Help with wiring rear firing tweeter?

bigaudioscotto · 16th July 2012, 04:32 PM

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

ODougbo · 16th July 2012, 05:01 PM

Scott,

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

btw, reverse switches are easy to make.

bigaudioscotto · 05:18 PM

Tweeter is 8 ohm and fullrange driver is 5.9 ohm so wiring the tweeter out of phase
what impedance would my amp see.

Quote:

Originally Posted by ODougbo

Scott,

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

btw, reverse switches are easy to make.

IG81 · 16th July 2012, 05:34 PM

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

bigaudioscotto · 16th July 2012, 05:36 PM

Okay Thanks,
I just wanted to make sure that it was a safe load on the Amp.

Scott

Quote:

Originally Posted by IG81

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

IG81 · 16th July 2012, 06:56 PM

Just out of interest, what 8" driver and super-tweeter are you using?

IG

tuxedocivic · 16th July 2012, 07:14 PM

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.

bigaudioscotto · 16th July 2012, 08:08 PM

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.

Quote:

Originally Posted by tuxedocivic

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.

bigaudioscotto · 16th July 2012, 08:10 PM

I am using Wild Burro Betsy 8 inch & Eminence ASD 1001 horn driver
with the Dayton 90 X 40 horn waveguide.

Quote:

Originally Posted by IG81

Just out of interest, what 8" driver and super-tweeter are you using?

IG

16th July 2012, 04:32 PM	#1
bigaudioscotto diyAudio Member Join Date: Sep 2004 Location: North Carolina,	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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16th July 2012, 05:01 PM	#2
ODougbo diyAudio Member Join Date: Aug 2011 Location: Maryland USA	Scott, Heck if it's not too hard to change wires, try it both ways. btw, reverse switches are easy to make.

16th July 2012, 05:34 PM	#4
IG81 diyAudio Member Join Date: Feb 2008	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

16th July 2012, 06:56 PM	#6
IG81 diyAudio Member Join Date: Feb 2008	Just out of interest, what 8" driver and super-tweeter are you using? IG

16th July 2012, 07:14 PM	#7
tuxedocivic diyAudio Member Join Date: Jan 2011 Location: Ladysmith, BC	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.