The IDQ-10 is one of the most musical subs I've heard.
A 1.2ft ported box, tuned to 29Hz, with a subsonic filter at 25Hz is quite adequate for SQ/SPL.
A fairly delicate sub tho' as far as abuse goes, but delicate sounding.
Requires a good deal of mid-bass install technique, as it is truly an "ultra low frequency transducer"

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Charlie Lamble
Sault Ste Marie ON

I'm sure you think you understood what you heard me say, but I hope you realize that what I said is not what I meant