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MrSkippyJ

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Posts posted by MrSkippyJ

  6. Sub clipping after setting gains - SMD DD1

    in SMD Distortion Detector (DD-1) Topics

    Posted

    On 11/24/2021 at 10:30 PM, Big Tex db said:

     

    Everything is flat after tuning except 80hz LPF on HU.  Bass knob is set to max when setting gain on amp.

     

    I can hear the sub burping, or sputtering.  It makes a repeated thud/pounding noise.  As if it's bottoming out or being stopped repeatedly.  I assume this is clipping/distortion from too much gain.

     

     

    when do you hear this? Does it change with volume?

  14. 2019 Toyota Camry

    in SMD Distortion Detector (DD-1) Topics

    Posted · Edited by MrSkippyJ

    I just went and read some of the instructions for your LOC. Turns out it isn’t a LOC at all really. Your headunit doesn’t have an output at all really. All it does is send a message to the amp and tells it what to do. That’s where the PAC AmpPRO intercepts the message and turn it into audio. There is no conversion from high to low level. Still doesn’t explain why you didn’t get a signal but very much explains why you can turn the head unit up to max with no distortion. 
     

    And then your amp...lots of settings in side that thing.

     

    Start playing around in the amp’s settings (with no speakers hooked up) until you get a signal on the DD-1 to see what is going on. You have so many controls on the amp I’m guess one of those is the issue. It doesn’t appear the the PAC device has any output adjustments except to shut off the factory EQ.

  17. 2019 Toyota Camry

    in SMD Distortion Detector (DD-1) Topics

    Posted · Edited by MrSkippyJ

    You can check everything with the probes of the DD-1 plugged into the amp outputs. Zero reason to check everything at each point.

     

    • Set the amp and LOC gain all the way down
    • Then check max clean output of the headunit at the amp with the 0db track (which very well could be max).
    • Then with the headunit at that volume setting and using the 0db track turn the LOC gain up until you get distortion.
    • Then do the amp using a -5 or -10db track.

     

    Done. Super simple, don't make it more difficult than you need too. 

  18. 2019 Toyota Camry

    in SMD Distortion Detector (DD-1) Topics

    Posted

    no shit you can do it like that. he said he did that. He was confused why that way showed no distortion all the way up at 62 but at the amp it showed distortion sooner at 49. So I suggested the other way to check the head units distortion that is also mentioned in the DD-1 instructions. What's important is what is coming out of the amp. If it says it's distorting at 49 then that is the level you use. 

  19. 2019 Toyota Camry

    in SMD Distortion Detector (DD-1) Topics

    Posted · Edited by MrSkippyJ

    If it was me in this case, I would check everything at the speaker outputs of the amp. Use the 0db test tones to test everything in line prior to the amp, then use the either the -5,-10, or -15 tracks (probably the -5 or -10) to set the output of the amp. Just make sure the gain is as low as possible when checking everything upsteam of the amp. Making sure the headunit output is as clean as possible is possibly the most important thing. 

  21. 12 Channels (edit 16!) of pure Audiocontrol home audio delight! Maestro X9! Pantages G4, Savoy G4, Avalon G4 amps (Klipsch speakers) 9.2.4 surround!

    in Just Meade....my projects - Tons of SMD Builds here!

    Posted

    Klipsch is nice stuff, can’t stand their subs personally though! But those 820s are the shit. Can’t say I have ever heard audio control home stuff but I’d be shocked if they were less than amazing. That’s going to be intense when it’s done, a lot of speakers in a tiny space!

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