Can I just cram an 8 inch sub in there for now?

[95ExplorerLtd]

Can I just stuff an 8 inch back in that box in the wall until I can afford a Thunderform? I cant find 6 1/2 subs anywhere.

 

[Ru Dawg]

Take your time!

Don't rush into man! If you want the best quality, save your money until you can get what ya want. Yes, you could just stuff an 8 back there, but here's the problem...most subs are designed to be in an enlosure! So you would be wasting your money to buy an free-air sub, then turn around and buy another one once you get your enlosure. Since it sounds like you have a budget (which I think most of us do!), have ya checked out www.sounddomain.com ? Looks like they have GREAT prices! Good luck man!

 

[95ExplorerLtd]

Well can I keep the 6 1/2 in the wall and get an 8 in a box with like a 2channel amp and wire it all together? I know about watts and amps and all the stuff you need for power, but I dont have the slightest idea on wiring.

 

[Ru Dawg]

I don't think so!

Unless both subs are rated for the same RMS AND PEAK wattage, then I don't think you can do that. I am assuming the 6 1/2 you are talking about is the JBL sub that came stock? I know of them but never seen 'em. You could however still get the 8 in a box and run it off a seperate amp, but I would get a single channel for that, unless you plan on adding more, then you can get an amp that can be 1,2,or even 4 channels, depending on how you wire it up. For example, some subs if used as 2 channel will be 150w X 2 or if used a single channel will be 300w X 1.

 

[mrsteve]

Actually when you bridge a 2 channel amp you usually get 4 times the RMS power. Example. RF punch 500a2 125wattsx2 RMS -- 500wattsx1 RMS bridged

 

[newbz]

I dunno, I bought a 10" pioneer free-air and i have it in a box now and it sounds better then it did in free air

 

[JTang]

You could to that, others have done it with what they considered no problem. As long as it's only an 8" there should be little problem. You just have to widen the hole, and make sure you get a sub that will support that tiny amount of air space. If you don't it's not going to hurt the sub, but the sub will hardly move with little volume, and the bass will be too tight and ultra punchy.

It would only be a free air sub if you put a sub in there with "unlimited" space, or what the sub perceives as *NOT* a sealed enclosure. Go ahead and get a sub made for a sealed enclosure, but don't rip off the front of the box to make your own cover unless you can unsure it's sealed. If you're able to keep the enclosure sealed and simply make the opening bigger for an 8, there shouldn't be any problem.

In the best scenario, you want a subs RMS to match the amps RMS, but it isn't mandatory. Just give it a healthy amount of power. Make sure your sub's pretty shallow to allow a good amount of space behind it.

If you're really just wanting to replace the stock sub, crutchfield sells the dedicated 6.5 subs individually I believe.

Have fun!

Jon

 

[Ru Dawg]

Originally posted by mrsteve
Actually when you bridge a 2 channel amp you usually get 4 times the RMS power. Example. RF punch 500a2 125wattsx2 RMS -- 500wattsx1 RMS bridged

Must depend on how it's made..A Boss REV-435 is 240w rms bridge or 120x2???

And yes a free-air sub can be enclosed, but it's not recommended to free-air a sub that's designed to be enclosed.

 

[95ExplorerLtd]

I looked through my crutchfield magazine and all i could find was a 6 1/2 bazooka, but no regualr subs that you just hook up.

 

[mrsteve]

Call them they stock more than what is on their site or in their catalogs

 

[HPExplorer]

No

Hey guys, It seems like this thread needs a lot of help. I don't want you getting the wrong information. There are a lot of corrections that need to be made with what has been posted to this thread previously.

1) When you bridge a 2 channel amp you get 2x the power, you can double that again if you wire your subs in parallel.

Example: Amp=150Wx2 into 4ohms => 300x1 into 4ohms
Two 4ohm subs in parallel = 2 ohms
Amplifier outputs 600wx1, subs see 300W each

2) The subwoofer enclosure from the factory is designed specifically for that particular subwoofer. You will most likely get "better" sound from your 6.5" factory sub. It all depends on what you are after. If you are all about more bass, then you are definately not going to get it by simply slapping an 8" sub into the factory box. If it is sound quality you are after, stick with the 6.5" until you can build the correct sized enclosure. It all depends on how much you know about enclosure design and the theile-small parameters of the replacement driver.

If you have any more questions, your best bet is to email me at ajkomare@mtu.edu. Time to go to class - good luck!

Anthony Komarek
Mechanical Engineering Graduate Student - Noise Vibration & Harshness
Michigan Technological University

 

[JTang]

Almost

Hi HPExplorer, welcome to the boards!

1. Theoretically, that is what's supposed to happen. With most amps, that is what will happen, perhaps in the continuous value range. However, not all amps, even some name brand amps will have that power rating. A lot of amps, even the Kenwoods and Clarions will limit the power ratings when bridged or in two ohms so that it doesn't exactly double. This is where the above posts get different information, both are correct. The Boss amp is one of those that's made to keep the power down so it won't blow out since it's not heavy duty.


2. Although it's quite true that the subs need the correct enclosure volume for optimum sound, the problem with the assumption is that the box was perfectly made for the sub, and that the sub is already a good performer which is not true. The current sub is utter crap which implies that the box, or the sub (or both) really isn't even playing to its potential anyway (if it really has one). All the people who have done this mod feel that the replacement of the 8 was a better choice. If it's playing at the optimum performance, your guess is as good as mine. However, if it's going to play better than the stock 6.5", I think that would be a resounding yes. I don't know if the sub is made by Audiovox as well, or just the normal speakers. We're talking about a company that wouldn't even put reliable tires on its truck.

HPExplorer, what's the best way to kill standing waves inside a box; is polyfill all that's needed, or can the depth of the box have a difference in how to elminate "dead" sound? Since you're in ME with Specialization in Noise Vibaration and Harshness, you'll be bombarded with Q's by me! Apology in advance.



95ExplorerLtd -
MrSteve's right. Call 'em, they do have stuff in stock, and if it's not in the catalog, it's usually because it's low stock and more than likely on sale. I believe they used to sell RF and Kicker 6.5s. Crutchfield operators are really cool to talk with so no need to feel like you even have to get anything if you don't want to, they're happy to help.