Buffalo III - flexibility without compromise.

[LeonvB]

Shall I tie together SCLK1 and SCLK2, LRCK1 and LRCK2 to connect to appropriate pins of BIII?

Impossible to tell. If SCLK1 = SCLK2 and LRCK1 = LRCK2 you could connect just one of each. You'll have to contact the manufacturer of your I2S module to ask how it is implemented.

[AndriyOL]

Originally Posted by LeonvB

Impossible to tell. If SCLK1 = SCLK2 and LRCK1 = LRCK2 you could connect just one of each. You'll have to contact the manufacturer of your I2S module to ask how it is implemented.

What about GND pin?
If I configure BIII outputs to 8ch and play 2ch source only dynamic range will suffer? BIII inputs shall be configured in the same way as outputs? What are drawbacks of not paralleling inputs of the dac?
Can I use XLR to RCA converters to connect dac outputs to SE amplifier?
Thanks in any way.

[Russ White]

Your "I2S" does not sound like any I have ever seen. What is the source?

[AndriyOL]

The source is PC sound card with SC4382 dac. I sent you a pm Russ with my connection problem description.
However I have anoher card with Phillips UDA1328 dac, but it's only 6ch PCM input.
Can I use something like this http://www.fullcompass.com/product/297984.html to connect BIII to my SE amp?

[LeonvB]

- GND is connected to the signal ground. I'm sure your I2S input has a ground pin hidden somewhere.
- Noise will likely be higher.
- You can use the SE outputs of the I/V stage to connect your SE amplifier.

[AndriyOL]

Originally Posted by LeonvB

- GND is connected to the signal ground. I'm sure your I2S input has a ground pin hidden somewhere.
- Noise will likely be higher.
- You can use the SE outputs of the I/V stage to connect your SE amplifier.

- it has, there is an entire ground plane used in such equipment. my PC GND is very noisy, in fact it posses 112VAC potential with refference to earth as a result of such PSU implementation (thermistors from vac lines to middle point).
- do you mean in case when dac inputs are not paralleled like outputs?
- I'm aware of that. What about this converter?

[Russ White]

He answered that. You can use a "converter" (its not converting anything) like that at the DAC outputs, but the noise will be higher. It is far from ideal.

[AndriyOL]

Russ,
What input impedance range amplifier should have so the DAC will act as a voltage source? How to measure amplifier's input impedance if there is an input capacitor, just behind it?

[beau2317]

Any amplifier will have a sufficiently high input impedance to make the output of the DAC chip act as a voltage source. Another way of looking at this is that you need an input impedance of around zero ohms for it to *not* act as a voltage source (ie a current source) and nobody makes amps like that.

[beau2317]

I'd like to report this question - it got lost in a deep discussion about ribbon connectors.
===============================================
I'm interested in any opinions from BIII users as to the exact meanings and effects of some of the switch settings.

I'm only using SPDIF input, mostly red book. So what effect do these settings have, or are they even relevant?

- Quantizer setting
- Differential mode
- FIR Roll off (and what does this filter do exactly?)