mj18m ib

[lithium 358]

ive been curious about running one of these ib. i have 300rms at 4ohm available. im going to be upgrading to a 2way active front stage and im considering ib for some improved sq but i dont want to lose tomuch spl.... currently i have a 12" AA arsenal in 2.2 cubes tuned to ~30 hz seeing 600rms (my amp is 300rms at 4, 600 at 2 /= kenword excelon kac x10d). i still need to take some messurements to see if it will fit in the ski way. maybe ill have to find a 15 or two...

if i was to sell my sub and amp i bet i could get about 300-350 for them or about 200-250 for the sub/box.

what does a sub need to be run ib? ive read either lots of cone area or lots of xmax?

[JimJ 11]

Should work fine

Volume-wise it'll be more than loud enough to get to realistic levels; now, if you want to go beyond what's realistic IB will not be for you

[lithium 358]

i like to feel alittle bump but in no way am i looking to flex the roof... i think after geting the hu and installing an active front stage ill be more then happy to lose alittle spl. however i think the 18 will hit the low end alot better.

and if for some reason i could still throw another mj in there... if i have the room.

ill go messure that now

[JimJ 11]

You'd have to be careful with another 18", even with one the trunk is not really "IB" in the classic sense of 4x to 10x Vas, I'm not sure I'd go any more than that.

[lithium 358]

ohya i was wondering about that. how much can u run ib? i have a fairly large trunk, '00 olds intrigue. is it possible to do like 2 15s or 2 12s? ( edit: just realized u gave a formula so ill run the numbers)

what are some others subs besides the mj18m that i could use? (smaller diameter)

ill take some measurements when it stops raining.

Edited September 6, 2008 by lithium

[lithium 358]

i was looking at my car's specs online and it says i have like 16.5 cubes in the trunk but your saying 4x the vas... 210liters times .0353 is about 7 cubic feet x 4 = 28 cubes. so i see what u mean.

ok rain looks like its over so ill get some numbers

Edited September 6, 2008 by lithium

[JimJ 11]

It's not a fixed rule, it's just what's commonly specified at least for home use. The worst that could happen is that you end up with basically something that falls within the recommended sealed enclosure specs, which still will sound very good

Even one 12" will give very good results in a setup like this...I really like Dave's Icon in the rear deck with 500W or so.

[lithium 358]

i can do 12's like this guy did. rf ib install

but i could build like a half box afew inches back from the opening of the ski way for 15's or an 18. im not going to modify the rear deck in anyway.

[///M5 2,833]

im considering ib for some improved sq but i dont want to lose tomuch spl....

From that statement I am not so sure that IB is for you. Whenever anyone uses the word bump or SPL it is really the complete opposite of what you asked for earlier in the sentence. Expect a lot less output capability from a sub mounted IB versus a conventional box.

[lithium 358]

ya i'm beginning to think that it might not be enough... i would like to try a 15 or 18 that i can run ib and see if i like it and if i dont i could then run it sealled... it would have to be a dvc 2ohm

i dont consided the sub i have now to have great spl but maybe i dont quite understand how much spl i would lose ib...

any idea's

[ANeonRider 3]

Use a sealed enclosure.

[lithium 358]

haha thought id get that response... wish i would have got a 15 arsensal... can u rebuild the 12 into a 15 with a recone and basket?...

[JimJ 11]

Yes, but if it's SQ you're after I don't see the point for doing it.

[lithium 358]

i dont think im looking for all out sq... but i think a 15 sealled would have a balance of sq and spl that id like. then again im using a relatively cheap driver...