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Considering 6.5" IB subs in place of boxed 10" sub

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Old 02-09-2007, 06:41 AM
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Considering 6.5" IB subs in place of boxed 10" sub

Future tuning will tell me a lot, but I am not blown away by my current sub, an IDQ 10.

I am CONSIDERING yanking the rear 6.5" (stock) coaxials and using 2 6.5" IB subs or even a good set of 6.5" mids and deleting the sub/box combo altogether.

I heard an Explorer with a set of well-installed and well-tuned 6.5 comps and no subs. I was amazed by the sound. He had the doors properly deadened and had 75W going to each speaker.

I was thinking about a pair of 8 ohm 6.5s in the rear deck, which I would deaden extensively. I would bridge the rear channels of my 50 x 4 Xtant amp (as it is now) and run the 6.5"s in parallel to present a 4 ohm load to the amp. Each rear 6.5" should see about 100w. I would low-pass at 125 hZ (most likely) and POSSIBLY (probably) use a subsonic filter to protect my subs.

What are people's thoughts on this option? First, it would give me more trunk space, and second, it would be a pretty unique setup.

I am in no way a basshead. I like nice "kick" to my music, which is mostly rock and alternative.
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Old 02-09-2007, 07:12 AM
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I would go with replacing the stock sub and putting in a 8 in there in stead. the 8 should be able to get lower than the 6.5's. Pat if you want an AA 8 i'll sell ya one for $40 shipped.


Also you don't need a subsonic filter on the IB subs since the trunk will act as an enclosure. You could also go with dual 4 ohm 6.5's and wire them in parallel to get a 2ohm load and just wire it up to a single channel on the amp instead of bridged, that'd give you the same output.
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Old 02-09-2007, 07:29 AM
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Originally Posted by nismos14
I would go with replacing the stock sub and putting in a 8 in there in stead. the 8 should be able to get lower than the 6.5's. Pat if you want an AA 8 i'll sell ya one for $40 shipped.


Also you don't need a subsonic filter on the IB subs since the trunk will act as an enclosure. You could also go with dual 4 ohm 6.5's and wire them in parallel to get a 2ohm load and just wire it up to a single channel on the amp instead of bridged, that'd give you the same output.
What impedence is the AA?

I have a few VC configurations that will work, but S8 or D4 (assuming 2 subs) are the most logical/common.

I hesitate to use the assassian in the OEM sub location because of how I want to mount the amp in that spot. You saw the pic in that other thread, right? I want to make a platform and suspend the amp under the rear deck. That will give me full use of my trunk (minus the volume of a sub box, if I go that route).

IDK what it is about the ID 10 that I don't like...it is hard to put my finger on it. BUT I have not tuned the system at all- I cannot access the gain screws right now due to technical difficulties involving stripping the amp mounting screws...
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Old 02-09-2007, 07:32 AM
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I would def wait to do some tuning, it'll make a world of difference. The old assassins only come in 4 ohm svc.
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Old 02-09-2007, 07:50 AM
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Originally Posted by nismos14
I would def wait to do some tuning, it'll make a world of difference. The old assassins only come in 4 ohm svc.
I am just feeling things out right now. Right now my rears are stock. I have considered running aftermarket 6.5s back there nd powering them with the HU. That should increase in-cabin bass at least a bit. I am also removing the stock sub to allow sound to better pass from the trunk, but with the sound properties of sub-bass, I don't know that it will make much of a difference.

Right now it is too cold and my wife is on my @$$ too much about interior (house) projects to really play with anything in the car.
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Old 02-09-2007, 07:54 AM
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Definately take out the oem sub, it'll make a bigger difference than you expect.
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Old 02-09-2007, 08:44 AM
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Originally Posted by phenryiv1
I am just feeling things out right now. Right now my rears are stock. I have considered running aftermarket 6.5s back there nd powering them with the HU. That should increase in-cabin bass at least a bit. I am also removing the stock sub to allow sound to better pass from the trunk, but with the sound properties of sub-bass, I don't know that it will make much of a difference.

Right now it is too cold and my wife is on my @$$ too much about interior (house) projects to really play with anything in the car.
removing the sub will def. help the bass...
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Old 02-09-2007, 11:06 AM
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Would you bother putting aftermarket mids or coaxial in the rear deck? They'd be running off of the rear channels of the HU, which can be band-passed (80/125-approx. 400) or in HP at 80/125.

