01 · Le PetitOctober 2026
The finished Le Petit pair in OSB
01 · after Jean Hiraga, 1983

Le Petit

One sheet of OSB, a drain pipe and garden fleece — flat within ±1 dB from 55 to 150 Hz.

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

Precision · measuredCharacter · heard
Foundationwhat it's built from

±1 dBbass, 55–150 Hz, room-free

47 Hz−3 dB extension

27.0 linside, 530 × 340 × 232 mm box

Oriented strand board: the inside of the box01DIY storeOriented strand boardOne 2000 × 1000 mm board, 22 mm, for the pair.
The HT DN75 drain pipe used as the port tube02Plumbing aisleHT DN75 drain pipeCut to length, it becomes the port tube.
Sheep's wool garden fleece and the fill pocket on the back panel03Garden centreSheep's wool fleeceSold as a mulch mat; one sheet per speaker.
Way of workinghow it was tuned
FIG 1 · Bass, driver + port, room-free, left speaker
Bass before and after: the untreated box has a +8.1 dB hump at about 75 Hz; the finished speaker is flat within ±1 dB from 55 to 150 Hz, −3 dB at 47 Hz

— Untreated— After

Port tuning Fb74.4 Hz≈ 48 Hz

Bass hump at ~75 Hz+8.1 dBgone

Box resonance, 350 Hz+13 dB−6.3 dB

“Not a huge bass addition, but the speaker sounds more balanced in some way.”

Listening note after step 2, the port tube. Measurement makes it verifiable, the ears make it final.

rich1704 · Documentation CC BY-SA 4.0 · Le Petit designed by Jean Hiraga, L'Audiophile no. 29, 1983Also: 02 · Le Petit Sub →