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Old 15th April 2005, 06:52 AM   #1
Greg F is offline Greg F  Australia
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Join Date: Oct 2004
Default Woofer cross over frequency

Hi Guys ...

Could anybody out here help ...

I have Jaycar CW2107 6/6.5 woofer Fs 39 Freq 38-5,000Hz
and Jaycar CT2018 tweeter (AKA Vifa D19SD-05-08) Fs 1700Hz Freq 3,000-20,000Hz

Would like to run them via linkwitz 24db active Xover

My question is ... if avarage rule X/o 2-3 times above Fs in this case 1700 for tweeter = 3400 - > 5100 and woofer freg 38-5000 is this ok if I cross woofer so high (have no graphs for woofer)

At present Iam running Jaycars version of 3500 passive crossover from one of there older kits that used CW2107 woofer ...

Thks Greg ...
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Old 15th April 2005, 09:35 AM   #2
Gregm is offline Gregm  Europe
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Default Re: Woofer cross over frequency

Quote:
Originally posted by Greg F
Hi Guys ...
My question is ... if avarage rule X/o 2-3 times above Fs in this case 1700 for tweeter = 3400 - > 5100 and woofer freg 38-5000 is this ok if I cross woofer so high (have no graphs for woofer)
Thks Greg ...
I wouldn't. Since you're LR 24ing, why don't you cut the tweet @ 3,4k, rather than have the little woof beaming at you so high.

BTW, even a range of 3,4k -- ~100Hz is rather a tall order for that 6,5", so don't expect heavy bass duties. You may even consider cutting the mid off ~120-150 and plan for a woof/subwoof channel later. Cheers
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Old 15th April 2005, 02:30 PM   #3
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
I think you are struggling.
This tweeter should work from 3.4k up but might be better able to survive & sound nicer from 4k up.
The mid unit will sound pretty ragged if taken beyond 2k and may be poor in the octave below that.
Try a 3k4 xover, but budget for a mid unit to fill that gap.
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regards Andrew T.
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Old 18th April 2005, 01:38 AM   #4
Greg F is offline Greg F  Australia
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Join Date: Oct 2004
Gregm, AndrewT

Thks for your reply ...

Might just leave the Xover as is, I did set it to 3410Hz

The drivers are in 24-25 litre ported tower enclosure behind lounge chair in the corner, bass seems OK

Does it matter as much if I let the woofer roll of with high pass filter just to keep cone excursion down

At the moment it is tuned to 40Hz -3db @ 38Hz (no high pass filter) only standard passive filter (ex Jaycar)

Not using the Bass channel of the Xover (Maybe later for sub but not likely no room)

Have tweeter @ 3410 and Mid @ 3410 & I think 48Hz but using this I will give me -3db of 58Hz ... So I was going to change that to 30Hz just to control cone excursion (97db @ just under Xmax) loud enough for that room & more ....

Any thoughts ?

Greg ...
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