SE Measurements

[Quinn]

"We actually post a very revealing graph on our website called the cumulative spectral decay. This is seldom understood, but still a highly important measurement. This is a measurement of a fast impulse consisting of thousands of frequencies ranging from 400Hz to 20Khz. What the graph reveals is what “noise” is left over once the initial impulse stops (in milliseconds). " http://forum.ascendacoustics.com/sho...2&postcount=17

Use the search function with the term, cumulative spectral decay. You will find more explanations but most of it is in regard to the differences between the old 170 and 340 classsics. I didn't turn up anything regarding the new SE versions and CSD.

[jad5]

This is a little off topic but in the specifications section there are no crossover points or type given. Are they listed somewhere else? If not does anyone know what they are.

[Mag_Neato]

The crossover is the heart-n-soul of a speaker, so it is proprietary information that Ascend probably wants to keep out of the hands of it's competitors. Sure, someone can disect a crossover and reverse-engineer it, but they are not going to give it away for free.

Dave put in a ton of R&D for the SE's with the related time/financial investment. I assume he has been awarded, or applied for, patents. I know the SEAS tweeter is exclusively his, with a variation available from SEAS. I ASSume the same goes for the new woofers.

[jad5]

The crossover is the heart-n-soul of a speaker, so it is proprietary information that Ascend probably wants to keep out of the hands of it's competitors. Sure, someone can disect a crossover and reverse-engineer it, but they are not going to give it away for free.

Dave put in a ton of R&D for the SE's with the related time/financial investment. I assume he has been awarded, or applied for, patents. I know the SEAS tweeter is exclusively his, with a variation available from SEAS. I ASSume the same goes for the new woofers.

Right now I'm looking for speakers and the Ascends are some I'm considering. I've been to many web sites and I don't remember too many of them not listing what order the crossover is and what the crossover points are.

[BradJudy]

This is really a vendor preference item. Let's do a quick survey of ID brands:

Axiom: x-over point, but not slope/order
AV123: varies by speaker, most have x-over point but not slope (some have slope, some have neither)
Aperion: no x-over info
SVS: no x-over info
Hsu Research: no x-over info
ACI: no x-over info
Home Theater direct: both x-over point and order
VMPS: x-over point, but not slope/order
Odyssey: no x-over info

I didn't go around and survey all of the big store brands since I didn't want to take that much time, but from the online brands it's clear there isn't a standard for what, if any, crossover info is given.

[Quinn]

Ascend uses a 4th order Linkowitz-Riley crossover. About the only place it is mentioned is in The $ensible Sound review in the paragraph at the top of page two. The crossover point in that article is for the Classic version. The SE's tweeter allows for a lower crossover. I don't know where the present crossover is and don't see an obvious artifacts on the CSD that would tell it's location.

[jad5]

Ascend uses a 4th order Linkowitz-Riley crossover. About the only place it is mentioned is in The $ensible Sound review in the paragraph at the top of page two. The crossover point in that article is for the Classic version. The SE's tweeter allows for a lower crossover. I don't know where the present crossover is and don't see an obvious artifacts on the CSD that would tell it's location.

Thanks for the info Quinn.

[muzz]

This is really a vendor preference item. Let's do a quick survey of ID brands:

Axiom: x-over point, but not slope/order
AV123: varies by speaker, most have x-over point but not slope (some have slope, some have neither)
Aperion: no x-over info
SVS: no x-over info
Hsu Research: no x-over info
ACI: no x-over info
Home Theater direct: both x-over point and order
VMPS: x-over point, but not slope/order
Odyssey: no x-over info

I didn't go around and survey all of the big store brands since I didn't want to take that much time, but from the online brands it's clear there isn't a standard for what, if any, crossover info is given.

Yep HTD will give you that INFO, but they won't put up a simple FR graph.......

[JackT]

Yep HTD will give you that INFO, but they won't put up a simple FR graph.......

Am I correct that Hsu does not provide FR graphs for anything? Do they provide that if you ask?

[curtis]

Right now I'm looking for speakers and the Ascends are some I'm considering. I've been to many web sites and I don't remember too many of them not listing what order the crossover is and what the crossover points are.

Out of curiosity, how will this information affect your decision?