Welcome, Guest
Username: Password: Remember me
NOTE: This is a "Community" forum. Please be mindful that community members are here to help as part of a community effort. We therefore appreciate your effort in keeping this forum a happy place!

If you have a specific issue (e.g. hardware, failure) and want help from our support team, please use our tech support portal (Support menu - > Contact Us).
Thanks a lot of your help in making a better community.
  • Page:
  • 1

TOPIC:

Balanced Flex Gain 4 months 4 weeks ago #61136

  • federicos
  • federicos's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 3
  • Thank you received: 0
I have measured with th oscilloscope the input-output of a sine wave in the balanced Flex
with all parameters on 0 db  (input gain, output gain, main volume gain) the output sine wave is lower than input wave. With gain  put on +6db output matches input, is this normal ?

Please Log in or Create an account to join the conversation.

Balanced Flex Gain 4 months 4 weeks ago #61139

  • dreite
  • dreite's Avatar
  • Offline
  • Platinum Member
  • Platinum Member
  • Posts: 1656
  • Thank you received: 739
I suspect you're losing 6db in your measurement scheme.
Maybe your input is unbalanced (via an adaptor) and half the voltage you think it is????

Dave.

Please Log in or Create an account to join the conversation.

Balanced Flex Gain 4 months 4 weeks ago #61140

  • federicos
  • federicos's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 3
  • Thank you received: 0
i inject  in the input an unbalanced sinewave between ground and hot pin and i measure at output between hot pin and ground so o inject unbalanced but i also measure unbalanced, do you think the scheme is wrong ? unfortunately i don't have a balanced sine wave generator, but i think you are right, perhaps in this way i inject half and measure  half so output is 25%

Please Log in or Create an account to join the conversation.

Balanced Flex Gain 4 months 4 weeks ago #61141

  • federicos
  • federicos's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 3
  • Thank you received: 0
Yes definitely you were right, i changed measurement scheme, i managed to inject a balanced sine wave connecting another balanced preamp with usb connection with the laptop connected so to let the preamp  generate a balanced sine wave with his dac, now minidsp flex  input equals output with all parameters at 0 db, thank you very much, i'ts the first time i'm handling with balaced connections, up to now i have to remember that hot and cold inputs are always summed.

Please Log in or Create an account to join the conversation.

Balanced Flex Gain 4 months 4 weeks ago #61143

  • dreite
  • dreite's Avatar
  • Offline
  • Platinum Member
  • Platinum Member
  • Posts: 1656
  • Thank you received: 739
Good deal.

Whenever testing and you find yourself losing 6db (or gaining 6db) unexpectedly, it's almost always related to a unbalanced/balanced conversion not accounted for.

Dave.

Please Log in or Create an account to join the conversation.

  • Page:
  • 1