Monoprice Monolith 15 THX Ultra vs Klipsch RP-1600SW

Last updated: September 29, 2026

Short answer: the Klipsch RP-1600SW, if you are buying new. The Monoprice Monolith 15 THX Ultra measures as well as it (#59 vs #60 of 109 subwoofers, 4.2/5 vs 4.2/5) but is discontinued, so only consider it used; the Klipsch RP-1600SW is still sold new at $1,999.99.

Monoprice Monolith 15 THX Ultra vs Klipsch RP-1600SW

The case for the Monoprice Monolith 15 THX Ultra: Independent CEA-2010 testing records 110.0 dB at 20 Hz and 120.5 dB through 40-80 Hz. The catch: The 680.7H x 449.6W x 701.0D mm cabinet and 58.3 kg mass make this a serious placement and moving commitment.

The case for the Klipsch RP-1600SW: Independent CEA-2010 testing records 112.5 dB at 20 Hz and 120.4 dB through 40-80 Hz. Watch for: The 594.1H x 596.9W x 694.7D mm cabinet and 50.3 kg mass make this a serious placement and moving commitment.

Buy the Klipsch RP-1600SW, since the Monoprice Monolith 15 THX Ultra is discontinued and only worth hunting down used.

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

Buy the Klipsch RP-1600SW at B&H Photo Video ($1,999.99) →

Specifications Side By Side

Monoprice Monolith 15 THX Ultra Klipsch RP-1600SW
Price$1999 Discontinued$1,999.99
Ranked#59 of 109 in Large Home Subwoofers (Over 75 lbs)#60 of 109 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, front
Output SPL at 12.5 Hz90.0 dB101.0 dB
Output SPL at 15 Hz100.8 dB108.5 dB
Output SPL at 20 Hz110.0 dB112.5 dB
Output SPL at 25 Hz115.6 dB116.3 dB
Output SPL at 31.5 Hz118.0 dB120.5 dB
Output SPL at 40 Hz122.0 dB121.5 dB
Output SPL at 50 Hz121.0 dB120.6 dB
Output SPL at 63 Hz120.0 dB120.0 dB
Output SPL at 80 Hz119.0 dB119.6 dB
Output SPL at 100 Hz119.0 dB118.8 dB
Output SPL at 125 Hz118.0 dB118.5 dB
CEA-2010-A Average (40-80Hz)120.5 dB120.4 dB
Dimensions26.8”H x 17.7”W x 27.6”D (680.7 x 449.6 x 701.0 mm)23.4”H x 23.5”W x 27.4”D (594.1 x 596.9 x 694.7 mm)
Weight128.5 lbs (58.3 kg)110.9 lbs (50.3 kg)
Warranty55
Cabinet Colorblackblack
CountryUnited StatesUnited States
Measurement SourceErinsAudioCornerAudioholics
Drivers15” (381mm) driver16” (406mm) driver
InputsXLR, RCA-
XLR InputYes-
RCA InputYes-
TRS InputNo-
Optical InputNo-
Coaxial InputNo-
USB InputNo-
HDMI InputNo-
AES InputNo-
Aux InputNo-
Output SPL at 10 Hz-85.2 dB
Buy the Klipsch RP-1600SW at B&H Photo Video ($1,999.99) →

How Monoprice Monolith 15 THX Ultra compares with other leading options:

Prices on this page were last checked September 29, 2026 at 3:43 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

Monoprice Monolith 15 THX Ultra: $1999 Discontinued eBay

Monoprice Monolith 15 THX Ultra ranking card

Newer model: the Monoprice Monolith M-15 V2, ranked lower, rated 4.2/5 (also discontinued).

Pros: Independent CEA-2010 testing records 110.0 dB at 20 Hz and 120.5 dB through 40-80 Hz. The ported, front enclosure with 15” (381mm) driver has the headroom for demanding film bass in a large room.

Cons: The 680.7H x 449.6W x 701.0D mm cabinet and 58.3 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential. Discontinued.

Notes: Product # 24458

Full Monoprice Monolith 15 THX Ultra review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)120.5 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions26.8”H x 17.7”W x 27.6”D (680.7 x 449.6 x 701.0 mm)
Drivers15” (381mm) driver
Enclosureported, front
HDMI InputNo
InputsXLR, RCA
Measurement SourceErinsAudioCorner
Optical InputNo
Output SPL at 12.5 Hz90.0 dB
Output SPL at 15 Hz100.8 dB
Output SPL at 20 Hz110.0 dB
Output SPL at 25 Hz115.6 dB
Output SPL at 31.5 Hz118.0 dB
Output SPL at 40 Hz122.0 dB
Output SPL at 50 Hz121.0 dB
Output SPL at 63 Hz120.0 dB
Output SPL at 80 Hz119.0 dB
Output SPL at 100 Hz119.0 dB
Output SPL at 125 Hz118.0 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight128.5 lbs (58.3 kg)
XLR InputYes
Search eBay for Monoprice Monolith 15 THX Ultra →

Klipsch RP-1600SW: $1,999.99 B&H Photo Video eBay

Klipsch RP-1600SW ranking card

Pros: Independent CEA-2010 testing records 112.5 dB at 20 Hz and 120.4 dB through 40-80 Hz. The ported, front enclosure with 16” (406mm) driver has the headroom for demanding film bass in a large room.

Cons: The 594.1H x 596.9W x 694.7D mm cabinet and 50.3 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Full Klipsch RP-1600SW review and specifications →

CEA-2010-A Average (40-80Hz)120.4 dB
Cabinet Colorblack
CountryUnited States
Dimensions23.4”H x 23.5”W x 27.4”D (594.1 x 596.9 x 694.7 mm)
Drivers16” (406mm) driver
Enclosureported, front
Measurement SourceAudioholics
Output SPL at 10 Hz85.2 dB
Output SPL at 12.5 Hz101.0 dB
Output SPL at 15 Hz108.5 dB
Output SPL at 20 Hz112.5 dB
Output SPL at 25 Hz116.3 dB
Output SPL at 31.5 Hz120.5 dB
Output SPL at 40 Hz121.5 dB
Output SPL at 50 Hz120.6 dB
Output SPL at 63 Hz120.0 dB
Output SPL at 80 Hz119.6 dB
Output SPL at 100 Hz118.8 dB
Output SPL at 125 Hz118.5 dB
Warranty5
Weight110.9 lbs (50.3 kg)
Check current price at B&H Photo Video ($1,999.99) →Search eBay for Klipsch RP-1600SW →