You are writing about polarity, phase is different at every frequency.
Positive voltage making the cone go towards the horn throat is "normal" compared to a front loaded speaker.
A delay approximately corresponding to the horn path length then needs to be added to the top cabinet for "in phase" response through the crossover region..
For tapped horns with a path length approximating one wave length at the crossover frequency, one can observe an "in phase" response at crossover, but the TH will actually be lagging by one wavelength and will not sound as "punchy" as it will if the tops are time aligned.
Art Welter
Hi yes, but as it's often referred to as Phase Reversed or Out of Phase, when a driver cone is facing that way, that's why i said that.
So TH designs that have the magnet facing the throat, should be Polarity reversed then, either directly at the Amp or Driver/s, or via an Active Xover ?
I've not seen Any mention of this !
Agreed.
I use a 4th order LR crossover (active, of course) on mine and found a big suckout at ~80Hz when everything was wired +ve to +ve.
Reversed the wiring of the subwoofers, and all is well.
Yes, polarity is often confused with phase.
Yes, if the magnet was facing the throat, polarity should be reversed.
Positive voltage should make the cone move towards the throat.
Most tapped horns have the magnet facing the mouth, and the front of the cone faces the horn throat, so should use "normal" polarity.
That said, the horn path length still needs to be accounted for by delaying the top cabinets by (approximately) the path length difference between the top and bottom cabinets.
Art
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.