What the amp will produce is based on the load it "sees" at it's outputs. Your speakers, their impedance, and their efficiency dictate what you will get out of an amp, and what the effective loudness will be.Originally Posted by Boomer35
You wouldn't "split" the outputs of the two channel amp. You would combine the speaker leads using either the parallel (both hots together and both grounds together creating a 2 ohm load in the process ) or series (route from the output to one pole of a speaker, through that speaker, over to the other speaker, and then back to the other output on the amp like a loop, maintaining the 4 ohm load.)
When you parallel a pair of speakers you double the impedance, which halves your ohm load rating. (8 becomes 4, 4 becomes 2)
When you bridge, you turn the unit into a single channel "push-pull" amp and you further increase the resistance and drop the Ohm rating.
You need two bridged stereo amps for stereo, because they each become a mono amp in the process of bridging.
back to the answer to your question.
Your amp will work. It will be loud enough if your speakers have an efficiency of say... 89 dB or above.
It takes double the amp power to create 3 additional dBs of sound. So... 1 watt 1 meter 1 k= 89dB becomes 2 watts 1 meter 1 k 91dB
4 watts 94 dB
8 watts 97
16 watts 100
32 watts 103
64 watts 106