Subs for Hedlunds


Hi
I currently run one central REL Storm with my Hedlunds/AER Mk1s. For the WAF I can't position subs on view with Heds but think dual central subs is the way to go. (Unless you think otherwise:)))
A second (used) Storm would cost about £500 or $700. This is one alternative.
If I spend the £500 on DIY, (without SS amp) the other alternative is to DIY a pair of subs. I have space for a total internal volume of about 70 litres for each sub.
What specific drivers would be best - I haven't got to grips yet with all the calculations you guys make (though am keen to learn) but would obviously want to go as low as possible (20Hz?)
Will the sound quality significantly better twin REL storms.
Where do you get appropriate filters (I like the flexibility of the Storm)
Thanks, and for interest I am in the UK and cannot always get the parts you people talk about
Chris




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