Time Alignment and crossover networks on the P860

[squeak9798 5,000+ posts]

here's a quote from an audio guy much smarter than me. why i used the word phase...
To understand time alignment, you need to understand phase, and phasing relationships between various parts in the audio circuit. Absolute phase means that when the audio signal goes positive, the speaker cone pushes into the listening space. Reversing the speaker wires reverse the phase, and the phase angle becomes 180 degrees rather than absolute zero. If left in reverse phase, the sound will be delayed by 1/2 cycle. This delay can be converted to inches based on frequency and effects the arrival times of sound to the ear. The ear perceives this as depth or distance from the sound emitting object.

Phase alignment and time alignment are two different things. It is possible to have a phase adjustment (like mentioned in the post) cause an effect that's similar to time alignment.....but they are two different things all together. Phase alignment is not time alignment, even though they can both have a similar affect on the sound.

 

[squeak9798 5,000+ posts]

(I only know of 2 devices that can handle a 4 way on its own, the Audiocontrol 4XS and the Altomobile Drive 30)

There's actually quite a few. Tru F-2 will do 4/5 way xover. Alpine H701 aswell.

 

[djman37 5,000+ posts]

I've got an Altomobile Control 16. Up to 100ms for each of the 2 channels.

 

[djman37 5,000+ posts]

Phase alignment and time alignment are two different things. It is possible to have a phase adjustment (like mentioned in the post) cause an effect that's similar to time alignment.....but they are two different things all together. Phase alignment is not time alignment, even though they can both have a similar affect on the sound.

I gotcha, I was sayin' thats where I heard the term 'phase' used as 'time'

True, it is the ears perception so it is the effect of time delay. The whole document was discussing a poor man's way of correcting 2 sets of speakers in a car.

 

[squeak9798 5,000+ posts]

Yeah....it's actually fairly common to reverse the polarity of one midrange to clear up some phase and imaging anamolies. Phase adjustments like that are sort of like a psuedo-time alignment //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[adam71 5,000+ posts]

Well it should, isn't that HU almost 1000 dollars street price?

Not necessarily, my P9 deck by itself has the following adjustments.

-bass

-treble

-balance

-fader

Thats it. Nothing else.

 

[JonJT 10+ year member]

here's a quote from an audio guy much smarter than me. why i used the word phase...
To understand time alignment, you need to understand phase, and phasing relationships between various parts in the audio circuit. Absolute phase means that when the audio signal goes positive, the speaker cone pushes into the listening space. Reversing the speaker wires reverse the phase, and the phase angle becomes 180 degrees rather than absolute zero. If left in reverse phase, the sound will be delayed by 1/2 cycle. This delay can be converted to inches based on frequency and effects the arrival times of sound to the ear. The ear perceives this as depth or distance from the sound emitting object.

O, I know, but reading it again has made me realized where you were comming from. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[JonJT 10+ year member]

There's actually quite a few. Tru F-2 will do 4/5 way xover. Alpine H701 aswell.

But, their all rather expensive, right? I was just gonna use the P860s internal 3 way and then use the midbass's low pass outputs for sub duty. That would probably be cheeper than everything else. Only problem I see there is that any TA I performed on the midbass frequencies wouldn't be true TA, but that shouldn't be a problem anyway.