EQ Settings for 2xDR200 + 2xT39

[David Carter]

As some of you know, I've recently built a pair of 20" T39's with 3012LF drivers, and I'm currently working on four DR200's with Delta Pro 8B (16ohm) drivers and melded arrays. When I'm finished, this will give me 2xDR200 per side to go with the T39's.

I don't have any RTA gear, and I don't have the funds to acquire any in the near future, so what I've done in the past is use the published response curves for the cabs I'm using as a basis for setting up my 31-band EQ. I'd like to do the same with this rig, but I need some guidance to be able to get started.

First of all, for the DR200's... I found this chart, but what happens when I add a second cab? Is it a 3db increase? Also, does the shape of the curve flatten at all with two cabs instead of one? And what, if any, impact does the 16ohm driver have?



Next, the T39's... None of the published charts are specifically for a 20" T39 with the 3012LF. Has anyone measured one like that? If not, what's the best way to get (or extrapolate) the data?

Thanks in advance...

[David Carter]

No thoughts?

[thijs666]

... what happens when I add a second cab? Is it a 3db increase? Also, does the shape of the curve flatten at all with two cabs instead of one?

My experience is that the response flattens a bit, but there's quite a boost in the section below +/-300Hz. I made the mistake once setting the DCX2496 in my '2 DR200's per side'-preset while I had only 1 DR per side. It made the sound very 'bodyless'. That 2nd DR DEFINATELY add some meat .

As for the balance of your set: I hope the T39's keep up. I have 2 T48's (21" wide, 3015LF loaded) and outside 4 DR200's almost outrun the T48's, especially with bass heavy music. Inside (and corner loaded) the balance is better.

[SoundInMotionDJ]

[My experience is that the response flattens a bit, but there's quite a boost in the section below +/-300Hz. I made the mistake once setting the DCX2496 in my '2 DR200's per side'-preset while I had only 1 DR per side. It made the sound very 'bodyless'. That 2nd DR DEFINATELY add some meat .

+100

The DR curve flattens a lot when you add a second cabinet. At some point there was a graph that showed 1, 2, and 4 DR's stacked. I can not find it right now. Here are two graphs, that show the difference between one DR250 and two DR250's - notice how the overall shape of the curve flattens. The most noticeable effect is in the midrange - as thijs666 described.





--Stan Graves

[David Carter]

I definitely don't have the funds to purchase a hardware RTA solution like the DEQ2496 right now. However, the thought occurs to me that if I could at least get a mic like the Behringer ECM8000, perhaps I could find a free software solution for doing some basic RTA work to get my rig set up.

Are there any free software applications anyone knows of that will allow me to do this? I don't think the free version of TrueRTA has enough resolution to be useful (1/1 octave)? How about something like RoomEQ Wizard? Any others? I'm completely new to the world of audio measurement--never done it before.

[Chris_Allen]

My second set of 200's are nearly finished, so I'll be able to run a full RTA.

[David Carter]

My second set of 200's are nearly finished, so I'll be able to run a full RTA.

That would be awesome! Do you by any chance have a DCX? I'm very interested in trying to set the system flat using the parametrics in the DCX and then use my graphic EQ for venue adjustments.

What subs are you using with the DR200's?

[Chris_Allen]

I have the DEQ2496 and the DCX.

Subs are the 15" BP102 T39's.

[David Carter]

I guess I'll still need to figure out the subs on my own then, but it would be great to see your RTA results for the DR200's. Are you using the Delta Pro 8 driver?

I don't know if you use the DCX parametrics or not, but if so, let me know how you end up setting them for your DR200's.

Thanks!

[David Carter]

My question still stands about freeware RTA software. If there's a decent one out there, it would be nice to know about it...

[Vuja de]

My question still stands about freeware RTA software. If there's a decent one out there, it would be nice to know about it...

I haven't used it yet but, it's free for 30 days and you might be able to get around the German.

[David Carter]

My question still stands about freeware RTA software. If there's a decent one out there, it would be nice to know about it...

I haven't used it yet but, it's free for 30 days and you might be able to get around the German.

Did you mean to include a name or a link?

[gdougherty]

I run SAC and use MAnalyzer with the Psychoacoustic response enabled. MAnalyzer is a VST plugin so any standalone VST host would allow you to utilize it on its own. SineGen is my pink noise generator. All you need then is a measurement mic and an audio interface to get the mic into the VST host. The psychoacoustic response applies an equal loudness curve to the input and IMO makes my OT12's sound much smoother and takes the harsh ranges out of the piezos. EQ'd flat they have a crisp bite to them that's very noticable.

[Bill Fitzmaurice]

.

Are there any free software applications anyone knows of that will allow me to do this? .

http://www.allen-heath.com/rta2/

[Vuja de]

My question still stands about freeware RTA software. If there's a decent one out there, it would be nice to know about it...

I haven't used it yet but, it's free for 30 days and you might be able to get around the German.

Did you mean to include a name or a link?

Oops
http://www.esseraudio.com/real-time-aud ... -audio.htm