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Author Topic: Lab Sub driver module and LF extension vs Versions 1-2-3  (Read 5770 times)

Too Tall (Curtis H. List)

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Re: What benefits come from rear chamber "tuning"
« Reply #10 on: December 14, 2004, 10:18:09 am »

Brad Litz wrote on Sun, 12 December 2004 20:02

Here is my measurement of v3.0 with no filters.
Two cabinets outdoors (no horn extension).

index.php/fa/829/0/



Hi Brad,

Supposedly I have someone bringing over some version 3 LAB subs for testing. Do you happen to have an impedance measurement of a v3 without the flare extension?

Otherwise next best would be the prediction from modeling program. I want something for a base line so I can tell the owner it is working correctly or not.
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Too Tall
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Too Tall (Curtis H. List)

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Re: What benefits come from rear chamber "tuning"
« Reply #11 on: December 14, 2004, 10:31:28 am »


Stevesb65 wrote on Sun, 12 December 2004 19:30

Brad, Mark, Tom, and anyone else:

snip-

As for the dip in the 45 Hz range, how evident is it, and would it be "fixable" with a good eq or at the BSS minidrive?

Thanks

Steve Shafer



Look at the graph in the next post by Brad.

The blue line labeled "2" is the response with a typical 24dB/octave Link-Riley low pass xover and a single parametric filter that you could find in just about any digital speaker management device like DBX Driverack, XTA, BSS or even Behringer.

   The result of the filter is that instead of a peak at 90Hz and a dip around 45hz (magenta line of raw frequency response) you now have a peak at 35hz and flat response above it.

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Too Tall
        Curtis H. List    
             Bridgeport, Mich.   
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Brad Litz

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Re: What benefits come from rear chamber "tuning"
« Reply #12 on: December 15, 2004, 12:23:12 am »

Here's the predicted response. Sorry, I did not measure it.

index.php/fa/839/0/
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Brad Litz

Too Tall (Curtis H. List)

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Re: What benefits come from rear chamber "tuning"
« Reply #13 on: December 15, 2004, 09:46:13 am »

Brad Litz wrote on Wed, 15 December 2004 00:23

Here's the predicted response. Sorry, I did not measure it.

index.php/fa/839/0/





OK thanks.

If the modeling program can export this graph as a text file (three columns of freq, magnitude and phase angle) then I would like that too.
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Too Tall
        Curtis H. List    
             Bridgeport, Mich.   
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Brad Litz

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v3.0 Data File
« Reply #14 on: December 15, 2004, 06:42:55 pm »

Here is a data file assuming the two drivers in a cabinet are wired in parallel and 2.75 volts applied. The data is for 1 cabinet in 1/8 space, 2 in 1/4 space, 4 in 1/2 space, or 8 flown (no horn extension).
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Brad Litz

Too Tall (Curtis H. List)

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Re: v3.0 Data File
« Reply #15 on: December 16, 2004, 09:46:56 am »

Brad Litz wrote on Wed, 15 December 2004 18:42

Here is a data file assuming the two drivers in a cabinet are wired in parallel and 2.75 volts applied. The data is for 1 cabinet in 1/8 speace, 2 in 1/4 space, 4 in 1/2 space, or 8 flown (no horn extension).



Thanks Brad,
Too Tall
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Too Tall
        Curtis H. List    
             Bridgeport, Mich.   
        I.A.T.S.E. Local # 274 (Gold Card)
        Lansing, Mich
Independent Live Sound Engineer (and I'm Tall Too!)
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