Hi MFL,
There is an outdoor wireless speaker system that JimBo told me about last year that might solve your problem. Here is the link:
http://www.brookstone.com/store/product.asp?product_code=497362&search_type=search&search_words=outdoor%20speaker&prodtemp=t2&cm_re=Result*R1C1*T
Weather-Resistant Indoor/ Outdoor Wireless Speaker
Brookstone sku # 497362Product Rating
(243 Ratings)
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Unleash your tunes with a wireless speaker system!
Our weather-resistant, wireless outdoor speaker lets you enjoy rich omnidirectional sound throughout your house or yard. With a 150-foot broadcast range, this powerful wireless speaker system transmits through walls, floors, and ceilings without the hassle of running wires. Order your wireless speaker system today and start your patio party on the perfect note!
Weather-resistant wireless outdoor speakers are perfect for pool parties!
Simply attach the transmitter to your stereo system and start enjoying music anywhere. You can also use it with portable MP3 players. And because all the controls are conveniently located on the speaker, you won’t have to run back and forth—inside and out—to adjust volume.
One of the most innovative wireless outdoor speakers on the market.
Powerful 900MHz technology ensures your signal gets through.
No tuning ever! Phase Lock Loop circuitry automatically keeps a clear audio signal.
Three audio channels prevent interference with other cordless devices.
Blue lighting illuminates the wireless outdoor speaker for extra ambiance at night.
5" woofer and 1" tweeter.
AC adapters included. Also runs on eight (8) D batteries (not included).