[PROBLEM] Analog input in multiroom.

[Hamimoode]

The Multiroom Sender supports the following sources:
- MPD
- Bluetooth (inbound)
- AirPlay
- Spotify Connect

Line-in from a device like DAC+ ADC is not supported.

Hello Tim, thank you for your post. I search a way to get my music from my receiver over multiroom to the other rooms of my house. I thaugt that the DAC+ ADC pro could be the right way but now i see that I was wrong. Perhaps  I should try Bluetooth. 

It might work if the RN600 can successfully connect via Bluetooth to moode.

Well, I will try it soon. I will report to you, but I think wether the quality of Bluetooth is not the same like Line in.

[Nutul]

The Multiroom Sender supports the following sources:
- MPD
- Bluetooth (inbound)
- AirPlay
- Spotify Connect

Line-in from a device like DAC+ ADC is not supported.

Hello Tim, thank you for your post. I search a way to get my music from my receiver over multiroom to the other rooms of my house. I thaugt that the DAC+ ADC pro could be the right way but now i see that I was wrong. Perhaps  I should try Bluetooth. 

It might work if the RN600 can successfully connect via Bluetooth to moode.

Well, I will try it soon. I will report to you, but I think wether the quality of Bluetooth is not the same like Line in.

You are almost right about this...

[Hamimoode]

Short information: 6 Raspberry pi 4 wit HATS: 4 DAC+, 1 DAC+ ADC pro and 1 HAT with Amplifier and two low price boxes with good sound are working good since yesterday. Now I will try to set up the multi room ability with one Raspberry pi 3 without any HAT.

[Tim Curtis]

Short information: 6 Raspberry pi 4 wit HATS: 4 DAC+, 1 DAC+ ADC pro and 1 HAT with Amplifier and two low price boxes with good sound are working good since yesterday. Now I will try to set up the multi room ability with one Raspberry pi 3 without any HAT.

Be sure to read the Multiroom Setup Guide (link on Multiroom Config screen) particularly about networking. There is no clock sync between Sender and Receiver in this multiroom implementation which means the network needs to deliver the sent audio packets to the Receivers within a few milliseconds of one another in order for there to be to-the-ear sync.

You can test the overall network latency by running a ping test from the sender to each receiver and then examining the ping stats for avg rtt and mdev (standard deviation). 

Below is an example showing two 5 minute ping tests from Sender host trx to Receiver hosts pb1 and sig. Note the "avg" and "mdev" figures are within ~1ms of each other.

Code:

^C
--- pb1.home ping statistics ---
305 packets transmitted, 304 received, 0.327869% packet loss, time 304404ms
rtt min/avg/max/mdev = 1.151/11.903/76.518/14.577 ms

^C
--- sig.home ping statistics ---
299 packets transmitted, 299 received, 0% packet loss, time 298400ms
rtt min/avg/max/mdev = 1.154/12.325/121.095/15.877 ms

[Nutul]

As a side note, even a 3, or 4 ms difference wouldn't be noticeable. But then... I know we're all perfectionists, then a sub-1ms is the ideal, if zero is not achievable.
Just to justify my statement:
sound travels at roughly 500m/s (it's less than that, but for math it helps rounding it up), so that a 1ms delay would be equal to listening at the two sources (the on in-time, and the one-delayed) asnif they were playing at the very same time, but being, say, one at 2 meters from you, and the other at 3 meters.
Now... in a multiroom scenario, I do not see (well, I should have said "hear"...) something like 3m- and 6m-away listening spot could make a bad listening experience, starting from the point that multiroom IS NOT critical listening...\

this is just to assure you, that even a 10ms difference would - in most cases, if not all - pass unnoticed.

[the_bertrum]

As a side note, even a 3, or 4 ms difference wouldn't be noticeable. But then... I know we're all perfectionists, then a sub-1ms is the ideal, if zero is not achievable.
Just to justify my statement:
sound travels at roughly 500m/s (it's less than that, but for math it helps rounding it up), so that a 1ms delay would be equal to listening at the two sources (the on in-time, and the one-delayed) asnif they were playing at the very same time, but being, say, one at 2 meters from you, and the other at 3 meters.
Now... in a multiroom scenario, I do not see (well, I should have said "hear"...) something like 3m- and 6m-away listening spot could make a bad listening experience, starting from the point that multiroom IS NOT critical listening...\

this is just to assure you, that even a 10ms difference would - in most cases, if not all - pass unnoticed.

The sync in multi room needs to pass the "moving from room to room" test more than it does the "hearing one room from another test", and a 10ms diff would probably fail, but not badly

[Nutul]

The sync in multi room needs to pass the "moving from room to room" test more than it does the "hearing one room from another test", and a 10ms diff would probably fail, but not badly

Yep. In this case the delay might be more recognizable - a) to an experienced ear, and b) focusing on the thing; but I think that while you are walking around your house, with a bucket full of clothing to iron, or about to put your vacuum-cleaner to operation, such discrepancies may well pass undetected. You do not do multiroom for critical listening, do you?

Nevertheless, yes, you have a point.

[Hamimoode]

Yesterday first time three places had the same music and it was synchronized I think. But two receivers didn't play. I think I had wrong configuration. I will try my very best....