I know the general rule of thumb is to run your amp in stereo if the sub box has seperate chambers and mono if its one airspace...
The thing is that I already knocked down the center wall in my box making it one airspace when i had my speakers in mono on my old alpine v12. (too lazy to calculate the many wierd shapes of the box)
my subs almost twce as hard when i ran the amp in stereo (2ohms 2x450rms) as opposed to 1x500rms mono 4 ohms (not 2ohm stablein mono). Only did a test run with a 1khz to 20hz sweep and a couple of good ol songs on the radio.
bascially speaking i just wanted to know if any of you have ran your amp in stereo for a dual sub single air space box without having any long term damage to your speakers. or if there was a noticeable difference in SQ.
ps. and yes my speakers are dvc-4ohm so they can run at 2ohms.
RTM
Replies (4)
Swez on 05/27/2003 16:29:01
Depends on the amp and subs... but looks like you can do either here with equal results:
1. Bridge the amp MONO and run the subs series/parallel for a 4 ohms load
2. Keep the subs 2 ohms as is and run one sub per channel
The output is exactly the same as far as most amps and subs are concerned. If you do notice a difference either way, something is odd and does not add up. You should get the same power to subs in either method mentioned.
About multiple subs in same box, no divider.... can do it, but if you push the subs hard and one blows out, the other sub will have 2x recommended box size and will probably fail shortly with X-max excursion issues created by loss of one sub.
Personally, I never build dual sub boxes w/o a divider. It adds strength to the box as well as protect the remaining sub, if one does die.
For what that's worth,
Swez
Relax_The_Mind on 05/27/2003 23:29:53
Mr. Swez
Yeah... I pretty much blew one of my old MTX 6000s that way. I had them hooked up in mono but with a divider (the prefab box didnt have them the same about .2^ft off) and the one with the bigger chamber blew. As smaller boxes handle more power.
I tore down the wall not only to keep the displacement even, but if a divided box has one chamber with a small difference in size they are going to be playing different frequencies at any level which cuts on SQ quite a bit.
Oh and about the box. i have them in the somewhat sort of trunk in the back of my '90 camaro. so the box sits perfectly in it so the structural ingerity is somewhat not compromised.
Another note when i rotozipped the divider out i left like 1" on the sides and 2" on the top to keep the box strong. which is actually good advice for people that decide on breaking down the wall.
And if any of my subs decide to die I really want to try out them Adire Brahma subs you were talking about in another thread. according to the specs all I would ever need is one 15" and i can easily mod my box for one.
RTM
Swez on 05/28/2003 11:36:19
Yep, sound like the 6000 was not enough for your amp and just gave up... These are more or less entry level subs... nothing special, but good for low powered systems, if the box dimensions are close to sub specs. If you throw more than about 250 RMS to these subs... they will be toast! Even less power in larger sealed or vented enclosure.
See specs: http://www.crutchfield.com/cgi-bin/S-ggT65CLJYNs/ProdView.asp?s=0&c=10&g=67700&I=236T6124A&o=m&a=0&cc=01&avf=N
QUOTE: "I tore down the wall not only to keep the displacement even, but if a divided box has one chamber with a small difference in size they are going to be playing different frequencies at any level which cuts on SQ quite a bit."
Not that much of a factor in separate chambered boxes... very slight differences are tolerable in chamber sizes. But off by more than 5% either chamber, the tonal qualities might change a tad for each sub.
What amp is that you are running here for your subs? A weblink would be nice... are we talking an Alpine V-12 or other amp? Must be an older amp as newer Alpines have nothing close to that power rating (RMS) in present product lines.
Brahma 15"... yeah baby, a real power house here... 1600 watts RMS , DVC 1/2/4 ohms. If you have a 2 channel amp here, can run it MONO bridged to a 4 ohms load or each VC to a separate channel. Best if you run MONO with a single sub though. Gonna need some real potent amping power to get this brute to full potential. (1000 watts RMS min)
Swez
PS Can crop the Mr. Swez if you like... we are very informal here RTM.
Appreciate the the added respect... but no need OK?
PSS You have ~+/-10% fudge factor on enclosure dimensions... much more that 10% smaller/larger will change the sub power handling and performance characteristics.
xplicitblitzboi on 05/28/2003 14:47:37
I wish i had a brahma, damn, lol, or an inhuman would be nice to have too. but then u gotta have the amps to power em, and thats not cheap either. once you get into that stuff, theres no turning back. thats a lot of cash to drop, but its good stuff. gotta have a pretty good charging system too with all that current draw.
and yeah, btw, like swez said, were all real casual around here, so u can call us whatever you please, as long as its not offensive ;) hehe, its kinda funny that you talk with these people so much that you just get to calling them by their name on the forum, like a friend of mine on my other forum, i've been talkin with him for i dont know how long, and i still dont know his name. I just call him kiki. his login name is kikithecat....
anyways, my names derek....
