I'm a little stuck on box building for my new 12' Type R Dual 2 Ohm. I'm running a JBL 600.1 and I'm looking to build a ported box for it.

Alpine doesn't have any of their recommended specs for boxes on their website anymore.. so I'm wondering if anyone still remembers it. Crutchfield recommends a 1.25 cubic box with a 4 inch by 13 inch pipe vent. Does anyone what that'll tune to approximately? Also.. what's the recommended freq to tune one 12' Type R to?

Hey, help my friend out.. i went to buy this sub with him...

Type r dual 2 ohm version ... the manual only shows the recommendations for a sealed enclosure ..

looking for a ported sized box that will give a nice everyday driving sound!!

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I like a smaller box (1.5 ft^3 net volume) tuned low (25-30 Hz) with the Type-Rs ... (4" port, 22" long for 30 Hz, 4" port, 33" long for 25 Hz)

That being said, watch the gains ... That's a lot of power for a Type-R in a ported enclosure ... And I very highly recommend against bass tests under these conditions ...

[ July 07, 2003, 03:54 PM: Message edited by: Jmac ]

Stu Check out Crtuchfield for this sub they have the ported specs posted there I think, at least for my 15 they did.

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Tuning frequency would be approximately 41.1 Hz ...

crutchfield says their specs on the ported box came from alpine, so either trust them. Or pick up the phone and call up alpine. They'll tell ya the dillio.

i know my box's are like 1.2cu ft after port n sub with probably a 3x7" port or so...no idea what it's tuned to, but it sounds alright.

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