I was thinking about making an IB setup in my J using the area between the rear trim piece in the trunk (where the gas tank sits) and the rear seat. I thought I would attach a piece of MDF to the trim piece as the baffle. Then I have to see about the room b/w the tank and the baffle to decide which way to fire it. Does anyone who knows about IB have any suggestions? Will this work? Will the front or rear waves hitting the gas tank have any effect? Am I missing anything?
These are the subs I was looking at for a sealed enclosure, not sure which can run IB yet:
SI Magnum D2 Adire Shiva Mark IV CDT HD12 ED E12O ID IDMaxRE RE12/SE12
Question about Infinite Baffle
The only key to IB set-ups is making sure the there's no "shared airspace" between the cabin and the trunk. If you put the board under the rear deck, but don't seal off the rear seat and around the baffle, the air/soundwaves that come around into the interior will cancel one another out. In other words the sounds will defeat itself.
Now, all but the first will conflict with your gas tank, but they're interesting nonetheless.
Not sure if any manufacturers list their subs as being "designed" for IB, but if you look for something that will work in a huge enclosure, you'll be on the right track.
Are you looking at IB to save space?
Now, all but the first will conflict with your gas tank, but they're interesting nonetheless.
Not sure if any manufacturers list their subs as being "designed" for IB, but if you look for something that will work in a huge enclosure, you'll be on the right track.
Are you looking at IB to save space?
Also, found this...
Quote »Infinite baffle set-ups require a woofer with a beefier suspension for high power handling and one with better cone damping. This set-up will be less efficient in reproducing the lowest frequencies as compared to other second order or higher enclosures.
In any free air application, the back seat and surrounding panels should be removed to seal any possible areas where energy could be lost. It is crucial to separate (seal) the back wave of the loudspeaker (woofer) from the front wave of the loudspeaker. If not, bass cancellation will occur. This is also a good time to rid and deaden the trunk and surrounding areas of any unwanted noises and rattles.[/quote]
Quote »Infinite baffle set-ups require a woofer with a beefier suspension for high power handling and one with better cone damping. This set-up will be less efficient in reproducing the lowest frequencies as compared to other second order or higher enclosures.
In any free air application, the back seat and surrounding panels should be removed to seal any possible areas where energy could be lost. It is crucial to separate (seal) the back wave of the loudspeaker (woofer) from the front wave of the loudspeaker. If not, bass cancellation will occur. This is also a good time to rid and deaden the trunk and surrounding areas of any unwanted noises and rattles.[/quote]
I want it for SQ and space - the J trunk is so small as it is. The last two options are what I described in my first post(front or rear firing from the rear of the trunk). As for the gas tank, in thinking about it, I'm not sure it would make a difference. It would just be taking up some volume like a second driver in a sealed enclosure. I think I can do the last one w/ just the one piece of MDF, though they're showing that U shaped baffle.
I'm pretty sure that I can't fit a 12 in the deck, and beyond that, it's more fabrication than I really want to do.
I'm pretty sure that I can't fit a 12 in the deck, and beyond that, it's more fabrication than I really want to do.
wow, thanks guys for bringing this up... i'd never heard of this type of enclosure... although it's confusing as hell as to why anyone would want to do this, i think i did learn something from it 
those subs you listed all seem to benefit from smaller sealed enclosures... adire brahma subs might do ok in this kind of setup... cool thread though. let us know what you end up doing...
those subs you listed all seem to benefit from smaller sealed enclosures... adire brahma subs might do ok in this kind of setup... cool thread though. let us know what you end up doing...
Just a little info on I.B.
This type setup is best for mid-bass applications, ie. 8's or 10's that have been given a "band-pass" signal from the crossover. Do not get that confused with the "bandpass box". The band-pass signal from the crossover would cut out the highs with a lowpass filter at about 500hz and low bass from, lets say, a highpass 90hz filter. What makes it bandpass is that it has a band between high and low filters that is allowed to be played. This is easier on the driver's suspension and allows for greater power handling. Just remember that Infinite Baffle applications make it so that your driver has 1/2 power handling.
