If a speaker wiring run to outdoor speakers is available for your AVR, then IMHO Sonos becomes a good option. Set-up is straightforward:
You need a Sonos bridge (app 4" x 4" x 2" box) wired to your router. Run the Sonos set-up software to point the Sonos system to your music library. Plug a Sonos Connect (app 4" x 7" x 7" box) into your AVR as a new source. Select the Sonos Connect as your source for zone 2. Hard wire the outdoor speakers of your choice to the zone 2 output of your AVR. Control your music library via Sonos app on your iPad. You'll also get access to (and control over) Pandora, MOG, etc from the Sonos app on your iPad.
As a bonus, you get wireless access to your library anywhere you want by adding additional Sonos Zones (they make powered units both with, and without, integrated speakers) . Also, you'll have access on Zone 1 of your AVR (if you don't already have it there).
The Sonos hardware is +/- $450 and outdoor speakers are available at all price levels, so there's a fair bit of price flexibility in this approach, too.
Good luck.
Marty
You need a Sonos bridge (app 4" x 4" x 2" box) wired to your router. Run the Sonos set-up software to point the Sonos system to your music library. Plug a Sonos Connect (app 4" x 7" x 7" box) into your AVR as a new source. Select the Sonos Connect as your source for zone 2. Hard wire the outdoor speakers of your choice to the zone 2 output of your AVR. Control your music library via Sonos app on your iPad. You'll also get access to (and control over) Pandora, MOG, etc from the Sonos app on your iPad.
As a bonus, you get wireless access to your library anywhere you want by adding additional Sonos Zones (they make powered units both with, and without, integrated speakers) . Also, you'll have access on Zone 1 of your AVR (if you don't already have it there).
The Sonos hardware is +/- $450 and outdoor speakers are available at all price levels, so there's a fair bit of price flexibility in this approach, too.
Good luck.
Marty