Vertical Off-axis FR of EOS-6 and EOS-8 - AVS Forum
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post #1 of 6 Old 07-22-2014, 08:16 PM - Thread Starter
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Vertical Off-axis FR of EOS-6 and EOS-8

Can someone point me to the vertical off-axis data for the EOS-6 or the EOS-8? I'm not sure if measurements were taken of the Fusion-6 and Fusion-8 Alchemy? I've been searching for a while, but so far I'm coming up empty.

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post #2 of 6 Old 07-22-2014, 11:13 PM
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I have the EOS-6 measured here: The Great Waveguide Shootout!!!


Unfortunately no EOS-8 measurements.


The jig I had been using was causing some weird diffraction/reflection issues so the FR is a little rough but the polars should be fairly accurate for that waveguide. I did find the cause and have a solution to that issue but I have not had the time to set the rig up again and measure all of the waveguides.


I have also attached some off axis measurements of the Fusion-6, above/below axis 0-90 degrees in 10 degree increments. I am not sure if that was with the final crossover but the off axis behavior would not change much at all. I should also note that was indoors so pretty much everything below 6-800hz should be ignored (all lumpy from floor/ceiling/wall reflections).
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post #3 of 6 Old 07-23-2014, 06:06 AM
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The problem with off vertical axis two ways is the distance between the waveguide and the woofer to the listener changes as you move above and below axis.

The bigger the woofer and waveguide, presumably the worse the off vertical axis response will be due to time alignment shift.

The waveguides themselves are designed to be pretty consistent off axis, its their relative relationship to the woofer that changes:

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post #4 of 6 Old 07-23-2014, 07:33 AM - Thread Starter
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mtg90, thanks for the info, and thanks for taking the time to make those measurements! I think that's what I need. Any guess as to how the EOS-8 and Fusion-8 would differ from the EOS-6/Fusion-6?

Nick, you are correct, sir. That's why this data is important, though often overlooked. As we all know, the sound in most of our listening spaces consists of both direct and reflected sounds. For something like a surround, we are going to get a large amount of reflected sound off the ceiling and/or soffit, so we need to understand what that sound consists of.

If your point is that we need data for the specific speaker configuration and not just the wave-guide, I suspect you are correct there as well. Nyal asked for the EOS data, and I haven't had a chance to follow up with him yet. Fortunately for me, mtg90 provided some of that data as well

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post #5 of 6 Old 07-24-2014, 07:23 PM
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I'm curious, in layman noob terms (I searched around and can't seem to find anything), what's the difference between SEOS vs EOS waveguides?
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post #6 of 6 Old 07-24-2014, 07:34 PM
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Quote:
Originally Posted by tential View Post
I'm curious, in layman noob terms (I searched around and can't seem to find anything), what's the difference between SEOS vs EOS waveguides?
Eos smaller and less directivity. I have eos 8 and its very good. In the mlp I don't know if you would hear much of a difference between seos and eos.
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