Built to hit hard 

A long-throw cone and 800 watts move enough air to slam. 

The number that matters most on a sub like this is excursion — how far the cone can travel and stay controlled — and this one moves 15 mm each way. That’s a lot of air for a 10″, and paired with 800 watts of power handling it’s what lets the BA10D2 deliver bass you feel in your chest rather than just hear. It’s a driver built to be driven hard, and to take it. 

A serious motor 

A double-stacked motor gives it grip and power handling in equal measure. 

Behind the cone sits a double-stacked ferrite motor — two 50-ounce magnets, close to 2.8 kilograms of it — developing a 14.7 T·m force factor. That’s an unusually strong motor, and the strength does two jobs at once: it grips the heavy cone tightly, so the bass starts and stops with the signal rather than booming on after it, and it handles the current 800 watts throws at it. A weak motor makes a loose, one-note sub. This isn’t that. 

Long-throw, kept linear 

A tall coil and twin spiders keep the cone controlled through its full travel. 

Big excursion is only useful if the cone stays under control while it does it. We wound the voice coil tall — 40 mm — so it stays engaged in the magnetic gap right through that 15 mm of travel, and we used two spiders rather than one to keep the cone moving dead straight instead of rocking as it reaches the ends of its stroke. The result is excursion you can actually use: controlled and low in distortion at volume, not just a cone flapping. 

Wire it to any amp 

A dual 2-ohm voice coil matches whatever amplifier you run. 

Two 2-ohm coils give you a 1-ohm mono load in parallel, a 4-ohm mono load in series, or independent connection across two channels — so it suits just about any monoblock or bridged amp, with the high-current 1-ohm option there for the amplifiers built to exploit it. 

Big output from a manageable box 

A low Vas means it hits hard from a compact sealed enclosure. 

Its equivalent compliance volume (Vas) is only 13.6 litres, and its total Q suits a sealed box — which together mean you don’t need a huge cabinet to get the most from it. In a car, where every litre of boot volume is contested, a sub that delivers big output from a small sealed box is worth a lot. Build it a modest sealed enclosure and it performs; you don’t have to surrender half the boot to a giant ported box. 

The cone, and the build 

A stiff cone and a proper chassis stand up to the power. 

The cone is fibreglass cloth — stiff and light, so it holds its shape under the forces that 800 watts and 15 mm of travel put through it, rather than flexing and distorting. A foam surround gives the suspension the compliance for that long throw, the coil is wound on an aluminium former that carries heat away from the windings, and it all sits on a steel basket with an injection-moulded dust cap. It needs 161 mm of depth and a 230 mm cut-out — this is a full-size sub, and it wants a proper install to do its thing.