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Old 16th March 2013, 04:58 PM   #11
epa is offline epa  Netherlands
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did a quick measurement today.
outside 1mtr with uncalibrated ecm8000.
it comes verry close to the sim,only the bottom end seems to fall of earlier.
maybe due to rising le and the mic a litle bit.
otoh it sounds pretty much that way.
no imp/distortion measurement yet,and also no ppsl measurements,no time for that.
Click the image to open in full size.
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Old 16th March 2013, 05:33 PM   #12
tb46 is offline tb46  United States
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Hi epa,

Looks good, any HP filter in this measurement?

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Old 16th March 2013, 06:11 PM   #13
epa is offline epa  Netherlands
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hi oliver
no filters.
maybe when the grill mesh stiffens the mouth,it might ad a lttle around 40.
to bad whe had only 2 hours today,i like to do some extencive tests
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Old 16th March 2013, 06:24 PM   #14
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Quote:
Originally Posted by epa View Post
hi oliver
no filters.
maybe when the grill mesh stiffens the mouth,it might ad a lttle around 40.
to bad whe had only 2 hours today,i like to do some extencive tests
Unfortunately stiffening cabinet walls generally improves upper output, not lower, and your design looks pretty stiff to start with.

You could try reducing the mouth size slightly, it will bring up the LF output, but reduce the upper output.
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Old 16th March 2013, 06:25 PM   #15
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Quote:
Originally Posted by epa View Post
did a quick measurement today.
outside 1mtr with uncalibrated ecm8000.
it comes verry close to the sim,only the bottom end seems to fall of earlier.
maybe due to rising le and the mic a litle bit.
otoh it sounds pretty much that way.
no imp/distortion measurement yet,and also no ppsl measurements,no time for that.
Click the image to open in full size.
Nice work Epa
The result is very close
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Old 16th March 2013, 07:01 PM   #16
epa is offline epa  Netherlands
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hi art
the mouth area is indeed to big.(and a bit flappy)
still to do is doubling the mouth ends thickness from about 20 cm from the end,then a few bracings to support the grill ,and the grill itself.
that all wil reduce the mouth by a bit.
but yes i wil try something to reduce to see what it does(maybe a keystone slot)

nice thing about the dsp program of the powersoft amp,is that i can import the mlssa data ,and correct it.

the min excursion point is around 39 hz,in the sim its 38...

tnx for the input.
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Old 16th March 2013, 07:04 PM   #17
epa is offline epa  Netherlands
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tnx kornny
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Old 16th March 2013, 09:30 PM   #18
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Quote:
Originally Posted by epa View Post
hi art
the mouth area is indeed to big.(and a bit flappy)
still to do is doubling the mouth ends thickness from about 20 cm from the end,then a few bracings to support the grill ,and the grill itself.
that all wil reduce the mouth by a bit.
but yes i wil try something to reduce to see what it does(maybe a keystone slot)

nice thing about the dsp program of the powersoft amp,is that i can import the mlssa data ,and correct it.

the min excursion point is around 39 hz,in the sim its 38...

tnx for the input.
The things you already plan to do will probably lower the excursion minima frequency by 1Hz.

A Keystone slot wouldn't work with your fold (as you knew), but it would be worth an experiment with an opening shape like this: ) (.
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Old 23rd March 2013, 09:48 AM   #19
epa is offline epa  Netherlands
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yesterday i took some more measurements,with different audio interface.
there was no difference between the one @ post 11 and this one.

it seems i have underestimated the mouth positsion in therms of loading.
measurments post 11 where taken vertical on a cart ,yellow line (raised 25db),
the blue line is vertical floor standing and the red line is horizontal on the floor.
the horizontal setup not only looks (and sounds) less peaky,it also puts out 4 db more.
Click the image to open in full size.

since whe wil be using it vertical,whe are going to design a box same size with a mouth at the bottom.

whe put some power on it,and found that excursion above ~16 to 20mm on kick drums,it wil sound"woppy"
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Old 23rd March 2013, 03:02 PM   #20
tb46 is offline tb46  United States
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Hi epa,

What was your measurement setup, have you done any 10m/100W measurements (like Danley)?

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