This sounds like a volume slider in your audio options is set to a value other than 100.  Please double-check that.  If that doesn't work then check that your Windows audio volume for Warframe is set to an acceptable loudness.  This can be found in your system tray while the game is running.  Another thing to check would be to make sure your system is using the proper audio sound card.  This can be seen in the Audio Options as well (Audio Output Device).

Thanks for the reports... this will be fixed soon.

Thanks for the report, we'll take a look.

We have a fix incoming for this.

Thanks for the reports, we will take a look.

We'll take a look.

Thanks for the report, we'll take a look.

Thanks for the report, we'll take a look.

Thanks for the report, we will take a look.

Please make sure that the "Transmission Volume" slider in the audio Options is set to 100% on.  Also, you can try switching the transmissions from the PS4 controller speaker to your normal speakers to see if that helps (also in audio options).

On 2020-01-06 at 4:47 PM, Iceyspy said:

Can we just have a " Turn off all transmissions " option already?

Really annoying getting redundant info in missions as a long-time player, especially when it's more DISTRACTING than helpful...

This is already available in Audio Options->Transmissions volume slider

On 2020-01-06 at 5:16 PM, Sean said:

A "Disable All Non-Important Transmissions" option would be amazing, could even have a separate sub-option to allow a line to be played just once so the player can at least hear it before it never gets played again. (This would definitely also apply to the login reward dialogue and syndicate menus).

This is available in Audio Options->Enable Hint Transmissions.  Though most of Cy's haven't been added to this toggle yet.  However, this will work for the more common game-wide Lotus transmissions.

We haven't encountered this, we will take a listen.  Thanks for the report.

We will, yes.

We have some tech that we are currently working on that will help improve the way transmissions are played and prioritized... stay tuned.

Thanks for the report, we'll take a look.

Thanks for the report, we'll take a look.

Thanks for the report, we will take a look.

We have not encountered this, but will take a look.

Thanks for the report, we'll take a look.

Yes, this will be fixed in an upcoming hotfix.