i recently bought a 15" kicker sub an just want to know what box size i should make for an what port size/s. some1 has told me to make a 70L box using 2 110mm ports an about 80mm long... would this be aight for sq?

any help would be greatly appreciated

we need the relevant thiele-small specs to design a box: Fs (or F0), Qts, Vas

so either post them up or tell us more specifically what model sub you have.

Yeah, what Kicker 15 is it?

Generally Kicker 15s need more than 70 litres to port them, more appropriate for a 12 (L7).

Without looking serioiusly, that sounds like an SPL tune to me. Very short for that much port area in that size box = high tune = not SQ. Very.