Series connecting woofers XO's.

Eugenio70 · 4th November 2011, 05:45 AM

Hi. I'm building some MTM's and have 4 ohm mids, also have 4 ohm crossovers, but would like to end up with 8 ohm speakers.
If I only use 1 crossover and connect the 2 mids wired in series to it my cross point would change as it's designed for 4 ohms right?
So is it ok to wire the amp side of the crossovers in series instead of the mids? Please look at the attached image.

Thanks!

wintermute · 07:00 AM

No I don't think that this will give you the desired results either. My initial feeling is that this will result in a higher order slope that what you intend.

You would be better off changing the crossover values to match the impedance of the series connected woofers.

The other thing is it sounds like either you have taken something that was supposed to be for a normal MT and are trying to turn it into an MTM, or you are using off the shelf crossovers. Either way the result is probably not going to be suitable.

An MTM has some specific requirements in the crossover design if you want to have a reasonably wide vertical polar response.

edt: and yes you are correct, using a crossover designed for 4 ohms with an 8 ohm impedance will shift the crossover point.
Tony.

Moondog55 · 4th November 2011, 07:09 AM

Not just the XO point but the shape also

Eugenio70 · 4th November 2011, 07:25 AM

Quote:

Originally Posted by wintermute

The other thing is it sounds like either you have taken something that was supposed to be for a normal MT and are trying to turn it into an MTM, or you are using off the shelf crossovers.
Tony.

Yes, this are off the shelf component kits. I made a pair using the same woofers but with 8 ohm crossovers at the same frequency as the originals and they turned out very good, but now I would like to use the 4 ohm crossovers that come with them instead of buying more crossovers. Guess I would have to do some testing.

Thanks!

sreten · 4th November 2011, 02:21 PM

Quote:

Originally Posted by Eugenio70

So is it ok to wire the amp side of the crossovers in series instead of the mids?
Thanks!

Hi, the short answer is yes it will be OK to do that, rgds, sreten.

Eugenio70 · 4th November 2011, 02:33 PM

Thanks Sreten!

4th November 2011, 06:55 AM	#2
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	No I don't think that this will give you the desired results either. My initial feeling is that this will result in a higher order slope that what you intend. You would be better off changing the crossover values to match the impedance of the series connected woofers. The other thing is it sounds like either you have taken something that was supposed to be for a normal MT and are trying to turn it into an MTM, or you are using off the shelf crossovers. Either way the result is probably not going to be suitable. An MTM has some specific requirements in the crossover design if you want to have a reasonably wide vertical polar response. edt: and yes you are correct, using a crossover designed for 4 ohms with an 8 ohm impedance will shift the crossover point. Tony. __________________ Any intelligence I may appear to have is purely artificial! Some of my photos Last edited by wintermute; 4th November 2011 at 07:00 AM. Reason: add confirmation

4th November 2011, 07:09 AM	#3
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Not just the XO point but the shape also __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

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4th November 2011, 02:33 PM	#6
Eugenio70 diyAudio Member Join Date: Dec 2007	Thanks Sreten!

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