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  Topic Review (Newest First)
04-16-19 10:48 AM
BP1Fanatic
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

Awesome build!
02-12-19 11:52 AM
theJman
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

It's obvious you put a lot of time and thought into this system. Hopefully it does everything you expected it would.
02-11-19 05:58 PM
Will P
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

The corner of the room is the stiffest area of the floor. Besides that the EQ needed for floor shaker given the floor structure and resonances and the EQ needed for the Subs would be different and impossible to get equal response.
That's why I decided to: 1. Cancel out all subwoofer drivers vibrations by opposing them in pairs; 2. Decouple the subwoofer boxes from the house framing so no direct sound gets transferred to the walls, floor and nearby rooms.
The sound effect is generated by the subwoofers pressure alone. After certain sound level you start feeling it in the floor. Whenever a massive flying object in the movie hits the ground it feels like it landed right in front of you.
Again it's a main floor room with basement floor below and although I doubled up all the floor joists to make it stiffer the floor is still responsive.
02-09-19 01:10 AM
Donny Bahama Brilliant concept and fantastic execution! I’m a big proponent of putting tactile transducers in seating risers, so when I saw the title, I had to know the whole story. I’m curious- you seem to have gone to a lot of trouble to decouple these from the floor; did you consider letting them do some “bass shaking”? Or is that a natural side effect even with all the decoupling?

Kudos on a VERY cool idea!
02-07-19 11:09 AM
Will P
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

You can wire them based on you amp power and amp speaker Zmin.
I wired them for 8ohm : (2) parallel groups, each group consist of (4) in series.
02-07-19 10:50 AM
jkline
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

Thanks for sharing!

Last question, how are the 8 drivers wired? Series/parallel or some combination?
02-06-19 08:48 PM
Will P
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

The subwoofer port is 10" cavity at the end of the subwoofer with grill mounted on top
02-06-19 08:46 PM
Will P
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

Here are the in-floor subwoofer design drawings..
I'm using Crown XLS 2500 to power both subs. You can use Crown XLS 1500 too. Plenty of power to drive them both to Xmax.
The combined cone surface per sub equals 21" sub. The excursion is 8mm only though. Displacement equals 15" sub each subwoofer box.
02-06-19 07:06 PM
jkline
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

Very cool!

Couple of questions:
1. Do you have more detail on the business end of the box? Specifically the port that feeds into the room.
2. What are using to power these?
3. Do you have any drawings of this?

I have seen some other applications of under floor band-pass subs, but yours is pretty elaborate and well made.
02-05-19 07:53 AM
theJman
Re: In-floor subwoofers - 8x8" drivers each, highest WAF factor

That was a very innovative and remarkably well executed solution you created. Impressive work!
This thread has more than 10 replies. Click here to review the whole thread.

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