If so, which would you do?
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Old 02-09-2007, 11:15 AM
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no sense in putting anything in the rear without a dedicated amplifier. Take out the sub and see how the 10" sounds.
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Old 02-09-2007, 11:30 AM
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Yea either leave the oem rear deck speakers, or just remove them all altogether, no sense in spending more money.
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Old 02-09-2007, 11:30 AM
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It isn't the output that is bothering me...it seems like the sub is very loose.
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Old 02-09-2007, 11:56 AM
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refresh my memory...sub(new or used), enclosure, power?

edit: I see it's an IDQ 10...
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Old 02-09-2007, 12:10 PM
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I just re-checked your other thread and that box is WAY TOO BIG for that sub. Measure the box and plug it into here..http://www.bcae1.com/spboxnew2.htm

and see how big it is. You are experiencing a sealed box qtc that is lower than most people like for in car enclosures. Either build a new box, or put pieces of wood in there to lower the space in there.
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Old 02-09-2007, 12:12 PM
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Originally Posted by slickrick
I just re-checked your other thread and that box is WAY TOO BIG for that sub. Measure the box and plug it into here..http://www.bcae1.com/spboxnew2.htm

and see how big it is. You are experiencing a sealed box qtc that is lower than most people like for in car enclosures. Either build a new box, or put pieces of wood in there to lower the space in there.
You know, i THOUGHT that that box looked too big. The sub just seemed uncontrolled...

Interior vol is .87-.93 (I cannot remember if it is 5/8" or 3/4" wood). ID tech support recommends .75. Sounds like I have a date with some wood blocks.
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Old 02-09-2007, 12:16 PM
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Originally Posted by phenryiv1
You know, i THOUGHT that that box looked too big. The sub just seemed uncontrolled...
100% positive its the box...I checked the specs on the v2 version of your sub, and these subs are small, very small box woofers. You will lose some low end, but it will appear "louder" and be "tighter" in the 45hz and up area which is what you are looking for. Literally just throw some wood or something in there, and play it and see how it sounds, then take it from there.
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Old 02-09-2007, 12:29 PM
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Sweet, hopefully problem solved!
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Old 02-09-2007, 12:38 PM
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IF (and I stress IF) I was willin gto run 2 amps, I put that RF 250a2 on the sub and bandpass some mids on the 2 channes of the Xtant that are currently bridged to the sub.

But I'm not running 2 amps...
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Old 02-09-2007, 12:40 PM
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Do it! No reason not to really except maybe space issues...?
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Old 02-09-2007, 01:12 PM
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Well, the 404m draws a max of 60A. I don't know if adding a 2nd amp is the best idea.
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Old 02-09-2007, 01:21 PM
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just put some wood in there...
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Old 03-05-2007, 12:50 PM
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With the now Hertz installed, I am still considering this. I have not gotten around to "fixing" the ID, but from a simple space-saving and efficiency standpoint, I am still interested in this idea...

SQ from the fronts is enough, and I don't listen to a lot of bass-heavy music. Even with the sub off, there is almost enough bass. Has anyone ever run "small" subs or mids w/o a "real" sub in the trunk?
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Old 03-05-2007, 12:58 PM
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You could try some Dayton 6.5's from PE, the ones I'm using in my doors play down to 35hz and sound good, but they have so many different options...

I'm running these in the doors
http://www.partsexpress.com/pe/showd...number=295-335
They're pretty bassy, I'll be replacing them with these

http://www.partsexpress.com/pe/showd...number=295-374 shortly.

Someone on ca.com is sellling these
http://www.partsexpress.com/pe/showd...number=295-350
for $50 shipped
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Old 03-05-2007, 01:00 PM
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Originally Posted by nismos14
You could try some Dayton 6.5's from PE, the ones I'm using in my doors play down to 35hz and sound good, but they have so many different options...

I'm running these in the doors
http://www.partsexpress.com/pe/showd...number=295-335
They're pretty bassy, I'll be replacing them with these

http://www.partsexpress.com/pe/showd...number=295-374 shortly.

Someone on ca.com is sellling these
http://www.partsexpress.com/pe/showd...number=295-350
for $50 shipped
Want to sell me your 7" Daytons? They are 8 ohm, which is what I wanted.
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Old 03-05-2007, 01:00 PM
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Make me an offer.

