DR200 port tuning question

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SethRocksYou
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DR200 port tuning question

#1 Post by SethRocksYou » Thu Aug 02, 2018 6:28 pm

Is there any undesirable side effect if the bottom DR200 (melded array) in a stack of 4 is tuned for more extension than the rest of the stack?

Bruce Weldy
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Re: DR200 port tuning question

#2 Post by Bruce Weldy » Thu Aug 02, 2018 6:32 pm

SethRocksYou wrote:
Thu Aug 02, 2018 6:28 pm
Is there any undesirable side effect if the bottom DR200 (melded array) in a stack of 4 is tuned for more extension than the rest of the stack?
If those same frequencies are being handled by the subs, then yes.

What is the situation where you'd want to?

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Re: DR200 port tuning question

#3 Post by SethRocksYou » Thu Aug 02, 2018 6:56 pm

Bruce Weldy wrote:
Thu Aug 02, 2018 6:32 pm

If those same frequencies are being handled by the subs, then yes.

What is the situation where you'd want to?
The planned build of 8 is for a specific annual event. It just popped in my mind that building 2 with the 4" port and the rest with the 1/4" port would give me one pair that could be used at small gigs without a sub.

I'd think the frequencies covered by the subs would be filtered from the tops when using subs. Using the chart in the plans, the difference would be about 5dB @ 100hz and 1 or 2 dB at 125hz. No difference at 135hz. So just a little window of frequencies effected.

Thoughts are to utilize power shading. Maybe EQ the bottom separately?

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Re: DR200 port tuning question

#4 Post by Bruce Weldy » Thu Aug 02, 2018 7:09 pm

SethRocksYou wrote:
Thu Aug 02, 2018 6:56 pm
Bruce Weldy wrote:
Thu Aug 02, 2018 6:32 pm

If those same frequencies are being handled by the subs, then yes.

What is the situation where you'd want to?
The planned build of 8 is for a specific annual event. It just popped in my mind that building 2 with the 4" port and the rest with the 1/4" port would give me one pair that could be used at small gigs without a sub.

I'd think the frequencies covered by the subs would be filtered from the tops when using subs. Using the chart in the plans, the difference would be about 5dB @ 100hz and 1 or 2 dB at 125hz. No difference at 135hz. So just a little window of frequencies effected.

Thoughts are to utilize power shading. Maybe EQ the bottom separately?
when you said "tuned", I figured you meant with your speaker processor. Just having a different tuning with the ports shouldn't be a problem as your crossover point will most likely be right at or above the lower port frequency.....

But, I can't imagine playing any gig with just two DR200 as your full range PA unless you are just running vocals through 'em.

6 - T39 4-25" 2-22" 3012LF
4 - OT12 2512 Melded/NSD2005
1 - T24
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Re: DR200 port tuning question

#5 Post by SethRocksYou » Thu Aug 02, 2018 10:30 pm

That's a good point Bruce. Any small gig would be solo singer, 12 string guitar, and not need all that much volume. I think the 1/4" port and an 80hz high pass would be just fine for that. So, I guess it's of no concern after all. Thanks for the quick responses and conversation Bruce. Much appreciated.

-Seth-

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Tom Smit
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Re: DR200 port tuning question

#6 Post by Tom Smit » Thu Aug 02, 2018 10:49 pm

You can make them convertible very easily by utilizing a 4" pipe.
TomS

Grant Bunter
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Re: DR200 port tuning question

#7 Post by Grant Bunter » Fri Aug 03, 2018 3:50 pm

Tom Smit wrote:
Thu Aug 02, 2018 10:49 pm
You can make them convertible very easily by utilizing a 4" pipe.
... which will lower tuning to say 50Hz, but also drop power handling by about 50 percent...
Built:
DR 250: x 2 (melded array) with March 2012 plans. 2 more under way with CD horn
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
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BrentEvans
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Re: DR200 port tuning question

#8 Post by BrentEvans » Fri Aug 03, 2018 9:22 pm

I had a pair with the convertible port. I never used the port extensions beyond playing with them a time or two. You can accomplish the same thing by boosting the bass EQ a bit. For vocals and 12 string guitar, you should be fine with the standard config. If you need more than what EQ can give you, you probably need a sub.
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