TOPIC:

Hello!
Yesterday I tried to use my 2 subwoofers (Paradigm seismic 110) with my SHD, using the digital coax out and a DAC. 
And I of course realise that it was not possible beacause the signal is the same as the analog out.... so 2x three way ils not possible with the SHD unfortunately. (I think everybody knows)
But I have an idea I I would like you to say me if I miss something.
I don't like Volumio a lot and I really prefer Bluos.
What about to connect my 2 subwoofer with (the full range) rca out of a Bluesound node? And the digital coax out of the node an  SHD digital input.
High pass on the SHD set at 80Hz for exemple for the Woofer, and set directly the low pass on 80Hz on the subwoofer!?
For sure I'll have to take care with the time delay of the sub vs the woofer but with a good position and some close physical measurement, I think no problem at those frequencies...
What do you think about that?
Thank you !
Didier

 

...and you use blusound node to control volume yes? And when you change volume on the node that definitely changes volume of the digital out right? If so, it sounds like it would work but you've lost the ability (as you've identified) to add HP/LPF for the mains-sub or any delays for the subs via the SHD. But if the BN only has L and R analogue out and these aren't mino you'll have to use sterro subs. Or if subs accept L+R inputs you'll need Y-Splitters on the back of the BN unless it has dual L+R outputs. 

The main potential issue is the time delay (latency) introduced by the DSP on the SHD, which is about 25 ms I believe. You'd be able to increase this delay further using the SHD plugin but you couldn't decrease it. 

What subwoofer do you own @Dinky? If it's a sub that includes DSP of its own then this may cause some compensatory delay and it may also have the ability to introduce an adjustable delay too. (My PSA sub cant introduce up to a 16 ms delay for example.) Another consideration is how the distance of the sub from the main listening position may differ from that to the main speakers.

@Dinky I got an e-mail alert showing a reply you'd posted but weirdly it's not showing here?

Ultrasonic impossible for me to post

Yes  I'll necessary have to control volume via the Bluesound node. I'm almost sure that the volume simultaneus changes on both output. (I have to confirm before I buy it)
As I wrote, In the SHD, my idea is to high pass the woofer of the main at 80Hz.
And on the Active subwoofer, to set the crossover at the same frequency. (with the same filter which is an LR24)
I have two subwoofers so, one for the right and one for the left, close to my main speakers.
To my mind the main problem is delay betwen woofer and subwoofer and possible latency due to the DSP .
For the delay, I unfortunately don't have the possibility to manage it in the sub.
Maybe the best solution is to have physicaly the same distance with the microphone....?
Anyway, not sure of the audibility at 80Hz..

Ah good, your post is showing now  .

See my post above re. latency. It's certain not possible, and having the subs the same distance away as the main speakers won't solve this. Actually the further the subs are away the less the time difference will be but you really want to be positioning your subs where they give the best bass response. 

Re. audibility there are two different things. Whether the signal from subs and mains speakers are in phase at the listening position is absolutely audible. Worst case they are totally out of phase and cancel each other out Best case they're perfectly in phase add together perfectly. Reality will be somewhere in between and you can use the delay on your SHD to optimise this. What you'll end up with though is the signal from your subwoofer arriving ballpark 30 ms before that from your main speakers and this is where the question of audibility comes in. And a delay this big is not something I've not experienced to be confident about.