Velodyne SMS-1 Mic ? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 17 Old 03-08-12, 03:01 PM Thread Starter
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Re: Velodyne SMS-1 Mic ?

Quote:
Wayne A. Pflughaupt wrote: View Post

You're an honorable guy not to want to pass this thing on to some other unsuspecting soul, Mike.

As tcario noted, the SMS-1 is supposed to be a better and more efficient and faster method than using test tones and the SPL meter, but you can get acceptable results using the meter and manual plotting response, as this fellow has. It was common practice before things like REW came along. The meterís response basically tracks the C-weighting curve. If I recall, the Excel workbook you can download in the BFD Guide has compensation for the meterís natural low-freq roll out built-in. If not, you just add the correct adjustment dB figure to the meterís display. Post some of those excel graphs and we'll be happy to help you determine the parametric filters you'll need to program into the SMS-1. We'll make this work.

Regards,
Wayne
Thanks, Wayne

I feel much better about this now, and feel more like I can make this work using the SMS 1. I'm waiting on an email from Velodyne to see what they have to say about the ECM8000 mic. Either way I'm going to pick up a ECM8000 mic and go for it.

I'll be back.

Thanks again,

Mike
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post #12 of 17 Old 03-08-12, 07:52 PM Thread Starter
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Re: Velodyne SMS-1 Mic ?

Here is what my sub looks like using the Excel Workbook for Radio Shack Model 33-2050 that I have.



Measurements from Radio Shack meter

20.0, 69
22.0, 67
25.0, 75
28.0, 79.5
31.5, 84
36.0, 88.5
40.0, 92.5
45.0, 86
50.0, 82
56.0, 79
63.0, 90
71.0, 88
80.0, 82
89.0, 75
100.0, 74
111.0, 57
125.0, 50
142.5, 50
160.0, 50

Last edited by mikejl46; 03-08-12 at 08:18 PM.
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post #13 of 17 Old 03-08-12, 09:17 PM
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Re: Velodyne SMS-1 Mic ?


What kind of sub is this? Thatís a pretty severe spike at 40 Hz; itís pushing the limits of what can be reasonably equalized (more on that topic here). Do you have any other placement options?

Regards,
Wayne



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post #14 of 17 Old 03-08-12, 09:49 PM Thread Starter
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Re: Velodyne SMS-1 Mic ?

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Wayne A. Pflughaupt wrote: View Post

What kind of sub is this? Thatís a pretty severe spike at 40 Hz; itís pushing the limits of what can be reasonably equalized (more on that topic here). Do you have any other placement options?

Regards,
Wayne
It's a Adire Rava sub. I have it back in a corner. I may be able to move it to one other location.

I was messing around with REW and imported the Freq readings from the radio shack meter.

Would these setting work to flatten it out some, or doesn't it work that way.


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post #15 of 17 Old 03-09-12, 10:03 AM
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Re: Velodyne SMS-1 Mic ?


Quote:
mikejl46 wrote: View Post
Would these setting work to flatten it out some, or doesn't it work that way.
Sure, that would be a good place to start.

Regards,
Wayne



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post #16 of 17 Old 03-09-12, 04:54 PM Thread Starter
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Re: Velodyne SMS-1 Mic ?

Here is the email from Velodyne.


Hi Mike,

It does not matter if you have the original ECM8000 Behringer mic . It will work .

Jeff Davis
Product Support / Technical Assistance

Last edited by mikejl46; 03-09-12 at 06:58 PM.
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post #17 of 17 Old 03-15-12, 11:34 PM Thread Starter
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Re: Velodyne SMS-1 Mic ?

The SMS-1 worked out ok without the original mic. I was able to take down the high spots just fine.

Here is a graph of the before and after.



Thanks,

Mike
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