Tuning options DR200's

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Paddlsonic
Posts: 27
Joined: Mon Sep 07, 2020 8:54 pm
Location: Australia

Tuning options DR200's

#1 Post 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

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Seth
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Location: Sacramento, California, USA
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Re: Tuning options DR200's

#2 Post 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?
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Strange Kevin
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Joined: Fri May 19, 2017 3:02 pm
Location: Scottsdale AZ

Re: Tuning options DR200's

#3 Post 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.
Authorized Builder - Phoenix AZ.
Main Rig - 6 DR200s - 6 T48s (30")
SLA Pros for the smaller stuff.

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Seth
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Re: Tuning options DR200's

#4 Post 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.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Bill Fitzmaurice
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Re: Tuning options DR200's

#5 Post 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.

Paddlsonic
Posts: 27
Joined: Mon Sep 07, 2020 8:54 pm
Location: Australia

Re: Tuning options DR200's

#6 Post 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?

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Bill Fitzmaurice
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Re: Tuning options DR200's

#7 Post by Bill Fitzmaurice »

It doesn't matter.

Paddlsonic
Posts: 27
Joined: Mon Sep 07, 2020 8:54 pm
Location: Australia

Re: Tuning options DR200's

#8 Post by Paddlsonic »

Thanks Bill.

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