BP-12 | Alumapro 12 inch 400 watt Band Pass Enclosure

Maximum Bass in Minimum Space — Hand-Built in Huntley, IL

The BP-12 is the flagship of the BP-Series — a 12" bandpass enclosure that delivers chest-thumping, competition-level bass from a design that outperforms subwoofers rated at much higher power. Alumapro's dual chamber bandpass design reaches down to 20Hz with 97dB sensitivity, meaning this box gets loud — seriously loud — without demanding a massive amplifier. For enthusiasts who want maximum impact, the BP-12 is the real deal.

Dual Chamber Bandpass Design

The BP-12's precisely tuned dual chamber system harnesses both the front and rear energy of the 12" woofer simultaneously. This is the most efficient enclosure design in car audio — delivering higher SPL per watt than sealed, ported, or free-air setups. The frequency response is specifically shaped to complement car cabin acoustics, with deep, authoritative bass that extends to 20Hz and beyond.

Alumapro Aluminum Alloy Cone Woofer

Inside the BP-12 is a full-size 12" Alumapro woofer featuring the signature aluminum alloy cone — immune to temperature and humidity extremes that destroy paper and poly cones. The massive motor structure, rigid frame, Kevlar spider, and Santoprene surround handle sustained high-output punishment without breaking a sweat.

Aero-Port Technology

Large flared aero-ports eliminate compression and port noise that plague lesser enclosures. At competition-level output where cheap boxes fall apart, the BP-12 stays clean, tight, and composed. Zero port noise. Zero compression. Just bass.

Built to Last, Built to Impress

Premium durable black carpet, heavy-duty bolted and clamped construction, and a thick gasketed plexi viewing window with carbon-pattern accents. The BP-12 isn't just an enclosure — it's a statement. Show it off at the meet. It can take it.

Specs at a Glance

• Enclosure: Bandpass with 1x12" Alumapro woofer
• Frequency Response: 20–80 Hz
• Impedance: 4 or 8 ohms
• Sensitivity: 97dB / 2.83v / 1m
• Dimensions: 15.5"W x 16"H x 19.5"D

Engineered and assembled in the USA by Alumapro.