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AES/EBU input flashes red

jappi, muokattu 5 Vuodet sitten.

AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Hi, I'm using 8250A AES3 input from fixed sample rate 172/192kHz (88/96kHz won't make any difference) with GLM2.0 and volume control. In high dynamic parts (i.e. bass drum or dynamic vocals) the leds blink red. GLM volume level doesn't affect this (blinks with 0,0dB and -120dB, obv. haven't tried even close to 0dB, but I assume it does:). In the sound itself I cannot hear any distortion. Do I have corrupted AES/EBU signal or faulty speakers?

I'm using s/pdif output with Neutrik BNC/XLR 75 to 110 ohm impedance transformer (connected directly to the speaker). Cables are relatively short (Input from player is 3m, AES/EBU between speakers is 5m).

Edit: Checked source by switching to another player. Similar behavior on different albums though. Noticed that some songs blink less than others. Some don't at all. Could it be because of output level difference or/and audio compression levels?

Any idea what's the problem and how to fix?
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Just came to my mind that is it possibly signal level issue? But then why would it affect in the dynamic parts of the signal?

Should I try active s-p/dif - aes/ebu converter?
1038, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Jedi Master Viestejä: 340 Liittymispäivä: 6.4.2009 Viimeisimmät viestit
The red LED indicates a few different situations, in your case it may be that the incoming signal is at 0dBfs.

This can be because the track you are listening to was recorded with digital clipping... hence the light still flashing at -120dB in GLM.
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
The red LED indicates a few different situations, in your case it may be that the incoming signal is at 0dBfs.

This can be because the track you are listening to was recorded with digital clipping... hence the light still flashing at -120dB in GLM.


Ok, that might be. As I'm not recording engineer I don't know how often digital clipping occurs. But on some records flashing occurs rarely if at all. But in some it's almost continuous.

Anyway it's very annoying. And I don't know if it's dangerous to the speakers as well? Since I'm inputting s-p/dif level signal 0,6V instead of aes/ebu 7V the input itself shouldn't be overloaded?
ilkka-rissanen, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Hi,

It is not dangerous to the speakers at all, it is just a indication. Unfortunately there is no way to change this behaviour other than choosing to listen properly mastered songs without digital clipping. :)
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Hi,

It is not dangerous to the speakers at all, it is just a indication. Unfortunately there is no way to change this behaviour other than choosing to listen properly mastered songs without digital clipping. :)


Hi Ilkka,

So using powered s-p/dif to aes/ebu converter with proper voltage level instead of passive wouldn't help at all?

It seems that most of the songs are not properly mastered... :) Is there any chance that there might be technical issue with my monitors? Is there a way to verify that it certainly is only digital clipping issue (i.e. checking the song with software)? At the moment speakers are still under warranty... :)
ilkka-rissanen, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Converter won't do any difference because the "problem" is already in the original signal, it's not about a mismatch or level between the source and the monitor.

You can easily check your songs with any typical audio software (even freeware like Audacity). If you see peaks that reach 0 dBFS, you know that it's the reason for those red blinks.
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Converter won't do any difference because the "problem" is already in the original signal, it's not about a mismatch or level between the source and the monitor.

You can easily check your songs with any typical audio software (even freeware like Audacity). If you see peaks that reach 0 dBFS, you know that it's the reason for those red blinks.


Ok thanks. I will check. I also noticed that there has been similar issues reported with 82xx-series several years ago. Is this "problem" fixed in 83xx series?
ilkka-rissanen, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit

Ok thanks. I will check. I also noticed that there has been similar issues reported with 82xx-series several years ago. Is this "problem" fixed in 83xx series?

It is not a problem or error in the monitor, it is a designed feature which helps the audio professionals. By blinking the red light, the monitor notifies the sound engineer if the digital signal level is being clipped and he/she needs to turn down the level.

We do not want to disable this feature but we can fine-tune how sensitive it is to clipping i.e. how many clipped samples are needed for the red LED to lit. A firmware update is required for the monitors. I will get back to this soon.
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Yes I think that is the reason. Any news on FW update?
ilkka-rissanen, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Yes I think that is the reason. Any news on FW update?

Not yet but I will keep you updated.
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Any news Ilkka?
ilkka-rissanen, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Hi,

Please download the GLM 2.2.0 build 93 and update firmware of each loudspeaker. The clip indication function has been fine-tuned so that it does not indicate clip unless the signal is truly clipping.

viewtopic.php?f=3&t=2733
jappi, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Padawan Viestejä: 36 Liittymispäivä: 28.7.2016 Viimeisimmät viestit
Thanks Ilkka! Does new FW have other improvements?
markus-kahelin, muokattu 5 Vuodet sitten.

Re: AES/EBU input flashes red

Jedi Knight Viestejä: 109 Liittymispäivä: 16.3.2010 Viimeisimmät viestit
Hi!

New firmware has always overall network stability and performance improvements for the GLM software platform.