I would say that the biggest pain in the a$$ about this setup is the extreme amount of rear deck reinforcement that is required. With larger drivers or higher power, it is necessary sometimes to weld in sheetmetal and then dampen it. Otherwise, you should invest in a sound deadening material company because their stock will go up when you purchace the correct amount needed for your IB setup.
Kicker used to make Infinite Baffle 6x9s that kicked butt, but unfortunately they dont anymore.
Dont let this discourage you though as the I.B. setup, when done correctly, is very space efficient and can sound/look really good.
P.S. NY94J30, I love the OZ Opera wheels. Those are so choice. I would love to put a set of those on the Q45 we have in the family.
This type setup is best for mid-bass applications, ie. 8's or 10's that have been given a "band-pass" signal from the crossover. Do not get that confused with the "bandpass box". The band-pass signal from the crossover would cut out the highs with a lowpass filter at about 500hz and low bass from, lets say, a highpass 90hz filter. What makes it bandpass is that it has a band between high and low filters that is allowed to be played. This is easier on the driver's suspension and allows for greater power handling. Just remember that Infinite Baffle applications make it so that your driver has 1/2 power handling.
I would say that the biggest pain in the a$$ about this setup is the extreme amount of rear deck reinforcement that is required. With larger drivers or higher power, it is necessary sometimes to weld in sheetmetal and then dampen it. Otherwise, you should invest in a sound deadening material company because their stock will go up when you purchace the correct amount needed for your IB setup.
Kicker used to make Infinite Baffle 6x9s that kicked butt, but unfortunately they dont anymore.
Dont let this discourage you though as the I.B. setup, when done correctly, is very space efficient and can sound/look really good.
P.S. NY94J30, I love the OZ Opera wheels. Those are so choice. I would love to put a set of those on the Q45 we have in the family.
Simm,
The Operas are on clearance ot the OZ website now - phenomenal price $189/ea (and btw, they look better in person, I have to get some better pics):
http://www.ozracing.com/usa/sh...dbb8e
Also, about the IB setup - I've seen alot of conflicting things on the internet. My initial thought - and it makes perfect sense - was that you would need to decrease power output to the driver as there is no air pressure to keep the components in place. Though some sites I have read have said the opposite, i.e. that more power was needed to reach the same excusion levels b/c of the lack of air pressure in an enclosure.
In any case, I am also going to see what kind of custom sealed enclosure I might be able to fabricate to fit in the area b/w the seat and the trunk liner. I'd rather have a sealed enclosure for SQ purposes but I can't take up any more trunk space. I think I can probably find a way to make a sealed enlosure that sits the cone flush w/ the rear trim piece of the trunk and amounts to about .75 - 1 ft^3.
The Operas are on clearance ot the OZ website now - phenomenal price $189/ea (and btw, they look better in person, I have to get some better pics):
http://www.ozracing.com/usa/sh...dbb8e
Also, about the IB setup - I've seen alot of conflicting things on the internet. My initial thought - and it makes perfect sense - was that you would need to decrease power output to the driver as there is no air pressure to keep the components in place. Though some sites I have read have said the opposite, i.e. that more power was needed to reach the same excusion levels b/c of the lack of air pressure in an enclosure.
In any case, I am also going to see what kind of custom sealed enclosure I might be able to fabricate to fit in the area b/w the seat and the trunk liner. I'd rather have a sealed enclosure for SQ purposes but I can't take up any more trunk space. I think I can probably find a way to make a sealed enlosure that sits the cone flush w/ the rear trim piece of the trunk and amounts to about .75 - 1 ft^3.
WOrd of caution. If I remember correctly, The pressure relief port for the J's air bag is in the trunk area. If infact it is and you do seal the seat area for I/B, pray the air bag doesn't deploy in an accident. The pressure wave from deployment WILL rupture your eardrums if there is no vent to amibent air.
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i have boxes sealed that hold 8s in the back deck.you can fit a .35 air spacen boxes there.were the bose speakers are.they work better for midbass,but in a pinch.8's also fit back doors.with tyhe right size sub box you will do much better that i.b...ive seen a brahma 10 at adire doing 10 hurts.man can they travel.helps livin close.have a custom box made if you cant to o to the side of the trunk.that way you have room.for groceries or whatever.like this.nevermind the p.o.s.jl in there.w6.stiil using spare in that pic.see the bottom