Nick Asked: 4 Channel Amplifier Wiring – DIY PVC Boombox?

I am planning on making an outdoor weatherproof PVC pipe boombox. Here is my parts list so far:

Amplifier:
http://www.amazon.com/gp/product/B003K154IE/ref=ox_sc_act_title_2?ie=UTF8&m=ATVPDKIKX0DER

Power Source:

Option 1)
http://www.amazon.com/Volt-Alarm-Battery-12v5ah-Hour/dp/B0010Z4MDK/ref=sr_1_5?ie=UTF8&qid=1339377895&sr=8-5

Option 2)
http://www.ebay.com/itm/Ballistic-EV02-12V-LifePO4-Motorcycle-Battery-4-Cell-Small-LI-ION-21130257-/221030196453?hash=item33766d24e5&item=221030196453&pt=Motors_ATV_Parts_Accessories&vxp=mtr

Speakers:

Option 1) Four 4 inch two-way speakers (1 speaker per channel):
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330577468561#ht_1420wt_986

Option 2) Only two of the 4 inch two-way speakers from option 1 (ch.1&2) along with two 8 inch marine subwoofers (ch.3&4):
http://www.ebay.com/itm/1-PLMRW8-8-400-Watt-Subs-Bass-Marine-Boat-Yacht-White-Sub-Waterproof-Subwoofer-/400299964876?hash=item5d33bcb9cc&item=400299964876&pt=Car_Audio_Video&vxp=mtr#ht_3379wt_986

I am not 100% certain on the exact design yet but it will be simliar to the other DIY PVC ghettoblasters that are out there. My main concerns are around my wiring and circuitry. I can not say I have had any hands on experience with assembling audio systems. That being said, I am not completely new to all of this (I have had systems in my past two vehicles, both of which I spent upwards of $3,500 on..). My question is can I safely wire my option 2 setup? I do not believe that you can bridge the channels on this particular amplifier. Another question, how is my battery setup looking? What option would you guys choose? I do not plan to use a head unit since the amplifier can connect directly to an iPod/Auxiliary cable. I am adding a bluetooth auxiliary receiver unit for wireless control as well. Any other advice and/or criticism would be greatly appreciated.

Thanks

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