Behind the wall rss390-hf ported or 4th order - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 48 Old 01-18-17, 02:14 PM
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Re: Behind the wall rss390-hf ported or 4th order

I have to force mine too , i usually just log off. It looks like you have a good plan .
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post #22 of 48 Old 01-19-17, 05:52 AM
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Re: Behind the wall rss390-hf ported or 4th order

So your going to seal this sub to your exterior wall and then just have a vent covering it up?

How deep is the vent?

You also need to make sure it is sealed properly or it will rattle a LOT. Also dont want too big of a depth on your speaker's cone and vent because then your loosely building a 6th order design. Not a big deal but just let it be known is all.

"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 #23 of 48 Old 01-19-17, 08:14 AM Thread Starter
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Re: Behind the wall rss390-hf ported or 4th order

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chrapladm wrote: View Post
So your going to seal this sub to your exterior wall and then just have a vent covering it up?

How deep is the vent?

You also need to make sure it is sealed properly or it will rattle a LOT. Also dont want too big of a depth on your speaker's cone and vent because then your loosely building a 6th order design. Not a big deal but just let it be known is all.
The vents Ive looked at are just 1/2" cold air return covers. Designed to just cut the drywall out and stick in. Their will definitely be some work involved securing it to the wall and not rattling. The speaker cone will be 4" from the vent (the thickness of the wall).

Right now Im trying to model it with round ports so I can use nice flared aeroports. I think I can manage 2 4" ports, 23 m/s peak velocity at 17hz. I think thats within range? Going to check box volume again and re-model with 2 round ports in sketchup. Looks good in winisd.

-Colton
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Last edited by Drifte; 01-19-17 at 09:38 AM.
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post #24 of 48 Old 01-19-17, 10:35 AM Thread Starter
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Re: Behind the wall rss390-hf ported or 4th order

Im actually seeing nice output with a 23hz tune, it keeps excursion down, but at 20hz (109db) its down almost 4db. However it has nice a nice gain at everything about that idk..its definitely not flat. Port velocity is in the 30 m/s range.




Notes for my own reference:

19hz tuning reduces cone excursion at 27hz (the peak excursion frequency) 15mm (peak measuring 14mm, claimed 16m capable)

19hz tune 111db at 20hz
18hz tune 110.7db at 20hz

19hz tune down 2.7db at 20hz
18hz tune down 3db at 20hz (16mm excursion around 27hz)

With these findings I started looking at a 20hz tune. Not much is lost or gained but port velocity is up and excursion and output remain similar to 19hz.

17hz tune port velocity is way down 16.8 m/s @ 20hz, excursion is back up though to 16mm

-Colton
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post #25 of 48 Old 01-20-17, 10:29 AM Thread Starter
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Re: Behind the wall rss390-hf ported or 4th order

Before I finalize anything, Im wondering if I should put feet on the bottom of the box or just lay it flat on the floor? Idk which would be better in this situation.

-Colton
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post #26 of 48 Old 01-22-17, 11:05 AM Thread Starter
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Re: Behind the wall rss390-hf ported or 4th order

Progress on the box. Im trying to decide now if I should make a large brace in the middle, or dowel brace the box. This is the largest box Ive built without using MDF, so its a little different to me. Front baffle when finished will have a second layer of 1/2" oak hopefully making it more sturdy.

10.5cf, still undecided on the ports and tuning but getting there.




-Colton
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post #27 of 48 Old 01-22-17, 06:02 PM
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Re: Behind the wall rss390-hf ported or 4th order

As long as you have ample bracing you should be fine. Window, dowels or waffle style is fine. Just make sure to brace well is all. The more inert the cabinet the less the cabinet will move or vibrate against the wall.

"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 #28 of 48 Old 01-23-17, 09:07 AM Thread Starter
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Re: Behind the wall rss390-hf ported or 4th order

19hz model results:








Taking any advice I can get on choosing the tuning frequency.

-Colton
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post #29 of 48 Old 01-23-17, 12:34 PM
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Re: Behind the wall rss390-hf ported or 4th order

I believe you are in the best box size and tuning range . Have you decided on a bracing pattern ?
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post #30 of 48 Old 01-23-17, 12:59 PM Thread Starter
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Re: Behind the wall rss390-hf ported or 4th order

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I believe you are in the best box size and tuning range . Have you decided on a bracing pattern ?
I have not. If it was a regular box arrangement it would already be braced and done. But Im building the box at my dads wood shop rather than my garage. So I had to stop and come back and double check the placement inline with the wall studs.


dowels work, but i prefer the look and overall contact a full cutout brace can create.

-Colton
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