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Old 21st November 2010, 10:17 AM   #91
epa is online now epa  Netherlands
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in adition to what iand says,here is a comparisson between a real low d&b note and a ctual sine wave of 32 herz.
as you can see ,a lot more things are going on.Click the image to open in full size.
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Old 21st November 2010, 12:07 PM   #92
MaVo is offline MaVo  Germany
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Epa: In electronic dance music, the low bass, for example the kickdrum or rather its fundamental, is often used as a sidechain input for a compressor for the rest of the music (thats where the pumping effect comes from). Which means, that everything else is turned down when the bass hits, so that the bass is only about 3-6db lower than the theoretical maximum loudness. This isnt as extreme in normal pop music and there is little difference between dubstep, techno or electro and what else you can get. Bottom line: The type of music has quite the influence on how far you can turn up the volume.

Looking at the waveform doenst help you much. Get a spectral monitor like Voxengo Span, activate Peak hold and check the volume of the partials.
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Old 21st November 2010, 12:39 PM   #93
epa is online now epa  Netherlands
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thanks mavo.
the discusion imo is about continius lf base notes wich would fry the voice coil if its on the excursion minimum at high levels.
its not about peaks.
my point is that there are never only sine waves happening in music,there are always some harmonics and other sounds present.
the sample is taken from a part in the music were there is no base drum, only snare and high hat and synth.
not saying is wat you say isnt right.

as a side note ,ive done live music PA and i only put compression over the mics and over the end mix with a high treshhold,as i like to keep as much dynamics as possible

Last edited by epa; 21st November 2010 at 12:51 PM.
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Old 21st November 2010, 11:53 PM   #94
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This is another modded 6 fold Xoc1 box using the BMS 18N850v2... I just don't know how to sketch it up yet :/ Anyone up to the task til I learn? I know this will be bigger, but I don't think by too much.

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

This would be near ideal without getting to 600 liters (which I can get flat to 30Hz @ 130dB).

My next favorite is post 73, as it plays ~4-5dB louder at 30Hz and stays flat (which I need) than post 68.

Thanks a ton, everyone!


Justin

Last edited by CRESCENDO; 22nd November 2010 at 12:07 AM. Reason: Links!
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Old 22nd November 2010, 03:15 AM   #95
takku is offline takku  India
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please help i need to know what pant did you use. i did not find Warnex textured lacquer please break it down for me.
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Old 22nd November 2010, 03:35 AM   #96
takku is offline takku  India
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Warnex is a life sciences company devoted to protecting public health by providing laboratory services to the pharmaceutical and healthcare sectors.

this is what i found . i have an all most complete project .
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Old 22nd November 2010, 03:47 AM   #97
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Quote:
Originally Posted by takku View Post
please help i need to know what pant did you use. i did not find Warnex textured lacquer please break it down for me.
Quote:
Originally Posted by wood1y View Post
Here are the brochures:
...

THOMANN
They are shipping to the USA too.
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Old 22nd November 2010, 11:52 AM   #98
Xoc1 is offline Xoc1  United Kingdom
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Crescendo
I have remodelled the 6 fold TH to something similar to what you posted.
If you look you will see that efficiency is slightly more than your sim.
I shifted the point where the taper changes back one fold in the box. This makes the geometry more complicated.
If I was you I would probably forget about adding an inductor to try to flatten the theoretical response. Especially at the power levels that you are attempting.
Attached Images
File Type: jpg BMS18N850v2 6 fold TH 1.jpg (314.4 KB, 4007 views)
File Type: jpg BMS18N850v2 6 fold TH 2.jpg (345.4 KB, 4387 views)
Attached Files
File Type: pdf 18in 30hz - 6 Fold TH Assy.PDF (64.9 KB, 132 views)
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Old 22nd November 2010, 02:03 PM   #99
epa is online now epa  Netherlands
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Quote:
Originally Posted by Xoc1 View Post
Crescendo
I have remodelled the 6 fold TH to something similar to what you posted.
If you look you will see that efficiency is slightly more than your sim.
I shifted the point where the taper changes back one fold in the box. This makes the geometry more complicated.
If I was you I would probably forget about adding an inductor to try to flatten the theoretical response. Especially at the power levels that you are attempting.
almost 700 ltrs.
but then again ,pick any 2 of small ,low and loud
this one would be


















2 cressendo have you seen post 90 ?

Last edited by epa; 22nd November 2010 at 02:10 PM.
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Old 22nd November 2010, 03:05 PM   #100
epa is online now epa  Netherlands
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Quote:
Originally Posted by CRESCENDO View Post
This is another modded 6 fold Xoc1 box using the BMS 18N850v2... I just don't know how to sketch it up yet :/ Anyone up to the task til I learn? I know this will be bigger, but I don't think by too much.






This would be near ideal without getting to 600 liters (which I can get flat to 30Hz @ 130dB).

My next favorite is post 73, as it plays ~4-5dB louder at 30Hz and stays flat (which I need) than post 68.

Thanks a ton, everyone!


Justin
this would prbably be ~650 ltrs
the actual box wil always be bigger than the schematic diagram predicts,because material and corners hr doesn't calculate.!

best way to learn sketching ,is just to do it.
i use autocad but it took me quite a wile before i got the hang of it.
im sure there are easier programs around wich u can use.

Last edited by epa; 22nd November 2010 at 03:10 PM.
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