Klipsch Flexus Sub 100 vs Polk Audio Monitor XT10

Short answer: the Klipsch Flexus Sub 100. It ranks #22 of 73 subwoofers by sound quality, rated 3.4/5, at $279.99; the Polk Audio Monitor XT10 ranks #52, rated 3.1/5, and costs $289, which makes this an easy call rather than a real tradeoff.

What the Klipsch Flexus Sub 100 does well: Independent CEA-2010 testing records 90.2 dB at 20 Hz and 109.1 dB (avg of 3/4 bands) through 40-80 Hz. The tradeoff: Only works with Klipsch Flexus soundbars, not as a standalone LFE sub.

What the Polk Audio Monitor XT10 does well: The budget subwoofer of Polk’s Monitor XT range, with a 10” woofer, a 50W (100W peak) amplifier and a compact 23 lbs (10.4 kg) cabinet. The catch: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from the measured Polk Audio PSW108, a similar 10” budget sub that reached 110.3dB in the 40 to 80Hz CEA-2010 bands.

Buy the Klipsch Flexus Sub 100. It is rated higher for sound quality than the Polk Audio Monitor XT10 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.

Worth knowing: the Polk Audio Monitor XT10 has not been measured yet. Its rating is estimated from related models, with a likely range of 2.7 to 3.4, so treat this verdict as provisional.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

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• Edifier T5s vs Klipsch Flexus Sub 100
• SVS SB-1000 PRO vs Klipsch Flexus Sub 100
• SVS 3000 Micro vs Klipsch Flexus Sub 100
• PreSonus Eris Sub 8BT vs Klipsch Flexus Sub 100
• Klipsch Flexus Sub 100 vs MartinLogan Dynamo 700w

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

Klipsch Flexus Sub 100: $279.99 Amazon eBay

Same family: the Klipsch Flexus Sub 200 (larger subwoofer, estimated 3.8/5).

Pros: Independent CEA-2010 testing records 90.2 dB at 20 Hz and 109.1 dB (avg of 3/4 bands) through 40-80 Hz. The sealed enclosure with a 10” driver suits a small room.

Cons: Only works with Klipsch Flexus soundbars, not as a standalone LFE sub. The 339.9H x 335.0W x 349.2D mm cabinet and 9.4 kg mass still need deliberate placement.

Full Klipsch Flexus Sub 100 review and specifications →

CEA-2010-A Average (40-80Hz)	109.1 dB (avg of 3/4 bands)
Country	United States
Dimensions	13.4”H x 13.2”W x 13.7”D (339.9 x 335.0 x 349.2 mm)
Drivers	10” (254mm) driver
Enclosure	sealed
Measurement Source	Brent Butterworth
Output SPL at 20 Hz	90.2 dB
Output SPL at 25 Hz	96.7 dB
Output SPL at 31.5 Hz	101.2 dB
Output SPL at 40 Hz	105.9 dB
Output SPL at 50 Hz	109.0 dB
Output SPL at 63 Hz	112.4 dB
Warranty	2/5
Weight	20.7 lbs (9.4 kg)

• Links
  • Official Klipsch Flexus Sub 100 Website
• Reviews, Comparisons and Sound Samples
  • Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
• Head-to-Head Comparisons
  • Klipsch Flexus Sub 100 vs MartinLogan Dynamo 700w
  • Klipsch Flexus Sub 100 vs PreSonus Eris Sub 8BT
  • Klipsch Flexus Sub 100 vs Klipsch HD Theater 600
  • Klipsch Flexus Sub 100 vs ELAC SUB1010
  • Klipsch Flexus Sub 100 vs Monitor Audio BRW10
  • Klipsch Flexus Sub 100 vs SVS 3000 Micro
  • Klipsch Flexus Sub 100 vs SVS SB-1000 PRO
  • Klipsch Flexus Sub 100 vs Edifier T5s
  • See all 13 comparisons

Polk Audio Monitor XT10: $289.00 Estimated Amazon eBay

Same family: the Polk Audio XT15 (smaller bookshelf, rated 3.7/5), the Polk Monitor XT20 (larger bookshelf, rated 3.4/5), the Polk Audio XT60 (smaller floorstanding, rated 3.5/5), the Polk Audio XT70 (larger floorstanding, rated 3.6/5), the Polk Audio XT30 (smaller center, rated 3.6/5), the Polk Audio XT35 (larger center, rated 4.1/5) and the Polk Audio Monitor XT12 (larger subwoofer, estimated 3.3/5). See every Polk Monitor generation.

Pros: The budget subwoofer of Polk’s Monitor XT range, with a 10” woofer, a 50W (100W peak) amplifier and a compact 23 lb cabinet. Polk rates it 24 to 160Hz, and it matches the measured Monitor XT speakers.

Cons: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from the measured Polk Audio PSW108, a similar 10” budget sub that reached 110.3dB in the 40 to 80Hz CEA-2010 bands. A 50W amplifier limits output in all but small rooms.

Full Polk Audio Monitor XT10 review and specifications →

Released	Nov 2022 (3 years ago)
Amplifier Power	50W RMS (100W peak)
Country	United States
Dimensions	15.7”H x 11.9”W x 16.6”D (399 x 302 x 422 mm)
Drivers	10” woofer
Enclosure	ported
Frequency Response	24-160Hz ±3dB (manufacturer specified)
Warranty	5/3
Weight	22.9 lbs (10.4 kg)

• 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
  • Polk Audio Monitor XT10 vs Yamaha NS-SW100
  • Polk Audio Monitor XT10 vs Sony Bravia Theater Sub 7