Enclosure help....

[tcarcio]

I just bought this sub,http://www.diycable.com/main/product_info.php?cPath=24_93_150&products_id=653 and I need to build a sealed enclosure that is 2.2cu.ft. Is there someone or somwhere I can get the plans to build it. I will be useing the EP2500 to power it.

 

[Adam]

I've been wondering - is this for home use or a vehicle?

 

[Alex2507]

I've been wondering - is this for home use or a vehicle?

Gotta be for home use as he is going to use a Behringer EP2500 amp.

 

[Adam]

Gotta be for home use as he is going to use a Behringer EP2500 amp.

Oops. Mental glitch.

 

[tcarcio]

Definitly for home use . I have one sealed sub already and want to build another. Actually I don't have alot of woodworking tools so I might have to get a shop in the area to do it. I have just been looking for plans for the box to see what it will take to do it. The site where I bought the sub recommended a 2.2cu.ft. box and I thought they had the plans available but I can not find them. If someone could point me to a site where I can get the plans or if someone here would have some suggestions I would appreciate the info. I am off to work now but will check back later......

 

[Alex2507]

Give this a read:
http://www.audioholics.com/tweaks/get-good-bass/subwoofer-connection-guide
I just want to point out that having twin subs is highly recommended. With mismatched subs you're rolling the dice.

 

[WmAx]

I just bought this sub,http://www.diycable.com/main/product_info.php?cPath=24_93_150&products_id=653 and I need to build a sealed enclosure that is 2.2cu.ft. Is there someone or somwhere I can get the plans to build it. I will be useing the EP2500 to power it.

You should also use a device like a Behringer DCX2496, not only for xover, but to shape the lower end response of the sealed box and get your ideal target response - it's not usually optimal to accept the natural sealed response curve. Using the EP2500 in mono bridged will give you plenty of power for significant EQ and that sub supposedly has a very substantial amount of excursion(which I wonder just how linear this movement is - this sub is unusually low in cost for these excursion specs - so I am naturally suspicious of it) which would make it very suitable to substantial EQ shaping.

-Chris

 

[tcarcio]

You should also use a device like a Behringer DCX2496, not only for xover, but to shape the lower end response of the sealed box and get your ideal target response - it's not usually optimal to accept the natural sealed response curve. Using the EP2500 in mono bridged will give you plenty of power for significant EQ and that sub supposedly has a very substantial amount of excursion(which I wonder just how linear this movement is - this sub is unusually low in cost for these excursion specs - so I am naturally suspicious of it) which would make it very suitable to substantial EQ shaping.

-Chris

Hi Chris, I have an sms1 that I use now so I should be fine. I have a sealed sub now and wanted to try 2 or if this one turns out to be better than the one I have then I will sell the other. The Shiva was recomended to me by a very respected person over at the home theater shack so I hope it is what I am looking for. If I can get this thing built I will let everyone know how it performs.

 

[tcarcio]

Give this a read:
http://www.audioholics.com/tweaks/get-good-bass/subwoofer-connection-guide
I just want to point out that having twin subs is highly recommended. With mismatched subs you're rolling the dice.

I was told exactly that at HTS but like I said in my other post if it doesn't work out I will sell one. Thanks for the link.........

 

[WmAx]

Hi Chris, I have an sms1 that I use now so I should be fine. I have a sealed sub now and wanted to try 2 or if this one turns out to be better than the one I have then I will sell the other. The Shiva was recomended to me by a very respected person over at the home theater shack so I hope it is what I am looking for. If I can get this thing built I will let everyone know how it performs.

Sell the SMS. The DCX is a far more powerful device. Ironically, it's also much cheaper.

-Chris

 

[tcarcio]

Sell the SMS. The DCX is a far more powerful device. Ironically, it's also much cheaper.

