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FBT X-SUB 18SA 18
FBT X-SUB 18SA 18
FBT X-SUB 18SA 18
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FBT X-SUB 18SA 18" Active Subwoofer

Marsoni M251S
Sale price$599.50
Pay 4 payments of $149.88 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
FBT X-SUB 18SA 18" Active SubwooferDesigned as the perfect partner for the X LITE and X PRO series, FBT introduces the new X SUB 18SA powered subwoofer. Loaded with a single 18 heavy duty woofer, the X SUB 18SA is controlled by a 1200W Class D amplifier with DSP at 4 presets allowing perfect tailoring of the extended low frequency to the mid high. The rugged plywood enclosure is built to withstand touring conditions, yet crafted with Italian style to suit the most elegant fixed
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Your FBT X-SUB 18SA 18" Active Subwoofer orders ship within 1-2 business days.

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  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 399 reviews
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Product Reviews
K
Verified Purchase
Kaleigh Pipho
Boise, US
★★★★★ 5
Good but
Size: 40-50 HP
Bought and installed about a year ago. Fit exactly right and still holding up. Would buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
M
Verified Purchase
mike james
Los Angeles, US
★★★★★ 5
Oem quality, great kit
Size: 35-60 HP
Oem quality kit , got me back on the water,diy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
S
Verified Purchase
Scottytoohotty
Battle Creek, US
★★★★★ 1
DO NOT BUY THIS GARBAGE
Size: 20-35 HP
DO NOT BUY. Stopped working after 2nd trip total of 2 hours use. Not returnable after 30 days. Could easily ruin your engine. Expensive garbage.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026
T
Verified Purchase
Thomas W.
Belleville, US
★★★★★ 5
Looks very good quality to me.
Size: 85-300 HP
Everything looks good quality to me. I find it odd that the people leaving bad reviews with pictures of broken and melted impeller, when you can clearly see the brass on the inside is brown and dirty like old pennies and mine is shiny new. It's almost like the took the pictures of the ones they replaced to get a refund and a free repair kit.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
K
Verified Purchase
Kris W Cayton
Belleville, US
★★★★★ 5
Great quality and price
Perfect fit. Received quicker than boat shop
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 22, 2025

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