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Multi-Way Conventional loudspeakers with crossovers

What is Time-Alignment
What is Time-Alignment
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Old 28th December 2017, 09:10 PM   #11
scottjoplin is offline scottjoplin  Wales
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Originally Posted by Michael Chua View Post
Time alignment is acoustic time domain. Electrical phase is totally different.
Yes....but......answers on a postcard please
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Old 28th December 2017, 09:33 PM   #12
globalplayer is offline globalplayer  Germany
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Originally Posted by Michael Chua View Post
This is one of my speakers with good electrical phase. You can see there are no wild fluctuations at the crossover region.

What is Time-Alignment
Looks like a ported box.
~52 hz tuning.
Port tuning is lower than the fs of the driver.
Probably 8 ohm speaker.
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Old 28th December 2017, 09:43 PM   #13
mark100 is offline mark100  United States
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Originally Posted by andy2 View Post
In the real world, it's very difficult to get the tweeter and woofer to aligne perfectly. You could get them to "time aligned" at a specific frequency but not at "all frequencies".
As I gain experience with FIR processing it's getting easier and easier to achieve excellent alignment throughout the spectrum...even through the sub range if overall latency can be tolerated.

New world...it makes the opening alignment example seem almost primitive...
(not to disparage it
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Old 28th December 2017, 10:24 PM   #14
Michael Chua is offline Michael Chua  United States
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Originally Posted by globalplayer View Post
Looks like a ported box.
~52 hz tuning.
Port tuning is lower than the fs of the driver.
Probably 8 ohm speaker.
Driver is a Zaph ZA14. Nominal Impedance=8 ohms, Fs=65Hz.
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Old 28th December 2017, 10:41 PM   #15
globalplayer is offline globalplayer  Germany
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Really nice driver for the money. The cone break-up at 9k is negligible.
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Old 28th December 2017, 10:51 PM   #16
Michael Chua is offline Michael Chua  United States
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Yeah, pretty good. Excellent mids. The only issue I have with this driver is the bass. It's not loud enough unless I tune the box higher up.
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Old 29th December 2017, 12:08 AM   #17
Dissi is offline Dissi  Switzerland
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Originally Posted by Michael Chua View Post
Simply put, it is the aligning of the woofer and tweeter acoustic phases at the crossover frequency.
What you describe is called phase alignment. Time alignment is something else. The term is used for loudspeakers applying any method to change the acoustic center of a driver, such as a tilted or a stepped baffle, a waveguide or a delay network in the crossover.

Loudspeaker time alignment - Wikipedia
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Old 29th December 2017, 12:19 AM   #18
Old'n'Cranky is offline Old'n'Cranky  Australia
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I have a spanner to throw in here.
And for me it's an honest and serious question.

In regards to time alignment, and phase and baffle diffraction, and all the other things that everyone seems to get so, calculating, about.

In the real world, where any given room is different from everyone else's.

Do any of these alignment issues actually matter ?

Lets go a step further.
If I set up my speakers, and room, and chair, so that all parameters are perfect.
I then move the chair, isn't that then going to make the alignments etc invalid ?
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Old 29th December 2017, 12:41 AM   #19
scottjoplin is offline scottjoplin  Wales
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The idea is to get multiple drivers to as nearly as possible appear as one. The effect of moving your chair will mainly be governed by the directivity and reflectivity of the speaker/room set-up
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Old 29th December 2017, 12:50 AM   #20
Old'n'Cranky is offline Old'n'Cranky  Australia
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So if a speaker is designed and built to have perfect everything in the designers room.
It will obviously change in the customers room.
Doesn't that render some or more of the designers efforts useless ?
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