Can two drivers be wired series and inverse phase?

[mayhem13]

Wondering what the drawback would be for a hypothetical Cardoid design where the drivers won't share the enclosure. The drivers are only available 4ohm so parallel isn't an option.

 

[Greebster]

Certainly, +- to -+ or -+ to +- wires in series and reverses phase.

Drawback dunno, too hypothetical

 

[JonSnell Electronic]

Wire in series but keep the phase. + to - and + to - . If you wire them the other way around, all you will hear is the difference in efficiency of each speaker because they will be working against each other.

 

[sine143]

not if he reverses one of the woofers

 

[mayhem13]

Yes.....Cardoid. Instead of sacrificing efficiency by using a single driver's back wave, plan to use a second driver as in a dipole

 

[mayhem13]

Certainly, +- to -+ or -+ to +- wires in series and reverses phase.

Drawback dunno, too hypothetical

I think the hypothetical will show up around the Fs of each driver depending on the system QTS. We shall see! Lol

 

[sreten]

Hi,

If your doing it like the SL6000 sub, they are wired out out phase.

rgds, sreten.

 

[Face]

Depending on the distance between the two drivers, you may need some sort of delay for cardioid response. Possibly some padding for the rear driver too.

 

[Philfr]

Yes.....Cardoid. Instead of sacrificing efficiency by using a single driver's back wave, plan to use a second driver as in a dipole

Hi,
Yes it's works..
I call it Dual Acoustic Dipole.
http://www.diyaudio.com/forums/full-range/253992-true-dipole.html
With Fostex FE126eN :

Using with H frame, Xo near 200 hz :

Axis at listening point (3 m) :

Phil.

 

[OllBoll]

Hi,
Yes it's works..
I call it Dual Acoustic Dipole.
http://www.diyaudio.com/forums/full-range/253992-true-dipole.html
With Fostex FE126eN :

Using with H frame, Xo near 200 hz :

Axis at listening point (3 m) :

Phil.

Interesting. Do you have sensitivity measurements? I did try such a setup but compared to "normal" one pointing forwards and one backwards but above and below each other I lost a lot of sensitivity, about 6 dB so distortion was far higher.

Or rather, I lost sensitivity if I damped between the drivers which I had to as I got an on axis null if I didn't. I suspect it is because the rear driver passed through the cone of the other driver. In my case I used shallow 6.5" drivers so the null was between ~ 600 - 1000 hz.

 

[mayhem13]

That on axis response is extremely encouraging. My concept uses a Fullrange as well with a monopole woofer but the drivers are in enclosures so no rear wave interaction. Following on the work of the LXMini but purpose built for desktop nearfield listening.

 

[Zvu]

Hi...........

With Fostex FE126eN :

Axis at listening point (3 m) :

Phil.

What's the xover you used on Fostex ?

I measured Fostex fe126e and it looks good but not that good

 

[Philfr]

What's the xover you used on Fostex ?

I measured Fostex fe126e and it looks good but not that good

Hi Zvu,
Xo 185 hz 12 db..
Response curve is not often the sound quality !
Phil.

 

[Zvu]

I haven't commented sound quality (that i liked very much in fe126e), i commented on the measurements. This is what i got and it's pretty similar to other measurements i found on the web.

Mine:

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Troels

K+T

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