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get the 2800
Yes
50 watts is a good amplifier size for use in the house. For other applications speakers usually have a power rating.
yes/no
In watt watt watts
No, 15 watt speakers are rated far to low to be used with an external amplifier.
A 5000 watt digital monobloc amplifier is good for competition cars. The ICBM Giant 5000 watt is a favorite right now.
Yes should be fine.
yes but the sound quality aint good enough :)
Yes it should be all right. Ratings for amp/speakers are approximate but as a rule it is preferable for the speaker to be rated higher than the amp.
It won't hurt to test your idea.
There is no listing on the Sound King website for that size amp. please contact the company for further information