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Old 16th July 2012, 04:32 PM   #1
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Default Help with wiring rear firing tweeter?

I would like to run a rear firing tweeter with my open baffle 8 inch drivers.
so do I need to run these out of phase with fullrangers and still
leave 1uf cap at positive terminal of tweeter even though the
tweeter is actually getting a positive feed on the negative side.

Thanks,

Scott
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Old 16th July 2012, 05:01 PM   #2
ODougbo is offline ODougbo  United States
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Scott,

Heck if it's not too hard to change wires, try it both ways.

btw, reverse switches are easy to make.
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Old 16th July 2012, 05:12 PM   #3
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Tweeter is 8 ohm and fullrange driver is 5.9 ohm so wiring the tweeter out of phase
what impedance would my amp see.

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Originally Posted by ODougbo View Post
Scott,

Heck if it's not too hard to change wires, try it both ways.

btw, reverse switches are easy to make.

Last edited by bigaudioscotto; 16th July 2012 at 05:18 PM.
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Old 16th July 2012, 05:34 PM   #4
IG81 is offline IG81  Canada
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Your amp will see the FR's impedance mostly, since tweeter Z with the series cap will be high under ~20kHz. The FR driver likely has an impedance rise with frequency so will be of higher Z once the tweeter circuit's own Z starts to drop.

Tweeter polarity should not matter in this case since the waves are not even coincident, but try it both way and if you end-up prefering one leave it as is.

IG
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Old 16th July 2012, 05:36 PM   #5
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Okay Thanks,
I just wanted to make sure that it was a safe load on the Amp.

Scott

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Originally Posted by IG81 View Post
Your amp will see the FR's impedance mostly, since tweeter Z with the series cap will be high under ~20kHz. The FR driver likely has an impedance rise with frequency so will be of higher Z once the tweeter circuit's own Z starts to drop.

Tweeter polarity should not matter in this case since the waves are not even coincident, but try it both way and if you end-up prefering one leave it as is.

IG
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Old 16th July 2012, 06:56 PM   #6
IG81 is offline IG81  Canada
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Just out of interest, what 8" driver and super-tweeter are you using?

IG
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Old 16th July 2012, 07:14 PM   #7
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Can I ask, why rear firing? I see this being discussed on the forum but have never understood it. I've never tried it either, so just wondering what you're trying to achieve here.
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Old 16th July 2012, 08:08 PM   #8
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The reason to rear fire is to keep the single point source firing at you
and the rear tweeter just adds some air to the top end without firing directly at you. it seems to have a more realistic soundstage that way to me.

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Originally Posted by tuxedocivic View Post
Can I ask, why rear firing? I see this being discussed on the forum but have never understood it. I've never tried it either, so just wondering what you're trying to achieve here.
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Old 16th July 2012, 08:10 PM   #9
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I am using Wild Burro Betsy 8 inch & Eminence ASD 1001 horn driver
with the Dayton 90 X 40 horn waveguide.

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Originally Posted by IG81 View Post
Just out of interest, what 8" driver and super-tweeter are you using?

IG
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