Amanero vs Musiland
Finally hooked up the Amanero USB board to the Buffalo II DAC (80 Mhz). Managed to nicely install a ribbon cable matching the input arrangement of the BII board and not having to cross any wires which can potentially create interference and noise. One wire, the data wire, has to cross over but it does so over the ground plane of the board.
Here is a close up of the wire arrangement. Every signal wire has adjacent ground wires. Most of the inner row of connectors are ground. I utilized 3 of the connections for the 5 ground wire lines. Only the actual GND wire connects to the BII board)
Connecting to Buffalo II DAC. I salvaged the wire from some board. The connector proved very useful and convenient.
Also measured the unlocks right after power-on and compared it with the latest set of data I obtained from the Musiland 03US. In both cases the DPLL was set to lowest and the sample rate was 44.1KHz. Here are the results:
I would say the two interfaces are about even with respect to “jitter that matters” to the Buffalo II DAC. Even though the number of locks with the Amanero board seems to decrease rapidly after the first 10 minutes as compared with the Musiland board, there remains a low level of unlocks whereas the Musiland “settles” to about zero unlocks after the first hour. Of course this is just one set of data…
Several previous experiments with Musiland did show settling down to zero unlocks after about 1 hour. I continued the measurements with the Amanero board and the values are: 1:40- 6 unlocks, 1:50 -3 unlocks, 2:00 -3 unlocks. I don’t know what causes this remaining low level of unlocks. For one thing the data for the Musiland was taken a long while back, so noise in the power lines (feeding my house) might have changed. Further the driver for the two devices are rather different: the Musiland driver is a USB bulk driver whereas the driver for the Amanero board is a USB asynchronous driver.
Though the design of the Amanero board is indeed “better” than the Musiland with respect to minimizing jitter, the combination of the Musiland driver and h/w implementation seems to enable the Musiland devices to be competitive with the best USB interfaces.