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If each output terminal is loaded with the same 100R load and they are equal amplitude then the DAC itself is operating correctly.
You may have a problem with your Legato. What the the DC voltage across each I/V resistor on the legato?
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Good news, I'm afraid was the BIII.
I will measure the DC voltage across Legato I/V resistor, are R1-R2-R3-R4 right?
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square wave 1kHz 0dB FS R1 5.62VDC R2 5.62VDC R3 5.64VDC R4 5.64VDC Measured resistance value R1 147.1-147.2R R2 147-147.2R R3 146.8-146.9R R4 147R Edited by user Thursday, December 6, 2012 1:03:36 PM(UTC)
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Square wave 1kHz 0dB fs shot at the balanced output of Legato, 1st pic Left channel, 2nd pic right channel
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Earlier you said you measured the DAC directly and all of the outputs were equal... What are you saying now?
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Legato SE outputs 1kHz 0dB Fs square wave like the balanced measured before  ]Legato right SE output[/url]  ]Legato left SE output[/url] Edited by user Monday, December 10, 2012 5:26:32 PM(UTC)
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I don't understand why with the same signal the SE outputs measures 1.7V pp & balanced outputs mesures 0.8Vpp
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Legato SE output sine wave 1kHz 0dB using I2S input [IMG]h...ack.usLegato SE output sine wave 1kHz 0dB using S/PDIF [IMG]h...ack.usScope set to 0.5V/cm: using I2S B3 input: Legato SE output 1Vpp, using S/PDIF B3 input: Legato SE output 2V N.B. S/DIF pic isn't moved it's the signal moving Edited by user Tuesday, December 11, 2012 11:56:53 AM(UTC)
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S/PDIF  I2S  Edited by user Tuesday, December 11, 2012 11:54:40 AM(UTC)
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I am not sure what you are looking for...
if the amplitude between the two sources is different the first thing to check is the actual digital signals.
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How do do you have the "re-map inputs" switch set?
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Originally Posted by: Russ White  I am not sure what you are looking for...
if the amplitude between the two sources is different the first thing to check is the actual digital signals. The ampltude between the two sources is the same: I used Lorien X-Mos usb-i2s that have S/PDIF & I2S outputs, but also when you eard music is clear S/PDIF sounds much louder. The questions that I need answer are: -What's the output VRMS at the Legato single end output using I2S? because I measured only 1VRMS, it's OK with 1kHz 0dB? Legato manual saids: The output voltage at 0dbfs is about 1.5VRMS.-What's the output VRMS at the Legato balanced output with a signal 0dBfs? Really appreciate your help.
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Originally Posted by: Russ White How do do you have the "re-map inputs" switch set? SW1 1 off 2 off 3 off 4 on 5 on 6 on 7 on 8 off SW2 1 off 2 off 3 off 4 off 5 on 6 off 7 off 8 on
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If the PCM is verified identical (not just should be) the only thing I can think of that would cause that is that one of the PCM data channels is not connected - or possibly the B3 firmware is not working?
With the switch setting you show above if you have the controller with standard firmware installed SPDIF should not work at all. Because you have SPDIF auto-detect set to bypass. (SW2-5)
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I have installed the external switch to activate or desactivate the auto-detect S/PDIF, with this switch I do the test between I2S & S/PDIF [img]   [/img] Edited by user Tuesday, December 11, 2012 5:01:37 PM(UTC)
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Originally Posted by: Russ White If the PCM is verified identical (not just should be) the only thing I can think of that would cause that is that one of the PCM data channels is not connected - or possibly the B3 firmware is not working?
Please let me know how can check it? Edited by user Tuesday, December 11, 2012 5:05:33 PM(UTC)
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Originally Posted by: felipe I have installed the external switch to activate or desactivate the auto-detect S/PDIF, with this switch I do the test between I2S & S/PDIF [img] [/img] That's interesting, but the DIP switch is closed, which would always override your panel switch. I suspect your firmware is not doing anything...
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