-Chris

I know what you mean but the SMS works very well for me and it is very user friendly. I called the company that makes the driver I just bought and the guy I talked to said he would email me the plans for the enclosure. Funny that no one here has built this enclosure, Oh well. He also told me that if I am going to run 2 subs to try stacking them. I thought if you stack them the top one would vibrate off so how do you stop that from happening besides connecting them.

 

[Alex2507]

Do you have any restrictions on any of the dimensions (L W H)? Establish two of them and it makes the 3rd a variable that you can adjust to accommodate bracing and damping volume. Damping volume is to be calculated as 5-10% of the actual volume from what I understand if this holds true for a sealed enclosure. I had never considered one before.

Buy some graph paper and start drawing or get see what the HTS member did for his. I imagine he would happily share info as you are going this route based on his success.

Edit: The idea is that with a good sub is that the only thing in the room not vibrating is the sub.

 

[tcarcio]

Do you have any restrictions on any of the dimensions (L W H)? Establish two of them and it makes the 3rd a variable that you can adjust to accommodate bracing and damping volume. Damping volume is to be calculated as 5-10% of the actual volume from what I understand if this holds true for a sealed enclosure. I had never considered one before.

Buy some graph paper and start drawing or get see what the HTS member did for his. I imagine he would happily share info as you are going this route based on his success.

Edit: The idea is that with a good sub is that the only thing in the room not vibrating is the sub.

Length and width are the only problems I would have but height would be no problem. I get what you mean about subs but they all vibrate to some degree although small it could cause the top one to move. I will find out anyway once I get the second one built. Thanks........

 

[gus6464]

Length and width are the only problems I would have but height would be no problem. I get what you mean about subs but they all vibrate to some degree although small it could cause the top one to move. I will find out anyway once I get the second one built. Thanks........

If height is no problem you should consider doing a passive radiator configuration with one exodus audio 15" or 12" PR.

 

[tcarcio]

If height is no problem you should consider doing a passive radiator configuration with one exodus audio 15" or 12" PR.

Exactly what does a passive radiator do and how much difference will it make? I see small subs like the sunfire's and earthquake's that have 2 drivers, is one of them passive?

 

[tcarcio]

This is the box I will build, pretty simple I just need to get the tools.http://ssomail.charter.net/do/mail/message/download?msgId=saved+e-mailDELIM1238&part=3&l=en-US&v=ssomail
http://ssomail.charter.net/do/mail/message/download?msgId=saved+e-mailDELIM1238&part=4&l=en-US&v=ssomail

 

[Alex2507]

The link isn't right.

 

[gus6464]

Exactly what does a passive radiator do and how much difference will it make? I see small subs like the sunfire's and earthquake's that have 2 drivers, is one of them passive?

http://en.wikipedia.org/wiki/Passive_radiator_(speaker)

Basically it allows you to tune a smaller enclosure to give the performance of a bigger vented one.

For example all of Def Tech's subs utilize passive radiators. This allows them to be smaller and still have good extension unlike a comparable sealed sub which will require a lot more power and heavy EQ to achieve the same performance.

What are your limitations as far as width and length?

 

[gus6464]

Here is the Shiva-X in a sealed enclosure and one with 2 passive radiators with 1600g mass on each. The box is the exact same dimensions for both.

Now the green curve is the one with the 2 passive radiators and the pink one is for the sealed enclosure. As you can see the the PR design gives you ~4dB more output at 20Hz than the sealed. But the most important thing to notice is cone excursion at that frequency. With the PR design the Shiva-X is not working as hard at 20Hz while with the sealed design it is almost at xmax. That means that the driver is working a lot harder in a sealed design to give you that output whereas in the PR design it still has room to go lower.

Box dimensions are 24"H x 14"L x 17"D with a 1.5" thick front baffle and .75" sides and rear.

The passive radiators are 2x of these http://aespeakers.com/shop/catalog/product_info.php?cPath=24&products_id=40

 

[tcarcio]

Thanks for the info Gus, I am limited at the moment by budget and don't have the extra to go with the passive. It makes me think I should wait until I can though.