
Output SPL at 25 Hz	98.0 dB
Output SPL at 31.5 Hz	104.0 dB
Output SPL at 40 Hz	112.5 dB
Output SPL at 50 Hz	114.0 dB
Output SPL at 63 Hz	115.0 dB
Output SPL at 80 Hz	116.0 dB
RCA Input	Yes
TRS Input	No
USB Input	Yes
Warranty	5
Weight	48.5 lbs (22.0 kg)
XLR Input	Yes

• Links
  • Sigberg Audio INKOGNITO 12 Website
• Reviews, Comparisons and Sound Samples
  • These figures are manufacturer-specified rather than independently measured.
• Head-to-Head Comparisons
  • Sigberg Audio INKOGNITO 12 vs Bowers & Wilkins DB4S
  • Sigberg Audio INKOGNITO 12 vs SVS SB-3000
  • Sigberg Audio INKOGNITO 12 vs Monoprice SW-15
  • Sigberg Audio INKOGNITO 12 vs REL Acoustics S/550
  • Sigberg Audio INKOGNITO 12 vs Sigberg Audio INKOGNITO 10
  • Sigberg Audio INKOGNITO 12 vs Genelec 7360A

REL Acoustics S/850: $3,999.00 Estimated REL Acoustics eBay

Older model: the REL Acoustics R-528 (ranked higher, rated 3.7/5). See every REL S and Reference Series generation.

Same family: the REL Acoustics S/550 (smaller subwoofer, ranked lower, estimated 3.5/5), the REL Acoustics Carbon Special Black Label (larger subwoofer, estimated 3.9/5) and the REL Acoustics 212 Black Label (larger subwoofer, estimated 4.2/5).

Pros: Front-firing 12 inch carbon and aluminum driver plus a down-firing 12 inch passive radiator, driven by an 850W RMS Class D amplifier (1,000W peak). REL rates it at 19Hz at the -6dB point. High level Speakon, RCA and LFE RCA/XLR inputs, and REL’s Airship wireless option, make it easy to blend with stereo and theater systems.

Cons: No independent measurements yet, so its output can’t be compared with ranked subwoofers; the rating is estimated from the measured REL Acoustics R-528, an older 12 inch REL that averaged 112.8dB in the CEA-2010 bands but fell to 92.7dB at 25Hz. At 42.5 kg it is very heavy, and it costs far more than measured 12 inch subwoofers with more output.

Full REL Acoustics S/850 review and specifications →

Released	Sep 2025 (1 year ago)
Amplifier Power	850W RMS (1,000W peak)
Cabinet Color	black, white
Country	United Kingdom
Dimensions	16.1”H x 19.2”W x 21.3”D (410 x 488 x 540 mm)
Drivers	12” (305mm) driver, 12” passive radiator
Enclosure	passive radiator
Frequency Response	19Hz (-6dB, manufacturer specified)
Warranty	3
Weight	93.7 lbs (42.5 kg)

• Links
  • REL Acoustics S/850 Website
• 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.
• Head-to-Head Comparisons
  • REL Acoustics S/850 vs REL Acoustics S/550
  • REL Acoustics S/850 vs KEF Reference 8b
  • REL Acoustics S/850 vs Sigberg Audio 10D
  • REL Acoustics S/850 vs Paradigm XR11