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Tuning options DR200's

Posted: Tue Dec 15, 2020 1:03 am
by Paddlsonic
Just a DR200 build questions.

I'm building 2 x tuba30's and 2xDR200's. Keeping a 1:1 ratio.
i have searched the forum for info on the tuning options on the DR200's. In particular the port sizes.

Assuming i want to crossover below 135hz (someone can tell me where the sweet spot is between the DR's and the Tuba), i'll be using the 2"x1/4" option.
I'm a bit confused.
on page 19 it mentions "The hole diameter depends on your duct configuration, which is covered later in the plans (Tuning Options)"
but by page 35 it says "Make the ducts from 2” ID Schedule 40 PVC pipe."

my first interpretation was that it was going to be a 1/4" duct 2" long but from later now i'm thinking it's a 2"duct 1/4"long.

I know it's probably plain but for some reason my head is not letting it be.

Any thoughts on that (not my head)..........

Cheers

Re: Tuning options DR200's

Posted: Tue Dec 15, 2020 1:16 am
by Seth
Paddlsonic wrote: Tue Dec 15, 2020 1:03 am Just a DR200 build questions.

I'm building 2 x tuba30's and 2xDR200's. Keeping a 1:1 ratio.
i have searched the forum for info on the tuning options on the DR200's. In particular the port sizes.

Assuming i want to crossover below 135hz (someone can tell me where the sweet spot is between the DR's and the Tuba), i'll be using the 2"x1/4" option.
I'm a bit confused.
on page 19 it mentions "The hole diameter depends on your duct configuration, which is covered later in the plans (Tuning Options)"
but by page 35 it says "Make the ducts from 2” ID Schedule 40 PVC pipe."

my first interpretation was that it was going to be a 1/4" duct 2" long but from later now i'm thinking it's a 2"duct 1/4"long.

I know it's probably plain but for some reason my head is not letting it be.

Any thoughts on that (not my head)..........

Cheers
What is your question?

Re: Tuning options DR200's

Posted: Tue Dec 15, 2020 1:25 am
by Strange Kevin
The port width is always 2 inches. (2" PVC) the length of the pipe is what changes. (Longer = lower tuning)

I'd go with the 2"×1/4" for the 80Hz tuning especially since you have subs.

Generally speaking 100-120Hz is a good Crossover point to start with the DR200s.

Re: Tuning options DR200's

Posted: Tue Dec 15, 2020 1:32 am
by Seth
And the hole diameter depending on your duct configuration refers to whether you choose to have interchangeable ducts or not. Drill 2 3/8" holes if you don't want interchangeable ducts, or 2 3/4" inch holes if you choose to go the interchangeable route.

Re: Tuning options DR200's

Posted: Tue Dec 15, 2020 8:08 am
by Bill Fitzmaurice
Paddlsonic wrote: Tue Dec 15, 2020 1:03 am but by page 35 it says "Make the ducts from 2” ID Schedule 40 PVC pipe."
ID = Inside Diameter.

Re: Tuning options DR200's

Posted: Wed Dec 16, 2020 6:24 am
by Paddlsonic
Thanks guys, yep that clears up the dimensions.
At 1/4" is the port centred on the ply skin (so sticks out approx.1mm either side) or flush on the exterior projecting inside?

Re: Tuning options DR200's

Posted: Wed Dec 16, 2020 7:50 am
by Bill Fitzmaurice
It doesn't matter.

Re: Tuning options DR200's

Posted: Thu Dec 17, 2020 6:37 pm
by Paddlsonic
Thanks Bill.