landscape powered speakers?

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I'm considering options for powering a small backyard 5.1 setup. The longest run is about 100ft from the source. The sats are based on the CHR-70 (4ohm, 22w max). I am not at all concerned about them being loud, as the neighbors are very close all around. Three options I'm considering: 1) small av receiver at the source (Sherwood r-904n pretty much only one that will fit at source) 2) external multichannel amplifier without much size constraint, and 3) powered speakers running line-level from preamp at source. Can anyone give me recommendations for or warnings about the 3rd option? Is there any chance using a spare 300w 12v landscape lighting transformer would provide anything close to good sound with a tripath/chipamp in each speaker? If not, what is a decent, reasonably priced power supply for the powered speaker approach? This will not be a heavily used system, and given the low power requirements of the speakers, would a SLA battery approach (recharged overnight on a timer) be a cheap/decent sounding approach? Just looking for a little inital guidance to get me going... budget is about $300 for amps and PS.
 
As much as I'd like to encourage diy, I'd opt for a small receiver at source.

If you want to save some dollars look for an older used Panasonic SA-XR receiver.

Care to elaborate why? I've read a number of reasons why what I'm thinking about may be difficult, but I'd like some of the more experienced people here to elaborate on their advice a bit (help me learn as I go!).
Thanks.

P.S. unfortunately, the panasonic receiver is too deep.
 
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