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DEQX Premate 8 digital active crossover / DSP

DEQX Pty Ltd Announces Expansion​

DEQX is expanding with some more audio legends!​

27TH NOVEMBER 2024, Sydney Australia

We are excited to announce the addition of several award-winning audio pioneers to our team.
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Joseph Narai – Chief Operating Officer
Joseph started with us part time as R&D Manager in February this year and joined full time as COO in July. Joseph, a seasoned technology innovator with over 35 years of experience, has held prominent leadership roles having founded multiple audio companies over the last three decades. His achievements include multiple design and industry awards including the Innovation in Media Award from the National Association of Broadcasters in the USA.
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Chris Alfred – Chief Technical Officer
Chris joined us as CTO in July this year. He is a technology innovator with extensive experience in embedded programming and audio device development. Starting his career with our CEO Kim Ryrie at Fairlight in 1990, Chris has significantly contributed to digital audio editing for motion picture post-production, earning an Academy of Motion Picture Arts and Sciences, Scientific and Engineering Award in 2004.
Research Science Partners: Dickins Audio and Aurisium
We are also thrilled to announce our partnership with Dickins Audio and Aurisium, leaders in the audio technology industry.
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Christophe Chabanne, CEO of Aurisium, brings extensive experience from his 22-year tenure at Dolby, where he co-invented Dolby Atmos. Christophe's efforts led to the standardization of Atmos at the ITU and earned him prestigious accolades including a 2024 Academy of Motion Picture Arts and Sciences Scientific and Engineering Award and a 2021 Primetime Emmy Award.
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Glenn Dickins, CTO of Dickins Audio, has a rich background in Spatial Sound with extensive credentials, including over 120 patent families. Previously at Dolby as Lead of Research, Glenn was a key contributor to groundbreaking projects such as Dolby Headphone, ATMOS and VOICE.
Welcome
We are absolutely thrilled to welcome these distinguished professionals to our dynamic team, which already includes the incredible talents of Kim Ryrie, Dean Cooper, Alan Langford, James Murchison, Larry Owens, Luke Dearnley, and Gabriel Santos. Together, with our combined expertise and dedication we are excited about taking DEQX to new heights of innovation and excellence.
Now I know why their products are so expensive.
 
Hi, does anyone have any info on the use of the “Trim” adjustment? Somehow I feel this is related to gating, but not sure. Any advice on how and when to use? Thanks
 
After some waiting I have been starting to use my Pre-8, very intensive last two weeks.

Some Trouble:
-A alot of "snapping" / crackling sounds, dont know the english word. Sometimes its not even possible to listen and sometimes if I start on low volume and keep it like that there are no such sounds for hours.
If I then play loud for a while the very irritating sounds starts and they dont go away even on low volume.
Anyone alse experience the same?

-Para-eq lives it own life, it often changes the q value. I havnt really figured out when and why yet.

I hope it goes well for Deqx so we get a finished product, this Beta stege is a little painful in many ways.

On the positive side.. now my sound is fantastic! I have been working with my many different homebuild active systems for soon 20 years and quite quickly with the Pre-8 it sounded better than ever before with a large margin :) Im not good at describe how it sounds but im very very happy so far! I guess it can be even better.

Hi, does anyone have any info on the use of the “Trim” adjustment? Somehow I feel this is related to gating, but not sure. Any advice on how and when to use? Thanks
I dont know what it means in this case, have you tried anything?

It seems very important/have big impact how you do the "create a speaker" measurement.. I have tried a lot of different way but placing the mic in the listenig position seems best so far.

Anyone else that have found out good ways to do things?

//Theo
 
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Yes I have !
I think thats importent that you meassuring the speakers there direct sound .
So not with too much room influence , but that depens of the room And how far the listening position is from the speakers.
In my case I meassure halfway .
I have a roommode on the listening spot wich I have meassure with REW And make a notch in the EQ page .
Sounds great And verre lifelike And spatial .
 
Who is this guy?
He doesn't understand what reverberation is. What he calls reverberation seems to be comb filtering. Reverberation is something completely else and they shouldn't be mixed.
I dont know him, but DEQX uses him as a guide to learn the new pre8 anyway. (links to his videos in the pre8 manual).

Could you please explain the "trim" better than him? I have played around a little with it but cant say I fully understand it yet. Any help is great :)
 
I think their choice of terms "trim" and "reverberation" is unfortunate. If he said "unwanted reflections" instead of "reverberation", it would be more accurate.

In this context, "trim" refers to "cutting" or "cropping" or "snipping". Other software calls it "curtain" or "gating" or "windowing". I'll explain it like this: DEQX sends a sine wave sweep to your speakers, and then it waits and listens for the signal to emerge from the speaker. The first thing it hears is the direct sound from the speaker - this is because it has the shortest path from speaker to microphone. If it waits a bit longer, it will start to hear reflections. Reflections are always delayed with respect to the direct sound because they travel a longer path from speaker to microphone.

At some point, we want to remove the reflections. Hence all the different terms. "Gating" means we shut the gate after a specified time. "Window" means we leave the window open for that amount of time. "Trim" means we snip off any sound that arrives after a certain time. They all refer to the same thing. Henceforth I will refer to it as "window".

The important thing to realise is that the time window is frequency-dependent. One period of 20Hz is 1/20s = 50ms. One period of 20kHz is 1/20000 = 0.05ms. If you leave the time window open for 50ms, you will capture 1000 cycles of 20kHz and a heck of a lot of reflections. So most software allows you to do frequency-dependent windowing (FDW) - where you keep the window open longer for low frequencies, and shorter for high frequencies. We can think of window length in terms of time (milliseconds) or cycles. I prefer to think about it in cycles, it's easier.

I saw that video and found it a bit hard to believe that DEQX only lets you specify one window setting for the entire 20-20kHz frequency range. I hope I am wrong about this because it would be a major limitation otherwise.
 
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