02 · Le Petit SubOctober 2026
3D model: the sub between a Le Petit pair
02 · companion to Le Petit

Le Petit Sub

Le Petit's bigger twin: two opposed 10″ drivers, built from one sheet of OSB.

Measure & Taste · There is no correct sound, only the endless, joyful search for yours. Principles of sound exploration →

Precision · calculatedCharacter · chosen
Foundationwhat it's built from

≈ 40 lnet, sealed and braced, 44.0 l gross

2 × 10″SB Acoustics SB26SFCL38-4, opposed

340 × 530Le Petit's front, 350 mm deep

≈ 18 kgOSB ≈ 12.5 kg, drivers 2 × 2.9 kg

3D model, see-through: tie strip, window brace and the wool below it013D modelWool in the lower half300–500 g loose, below the window brace.
3D model, exploded: full front and back plates, sides, top, bottom and braces023D modelGlued shutFull 340 × 530 plates front and back.
3D model, cut open: the tie strip between the two magnets033D modelBraced insideA tie strip between the magnets, a window brace below.
Way of workinghow it's designed
FIG 1 · Top section at driver height, to scale
Top section: two drivers in the side panels, magnets facing each other; both cones move out together, so the pushes on the box cancel

Both cones move out together, so the forces on the box cancel: it doesn't rock, buzz or walk.

Below 80 Hz you can't hear where bass comes from, so one sub between the pair is enough.

Le Petit stays Le Petit: its strength is the midrange and the coherence of one full-range driver. The sub only takes over the bottom octaves.

rich1704 · Documentation CC BY-SA 4.0 · companion to Le Petit, designed by Jean Hiraga, 1983Also: 01 · Le Petit →