Highpass Filter Help Needed

Greg M · 18th May 2011, 11:54 AM

I have a 16 ohm horn I would like to build a highpass filter for.

800hz with 12db roll off.

All the design discussion I have seen never seem to go above 8 ohms?

I have a tube stereo amp (35w per ch) and would like to run one channel to the woofer and one to the horn. It would give me the advantage of being able to set the output transformer according to the ohm load of the speaker (should I get experimental)

Anyway need help with a 16ohm 800hz 12 db high pass filter.
Thanks

PS
I'd buy one if I could find one

AllenB · 18th May 2011, 04:12 PM

The short answer would be to simply halve the capacitor and double the inductor values obtained from assuming the driver were 8 ohms.

Greg M · 18th May 2011, 04:19 PM

Using the online calculator HERE

I came up with a couple values for components for a highpass filter for the 16 ohm driver. Wanted to run this by anyone that had a bit more experience than I do with this type of thing

Linkwitz-Riley type xovr
16 ohm driver
821hz crossover point

C1 = 6.06 µF
L1 = 6.203 mH

I fiddled with the crossover point to get the component values close to some off the shelf values.

Do these values sound reasonable?

AllenB · 18th May 2011, 04:40 PM

Yes, they are exactly what you are asking for. They might work for your horn.

Greg M · 18th May 2011, 05:57 PM

Thanks
As long as my overly expensive, no longer made driver doesn't go poof! I'm happy

Inductor · 19th May 2011, 11:20 AM

You should need some attenuation on the horn too (usually needed), or at the pre-stage.

18th May 2011, 11:54 AM	#1
Greg M diyAudio Member Join Date: Nov 2010 Location: Poulsbo, WA	Highpass Filter Help Needed I have a 16 ohm horn I would like to build a highpass filter for. 800hz with 12db roll off. All the design discussion I have seen never seem to go above 8 ohms? I have a tube stereo amp (35w per ch) and would like to run one channel to the woofer and one to the horn. It would give me the advantage of being able to set the output transformer according to the ohm load of the speaker (should I get experimental) Anyway need help with a 16ohm 800hz 12 db high pass filter. Thanks PS I'd buy one if I could find one

19th May 2011, 11:20 AM	#6
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	You should need some attenuation on the horn too (usually needed), or at the pre-stage. __________________ What the Hell is this crap?! It's not crap, it's muzak.

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18th May 2011, 04:12 PM	#2
AllenB diyAudio Member Join Date: Oct 2008	The short answer would be to simply halve the capacitor and double the inductor values obtained from assuming the driver were 8 ohms.

18th May 2011, 04:19 PM	#3
Greg M diyAudio Member Join Date: Nov 2010 Location: Poulsbo, WA	Using the online calculator HERE I came up with a couple values for components for a highpass filter for the 16 ohm driver. Wanted to run this by anyone that had a bit more experience than I do with this type of thing Linkwitz-Riley type xovr 16 ohm driver 821hz crossover point C1 = 6.06 µF L1 = 6.203 mH I fiddled with the crossover point to get the component values close to some off the shelf values. Do these values sound reasonable?

18th May 2011, 04:40 PM	#4
AllenB diyAudio Member Join Date: Oct 2008	Yes, they are exactly what you are asking for. They might work for your horn.

18th May 2011, 05:57 PM	#5
Greg M diyAudio Member Join Date: Nov 2010 Location: Poulsbo, WA	Thanks As long as my overly expensive, no longer made driver doesn't go poof! I'm happy

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