Hi,

thank you for the answers. But why does my Opus (the actual one) know that there will come a 44.1/48kHz signal? (Remebmer: No source connected, even if the input is shortened, I have noise) The 44.1 signal comes because my actual source is a cdp. But if a 96kHz source came instead of the cdp, the problem would remain the same because then the osr must be set to medium. How do I get this combo to handle 96kHz signals? Has the 96kHz source to be active when I switch on receiver and DAC?

So at the moment I have a workaround but no solution. Don't get me wrong, I just want to solve the problem.

Best regards

Flo

Hello Brian,



O.k. I know the difference.



It's quiet.



Yes. But I want to know if it is possible to get silence in every case when no signal is applied - no matter what source I am going to connect. In my test setup its a cdp but in the living room there is a cdp and a dvd. The dvd is capable of paying cds too.

If I switch on the system, the dvd connected but switched off (like it always is when I switch on the plugboard where all the gear is connected to) I want the setup to be silent until I inserted a cd (or dvd) and I chose the right sampling rate.

What do I have to do?



Almost all the tests were made with a coax connection. But I also tried a toslink adapter (from tp) powered up but with no source connected.

To explain: I am building a preamp with integrated DAC with the possibility to connect several analog and digital sources. At the time I was odering the parts, the mux was not in stock, so I ordered a wm8804 and built a relais board to switch the spdif sources. Thes relais board is up and running - it works with the old dac. But for the tests I don't use it. The tests are only done with a wm8808, an opus, supplied by a lcdps and a Ballsie, supplied by an other ps (other transformer) I built of my own.

In the future I want four digital inputs (two coax and two optical) for the cd, the dvd and the computer and ... . And I don't want any noise - no matter which source I am going to connect. I see that it is necessary to choose the right sampling rate but I do not understand why the sampling rate I chose would affect if there is noise or not.

With the solution like it exists now, I am able to set up the system to run with one input at a fixed sampling rate that is 44.1/48kHz with no noise. But if I wanted to watch a movie with 96kHz sound (stereo) on the dvd or listen to 96kHz samples from the computer, I would choose the according sampling rate (as far as I understood the datasheet I would have to choose it before powering up) and power up the system. I want the system to remain silent no matter if there is a source connected or not. But at the moment it won't.

So I want to know if there is a possibility to get the behaviour I want. If yes, what's my error right now? If not, what do I have to do to get it? It might be necessary that the spdif source is powered up before the receiver/dac, but is this really necessary?

Sorry for the long (and complicated?) answer. Now I have to sleep - it's deep in the night an this side of the planet.

With best regards

Flo

Edited by user Thursday, January 6, 2011 6:44:23 PM(UTC)  | Reason: Not specified

Hi Russ,

will the Metronome mute the audio stream when there is no valid signal applied?

Just for completness my recent experiment:

1. swiching on the dac (with pre and power amp)
2. switching on the source (the cdp)
3. changing cd

With the following configurations (Phillips cdp)

- osr low (1. silence, 2. silence, 3. clicks)
- osr medium (1. noise, 2. silence, 3. clicks/noise)
- osr high (1. silence, 2. silence, 3. silence)

Teac cdp:

- osr low (1. silence, 2. silence, 3. silence)
- osr medium (1. noise, 2. silence, 3. silence)
- osr high (1. silence, 2. silence, 3. clicks)

The music is reproduced in every case - no critical listening but sounds good. In my opinion, here is a lack of logic.

Did not try out other sources, because the main issue takes place before any source is applied.

Best regards

Flo

Hi io,

thanks, did not understand: where do I get the signal for Auto mute (input of hc7404) from?

regards

flo

Thank you very much