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Old 15th September 2007, 11:02 AM   #11
Pano is offline Pano  United States
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Quote:
Originally posted by damianl
not exactly fully flat but there in only about 1db difference between 20k-200hz then a smooth rolloff
Color me doubtful, but I find that hard to believe. Extraordinary measures are needed for a system like that.

But I'm with Sreten - it's just a BSC you want. AKA - a shelving low pass.

Not hard to do. Rule of thumb is to figure what inductor you would need for a 1st order filter at the frequency you want to bend. Use that inductor but bypass it with a resistor about the same value as your driver impedance. Start there and adjust. Have look at the calculators and tables online.

Changing the impedance value will move the frequency point up and down. Changing the resistor value will give you more or less effect - and can roll of the high end if too high a value.
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Old 16th September 2007, 02:45 AM   #12
damianl is offline damianl  Australia
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http://www.tb-speaker.com/detail/1208_03/w3-593sf.htm

Thanks for your help anyway guys I'm thinking of just using an equalizer...
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Old 16th September 2007, 06:27 AM   #13
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Hoho, TB's charts are notoriously unreliable.
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Old 17th September 2007, 02:55 PM   #14
sreten is online now sreten  United Kingdom
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Quote:
Originally posted by damianl
http://www.tb-speaker.com/detail/1208_03/w3-593sf.htm

Thanks for your help anyway guys I'm thinking of just using an equalizer...
Hi,

that chart - free air (no box) and a very large baffle is relevant to,
but does not reflect its response in a box, see Zaphs articles.

You need a BSC circuit. In box they will not go down to 80hz with
an Fs of 110Hz (free air) and probably around 140Hz in box.
Your 200Hz and below boost will not work.

/sreten.
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Old 17th September 2007, 02:56 PM   #15
sreten is online now sreten  United Kingdom
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Quote:
Originally posted by damianl
http://www.tb-speaker.com/detail/1208_03/w3-593sf.htm

Thanks for your help anyway guys I'm thinking of just using an equalizer...
Hi,

that chart - free air (no box) and a very large baffle is relevant to,
but does not reflect its response in a box, see Zaphs articles.

You need a BSC circuit. In box they will not go down to 80hz with
an Fs of 110Hz (free air) and probably around 140Hz in box.
Your 200Hz and below boost will likely not work well.

/sreten.
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