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Old 11-21-2012, 09:05 AM
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Ok things are coming together and Ill be building a box for my Frontier. The thing is, is that I don't have much room. I want to build a box that will hold two 8's or 10's but the thing is, is that I would need them to be mounted with the but end of the magnets facing each other and because of the small space I would have to have the magnets close to each other. Would that interfere with the sound?
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Old 11-21-2012, 09:20 AM
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You could try Isobaric.

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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 11-22-2012, 01:11 AM
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Originally Posted by audioarsonal View Post
You could try Isobaric.

In that image, the last two aren't isobaric. They are just dipoles.

OP: the magnets being near each other shouldn't be a big deal. What's a bigger deal is that you seem to want to fire each sub in an opposite direction. This makes it very difficult to load each driver equally against a reflecting surface, and will run into phasing problems. In general, it's better to have the subs on the same plane or firing at each other.
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Old 11-22-2012, 04:54 PM
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Out of curiosity what is the reason you want to run two instead of one?
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Old 11-23-2012, 09:17 AM
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OK your right about them pulling. I didn't really put that together but if I was to reverse polarity on one then wouldn't that make them on a push/pull basis.
Ive always had better luck with two over one. I was thinking that with a amp like Saz1500 or BC2000 that maybe I could get a nice 12"d2 and utilizing the air space for one 12 running 1ohm instead, but was afraid that it wouldn't kick as much as two 10's. I suppose now some one's going to school me on this matter.
Thanks for the replies,
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Old 11-23-2012, 09:27 AM
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Quote:
Originally Posted by SPLEclipse View Post
In that image, the last two aren't isobaric. They are just dipoles.

OP: the magnets being near each other shouldn't be a big deal. What's a bigger deal is that you seem to want to fire each sub in an opposite direction. This makes it very difficult to load each driver equally against a reflecting surface, and will run into phasing problems. In general, it's better to have the subs on the same plane or firing at each other.
You are correct in that they are dipole. However they can also be isobaric driven. Dipole refers to the direction in which the wave travels. But the way in which the drivers are wired (ie push pull) can in fact make them isobaric enclosures.
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 11-23-2012, 09:30 AM
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Quote:
Originally Posted by SPLEclipse View Post
In that image, the last two aren't isobaric. They are just dipoles.

OP: the magnets being near each other shouldn't be a big deal. What's a bigger deal is that you seem to want to fire each sub in an opposite direction. This makes it very difficult to load each driver equally against a reflecting surface, and will run into phasing problems. In general, it's better to have the subs on the same plane or firing at each other.
How is that not isobaric? Dipole would be woofers out of phase on opposite faces of the enclosure, right? This looks like a sealed enclosure with two woofers wired out of phase mounted face to face with a sealed chamber between them. Unless I am seeing it wrong...

Sorry to take that into the ditch there.
OP, I don't think you will have any issues with loading/cancellation with what you are proposing. I would be careful not to have the woofers actually touching butt-to-butt in the enclosure though.
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Last edited by Benny33; 11-23-2012 at 09:32 AM.
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Old 11-23-2012, 10:13 AM
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I was going to make sure that the butts of the mag. are at least 1" apart. I would put a divider between them but that just takes up more presious air space. Really do you guys think that I should utilize what little bit of space I have for one 12 over 2 8's or 10's. Im completely open to what I do, but I want it to hit. I like loud bass but rather SQ any day. It seems to me that 1500-2000 watts rms should push a SA12 or equivalent pretty good in a 1.0^3 box right. I think the real problem hear is that none of this is exact. 1+1=2, but with stereo stuff like this its all about opinion....unless you have meters hooked up like in competition's. I hate this shit and yet Im soooo addicted to figuring it out!!
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Old 11-23-2012, 10:27 AM
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Quote:
Originally Posted by SPLEclipse View Post
In that image, the last two aren't isobaric. They are just dipoles.

OP: the magnets being near each other shouldn't be a big deal. What's a bigger deal is that you seem to want to fire each sub in an opposite direction. This makes it very difficult to load each driver equally against a reflecting surface, and will run into phasing problems. In general, it's better to have the subs on the same plane or firing at each other.
I'll agree that as pictured they aren't iso loaded. But they are possible alignments of an iso-pair. As pictured, only the first is a isobaric alignment. The other two would need another enclosure of some sort. Otherwise, the middle one is exactly like the OP is talking about or push/pull.

I see no problem with the back to back alignment in the OP other than maybe the pole vents pushing hot air into each other or something. Can you invert one like the one pictured on the far right?
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Old 11-23-2012, 11:02 AM
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Honestly for simplicity and.cost sake I would say go with a single 12. I can't imagine it would have any less output than the setups you pictured with the 10s
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