SP 12CX Subwoofer 12" 2500W RMS 2+2 Ohm
Free shipping worldwide. Pay in easy, interest-free installments with Klarna.
SUPER POWER AUDIODESIGNED IN ITALY
MMXXVI
2500 watt RMS.
65.5 mm voice coil.
A 12"/30 cm subwoofer built around a 65.5 mm (2.5") dual voice coil: 2+2 ohm, 2500 W RMS continuous, 5000 W peak, 87.5 dB sensitivity. Compressed paper and fibreglass cone, large “R” suspension, 220 °C aluminium winding. Sold per unit.
Power, measured not promised
RMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 2500 W RMS
Why this subwoofer
Not a burst figure: 2500 W RMS is the power the voice coil handles continuously, with 5000 W of peak headroom on top.
The bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 220 °C aluminium wire.
Two coils: in parallel 1 ohm, in series 4 ohm. You choose the impedance that matches your amplifier instead of the other way round.
Compressed paper and fibreglass cone, large “R” suspension: it takes the excursion without losing shape.
Wiring of the two voice coils, impedance, mounting and full specifications.
⇩ Open the manual (PDF)PDF · English · 2026
What you get
- One SP 12CX subwoofer. The price is for a single unit: for a pair, order two.
- Amplifier, enclosure and cables are not included. You build the system around the subwoofer.
- Invoice from an Italian company, shipped from Italy with warranty on manufacturing defects.
- Free technical support before and after the purchase, from Italy.
Technical specifications
| SUBWOOFER — SPECIFICATIONS | |
|---|---|
| Nominal diameter | 300 mm (12") |
| Rated impedance | 2+2 ohm, dual voice coil |
| Rated power (RMS) | 2500 W |
| Peak power (MAX) | 5000 W |
| Sensitivity | 87.5 dB |
| Frequency range | 30–300 Hz |
| Voice coil diameter | 65.5 mm / 2.5" |
| Winding material | 220 °C aluminium wire |
| Suspension | Large “R” form |
| Cone | Compressed paper + fibreglass + black painting |
| Sold as | Single unit |
MANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS
Complete the system
Before you install it
- Decide the impedance before you wire it. The two 2 ohm coils in parallel give 1 ohm; in series they give 4 ohm. Check that your amplifier is stable at the impedance you choose.
- Match the amplifier to 2500 W RMS. Sizing on the 5000 W peak figure means overdriving the coil: use the RMS value.
- Build the enclosure rigid. A 12" cone moving this much air loads the box: thick panels, braced and sealed, or the box will lose output and rattle.
- Size the power cable for the amplifier, with an inline fuse close to the battery and a ground point on bare metal.
Questions installers ask
spaudio@spaudio.it · +39 340 807 8778
Accepted payment methods
Visa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna
SP Audio — Super Power Audio. Designed in Italy by Audiocar Import & Export SRLS, Milano, official SP Audio distributor for Europe.