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Thread: the DBX 4800 Auto Warmth feature.

  1. #1
    Senior Member 1audiohack's Avatar
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    the DBX 4800 Auto Warmth feature.

    Hi All;

    I have a DBX 4800 in my home main system and have been digging deeper and working to learn and exploit it's capabilities to the fullest extent. My speaker system is fairly well developed meaning that changes in delay, cross-over points, slopes and EQ bring more negatives than posatives after long term evaluation. This system is taylored to my tastes and I realize that it may not be reference correct in many/any way(s), but it is after all mine, and I am very happy with it. Being however that nothing is perfect, the single largest issue would be that I have two EQ settings for low and high level listening, basically a loudness function to bring up the VLF/LF at low levels, even with two GTI1800's for subs.

    Enter the Auto Warmth insert. This is a threshold adjustable, curve adjustable insert that when properly integrated has absolutely no artificial sounding artifacts, at all. I can't find the words to describe how much of a posative difference this has made in my low level listening enjoyment, this insert alone is worth the price of admission of the 4800. Now, at any level, with any source material, the sound is full. It does not jump in and out, it's invisible and it's just,,plain,,, perfect. Sorry to gush! You just gotta try this thing!

    There are at least two others here with 4800's, are you utilizing the Auto Warmth insert?

    Alll the best,
    Barry
    If we knew what the hell we were doing, we wouldn't call it research would we.

  2. #2
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    I have an dbx 4820 incoming, and I can't wait to try this feature. If it works, this is exactly what I have been missing.
    Barry, what settings do you recommend for it?

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    Senior Member 1audiohack's Avatar
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    I still love this feature as much now as I did three years ago!

    The 4800 is now in use with my 4350 system and even with woofers as capable as the 1501-1Al's this feature is phenomenal. I am away from home for two more days but when I get back I will report it's current settings.

    I wish they would build this into their other processors including BSS and I-TECH. The DBX Zone-Pro's have a version with less adjustability that I haven't yet used.


    All the best,
    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

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    Ok, thanks.

  5. #5
    Obviously... not a golfer grumpy's Avatar
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    was thinking about how to do this and then found...:

    http://harman-hsp-web-assets.s3.amaz...l_original.pdf
    It's uh... uh... it's down there somewhere, let me take another look...

  6. #6
    Senior Member 1audiohack's Avatar
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    Thank you Grumpy;

    That is sensible.

    I was trying to figure out how to accomplish this via limiting without being destructive to the overall sound quality and gave up.

    Explore this I will.

    Thanks again,
    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

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    What values do you use for "Threshold" and "Amount" in the AutoWarmth-settings Barry?

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    From the Manual:

    Threshold fader
    The Threshold sets the level at which AutoWarmth begins to work. Signals below the Threshold are pro-cessed to increase the Bass response in proportion to the overall volume of the signal. Above the Thresholdthere is no processing. The Threshold meter will light green when the threshold has been crossed andAutoWarmth is active. The Threshold range is between -60 and 0 dBFS. To set the Threshold, turnAutoWarmth off and adjust the Master Gain to the desired listening level. Turn AutoWarmth on andadjust the Threshold until the Threshold Meter is toggling on and off. Now as the volume decreases belowthe Threshold, the bass will gradually increase. Be careful when using AutoWarmth followed by an AGC.The AGC can add gain when the signal is below the AutoWarmth threshold resulting in overcompensatedBass.
    Amount fader
    The Amount parameter controls how much bass is added. A setting of 1.00:1 compensates for the per-ceived loss of bass by inversely matching the Fletcher-Munson Equal Loudness curves. Higher settings(greater that 1.00) cause more bass compensation; lower settings result is less bass compensation. TheAmount parameter is adjustable between 0.25:1 and 4.00:1.

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    I wonder how high up in the frequencies it is working? Should I add autowarmth to both woofer and horn channels (800Hz crossover), or only woofer?

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    Senior Member 1audiohack's Avatar
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    Quote Originally Posted by bubbleboy76 View Post
    What values do you use for "Threshold" and "Amount" in the AutoWarmth-settings Barry?
    I will get you these values today, sorry to have forgotten.

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  11. #11
    Senior Member 1audiohack's Avatar
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    I wrote it all down and left my note at home, but here is what I think I remember:

    Just a note, this 4800 is on the 4350's so there are four 15's.

    Ratio is 1:1

    The channels for the 1200Fe's are at -50dB

    The channels for the 1501Al-1s are at -45dB

    Absolutely magic.

    All the best,
    Barry.

    P.S. If I find my note contradicts my memory, I will revise this post.
    If we knew what the hell we were doing, we wouldn't call it research would we.

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    Thanks, it was the ratio I was most interested in. The treshold is very specific to the gain structure of the system. I am at -24dB now after setting it up according to the instructions in the manual.
    My initial tests are very promising

  13. #13
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    You have 4350's with 1200fe's and 1501Al-1s? That is far down the rabbithole!
    Do you have a thread describing your systems?

  14. #14
    Senior Member 1audiohack's Avatar
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    Yeah I took the red pill and am still going in.

    I don't think I ever started a thread on that project. It kindof evolved over the plight of a pair of forlorn empty cabinets for sale in Cananda. I will see if I can find it. The story on them is not finished.

    They are going to loose their -1's for a pair of plain old 1500Al's though pretty soon. They have a new home in a pair of those beautiful Maple Everest cabinetes from Hornslet.

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  15. #15
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    Haha.
    I would love to see a pic from your part of the Hifi-Matrix.

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