I read somewhere it is 12 watts per channel RMS (80watts Peak)
Key to getting quality sound from low power head units is to use speakers that have a low RMS working range(5-50RMS- 100peak)
If you start with a speaker with a RMS range of 50-80 watts RMS you do not have enough watts to power the speaker properly and sound quality will suffer.
I can see why amps are needed now. Thank you.
-2012 Grabber Blue GT 6M Premium w/ Brembos, Glass Roof, HID security pkg, Rear Camera, 401a, FRPP GT500 Axle-backs, Front Pioneer TS-D6802R speakers, JHR bracket, Bondra clutch extension.
-1986 Mazda RX-7 GX - Fast Mirage 16" Wheels, Sumo Firenza 205/60R Tires, slotted brakes + performance pads. Otherwise factory stock.
-2008 Mazda Mazda3 GT Sport - Stock, 5MT.
-2004 Volvo XC90 T5 - Comfort pkg, safety pkg.
-1995 Infiniti G20 - Sold, Pioneer head unit, lighting mods, miss it dearly.