Alumapro Alchemy RX 12 SPL 12-Inch Metal Cone Subwoofer
Alumapro Alchemy RX 12 SPL 12-Inch Metal Cone Subwoofer
The Alchemy RX 12 SPL is the RX built for output. A quad-laminated Nomex suspension and thick Santoprene surround keep Alumapro's proprietary FEA-designed alloy cone under control at full power in a ported box, backed by an actively cooled motor with a copper shorting ring and 500 W RMS of power handling.
Highlights
- Optimized for vented (ported) SPL applications
- Proprietary FEA-designed alloy cone
- Active motor cooling system with copper eddy-current shorting ring
- Quad laminated Nomex suspension with thick Santoprene surround
- High-power silicone tinsel leads
- Proprietary cast frame
- 15 mm Xmax
- 500 W RMS / 1,000 W peak
Which Alchemy RX is right for you?
All three RX 12 models share the same proprietary FEA-designed alloy cone, motor, proprietary cast frame, 15 mm Xmax, mounting size and 500 W RMS / 1,000 W rating, and they look the same from the outside. The difference is in the suspension and tuning, which decides the box each one is built for.
| RX 12 | RX 12 SPL | RX 12 SQ | |
|---|---|---|---|
| Built for | Sealed | Ported, maximum output | Sealed, sound quality |
| Recommended box | Sealed 1.0–1.2 ft³ | Ported 2–3 ft³, tuned 32–38 Hz | Sealed 1.0–1.4 ft³ |
| Suspension | Dual laminated Nomex spiders | Quad laminated Nomex | Laminated Nomex |
| Surround | Extended-excursion Santoprene | Thick Santoprene | High-roll Santoprene |
| Fs (single 4 ohm) | 26 Hz | 35 Hz | 30 Hz |
| Vas (single 4 ohm) | 3.13 ft³ | 1.5 ft³ | 2.4 ft³ |
Not sure which fits your build? Contact us with your vehicle and box plans.
Specifications
| Parameter | Single 4 Ohm | Dual 4 Ohm |
|---|---|---|
| Fs (Hz) | 35 | 37 |
| Qms | 6 | 6 |
| Qes | 0.54 | 0.59 |
| Qts | 0.49 | 0.54 |
| Vas (Ft³) | 1.5 | 1.5 |
| Re (Ohms) | 4.1 | 1.93 (Par) / 7.72 (Ser) |
| Xmax (mm) | 15 | 15 |
Mounting dimensions (inches)
| Outside diameter | 12-9/16" |
|---|---|
| Mounting hole (cutout) | 11-5/16" |
| Bolt circle diameter | 12-5/16" |
| Mounting depth | 6-1/2" |
Recommended enclosures
- Ported: 2–3 ft³ nominal, tuned 32–38 Hz (factory in-car results measured at 2 ft³ tuned to 34 Hz)
The Alumapro difference
Alumapro has built aluminum-cone subwoofers in the USA since 1994. An aluminum alloy cone stays rigid under power where paper and poly cones flex, and it helps draw heat away from the voice coil, so bass stays tight and controlled when you turn it up. Every Alumapro sub is hand built in Huntley, Illinois.
Buy direct from ShopAlumapro.com, the main online home of Alumapro. Every order comes with the 2-year warranty, free shipping on orders of $499 or more, and real support from our team in Cary, Illinois. Questions about your build? Talk to us.
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