Confususion with SUB OUT setting...

Beantwortet

Jason Collier

• 18. Februar 2021 18:04

If someone will be sending a sub signal out via the RCA "SUB OUT" on the back of a Node 2i, why the crossover setting at all ???  An external power subwoofer will have its own setting for the XOVER at the sub.  I want to set my sub out lower than 40hz - but this is the lowest setting. 

Also... I just hooked this up and I am getting some very low output from the sub when it is turned "ON" in settings, but when I turn the sub out to "OFF", it gets noticeably louder.

What is going ion here?

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  Jason Collier

  • 18. Februar 2021 18:16

  We simply want to be able to turn the signal to the SUB OUT on or off, that's it.  Why introduce a XOVER to the main RCA outputs at all?

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  Rodger

  • 18. Februar 2021 21:51

  Hi Jason,

  There's always a signal being sent to the sub signal output jacks, you cannot disable it. I would like to see this "Sub Out" setting renamed to "Enable crossover" or something similar to make it more obvious what it's actually doing.

  I don't work for Bluesound but in my reading, this behavior is part of the Dolby certification requirements. For various reasons, Dolby requires a separate Low Frequency Effects LFE channel (sub out) but also requires that the LFE signal can be sent to the two front speakers if they are "full range". So all Dolby certified systems have an option to specify your front speakers are full range or limited range. In BluOS, when you set the Sub Out setting to OFF, it disables the crossover and it's the same as saying your front speakers are full range.

  In my tests, the BlueOS crossover attenuates the sub signal a few dB. That's why it's louder when the crossover network is enabled. The crossover is very useful when driving bookshelf speakers like I do sometimes.

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