I was looking to build a box for my brahma 15. On the web site this is what it says. http://www.adireaudio.com/Files/BrahmaPowerHandling.pdf now I will be giving mine 600 watts rms from a PPI A600.2. What I came up with was a 5.05cu/ft box sealed. Is this correct? Because also on the website it says recomended sealed volume is 1.5-2.5 cu/ft and recomended ported is 2-3.5. So do I go by this chart and do a 5.05 cu/ft box sealed or not? Also what size box would I need to do a ported enclosure for this amount of power? Thanks for all the help. James
yes 600 watss will power it but in a much smaller box. running it in a 5.05 cu ft. box you will need all the power the brahma can handle. so around 1200 watts. you would need a like a 1.25 cu. ft box to run the brahma to its excursion. i mean sure you can give it 600watts in a 5 cu. ft box and it would take it no prob, but it will not reach its peak
yeah I have a jeep cherokee so that will fit. By the adire web-site it says the smaller the sealed box the more power you need and I thought it was the same way. Are you sure you are correct? I am pretty sure it is the other way around man. look at the link I posted above and you will see that it comes out to about 5cu/ft. Hey glass you there to help me out on this one man?
no man I am gonna keep the amp that I got I really love the amp and it is recomended by many to be a very good amp so I think I am gonna stick with it. Why would I get a new amp when I have the space to build a box that would bring my brahma to full excursion with the power that I have? I dont need a new amp or a new sub I just need to know what size box I should use from someone who knows what they are talking about. now I still need the answer to my ? in my first post if anyone can help if not please dont post. thanks James
Keep the amp definately. The Art series are some of the best amps ever made, and are by far the best amps PPI ever came out with. I'd stick with around 2.5-3 cu ft if you do a sealed box. You would push the Brahma close to full excursion that way, I won't really say it will do every bit of what it can with 600W, but it will do very well with it. Usually 800-900 watts gives good results with a sealed brahma, unless you're doing super-small boxes.
Really, I'd lean toward 2.5 cu ft sealed. Best all around box size. For ported, 3.5 tuned to around 26-28 like Adire recommends will work well. You'll hit full excursion below tuning, the problem is the Art series amps don't have a subsonic filter and it's usually best to use one with a ported box. Of course, if you tune to 26 hz, you really won't have too many issues with the sub stressing itself by playing too low, most music doesn't even touch anything near 20 hz anyway, usually it's 30hz and up.
yeah I talked to adira today and they said the exact same thing. Thanks Jonathan for the info and Joe you were also correct. Hey all the rest of you I understand you were trying to help but leave it up to the pro's to answer certain questions that are directed towards them not what you hear every day on this forum. But thanks for all the replies anyway.
"Just interested to know where you got the info for a brahma only needing 600w to get full excursion in 2.5cuft?" I didn't, I said it would reach close to it's capabilities. In a 3.5 cu ft ported, it would hit full excursion below tuning. 2.5 is pretty average for a 15" sealed box.
I don't have WinISD at work, so I can't double check. The 5cf box would allow it to reach max excursion with 600W. The 2.5cf box would allow you to get most of that power without any danger of frying the sub.
Just because your car has a redline, doesn't mean you should always drive it with the rpms up there.
My guess would be that you'd need around 900 RMS to reach close to full excursion with a 2.5 sealed, but keep in mind that it's just a guess. 600W will push it well, but again, it won't reach full excursion. In a daily setup it would be plenty.