Monoprice Monolith 15 THX Ultra vs Klipsch RP-1600SW

Last updated: August 15, 2026

Short answer: the Monoprice Monolith 15 THX Ultra. It ranks #50 of 97 subwoofers by sound quality at $1999; the Klipsch RP-1600SW ranks #51 and costs $1999.99, so there is not much of a tradeoff to weigh.

What the Monoprice Monolith 15 THX Ultra offers: Its documented strengths make it a credible option in this class. Watch for: Its documented strengths make it a credible option in this class.

What the Klipsch RP-1600SW offers: Its documented strengths make it a credible option in this class. Watch for: Its documented strengths make it a credible option in this class.

Buy the Monoprice Monolith 15 THX Ultra. It ranks higher for sound quality than the Klipsch RP-1600SW and costs less, so there is no real case for the other one.

Buy the Klipsch RP-1600SW at Amazon ($1,999.99) →

Monoprice Monolith 15 THX Ultra vs Klipsch RP-1600SW

Specifications Side By Side

Monoprice Monolith 15 THX Ultra Klipsch RP-1600SW
Price$1999$1,999.99
Ranked#50 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#51 of 97 in Large Powered 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 kg110.9 lbs / 50.3 kg
Warranty55
Cabinet Colorblackblack
CountryUnited StatesUnited States
Measurement SourceErinsAudioCornerAudioholics
Drivers15" (381mm) driver16" (406mm) driver
Output SPL at 10 Hz-85.2 dB
Buy the Klipsch RP-1600SW at Amazon ($1,999.99) →

More useful head-to-heads from the same speaker class:

The Two Speakers In Full

Monoprice Monolith 15 THX Ultra: $1999

Monoprice Monolith 15 THX Ultra ranking card

Notes: Product # 24458

Full Monoprice Monolith 15 THX Ultra review and specifications →

CEA-2010-A Average (40-80Hz)120.5 dB
Cabinet Colorblack
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
Measurement SourceErinsAudioCorner
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
Warranty5
Weight128.5 lbs / 58.3 kg
Search eBay for Monoprice Monolith 15 THX Ultra →Search used audio listings for Monoprice Monolith 15 THX Ultra →

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Klipsch RP-1600SW: $1,999.99 Amazon

Klipsch RP-1600SW ranking card

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 Amazon ($1,999.99) →Search eBay for Klipsch RP-1600SW →Search used audio listings for Klipsch RP-1600SW →

As an eBay Partner, we may be compensated if you make a purchase.