I've picked up a pair of secondhand Sanyo micro hi-fi speakers (rated 6W, 4 ohms impedance) and I'm looking to build a simple bluetooth audio set-up using a preassembled bluetooth digital amplifier (link).
The amplifier board runs from a 5V micro USB power source and, according to the specifications, expects 2x3W speakers at 4-8 ohms.
As there is a mismatched power, I'm trying to work out what would happen if I just connected them as is. Would there be:
1) The speakers will only output a low volume
2) The speakers will go to full volume, but the sound will be very distorted.
3) Something else??
Based on research, I think that option 1 would be the outcome – am I right? If so, the volume produced may in fact be ok – the speaker will be needed for a 4m x 5m room for occasional use at modest volumes. Is this realistic?
Happy to receive any other suggestions for an alternative amplifier board, or if it could be easily modified.