Did I do it right? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 17 Old 12-30-09, 04:46 PM Thread Starter
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Did I do it right?

This is a measurement of my Salk Songtowers using the Radioshack analog SPL meter. Other than the FR rolling off quicker than I had hoped, and a couple bad dips, does it look like I set it up and ran it correctly? I set both the SPL meter and REW as C weighted and Slow, correct? Using the radioshack calibration file and calibrated my SC (Creative X-FI).

This is just the starter file for before I add a sub and room treatments. Want to make sure I have it working correctly to get a good base case measurement.

Did I do it right?-1st-measurement.jpg


Thanks!
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post #2 of 17 Old 12-30-09, 04:51 PM
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Re: Did I do it right?

That looks about right. Have you tried measuring in a different position to see if the response changes?

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post #3 of 17 Old 12-30-09, 05:03 PM Thread Starter
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Re: Did I do it right?

Great, thanks for the quick response!

No, I haven't tried anything yet, just got it set up, took a while!
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post #4 of 17 Old 12-31-09, 12:31 PM
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Re: Did I do it right?

Yep. That looks like you've got things working. If it's an option try moving the speakers or the listening position a little. It can make a big difference.
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post #5 of 17 Old 12-31-09, 01:16 PM Thread Starter
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Re: Did I do it right?

Here is my first attempt and tweaking speaker placement. I moved everything approximately 1' back towards the front wall. Looks like it improved the low end quite a bit, but increased the null at ~300Hz. I still need to check how this affected imaging and notice of reflections since I thought both were very good at the previous location.

Green line is the new measurement compared to my one from yesterday. Is there a way to do the compare graph with the target line?

Did I do it right?-2nd-measurement.jpg
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post #6 of 17 Old 12-31-09, 01:24 PM
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Re: Did I do it right?

Quote:
Stylus wrote: View Post
Here is my first attempt and tweaking speaker placement. I moved everything approximately 1' back towards the front wall. Looks like it improved the low end quite a bit, but increased the null at ~300Hz. I still need to check how this affected imaging and notice of reflections since I thought both were very good at the previous location.

Green line is the new measurement compared to my one from yesterday. Is there a way to do the compare graph with the target line?

Attachment 18324
I suggest you get the placements set and then work on the big dips. That should be enough to give you good sound.
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post #7 of 17 Old 12-31-09, 02:32 PM
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Re: Did I do it right?

Quote:
Stylus wrote: View Post
This is a measurement of my Salk Songtowers using the Radioshack analog SPL meter. Other than the FR rolling off quicker than I had hoped, and a couple bad dips, does it look like I set it up and ran it correctly? I set both the SPL meter and REW as C weighted and Slow, correct? Using the radioshack calibration file and calibrated my SC (Creative X-FI).

This is just the starter file for before I add a sub and room treatments. Want to make sure I have it working correctly to get a good base case measurement.

Attachment 18315


Thanks!
Hi Stylus, I've just got the Creative X-FI sound card too. I'm just curious as how you calibrated your sound card. For me, I have to crank up the volume of the input and output really high in order to calibrate it. Can you post the setting of how you did it on yours?

Thanks,

Al,
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post #8 of 17 Old 12-31-09, 02:48 PM Thread Starter
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Re: Did I do it right?

Here you go...

Did I do it right?-rew-settings1.jpg

Did I do it right?-rew-settings2.jpg

Last edited by Stylus; 12-31-09 at 06:35 PM.
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post #9 of 17 Old 12-31-09, 03:19 PM Thread Starter
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Re: Did I do it right?

Can someone explain what I am looking at here. I have no idea how to read these or what they are telling me.

Thanks!

Did I do it right?-1st-waterfall.jpg
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post #10 of 17 Old 12-31-09, 09:07 PM
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Re: Did I do it right?

Your graph would be easier to read and interpret if you had followed the advice to use a logarithmic scale rather than a linear scale for the frequency axis. You change the scale by pushing the Freq Axis button at the upper right. As it happens, there is a bug that the frequency axis of the waterfall chart gets truncated on the right when the scale is linear.

To understand what you might be seeing, you could try reading the thread on waterfall charts. In your chart, you seem to have a lot of frequencies that decay beyond 300ms. It may be easier to see what is important when you display it with a log scale, but increasing the time scale a little, to say 500ms, might also help show what is really happening.

Bill
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