The 40di is rated at 20w x 2 into 4 ohms, 4ow x 2 into 2 ohms, 80w bridged mono into 4 4 ohms. It should bench at close to double that. It's very small, 5" x 8.75" x 2".
Or, I have another small amp. Alpine 3525. Old school, made in Japan, various scrapes and chips in the paint, needs a power plug (6 pin Molex) or hard wire it.
From Ampguts:
2 x 60W @ 4 ohms (20Hz ∼ 20kHz, 0.04% THD)
2 x 80W @ 2 ohms (1KHz, 1% THD)
1 x 160W @ 4 ohms bridged (1KHz, 1% THD)
1 x 200W @ 4 ohms bridged (1KHz, 10% THD)
Freq. Response: 10Hz ∼ 50kHz (+0/-1dB)
Fuse: 30A
Dimensions: 10.1" x 6.3cm x 2.1" (25.6cm x 16cm x 5.3cm)
Weight: 4.85 lb. (2.2 kg.)