10 cu ft!! Yikes - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 15 Old 01-07-16, 07:45 PM Thread Starter
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10 cu ft!! Yikes

I have been throwing around the idea of a DIY sub. I chose a fairly midrange sub and amp combo and a really nice guy at parts express helped me design the box. All nearly 10 cu ft of it! Is this because of my particular speaker choice. If it helps any, it is a Dayton RSS390HF-4. I would like to do ported because of its advantages but when reality sets in, that is just plain too big. I have a ported klipsh 12 that is tiny in comparison. So if I chose a better speaker, can I go considerably smaller with the same performance?
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post #2 of 15 Old 01-07-16, 09:17 PM
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Re: 10 cu ft!! Yikes

You don't necessarily need a "better" driver, just one with different TS parameters. How the driver is designed, with regards to its specifications, dictates what alignment it works best in, the size of enclosure required, amp power needed, etc. Perhaps if you told the PE rep what you're looking to achieve he might be able to suggest something different.

Another option would be a pre-designed kit, and PE sells those as well. DIY Sound Group has a bunch too, in both sealed and ported models.

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post #3 of 15 Old 01-07-16, 09:42 PM
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Re: 10 cu ft!! Yikes

Wait are you saying this is a sealed cabinet of 10cuft?

WOW if it is. Here are PE's examples:
Sealed Volume 2.88 ft. Sealed F3 37 Hz

Vented Volume 8.96 ft. Vented F3 21 Hz

SO not sure why you went so large.

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post #4 of 15 Old 01-07-16, 10:34 PM Thread Starter
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Re: 10 cu ft!! Yikes

Ported not sealed
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post #5 of 15 Old 01-07-16, 10:42 PM Thread Starter
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Re: 10 cu ft!! Yikes

Quote:
theJman wrote: View Post
You don't necessarily need a "better" driver, just one with different TS parameters. How the driver is designed, with regards to its specifications, dictates what alignment it works best in, the size of enclosure required, amp power needed, etc. Perhaps if you told the PE rep what you're looking to achieve he might be able to suggest something different.

Another option would be a pre-designed kit, and PE sells those as well. DIY Sound Group has a bunch too, in both sealed and ported models.
Thank you...will this work for the hf as well (it specifies the ho model) > http://www.diysoundgroup.com/cube15.html

This is much better size-wise and will be much easier to talk the wife into.

edit: looks like 4 cu ft with that sub will be -7db at 20hz

Last edited by DelSoto; 01-07-16 at 10:53 PM.
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post #6 of 15 Old 01-07-16, 11:06 PM
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Re: 10 cu ft!! Yikes

Why is -7db at 20hz bad?

Thats before EQ.

"Music is the space between the notes"
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post #7 of 15 Old 01-07-16, 11:31 PM Thread Starter
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Re: 10 cu ft!! Yikes

So that's manageable? That will work for me and it'll be an easy sell....lol
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post #8 of 15 Old 01-08-16, 12:56 AM
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Re: 10 cu ft!! Yikes

Yes F7 is fine for a sealed sub. My pair of 18's I have in sealed cabinets are about 45hz -7db. With EQ they sound awesome. Not ULF monsters but everything I wanted in a small sealed cabinet.

"Music is the space between the notes"
[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.
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post #9 of 15 Old 01-08-16, 01:31 AM Thread Starter
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Re: 10 cu ft!! Yikes

As I stated before.....these are going in a ported enclosure not sealed
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post #10 of 15 Old 01-08-16, 05:08 AM
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Re: 10 cu ft!! Yikes

In 4cuft what are you trying to tune the port to?

When using this driver it does like large volumes when porting. As Jman stated you just need a driver that likes small volumes. BUT when trying to port in a small cabinet with a 15" you will end up taking a LOT of room with the port size needed. So to keep air speed down in the port you will need a port size thats pretty big and because of the small volume used it will need to be a long port also. SO its a balancing act of how low you can tune.

Here is a design that would work for you. It has about a 18hz -7db point. It works with the 15 also.




The above image has the Dayton 390HO 15" 23hz tune 1100watts and it is the green line. As I just noticed you have the HF driver not HO. So this will not work. I figured I would leave this idea for you thought because maybe you can buy the Ho driver. If not just used the HF sealed.

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