I need two 15" in the same reflexcab.

Hey guys..

I'm looking to expand my portable soundsystem. picture: goo.gl/18qsKe

I need two 15" PA units, that goes well in the same cabinet.
The width of the cab must not exceed 60cm..

Highest possible sensivity ( around 97db-100db)
Lowest freq. about 40hz +/-

Price around 200€ pr. unit. (Or what you see reasonable)

I don't want to make two seperate cabinets, as it is going to fit a "Christiania box bike".. So weight and size is an issue.

Which units will you prefer? And should I put them in series or parallel? I have an Precision Devices P900.5 5 channel class d amplifier, if you need that information

I hope you can help me out!

Rasmus