PowerBass XL-1240TD — 12″ Shallow DVC Sub, 400W

When you want the full cone area and low-end authority of a 12″ subwoofer but need the wiring freedom to match any amplifier, the PowerBass XL-1240TD is the answer. At Safe and Sound, it’s the dual voice coil shallow mount subwoofer we reach for when a customer wants serious bass in a tight space and the flexibility to configure their system exactly as they want it. With 400W RMS, a 3.8″ mounting depth, and dual 4-ohm coils that wire to 2Ω or 8Ω, the XL-1240TD gives you 12″ performance and amplifier compatibility in a package that fits where full-depth drivers simply cannot.

Why choose the PowerBass XL-1240TD?

The XL-1240TD takes everything that makes the XL-1240T one of the best shallow subwoofers in its class — the 140 oz motor, the flat injection-moulded cone, the composite Poly/Glass Fibre basket — and adds a second 4-ohm voice coil. That single addition transforms how the driver integrates with an amplifier. Instead of being locked to a fixed 4-ohm load, you choose: wire in parallel for a 2Ω load and extract maximum wattage from a high-current mono amp, or wire in series at 8Ω if your amplifier is bridged and prefers a more stable impedance. It’s the same outstanding shallow 12″ subwoofer, with options.

• Dual 4-ohm voice coils, two wiring options — parallel wiring gives a 2Ω load for maximum amplifier output; series wiring gives an 8Ω load for bridged channels and high-impedance amplifiers. One driver, genuine flexibility.
• Real 12″ bass in 3.8″ of depth — a larger cone area than any 10″ driver, reaching down to 33Hz, in a mounting depth that opens doors to under-seat enclosures, custom load floors, and van conversions.
• 140 oz motor for tight, controlled bass — the larger inverted ferrite magnet keeps the cone accurately controlled at high excursion, so bass stays defined even when you push the volume.
• Flat cone for a flat response — the proprietary single-piece injection-moulded polypropylene cone minimises colouration, producing natural, detailed low-end rather than one-note boom.
• Composite basket, no colouration — the non-resonant Poly/Glass Fibre turbine-style basket stays quiet under load, keeping the sound clean across the full volume range.

Dual voice coil — what it means for your installation

Choosing a DVC subwoofer is about more than wiring diagrams — it’s about giving yourself room to build the best possible system now and adapt it later. If you upgrade your amplifier down the line, the XL-1240TD’s dual coils mean you’re likely to stay compatible without changing the subwoofer. You can also run each coil from a separate amplifier channel, allowing a stereo-summed bass signal, or bridge two channels for more power into a single coil while keeping the other in reserve.

Not sure how to wire the XL-1240TD into your specific amplifier? The Safe and Sound team is happy to check your amp’s specifications and recommend the right configuration before you order. And if you’d rather have us handle the complete installation — enclosure build, wiring, and final tuning — our workshop does this regularly and can have your vehicle sounding right from the first play.

Key specifications

Specification	Detail
Size	12″ shallow mount subwoofer
Voice coil configuration	Dual 4-ohm (DVC)
Wiring options	2Ω (parallel) or 8Ω (series)
Power handling	400W RMS / 800W Max
Mounting depth	3.8″ (97mm)
Cutout diameter	11″ (281mm)
Sensitivity	84 dB (1W/1M)
Frequency response	33Hz – 450Hz
Resonant frequency (Fs)	33Hz
Voice coil	2″ vented KSV voice coil former (dual)
Xmax	7.5mm
Cone material	Proprietary single-piece injection-moulded flat polypropylene
Basket	Proprietary composite Poly/Glass Fibre, non-resonant turbine style
Magnet	Inverted ferrite, 140 oz
BL (force factor)	17.568 Tm
Qts	0.526
Terminals	Chrome push terminals
Recommended enclosure	Small sealed

XL-1240TD vs XL-1240T — which one do you need?

Both drivers share the same 12″ shallow mount basket, flat cone, 140 oz magnet, mounting depth, and power rating. The only difference is in the voice coil — and that difference matters when it comes to pairing with an amplifier:

Model	Voice Coil	Wiring Options	Best for
XL-1240T	Single 4-ohm	4Ω only	Straightforward installs; amp rated at 4Ω
XL-1240TD	Dual 4-ohm	2Ω or 8Ω	Maximum flexibility; bridged amps, high-current mono amps

Not sure which suits your amplifier? The Safe and Sound team is happy to check your amp’s impedance rating and advise the right wiring configuration before you order.

What’s in the box

• PowerBass XL-1240TD 12″ dual voice coil shallow mount subwoofer (single unit)
• Mounting hardware

Note: an enclosure and amplifier are required and sold separately. The XL-1240TD is optimally designed for a small sealed enclosure.