Short impulse! - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 20 Old 07-07-16, 06:38 PM Thread Starter
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Short impulse!

Hey,

When i make a measure, my impulse response time are very short. The impulse response ends after approximately 2msec. Its hard to find the first reflex when, if i want to make a gated measurement.

Does anyone have any suggestions?

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post #2 of 20 Old 07-08-16, 04:55 AM Thread Starter
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Re: Short impulse!

Hi,

Give you guys a link to show what I mean;



http://i817.photobucket.com/albums/z...psppha1lnl.jpg

Hoping for some ideas, thx.
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post #3 of 20 Old 07-08-16, 10:00 AM
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Re: Short impulse!

Check the Impulse chart legend and see if the first (measurement) box was active and not the 'windowed' box.

Have you reviewed the REW help for the impulse graph?

No Joy?:
If you pad 3 more posts to get to 5, then you can post your .mdat file in this thread. From that I can take a look to see if there is any obvious problems.
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post #4 of 20 Old 07-08-16, 10:25 AM Thread Starter
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Re: Short impulse!

Oh, thx for your reply. I am going nuts here

Yes, in have reviwed the tutorial, a couple of times.


"Check the Impulse chart legend and see if the first (measurement) box was active and not the 'windowed' box."
Hmm, exactly which box are you mention?

I really appreciate your help
(Sry for my English)

Regards
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post #5 of 20 Old 07-08-16, 10:36 AM Thread Starter
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Re: Short impulse!

...
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post #6 of 20 Old 07-08-16, 12:30 PM
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Re: Short impulse!

Legend as per red circled.

Short impulse!-impulse.png
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post #7 of 20 Old 07-08-16, 12:35 PM
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Re: Short impulse!

The time units on that graph you posted are seconds, not milliseconds, the response extends to about 1.7 seconds.
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post #8 of 20 Old 07-10-16, 05:04 AM Thread Starter
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Re: Short impulse!

Thx for your replies!

Yes, i noticed that it was 1,7s.
When iam zooming in i dont think that i see something that looks like the first reflex. The first reflex should be about 5ms.
The measure is a tweeter around 90cm in distance.
Whould be great if you could see if something is wrong.

Thx again!
Attached Files TweeterAt90cm.mdat (2.07 MB) 
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post #9 of 20 Old 07-10-16, 07:12 AM
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Re: Short impulse!

There are reflections at about 0.55ms, 1ms and 3.8ms. The 3.8ms is the most significant, but they are all quite low level, as you would expect from a measurement that is fairly close to the tweeter. They are easier to see if you select the Envelope trace.
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post #10 of 20 Old 07-10-16, 07:25 AM Thread Starter
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Re: Short impulse!

Thanks for that you take your time to help me.

Do you have any possibility to take a screenshot to show me how you see the reflection. Maybe I have the wrong boxes active or closed.
I have etc and the main window boxed.
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