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Old 30th June 2009, 03:51 AM   #41
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You sure don't waste any time do you. You build boxes faster than some of us can type. I'm not a fan of Isobarik but since you are on a whirlwind tour of building speakers I say go for it.
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Old 30th June 2009, 03:52 AM   #42
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ohhhh man do i ever want those specs... one thing if i drive them of an amp with fullrange to get the 100 watts per sub is there any way i can x-over them without a bunch of complicated electronics or an expensive x-over?
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Old 30th June 2009, 04:05 AM   #43
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Quote:
Originally posted by mulletdude
ohhhh man do i ever want those specs... one thing if i drive them of an amp with fullrange to get the 100 watts per sub is there any way i can x-over them without a bunch of complicated electronics or an expensive x-over?
No problem I will get you ALL the info I have w/pictures !
Yes you can , you can go passive but that draws some power and is hard to tune .
Another idea (NO MAKING FUN OF ME) but you can use a car electronic XOVER (STILL NO MAKING FUN OF ME)
You can use a wall wort to get the 12v power .
A wall wort is those square things that plug in the wall (like what they use for cordless phones and such ...
If that sounds complicated you can buy a high power passive sub xover (goes inline with the speakers) from parts express $20 ..
Please dont laugh at my idea of a car xover at home !!!!
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Old 30th June 2009, 04:14 AM   #44
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okay 2 more questions...
1. i have a 5.1 home theatre amplifier and i have 4 subs could i put a x-over inline before it gets to the amplifier and have the amp deliver sub out to all 5 outputs then use it to power all 4 of my subs one in each corner of the room.
2. these 15 inch jbl subs are 2 different models with the specs listed above in my 2 posts... can i still use them isobarik because their xMax is different by 2.6 mm?
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Old 30th June 2009, 04:16 AM   #45
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There is absolutely nothin' wrong with using a 12V car crossover like an Alphasonic EX-3B. Much better than trying to passively cross anything below ~200hz. Hold you head high and be proud of your ingenious use of parts not exactly intended to be used in a new creative way.
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Old 30th June 2009, 04:18 AM   #46
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i am considering using a professional crossover in line with the input of my amplifier if that will work.
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Old 30th June 2009, 04:23 AM   #47
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(1)
you are talking of using your 5.1 SUB out to drive your subs , CORRECT ?
The sub out is allready crossed over , usually around 100 hz .
(2)
You should use the same model subs in a isobaric , if you dont they will fight each other , one moves further so it will push the other too far , one may be more effeciant (same thing will result)
basically all you could do is build one big box and thr internall divider may be not in the center this way each box will get the proper cabinet size .
And then run one sub signal to both drivers .
BUT ..
you may find one driver will bottom out before the other .
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Old 30th June 2009, 04:25 AM   #48
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no i am talking about crossing over the input to my 5.1 amp and then using 4 of the 5 fullrange outputs that would then be crossed over to sub freq's to drive one of each of my subs...
EDIT
both the 15 inch JBL subs are 97 Db efficient but the ones xMax is 7.6 mm and the others is 5 mm...
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Old 30th June 2009, 04:29 AM   #49
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Quote:
Originally posted by mulletdude
i am considering using a professional crossover in line with the input of my amplifier if that will work.
I found a NICE little unit its a ENERGY EAC its a outboard x-over that xover was built to run their upper line subs .
It was $140 NEW .
It is a 2 way unit with adjustable points for the high amp and the sub amp ..
Plus 100% adj sub phase points (not really usefull for most folks) .
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Old 30th June 2009, 04:29 AM   #50
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i can get an inline pro x-over for 20 bucks from a bud.
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