Andy Hi, looks fascinating, this is the software right?
http://andyc.diy-audio-engineering.org/mso/html/index.html
Keith
http://andyc.diy-audio-engineering.org/mso/html/index.html
Keith
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Wanted: Proof of multiple subs and sub EQ
- Thread starter Ethan Winer
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Yes, that's the one.
Merci.
Keith
Keith
That graph strikes me as curious too...
dallasjustice
Major Contributor
The only good thing about it is that it prolly doesn't eat up much decay time in the mids and highs.
I just dont see PSI introducing a product that does not work, their monitors are highly thought of.
I will ask Roger Roschnick.
Keith.
I will ask Roger Roschnick.
Keith.
dallasjustice
Major Contributor
NorthSky
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Oh this is a cool link, and gratis.
Now that you're done, have you lost interest yet?
dallasjustice
Major Contributor
Lost interest in what? I could improve the step response a little more. I'm thinking about getting another stereo amp and time aligning the JBL woofer with the horn compression driver to make the speakers fully active. It's not a high priority but if the right stereo amp comes along, I might do it.
Oh, you're not done. Nevermind...
dallasjustice
Major Contributor
Have you purchased Mitch's book on DSP and Acourate yet? It's available on Amazon Kindle. It's $10 and well worth it. He goes into a lot of room acoustics science and connects it up with Acourate in a detailed and logical way. It's very helpful. The only problem with it is that all of the examples are from his fully active DIY horn speakers. It's sort of depressing looking at how well his speakers perform.
Oh, what is it called? Inquiring minds want to know.
dallasjustice
Major Contributor
It's very much geared to Acourate users. So you'll prolly want to skip over some parts.Oh, what is it called? Inquiring minds want to know.
https://www.amazon.com/Accurate-Sound-Reproduction-Using-DSP-ebook/dp/B01FURPS40
Lots of JJ references. You'll like it.
Thanks. It is available for free to Kindle unlimited subscribers so I scooped it up!
I'll take a look at the book.
I have AcourateDRC, not Acourate. It doesn't have all the complexities exposed for fiddling, and is dedicated to creating IIR and FIR filters for the miniDSP OpenDRC exclusively.
IIR - biquad filters - do the work on the lower end, and the FIR does the higher frequencies and minimum phase corrections.
Basically, create a target, take a single measurement of both/left/right, pick among two more/less aggressive settings, decide how many of the available IIR filters to use, and press Ok.
From the miniDSP, download the filter and continue.
FIR L/R filter at top, the combination of IIR filters L/R below, sum those together to pretend you can see the final curve, phase adjustment not displayed.
Here's the what you measured and after creating the filter, the what you are expected to get trace.
And the (just now) measured result in REW.
Oh, dipole nasties! Seating position in the worst place! Subs not scattered around the room!
You win.
I have AcourateDRC, not Acourate. It doesn't have all the complexities exposed for fiddling, and is dedicated to creating IIR and FIR filters for the miniDSP OpenDRC exclusively.
IIR - biquad filters - do the work on the lower end, and the FIR does the higher frequencies and minimum phase corrections.
Basically, create a target, take a single measurement of both/left/right, pick among two more/less aggressive settings, decide how many of the available IIR filters to use, and press Ok.
From the miniDSP, download the filter and continue.
FIR L/R filter at top, the combination of IIR filters L/R below, sum those together to pretend you can see the final curve, phase adjustment not displayed.
Here's the what you measured and after creating the filter, the what you are expected to get trace.
And the (just now) measured result in REW.
Oh, dipole nasties! Seating position in the worst place! Subs not scattered around the room!
You win.
Last edited:
Oh, what is it called? Inquiring minds want to know.
Is setting the range of the graph's y axis to 160 dB, and measuring response at only one position in the modal region with 1/12 octave smoothing covered in the book?
Modal region measurements should be unsmoothed and EQ'ed as such, and checked at multiple listening positions.
dallasjustice
Major Contributor
It may better to buy Acourate first before reading the book. I'm afraid it would scare you off. If I had known what I was getting myself into years ago and that years later I would still be learning how to use it, I would have said fuck it, give me another massive bass trap and a bigger amp!
OK, read through the first chapter and had to take a pause when I got to this:
"LEDE is state-of-the-art in acoustic control room design.
Barnett, Mitch. Accurate Sound Reproduction Using DSP (Kindle Locations 220-221). Kindle Edition. "
He is completely wrong here. LEDE is old school and nothing about it is state of the art. It came about in the age of broken studio monitor designs and assumptions about sound reproduction with no controlled testing. Decades of research since has shown the approach to be improper. Dr. D'Antonio who is the founder of RGP (largest manufacturers of acoustic product) puts all of this in great context in one of his presentations:
There it is: 1979 when LEDE (live end, dead end) was invented. Then came formal studies at NRC as highlighted below:
RFZ became the other buzz word as was NE Room as mentioned above. Just as with LEDE, improper methodologies with no controlled testing to validate them.
Then came enlightenment:
To the pinnacle of what we know about sound reproduction in rooms:
The author is old school, having done pro work years back when concepts like LEDE were the rage. As with many people of that era and domain, they still talk about these old approaches as being valid even though it is trivial to show that they are not.
Anyway I will read through the rest of the text but so far, it is not a good thesis for home listeners to follow.
"LEDE is state-of-the-art in acoustic control room design.
Barnett, Mitch. Accurate Sound Reproduction Using DSP (Kindle Locations 220-221). Kindle Edition. "
He is completely wrong here. LEDE is old school and nothing about it is state of the art. It came about in the age of broken studio monitor designs and assumptions about sound reproduction with no controlled testing. Decades of research since has shown the approach to be improper. Dr. D'Antonio who is the founder of RGP (largest manufacturers of acoustic product) puts all of this in great context in one of his presentations:
There it is: 1979 when LEDE (live end, dead end) was invented. Then came formal studies at NRC as highlighted below:
RFZ became the other buzz word as was NE Room as mentioned above. Just as with LEDE, improper methodologies with no controlled testing to validate them.
Then came enlightenment:
To the pinnacle of what we know about sound reproduction in rooms:
The author is old school, having done pro work years back when concepts like LEDE were the rage. As with many people of that era and domain, they still talk about these old approaches as being valid even though it is trivial to show that they are not.
Anyway I will read through the rest of the text but so far, it is not a good thesis for home listeners to follow.
dallasjustice
Major Contributor
Actually Mitch covers multiple seated positions very well in the book from his active 3 way stereo pair. He has lots of better looking graphs for you. Above is a sample. I'll prolly get in trouble with Mitch for posting it.
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