Fi audio SP4 Plus 18 inch subwoofer
Product details
| Management number | 1473569 | Release Date | 2025/07/08 | List Price | $520.00 | Model Number | 1473569 | ||
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18 inch Fi audio SP4 Plus subwoofer. Fresh recone from Fi audio (400 look it up) . Fi no longer makes these subwoofers but they are monsters . 3,500 watts rms (definitely under rated ) Great SPL or SQ subwoofer. Built for ported , 4th order or 6th order boxes . Not even broken in yet . Put a little power to it to make sure everything is working well . Had it in a 7 cubic foot box and it got down .
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