3. MP573 - No low end
« previous next »
Pages: [1]

Author Topic: MP573 - No low end

September 05, 2023, 11:48:32 AM
Read 951 times

viktor.bom

  • Newbie
  • *
  • Posts: 2
  • Karma: +0/-0
    • View Profile
MP573 - No low end
Hello! 

I've had a pair of MP573s for some months now and I love them! They were both working fine for a while but now one of them has lost all its low end. I tried going over the solder points but it didn't change anything. Any recommandations on what to do from here?
Logged
September 06, 2023, 10:28:16 AM
Reply #1

JPK

  • Administrator
  • Hero Member
  • *****
  • Posts: 1117
  • Karma: +37/-0
    • View Profile
Re: MP573 - No low end
Can you check the input DC resistance: ohmmeter between pin2 and pin3 of input XLR, power on, Z switch on 1200. Should read about 48 Ohms.
Next check the output DC resistance: ohmmeter between pin2 and pin3 of output XLR, power off. Should read around 42 Ohms.
Logged
JPK
September 07, 2023, 12:44:08 PM
Reply #2

viktor.bom

  • Newbie
  • *
  • Posts: 2
  • Karma: +0/-0
    • View Profile
Re: MP573 - No low end
I am getting 50 ohms on the input and 41 ohms on the output
Logged
September 08, 2023, 10:36:42 AM
Reply #3

JPK

  • Administrator
  • Hero Member
  • *****
  • Posts: 1117
  • Karma: +37/-0
    • View Profile
Re: MP573 - No low end
These are good.
Check the solder joints of the input transformer pins and of the daughter board to main board connections.
Next try to follow the signal like said here: https://www.soundskulptor.com/forum/index.php?topic=5.msg5#msg5
Logged
JPK
Pages: [1]
« previous next »
  3. MP573 - No low end