Understanding Loudspeaker Coherency

[prerich]

Originally Posted by Big Daddy

I did not intend to list every phase coherent speaker in post #1. I just used a few examples to help people understand phase coherency. I also added a few more to post #2. Unfortunately, there is a limited number of characters that you are allowed to include in one post. If you need additional room, you need to make another post.

The fact that you mentioned Dynaudio is good enough. If you want, you can always add a few pictures.

Ok BD - I have a question - is there a listening distance where Time-Alignment doesn't serve a function (or that the benefit would be unnoticable)? As most speaker designs are a compromise of some sort, say dynamics for imaging ect. Where would the benefit of Time Alignment be most noticable - when sitting further away from the speakers (since this would mean a farther distance for each indiviual wave to travel before reaching the listener - making the waves more out of time with each other)?

[Big Daddy]

Originally Posted by prerich

Ok BD - I have a question - is there a listening distance where Time-Alignment doesn't serve a function (or that the benefit would be unnoticable)? As most speaker designs are a compromise of some sort, say dynamics for imaging ect. Where would the benefit of Time Alignment be most noticable - when sitting further away from the speakers (since this would mean a farther distance for each indiviual wave to travel before reaching the listener - making the waves more out of time with each other)?

Time alignment and angling of the drivers depends on the height of the ears and distance from the speakers.

As I indicated in Post #1, Richard Vanderseen is the champion of time and phase coherency. He has designed speakers so that you can adjust the backward tilt of the speaker so that all the drivers are perfectly synchronized and their signals converge at the listener's ears. The angle of tilt depends on how far the listener is from the speaker. In their owner's manual, there is a graph that tells you the required amount of offset in relation to the distance of the listening position.

The image is from the Vandersteen 3A Manual.

CoherentSpeakers.jpg

[Matty_J]

Does Rockport Technologies include modest forklift with those asking prices?
How else can one move those beasts?

[Big Daddy]

Originally Posted by Matty_J

Does Rockport Technologies include modest forklift with those asking prices?
How else can one move those beasts?

You buy them first and then build a house around them.

[prerich]

Originally Posted by Big Daddy

Time alignment and angling of the drivers depends on the height of the ears and distance from the speakers.

As I indicated in Post #1, Richard Vanderseen is the champion of time and phase coherency. He has designed speakers so that you can adjust the backward tilt of the speaker so that all the drivers are perfectly synchronized and their signals converge at the listener's ears. The angle of tilt depends on how far the listener is from the speaker. In their owner's manual, there is a graph that tells you the required amount of offset in relation to the distance of the listening position.

The image is from the [URL="http://www.vandersteen.com/3asigmanual.pdf"]Vandersteen 3A Manual[/

Attachment 36491

Nice I read some info on his site and he does realize that you lose dynamics (unless you have the Quattro) I thought about using two more DCX2496 units to tri-amp my front array (yes I would need 6 more channels of amplification...no sweat). This would allow the DCX's to time and phase align the Heresy speakers digitally (a guy in HT Magazine did this with his La Scalas) just a thought


Nice I read some info on his site and he does realize that you lose dynamics (unless you have the Quattro) I thought about using two more DCX2496 units to tri-amp my front array (yes I would need 6 more channels of amplification...no sweat). This would allow the DCX's to time and phase align the Heresy speakers digitally (a guy in HT Magazine did this with his La Scalas) just a thought

[pgblu]

[QUOTE=prerich;5067118]Nice I read some info on his site and he does realize that you lose dynamics (unless you have the Quattro) I thought about using two more DCX2496 units to tri-amp my front array (yes I would need 6 more channels of amplification...no sweat). This would allow the DCX's to time and phase align the Heresy speakers digitally (a guy in HT Magazine did this with his La Scalas) just a thought


This is one of the reasons I went with the Quatros over the 3A signatures. With a built in sub, you can place the Quatro where it will image the best, and then "tune" the bass to that location. It has been my experience that the best place for imaging is NOT the best place for the best bass. Also, the Quatros have proven to be easier to drive, as the low bass has it's own built in sub and takes some of the load off of the main amplifier.

FWIW, adjusting the angle of the speaker to your listening position is reasonably straight forward with his instructions in the owner's manual. I was "in between" 2 of the spacers and experimented between the 2 to determine the best angle. Well worth the extra effort...

[prerich]

I'm gonna go ahead and do it!!!! Instead of actively crossing over my Heresy speakers, I'm going to install ALK's new Cornscala-Wall Universal crossover (yes it's a 1st order crossover)!

[crazyBLUE]

Originally Posted by Big Daddy

You buy them first and then build a house around them.

That was good Big Daddy

My Bostons are speaker coherent< The front is curved back & the drivers are all angled differently. Of course they are not $100,000 speakers

[Big Daddy]

Originally Posted by crazyBLUE

That was good Big Daddy

My Bostons are speaker coherent< The front is curved back & the drivers are all angled differently. Of course they are not $100,000 speakers

[Show spoiler]

Do they weigh 900 pounds each? If the answer is no, they are not coherent.

[Matty_J]

Originally Posted by Big Daddy

Do they weigh 900 pounds each? If the answer is no, they are not coherent.

Oh no Crazy, You're gonna have to start all over. Just leave those Bostons on the curb, and start saving up.