tshaud87

can the polk mm1540 15" svc 425rms sub hold up perfect sq in a sealed box?

or is a ported box neccesary?

gramser57

iTrader: (1)

it would do both well since its qts is .5, it all depends on your goals and type of music you listen too.

tshaud87

well im going for all-around uncomprimising perfection .....accuracy is really important to me but i listen to alot of rap too and they say ported is better for rap and dance but i just dont get how dirty, late sound can ever be better for anything ...... so basically if i put this thing in the recommended sealed 1.5 cu. ft ...or maybe a slightly larger sealed box will it have trouble hitting long deep notes or stretches loudly and accurately? like what is the tradeoff here?.......also i plan on giving it 400rms will that be a problem in either setup?

gramser57

iTrader: (1)

Accuracy is your goal then go with a big sealed enclosure but you may be disappointed with the output especially with 400rms.

tshaud87

ok and if i go with slightly over 2.5 cu. ft slot ported what am i losing that way? ...how audibly off will it be?.............and u said disappointed? .....how so? (fyi this is just for in-car personal listening pleasure i know its not an insane amount of power) ...or are u saying that much power will affect the sound negatively in a sealed box?

also if i would go sealed what size are you talking when u say big?

tshaud87

also if it makes a difference i plan on having the crossover set somewhere between 125-150hz

gramser57

iTrader: (1)

To get a flat response in a ported enclosure the sub requires minimum 4 cubic feet in air space, it has a big VAS.
A well designed ported box is greatly efficient compared to sealed, 400 watts in a proper vented enclosure is enough to give you a nice flat response on low to medium listening volume and dash rattling, mirror shaking output when hammering it.

If you want sealed go with 2.5 cubic feet.