Inter-M QD4960 PA-amp sounds weird

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Xenon-Codex
    Senior Member
    • Jan 2018
    • 185
    • Finland
    #1

    Inter-M QD4960 PA-amp sounds weird

    Is it normal that this 4-channel amp sounds different by every channel? All channels work, but the sound is bassy, has weird echo, or dip at vocal freq's.
    I made a test cable which puts identical signal to every channel.
    I don't see any kind of processor in the schematic.
    Attached Files
    Last edited by Xenon-Codex; 08-20-2020, 10:50 AM.
    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • Loki_Fido
      (Weird) BIOS info for HP Pavilion Aero 13-be1021AU
      by Loki_Fido
      Hi folks,

      This HP Pavilion Aero 13-be1021AU came to me for a repair. And it seems to have a weird BIOS chip. (Pic attached)
      I asked my CH341A to read it and doesn't even know what to do with this. We are both very confused.

      BIOS - XMC 25RU128CH10 (1.8v)

      What the heck is this? I looked all over the MB. This is the only bios.
      When I asked the NeoProgrammer to detect it, it just pops up an empty screen, and asked me to enter the bios number. And when I did, it doesn't do anything. NeoProgrammer showed me just this SPI ID: 204418. Don't know what...
      2 Photos
      03-20-2025, 01:57 AM
    • ugamazing
      820-02020 Super Weird Issue: Keyboard Input Character Map "Wrong"?
      by ugamazing
      So, I have a really bizarre issue that I'm struggling to identify the cause of. Working on an 820-02020 board with some bizarre keyboard/input-source character mapping. My suspicion is a possible damaged SPI ROM (U1970), perhaps, but I'm really not sure in this case:

      1. The issue is pretty weird, but when installing MacOS, I noticed my WiFi password did not work. I quickly realized the special characters (!@#$%^& etc) were not mapping correctly.

      2. I noticed the keyboard layout/input-source is defaulting to JAPANESE every single time I restore the board. I am not...
      04-10-2024, 08:06 AM
    • lukkihapsi
      Asus Vivobook X515JA Weird Boot Issue
      by lukkihapsi
      Asus Vivobook X515JA Laptop
      Issue :
      Upon turning laptop ON, screen lights up - stays black & about 30+ minutes later ASUS logo is shown & boots to windows, then laptop works fine.
      Tried :
      Cleaned inside for dust, applied fresh thermal paste. No Change!
      Removed keyboard, Trackpad, fingerprint sensor. No Change!
      Removed Internal SSD. No Change!
      Updated BIOS to latest version. No Change!
      Removed battery and pressing power button for 1 minute. No Change!
      Weird Part :
      Upon turning laptop ON, screen lights up - stays black,
      I...
      07-07-2025, 12:07 PM
    • lordmmx
      Lenovo Legion 7 16ithg6 NM-D721 weird behavior
      by lordmmx
      Hello guys,

      I have recently aquired Lenovo Legion 7 16ithg6 NM-D721, with weird issue. From time to time it will POST fine, boot to windows and work without a single issue. After restart however, it will not post again and then it will not post at all.

      After messing around with bios (reflashing it), removing ssd, wifi, battery, etc, none of helped, I checked 5v and 3.3 coils and to my surprise, multimeter showed both coils hovering around 4V for 5V coil and 2V for 3.3v coil.

      Thermal camera did not showed anything hot, but I'm sure something is either going...
      06-30-2025, 03:54 PM
    • dreamlayers
      Weird clipping on Logitech Z-10 speakers
      by dreamlayers
      I bought used Logitech Z-10 computer speakers. They can act as a USB audio device or accept line input, and they have a headphone output jack. Some music didn't sound right, so I played a frequency sweep and heard other frequencies and beat frequencies between them and the sweep. I uploaded a spectrogram of a frequency sweep. From the very start, some but not all odd harmonics are visible, indicating symmetric distortion. Then at higher frequencies there are descending images of those harmonics, indicating non-linearity and constant higher frequency noise mixing with the harmonics. The image of...
      Frequency sweep spectrogram
      2 Photos
      05-22-2025, 11:41 AM
    • Loading...
    • No more items.
    Working...