TOPIC:

Dear Devteam

Does the ir volume control also the 2 digital channel control.
So if i add a DAC to Digital out, i can IR Volumee control on all 10 channel at the same time?

I.E. for 2 3Way active Speaker?

Thank you

Best regards
martin

sorry not being clear, for 2 x 3 Way & 2 2 Way for Hometheater Front and Rear.

Martin,

Yes it does. The volume control is a Master control affecting all channels. (analog & digital)

Hoping this clarifies .

DevTeam

Thanks, that helps!

So i can connect ANY dac, to the SPDIF and get 10 out which have Master control for all 10 channel?

Best regards
martin

Yes

Cool!

How i love this stuff.

Can i connect one IR receiver to 2x 4x8Minidsp so i can control 2 boards by IR control.
Or is there a schematic which allow a second board to connect the first IR receiver?


rgs
martin

Not sure if this will be possible

In this case both boards have to be synchronized. However the connection of two 2x8 boards is not documented.

I see several possibilities:

1. IR repeater: If both boards are within a closed housing you could use an IR repeater and send the IR commands to both IR receiver. However not sure if this works reliable. If one of two boards does not detect some commands, boards willno longer be synchronized
2. On board IR receivers signal output is connected to the microcontroller via a resistor. You could remove this resistor from one board (this will cancel your guarantee!) and route the signal from the other board. Again not sure if this will work sufficiently though
3. Third idea could work, though would need more external circuitry Don't use IR remote control feature of miniDSP 2x8 but use external pot feature. Master volume is set through an external voltage defined by the pot. It is possible to connect several boards this way. Just use any IR remote control with motor pot, many are available on the market

hope this helps

2. would be my choice

3. i don't want, because of loss of resolution because before the DSP

I have ordered anyway a PGA2311 16 CHannel Kit to compare

But Point 2. would be so easy...

The attenuation controlled by a pot (3.) is done after! the DSP in the digital domain. So no loss of resolution for the DSP processing. For me digital attenuation works very well on the 2x8. Also tried a PGA volume control however stayed with the "simple" (since it is already available) on board digital attenuation. Did not perform detailed comparison but I think actual implementations of digital attenuations aren't that bad Would be very interested to hear your experience

ok, i thougt pot would be bevor the DSP, i did read almost every thread in this Forum... but did not find a direct comparison for Pot and IR Vol. control.

But what is then the main difference?, just the implementation and internally technically does happen the same?

So a stereo pot does function for sure?

Thank you curryman

If I remember it correctly (DevTeam mentioned it in an earlier post in this forum) the difference between pot and IR volume control is where the actual attenuation takes place. Both the DSP (after the complete processing) and the following DAC feature build in attenuation. Pot controls the DAC and IR the DSP or vice versa (Perhaps DevTeam can clarify?). I don't know whether one or the other implementation is better, but rather think there will be no significant difference (reminds me to look to the datasheets ).

Stereo pot would work but I would even recommend to use a mono pot to avoid uneven levels due to pot tolerances.
Technically the pot control works like this: The pot is connected between power supply positive (3,3V) and ground. The output of the voltage divider (0-3,3V according to the actual position of the pot) is detected by the ADC of the microcontoller and used to set the actual attenuation. It is possible to feed this pot output voltage to several miniDSP boards in order to use the same volume setting for all output channels.

aha ok now i got it.

so, first i am going to use one Board, speakers are almost finished for this project.

Next week everything should work and if everything does work, i will get another board.

Thank you