Help! What to do about this huge DIP?! 1khz-3khz

[phunk2]

Ok, I'm working on fixing my new mixplace. I ran a couple of tests and noticed this huge dip at 1kHz to 3kHz. How should I fix this? Got the basstraps and the cloud and gonna get a couple more traps fo fix the 150-250Hz bump. But I'm not really sure how to fix that super dip at 1-3kHz? Help me out!

Also if you see something else that I should be worried about so get at me. Need to fix this place now!

[SAC]

If you can, remove the smoothing! It simply obscures what is actually happening.

Also, provide a 0 - ~400 Hz waterfall plot. if possible.
(The various measurements should be with one speaker driven at a time - leaving the mic in the same position for ALL measurements)

Also, you need to provide pictures and dimensions relative to placement of the speakers, etc., as nothing that can be addressed happens in a vacuum.

The 200 Hz 'bump' could be SBIR or modal (or both).

Likewise, the 700-2kHz dip could be smoothed distributed comb filter caused effects - from room reflections, crossover/driver alignment issues, etc. etc....its hard to tell with so little detail.

The anomaly greater than ~700 Hz may also require ETC responses ( make impulse responses and then convolve to the ETC) for each speaker to see what reflections may be causing or contributing the cancellation.

[tINY]

At 1.3k, you are looking at a problem with a difference of about a half of a foot (15cm). Did you run this test driving both speakers? Or maybe you have a desk in front of your speaker....



-tINY

[phunk2]

Thanks for great feedback. I'll have to do some new mesurements when my new monitors and stands get here. And I'll try to get more specifics. I'm all new to this mesuring thingie. So I thought you could tell more from a simple graph, but I'll get to it!

I ran only one speaker, but there is a desk I better fix the last things first, early reflections and the front wall, before getting everything tested again. But I'll be reporting back soon and will be needing some help then for the last adjustments.

All the best!
/Confused Measuring Dude

[Ethan Winer]

Originally Posted by phunk2

I ran a couple of tests and noticed this huge dip at 1kHz to 3kHz.

What speakers are you using? The first thing I'd do is measure again with the microphone very close to the speaker, just to be sure it's not at least partly due to the speaker's own response.

--Ethan

[tINY]

Originally Posted by Ethan Winer

What speakers are you using? The first thing I'd do is measure again with the microphone very close to the speaker, just to be sure it's not at least partly due to the speaker's own response.

--Ethan

Close to the speaker and far from any other surfaces. Laying the speaker on it's back in the middle of the floor and putting the mic 15-30cm above it will usually give you reasonable results for the mid-range and HF of your speaker.



-tINY

[phunk2]

Thanks for the tip, I'll be getting a new set of speakers (Focal CMS 65) this week, I will burn them in and then try this and some new measurements.

[phunk2]

Here are some new measurements, with my Focal CMS 65s. Only had the Rode Nt1a mic. I hope you can tell some more from this, Laid down 15 CM from the speakers, incl. a waterfall just in case. And then theres the Speakers on my desktop incl. waterfall 0-400Hz. The room is about 8meters x 4,5m. With a leaning roof from 1m and tops at around 4,2meters. So it's kinda tricky. I will make the last measurements when i recieve my new Towersonic monitorstands next week. Hopefully they will help and serve their purpose. I'm guess the dip might be cause of the desktop and it's reflections, but I don't know.

Monitors laiddown:



New measurements:

[Yiannis]

NT 1A has a cardioid pattern.You need an Omni for the measurements.

[tonio]

+1 , get a SD omni mic... Behinger or Audix TR40.
your graphs shows typical response for 15cm distance from speaker.

use both speakers in normal mix setting and run them together in mono, with the mic at the listening position.

set the waterfall to abut 300-400 ms in time and about -60~-70 db amplitude from 20-500hz


you should be concerned about the low end 1st.

[phunk2]

Damn, I could almost have guessed that. Well I'll have the omni in 2 weeks. So I just have to wait even more then Hate this measurement stuff. I thought I knew some, but turns out im not that brilliant in this particular area since I never had to do this myself before.

[phunk2]

Originally Posted by tonio

+1 , get a SD omni mic... Behinger or Audix TR40.
your graphs shows typical response for 15cm distance from speaker.

use both speakers in normal mix setting and run them together in mono, with the mic at the listening position.

set the waterfall to abut 300-400 ms in time and about -60~-70 db amplitude from 20-500hz

Thanks alot, will do!

[tonio]

George Duke rules !!

T

[phunk2]

Originally Posted by tonio

George Duke rules !!

T

he sure does. and he's one cool cat at that pic