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  1. #1
    Junior Member
    Join Date
    Aug 2018
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    7

    Please Help. PCP-Kali-piano 2.1 dual mono channel imbalance

    I recently received a Allo kali and piano 2.1. Getting up and running has been no problem, however, I cannot run dual mono without a significant channel imbalance between left/right volume noticeably shifting the image.
    I have used pcp 3.5 audio optimized and 4.0 audio RT kernel,,,and with a pi 2 and a pi3b+...and different sd cards.
    If I run dual stereo each dac is balanced stereo although Dac A stereo outputs are also measurably louder than dac b's (sub) stereo outputs.
    If I ssh into alsamixer I can see that the master volume as well as digital/sub volumes show to be same /identical.....I am a bit defeated does anyone have any experience-suggestions
    Thx in advance

  2. #2
    Senior Member paul-'s Avatar
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    Jan 2013
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    1,770
    I normally run this card everyday.

    Are you using the correct Piano driver? You want the Allo Piano Dac plus 2.1/2.2. Are you setting this through the card control screen? When in Dual mono mode, which RCA jacks are you connected too. Should be using the far left and far right jacks.
    piCorePlayer a small player for the Raspberry Pi in RAM.
    Homepage: https://www.picoreplayer.org

    Please donate if you like the piCorePlayer

  3. #3
    Junior Member
    Join Date
    Aug 2018
    Posts
    7
    yes, driver is correct piano plus 2.1/2.2 as set in the card control and I am using the correct outputs left and sub right...the audio is there but with a volume imbalance left louder than right (sub)
    As stated even when running dual stereo while each individual stereo pair is in balance if I measure the output from dac a stereo outputs it is louder than dab b ( sub) stereo outputs...wondering if a have a problem Kali 2.1 board
    Thx

  4. #4
    Junior Member
    Join Date
    Aug 2018
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    7
    Paul..quick thought could you tell me (or screen shot)your settings in advanced Squeezelite and card control to make sure I donĺt have something else wrong, missing
    Thx

  5. #5
    Senior Member paul-'s Avatar
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    Jan 2013
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    I just ran through some tests, as I forgot how the card worked. When in dual mono mode, if you use alsamixer, be sure not to play with the subwoofer volume control.....as that will override the Master, and mess up the right volume. Be sure to only use Master. And also don't take the Master volume above 0db......which you can in alsamixer.

    Here is my setup. I'm not currently using my Kali, Since you are running the Kali, you need to check the glb_mclk option.

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    piCorePlayer a small player for the Raspberry Pi in RAM.
    Homepage: https://www.picoreplayer.org

    Please donate if you like the piCorePlayer

  6. #6
    Junior Member
    Join Date
    Aug 2018
    Posts
    7
    Thx much, how about of your Squeezelite advanced settings, ( buffer, harfdware, priority, other controls, rtc)

  7. #7
    Senior Member paul-'s Avatar
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    Jan 2013
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    1,770
    I just use the default settings.
    piCorePlayer a small player for the Raspberry Pi in RAM.
    Homepage: https://www.picoreplayer.org

    Please donate if you like the piCorePlayer

  8. #8
    Junior Member
    Join Date
    Aug 2018
    Posts
    7
    Aok...thx again

  9. #9
    Junior Member
    Join Date
    Aug 2018
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    7
    As one last try I downloaded and wrote both volumino and picoreplayer 4.0RT images on a neighbors desktop pc.....SOB, both worked completely normal in dual mono and has been stable over the last 12 hours
    It appears that even though I am getting no download, checksum error or file corruption on my pc that has been used extensively for these purposes in the past ( including recent past) I have something going on with this pc in downloading and writing images onto sdcards.....at a loss as to what is going on to break the images in a way that is not generating any message/notification but will resolve it
    But these new images from different pc are working normally, at least if I leave all default settings besides for selecting driver, gd-blck and dual mono settings. For the moment, I am a little gun shy in messing with any other settings in Squeezelite advanced 😊
    Thanks much to all who has offered assistance...as always a learning experience

  10. #10
    Senior Member Greg Erskine's Avatar
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    Sep 2006
    Location
    Sydney, Australia
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    1,619
    hi LanceL,

    Very strange! Burning an SD card is so simple its hard to imagine where something could go wrong.

    Here is the procedure I have used on a couple of Windows PCs, hundreds, probably a thousand times now without issue. Lucky pCP is so small it takes less than 10 seconds to burn!

    https://www.picoreplayer.org/how_to_..._sd_card.shtml

    I have had one faulty SD card, I broke one, and one SD to uSD adapter plays up. These resulted in go/no go results not corrupted images.

    Please let us know what the cause is if you find it.

    regards
    Greg

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