Blitz
The thing is that I already knocked down the center wall in my box making it one airspace when i had my speakers in mono on my old alpine v12. (too lazy to calculate the many wierd shapes of the box)
my subs almost twce as hard when i ran the amp in stereo (2ohms 2x450rms) as opposed to 1x500rms mono 4 ohms (not 2ohm stablein mono). Only did a test run with a 1khz to 20hz sweep and a couple of good ol songs on the radio.
bascially speaking i just wanted to know if any of you have ran your amp in stereo for a dual sub single air space box without having any long term damage to your speakers. or if there was a noticeable difference in SQ.
ps. and yes my speakers are dvc-4ohm so they can run at 2ohms.
RTM
Replies (4)
Swez on 05/27/2003 16:29:01
Depends on the amp and subs... but looks like you can do either here with equal results:
1. Bridge the amp MONO and run the subs series/parallel for a 4 ohms load
2. Keep the subs 2 ohms as is and run one sub per channel
The output is exactly the same as far as most amps and subs are concerned. If you do notice a difference either way, something is odd and does not add up. You should get the same power to subs in either method mentioned.
About multiple subs in same box, no divider.... can do it, but if you push the subs hard and one blows out, the other sub will have 2x recommended box size and will probably fail shortly with X-max excursion issues created by loss of one sub.
Personally, I never build dual sub boxes w/o a divider. It adds strength to the box as well as protect the remaining sub, if one does die.
For what that's worth,
Swez
Relax_The_Mind on 05/27/2003 23:29:53
Mr. Swez
Yeah... I pretty much blew one of my old MTX 6000s that way. I had them hooked up in mono but with a divider (the prefab box didnt have them the same about .2^ft off) and the one with the bigger chamber blew. As smaller boxes handle more power.
I tore down the wall not only to keep the displacement even, but if a divided box has one chamber with a small difference in size they are going to be playing different frequencies at any level which cuts on SQ quite a bit.
Oh and about the box. i have them in the somewhat sort of trunk in the back of my '90 camaro. so the box sits perfectly in it so the structural ingerity is somewhat not compromised.
Another note when i rotozipped the divider out i left like 1" on the sides and 2" on the top to keep the box strong. which is actually good advice for people that decide on breaking down the wall.
And if any of my subs decide to die I really want to try out them Adire Brahma subs you were talking about in another thread. according to the specs all I would ever need is one 15" and i can easily mod my box for one.
RTM
Swez on 05/28/2003 11:36:19
Yep, sound like the 6000 was not enough for your amp and just gave up... These are more or less entry level subs... nothing special, but good for low powered systems, if the box dimensions are close to sub specs. If you throw more than about 250 RMS to these subs... they will be toast! Even less power in larger sealed or vented enclosure.
See specs: http://www.crutchfield.com/cgi-bin/S-ggT65CLJYNs/ProdView.asp?s=0&c=10&g=67700&I=236T6124A&o=m&a=0&cc=01&avf=N
QUOTE: "I tore down the wall not only to keep the displacement even, but if a divided box has one chamber with a small difference in size they are going to be playing different frequencies at any level which cuts on SQ quite a bit."
Not that much of a factor in separate chambered boxes... very slight differences are tolerable in chamber sizes. But off by more than 5% either chamber, the tonal qualities might change a tad for each sub.
What amp is that you are running here for your subs? A weblink would be nice... are we talking an Alpine V-12 or other amp? Must be an older amp as newer Alpines have nothing close to that power rating (RMS) in present product lines.
Brahma 15"... yeah baby, a real power house here... 1600 watts RMS , DVC 1/2/4 ohms. If you have a 2 channel amp here, can run it MONO bridged to a 4 ohms load or each VC to a separate channel. Best if you run MONO with a single sub though. Gonna need some real potent amping power to get this brute to full potential. (1000 watts RMS min)
Swez
PS Can crop the Mr. Swez if you like... we are very informal here RTM.
Appreciate the the added respect... but no need OK?
PSS You have ~+/-10% fudge factor on enclosure dimensions... much more that 10% smaller/larger will change the sub power handling and performance characteristics.
xplicitblitzboi on 05/28/2003 14:47:37
I wish i had a brahma, damn, lol, or an inhuman would be nice to have too. but then u gotta have the amps to power em, and thats not cheap either. once you get into that stuff, theres no turning back. thats a lot of cash to drop, but its good stuff. gotta have a pretty good charging system too with all that current draw.
and yeah, btw, like swez said, were all real casual around here, so u can call us whatever you please, as long as its not offensive ;) hehe, its kinda funny that you talk with these people so much that you just get to calling them by their name on the forum, like a friend of mine on my other forum, i've been talkin with him for i dont know how long, and i still dont know his name. I just call him kiki. his login name is kikithecat....
anyways, my names derek....
Blitz
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