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Old 6th October 2008, 09:43 AM   #11
sreten is offline sreten  United Kingdom
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Hi,

You can try a 2nd order rolloff on the IB. Theoretically with the 6dB/
octave gain of the IB you might get a more room friendly response.

If you have plenty of power for the IB you can try a series resistor
which will increase bass around the IB drivers Fs by changing Q.

/sreten.
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Old 6th October 2008, 11:16 AM   #12
mikee55 is offline mikee55  United Kingdom
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Default Hello

Quote:
You can try a 2nd order rolloff on the IB. Theoretically with the 6dB/ octave gain of the IB you might get a more room friendly response.
Sreten, are you saying put a highpass infront?

Quote:
If you have plenty of power for the IB you can try a series resistor which will increase bass around the IB drivers Fs by changing Q
How much power, and how do I calculate the resistor.

Quote:
Analog filters above 24dB/oct are not recommended due to the increasing group delay.
Quote:
peaks or nasty out of band resonances in the low frequency system
Eva, hence the Behringer?

Can't the Behringer be emulated, I got a spare PC and soundcard?

Thankyou, Mike
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Old 6th October 2008, 12:01 PM   #13
sreten is offline sreten  United Kingdom
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Default Re: Hello

Quote:
Originally posted by mikee55


Sreten, are you saying put a highpass infront?


How much power, and how do I calculate the resistor.


Thankyou, Mike

Hi,

No. The low pass is tailored to include the baffle loss.

http://82.95.237.142/mhsoft/spk_calc.asp#newqts

how much extra power depends on the series resistor.

See MJK'S open baffle articles here : http://quarter-wave.com/

/sreten.
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Old 6th October 2008, 01:36 PM   #14
mikee55 is offline mikee55  United Kingdom
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Default New Qts

Hi all, I had a go at the calculator. Does it look right.
Click the image to open in full size.

Cheers Mike
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Old 6th October 2008, 01:46 PM   #15
sreten is offline sreten  United Kingdom
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Default Re: New Qts

Quote:
Originally posted by mikee55
Hi all, I had a go at the calculator. Does it look right.

Cheers Mike

Hi,

You've lost me. Rs = driver Re and R = series resistance.
I've no idea what Rs in your specs are. Assuming Re = 3.7R.

for 0.5R I get Q=0.97, 1R Q=1.07, 2R Q=1.27 etc.

/sreten.
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Old 6th October 2008, 06:06 PM   #16
mikee55 is offline mikee55  United Kingdom
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Default Hello

Just changed the Xover frequency to 23hz, and have a reasonable compromise. I want to understand more, about open baffles. I think, I could replace my Mordaunt Short MS40's with some OB units??

I'd be lucky if I can use the drivers from the M Shorts. Thought provoking.

Thank you all for your help.

Mike
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