BK Electronics Monolith-DF vs JTR Speakers Growler (2015)

Last updated: October 21, 2026

Short answer: both are discontinued, so this only matters if you are buying used. Used, the JTR Speakers Growler (2015) is the better pick: it ranks #13 of 143 subwoofers by sound quality (rated 4.5/5), against #141 (rated 3.3/5) for the BK Electronics Monolith-DF. If you want one new, the JTR Speakers Orbit Shifter PRO ranks #1 at $4,499.

BK Electronics Monolith-DF vs JTR Speakers Growler (2015)

What the BK Electronics Monolith-DF does well: A down ported 12 inch subwoofer with balanced XLR and RCA inputs at a low price, now discontinued. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority.

The JTR Speakers Growler (2015) is the better-sounding pick. A 12 inch ported subwoofer with output close to far bigger flagships, a strong used pick now that it is discontinued. The tradeoff: Ported design room interaction, 99.2 lbs (45 kg) size, and $2995 cost.

Buy the JTR Speakers Growler (2015) only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the JTR Speakers Orbit Shifter PRO instead.

Still deciding? The full Subwoofers rankings cover every ranked option.

BK Electronics Monolith-DF Discontinued

A down ported 12 inch subwoofer with balanced XLR and RCA inputs at a low price, now discontinued.

Driver: 12"Enclosure: PortedOutput 40-80 Hz: 108.4 dBWeight: 103.2 lbs
eBay
£406.95
JTR Speakers Growler (2015) PassiveDiscontinued

A 12 inch ported subwoofer with output close to far bigger flagships, a strong used pick now that it is discontinued.

Driver: 12"Enclosure: PortedOutput 40-80 Hz: 130.2 dBWeight: 100.1 lbs
eBay
$2,995

Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side

BK Electronics Monolith-DF JTR Speakers Growler (2015)
Price£406.95 Discontinued$2,995 Passive, Discontinued
Ranked#141 of 143 in Large Home Subwoofers (Over 75 lbs)#13 of 143 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, bottomported, front
Output SPL at 15 Hz91.3 dB-
Output SPL at 20 Hz102.0 dB92.8 dB
Output SPL at 25 Hz106.4 dB97.2 dB
Output SPL at 31.5 Hz108.3 dB106.6 dB
Output SPL at 40 Hz108.6 dB122.7 dB
Output SPL at 50 Hz108.7 dB130.0 dB
Output SPL at 63 Hz108.6 dB133.6 dB
Output SPL at 80 Hz107.7 dB134.4 dB
CEA-2010-A Average (40-80Hz)108.4 dB130.2 dB
Dimensions23.8”H x 21.3”W x 16.5”D (603.8 x 539.8 x 419.9 mm)22.5”H x 30”W x 20”D (571.5 x 762.0 x 508.0 mm)
Weight103.2 lbs (46.8 kg)100.1 lbs (45.4 kg)
Warranty25 years
Cabinet Colorblack, wood-
CountryUnited KingdomUnited States
Measurement SourceIlkka RissanenData-bass
Drivers12” (305mm) driver with ported design12” (305mm) driver
InputsXLR (balanced), RCA (unbalanced)-
XLR InputYes-
RCA InputYes-
TRS InputNo-
Optical InputNo-
Coaxial InputNo-
USB InputNo-
HDMI InputNo-
AES InputNo-
Aux InputNo-
Passive-Yes
Output SPL at 100 Hz-135.5 dB
Output SPL at 125 Hz-136.0 dB

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