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Alpine Type R's

Old 09-26-2006, 12:05 AM
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Alpine Type R's

Couple quick questions.. 1) What does everything think about the type of boxes these subs run best in. Slot or ported? I know there are other threads on this, I just have not got a clear picture of which one sounds better. 2) I have a 1200 watt amp, is this able to run a 500 watt rms sub like the Type R? Is there any problem with this? I am confused about the 2 ohm, 4 ohm thing. Can someone spell that out for me. 3) When looking for a box..how do you calculate the box volume (in cubic ft.) ?? Thanks for your time!
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Old 09-26-2006, 12:34 AM
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1.) def. ported
2.) 1200 will run it PERFECT!
3.) add me on MSN, ill tell you everything you need to know, or come for a over here in abby, and i'll be glad to help you out.
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Old 09-26-2006, 01:21 AM
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How is 1200 watts of power the perfect amount for a maximum 500w rms sub? Heat is the #1 killer of subs, before you pronounce something as being a perfect match, you might want to educate the person you are giving this information to as to the potential damage that will occur to his speaker given this much power and played on a continous basis.

Always list the model #'s of the equipment that you have so that a accurate picture can be drawn. For example, your 1200 watt amp might be a Audiobum special that says 1200 watts on the front but in reality is 200w rms and only stable to 4 ohm.

A proper sub can be chosen once we know the amplifier that you have. Do you already have the Alpine or are there other options on the table? Is the goal a louder than average system or a good tonally balanced system?

A slot is a port, thus they are one of the same. There are different types of ports, a slot port, a round port, a aeroport and for the most part they all do the same thing. All are referred to as a ported enclosure. As far as the box calculation goes, it is simple math. Back to school and remembering basic math. Volume of a square or rectangle is L x W x H.

12" x 12" x 12" = 1728 cubic inches = 1 cubic foot.

This is your constant. Any combination of numbers L x W x H = 1728 is what you are after. If you know the gross volume that you need, say 1.5 cubic feet, the equation will be as follows.

L x W x H = 2592 cu.in. = 1.5 cu.ft.

Here is a link to the volume calculators that will make life a little easier for you and allow you to factor in the added width of materials as well. It will also allow you to calculate with ease other types of boxes like wedges.

http://www.the12volt.com/caraudio/boxcalcs.asp

Last edited by MR2NR; 09-26-2006 at 01:29 AM.
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Old 09-26-2006, 02:42 PM
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^^like he said! I have 2-12" typr r's in a sealed box to Alpine specs that I'm more impressed with as time goes on. All things considered, I still like ported over sealed, but I'm really enjoying this sealed combination I currently have. Excellent subs by the way, very clean, tight, and can get stupid loud. I have 1200 watts going to 2-12" r's, which seem like a good match. I think 1200 rms to 1 type r is too much. After 500 watts, the max rms limit of the sub, the rest of that power is dissipated as heat in the voice coils.
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Old 09-26-2006, 04:01 PM
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Ya like Rob said. Without model numbers its a hard guess. We need to figure out if thats 1200W rms or Max power.
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