Btw, these would be a decent choice too http://www.partsexpress.com/pe/showd...number=295-305

I would go with 8 ohm drivers so you can wire them down to 4ohm and bridge the rear channels of the amp to them.
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Old 05-06-2007, 08:17 PM
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Originally Posted by nismos14
I would go with replacing the stock sub and putting in a 8 in there in stead. the 8 should be able to get lower than the 6.5's. Pat if you want an AA 8 i'll sell ya one for $40 shipped.


Also you don't need a subsonic filter on the IB subs since the trunk will act as an enclosure. You could also go with dual 4 ohm 6.5's and wire them in parallel to get a 2ohm load and just wire it up to a single channel on the amp instead of bridged, that'd give you the same output.
Id be interested in the AA subs.
email me at rynell1177@hotmail.com
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Old 05-06-2007, 08:20 PM
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Long gone sorry.
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Old 05-06-2007, 09:31 PM
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Going truly IB requires a bit of time, patience and alot of little tweeks between cabin and cargo area. This will also eat away at your pockets to completely seal each other off. Just remove the the rears and see how you like the sub then.

In all reality and well planned and executed IB setup is unparalleled with any enclosure, but as stated above its alot of work to get there.
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Old 05-10-2007, 05:49 AM
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I am about to revisit my subwoofer situation as soon as I get settled into the new place. Since the consensus on here and CA.com seems to be that my 6.5s are not the best for IB subbass work, could I build little enclosures as a part of my under-deck amp rack?

I have to build a new box for my sub as it is, so if I am building, I might as well build a permanent (yeah, right) setup. I could undermount boxes below the rear deck with the back/bottom of the box being formed by the mounting board for the amp.

I was thinking about sandwiching the speaker mounting flange between the baffleboard/top of the box and the mounting rings, then attach the rings to the rear deck from below. The amp would be suspended between the boxes.

Thoughts?
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Old 05-10-2007, 06:15 AM
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Sounds good, the concept by your description is a little bit hard for me to visualize.... I think I get it though.

It should be interesting!

I have a new project coming somewhat similar to my old but with a twist, hopefully getting rid of the torsion bars and doing some hood struts too.
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Old 05-11-2007, 02:48 PM
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Originally Posted by Pearl96Max
Going truly IB requires a bit of time, patience and alot of little tweeks between cabin and cargo area. This will also eat away at your pockets to completely seal each other off. Just remove the the rears and see how you like the sub then.

In all reality and well planned and executed IB setup is unparalleled with any enclosure, but as stated above its alot of work to get there.
I'm doing the same setup. I mounted to 6.5 subs to my reardeack on top of a mdf ring. I put sound deadening material on the top and bottom of the rear deck and have some edead teklite on top and bottom. I've put sdm in the cabin and inside of trunk to seal it off from each other. What else do you recommend?
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Old 05-14-2007, 11:25 AM
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I Was actually thinking of doing this same set up, get some 6.5 Subs and putting them in my rear deck where my rear deak speakers are cause one of them are blown, the only thing is tho im still using the BOSE HU, and it seems to be that the person who had the car before had the rear speakers running straight of the HU because i haven't seen any BOSE amps in the truck anywhere.

Can this set up be done just running some 6.5 subs straight off the stock BOSE HU w/o an amp?
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Old 05-14-2007, 11:27 AM
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Originally Posted by DomoMaxima98
I Was actually thinking of doing this same set up, get some 6.5 Subs and putting them in my rear deck where my rear deak speakers are cause one of them are blown, the only thing is tho im still using the BOSE HU, and it seems to be that the person who had the car before had the rear speakers running straight of the HU because i haven't seen any BOSE amps in the truck anywhere.

Can this set up be done just running some 6.5 subs straight off the stock BOSE HU w/o an amp?
No. ten char.
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Old 05-14-2007, 11:47 AM
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You could but you'd probably want more power.
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Old 05-15-2007, 10:53 AM
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Originally Posted by phenryiv1
No. ten char.

........huh?
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Old 05-15-2007, 11:05 AM
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Originally Posted by DomoMaxima98
........huh?
I was saying "no." There is a minimum of 10 characters in a post.

You'll learn.
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Old 05-15-2007, 11:07 AM
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I'm going IB again
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Old 05-15-2007, 01:16 PM
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Originally Posted by phenryiv1
I was saying "no." There is a minimum of 10 characters in a post.

You'll learn.
O ok now i get it makes sense.. thanks!
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