some info needed/wanted
03-27-2004, 08:24 PM
#1
500 Watt CAFz'r
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Join Date: Sep 2003
Posts: 524
ok i've almost got my system done, but my subs dont sound like i want them too. i built a blow thru for 2 15's, which are in a 5 cube box(too big?) and they fire into a 3 cube chamber that vents into the cab thru a 8x43" opening thats 4" long. i guess its basically bandpass with an external port. the problem is that the subs wont play low, they hit really hard but lack the bottom end grunt, i'm sure my old tens had more bass you could "feel" if you know what i mean. what could i do to help this? even with the x over set at 20 hz (lanzar 1200d amp) they just dont play low. btw the 5 cube chamber the subs are in is sealed.
03-27-2004, 09:25 PM
#2
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What subs are they? I did a pass through in a full size chev with 2 15" MTX T61544A's, they were each in a separate 3.5 cubic foot enclosure tuned to 30 hz. It pounded and was actually the "tightest" bass I have heard in a long time, they sound awesome with punk rawk. I made sure the opening I cut was at least equal to the cone area and port area added together.
03-27-2004, 09:43 PM
#4
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Well I cetrtainly wouldn't want some random tuned bandpass in my car, I would make sure that the cutout from the cab to bed has at least the area of the cones if not more open. What is the recomended box volume for those subs? With sealed boxes a generall rule of thumb is that in a smaller space (interior) the boxes have to be bigger and in a bigger space (interior) the boxes can be smaller for a given response.
03-28-2004, 01:19 AM
#8
hey Anthony, sorry i didnt get back to u in a while. school stuff just flooded my email account so i lost track of all the incomming male.
this is what i would do. you said your subs a 6 inches from each side so that gives u room to put in a 4 inch port on both sides between the sub and the side wall in your 5.5 cube box. the ports would have to be 9 inches long each. that would tune u down to about 32hz and should pick up low notes much better.
so the front of the 5cu box would look somthing like this
ports go on both sides between the sub and the side walls. 4 inches in diameter and 9 inches long. if u can try to find some aero ports/flared ports to use. if not regualr 4 inch pvc pipe will be fine.
this is what i would do. you said your subs a 6 inches from each side so that gives u room to put in a 4 inch port on both sides between the sub and the side wall in your 5.5 cube box. the ports would have to be 9 inches long each. that would tune u down to about 32hz and should pick up low notes much better.
so the front of the 5cu box would look somthing like this
ports go on both sides between the sub and the side walls. 4 inches in diameter and 9 inches long. if u can try to find some aero ports/flared ports to use. if not regualr 4 inch pvc pipe will be fine.
03-29-2004, 07:30 PM
#10
500 Watt CAFz'r
Thread Starter
Join Date: Sep 2003
Posts: 524
well i did it and it works awesome, it sounds so much more powerful now, like 15's should, thanks a bunch man. just some fine tuning with crossover and eq and i'm set. the only problem now is when i turn it up, everything goes blurry lol [img]smile.gif[/img]
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