Understanding Loudspeaker Coherency

[prerich]

Originally Posted by Big Daddy

Thanks. I will have to check Totem Wind. Normally, a time and phase coheret speaker must meet the two conditions stated in post #1.

Add Joseph Audio to your list At least the high-end ones.

[Big Daddy]

Originally Posted by prerich

Add Joseph Audio to your list At least the high-end ones.

Thank you. I added information to post #2.

[Big Daddy]

Ontario, Canada is the center (or centre) of many speaker manufacturing companies. Although many of us have heard of Paradigm, PSB, Axiom, Energy, Mirage, etc, there are a few much smaller boutique speaker companies. One such company is Reference 3A. All the speakers from Reference 3A are phase coherent. No crossover is used for their midrange drivers for phase coherency. The drivers are also angled for correct time alignment. If you are in the market for very good high-end speakers, Reference 3A is highly recommended.

Episode:
http://www.reference3a.com/episode.htm

A two way design utilizing our own directly coupled (no crossover) hyper exponential 8" (20 cm.) woven carbon-fiber main driver, superb 1" (24mm.) soft textile dome tweeter and a gold coated fine ceramic super high frequency exciter.

Front baffle is tilted back at a critical angle and the drivers are positioned precisely for correct time alignment and sound wave propagation.

Grand Veena:
http://www.reference3a.com/grandveena.htm

New Grand Veena is a tall, slender tower housing five seamlessly integrated unique drivers. The front baffle is tilted back at a critical angle and the drivers are positioned precisely for correct time alignment and sound wave propagation. The multi chamber cabinet provides isolation to avoid interference between the drivers operating at different frequency ranges.

Achieving a coherent phase response has always been an utmost priority for us and a design criterion with all our loudspeakers. Carefully assembling the drivers with correct parameters and choosing a more direct signal-path design option, along with critical placement of the perfectly pair matched drivers allows us to achieve this goal with our Grand Veena. They project harmonically rich, clear and expansive soundstage images and offer fatigueless extended listening sessions.

Our own hand-built 7" (170 mm.) main driver is hyper-exponentially shaped and covers a wide range of the music evenly. Utilising advanced materials and techniques the driver is designed to not require crossovers and it is coupled directly to the amplifier. The potentially harmful effects of crossover components are removed from the path so the musical signal arrives at the driver uninterrupted and intact. Every tiny musical detail is tracked precisely and immediately.

[crazyBLUE]

Beautiful speakers & quite an impressive read on the Grand Veena, They probably cost serious bucks I am sure !

[Big Daddy]

Originally Posted by crazyBLUE

Beautiful speakers & quite an impressive read on the Grand Veena, They probably cost serious bucks I am sure !

These are the list prices. I am sure it is possible to find better deals from dealers.

Dulcet:
$1795, or $1975 in Premium Finishes

MM DeCapo:
$2990 in natural or red Maple, $3289 in piano black lacquer

Veena:
$3495 - Natural Maple, Cherry Red Stained Maple, $3845 Piano Gloss Black

Episode:
$5500 in natural Maple, red Maple or black Maple. $6050 in piano black lacquer

Grand Veena:
$8795 in natural or red Maple. $9200 in piano black lacquer

[jsr]

Interesting read. A couple of questions...

1. Why does placing the higher frequency drivers further away (relative to lower frequency drivers) help with phase/time alignment?

2. Why does angling the drivers upward help with phase/time alignment?

[rpatt]

When I get my PT800s & PS1400s docked, they will become four way biamped, time aligned towers.

[rpatt]

Originally Posted by jsr

Interesting read. A couple of questions...

1. Why does placing the higher frequency drivers further away (relative to lower frequency drivers) help with phase/time alignment?

2. Why does angling the drivers upward help with phase/time alignment?

1. The low frequency driver cones are deeper. By moving the high frequency driver cones back, the ends of the voice coils line up vertically and the sound waves reach your ears at the same time.

2. Same as #1.