USB to SPDIF converters shoot-out : EMU 0404 USB vs. Musiland Monitor 01 USD vs. Teralink-x vs.... - Page 4  

For now I use for the test a well sounding two meter coaxial bluejanscable, my valab cable and my main italian cable are too short.
Ciao

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I just noticed this thread now.

I have the Musiland 01US which I have modded as follows:
- powered from external 5V supply (currently SMPS) but will be trying a Shunt regulator or battery - external supply was the best upgrade so far for digital out
- tapped I2S signals & ready to link to external DAC (haven't done so yet for various reasons)
- have just received a Crystek 24MHz clock to substitute for the on-board 24MHz crystal : this will be run off a 3.3V battery
- substituted the op-amp output stage of the PCM1793 DAC with differential Vout direct to transformer: this was the biggest upgrade to the analog out sound.
- I was looking to use a ADUM4160 USB isolator but I'm told that it won't work even at the lower 24/192 speed?

Still have much work to finalise these upgrades! I wonder how it would compare to the HiFace?

I'll post some pics if anyone is interested.

I am interested

I'm not sure the Musiland crystal is too bad but I'm hoping the combination of Crystek clock powered by low noise battery will improve the sonics. Unfortunately, I won't be able to measure before & after jitter so hearing will have to do - I'll post pics later.

Here are some pics of my Musiland 01US (the one with on-board PCM1793 DAC)
First shot shows the full board which I've done the following to:
- replaced digital PS coupling caps with OSCONS
- analog PS decoupling to PCM DAC with Nichicon Muse
- the Brown & Red wires are from the differential Vout of the DAC to the twin co-ax that connects to a transformer - so this is the new output stage & sounds WAY better than the op-amp o/p stage. I needed to move the two 1K8 smd resistors from their pads (see attached schematic). This now disconnects the op-amp o/p stage but if I want to reconnect I just need to jumper from where the wires are connected to the moved smd Rs. Easily reversible mod. The other channel has thinner wires running under the board. These wires connect to isolated pads that were exposed when the RCA connectors were desoldered from the board.
Last photo shows a close-up of the Xilinx chip where the I2S lines run to the DAC. I removed some of the overlying varnish on these tracks in a staggered manner, applied a touch of flux & solder & then soldered some fine wires onto these tracks (make sure you have tinned the wire & apply some flux to the wire - line it up on the exposed, soldered track & just a tip of a soldering iron will do the job - not difficult with a magnifier. I run the wires through vias, to the bottom of the board and connect to a molex push on connector

I also put a socket (seen in the pic) on the Vcom pin of the PCM1793 as I heard that this capacitor influenced the sound - I can't say I've noticed much of a noticeable change among caps - maybe a better HF response using film?

I've marked with two red lines, the two 1k8 Rs that are moved down to join with either side of the smd cap, exposing the pads that the two wires are soldered to for the transformer output

Were the comparisons done with the Terralinkx using a quality external linear power supply?


When I look at the designs and quality of components used the TerralinX just looks superior. IMO software can't trump hardware.

Not to be negative but the Mtech looks cheap, probably $5 worth of parts. Listening to differences in transports is so subtle, I am very surprised that you are hearing a big difference. Just not convinced to sped $150 to find out.

I'll have to give it a try, it shouldn't be too dificult to configure it to a proper external PS, that way the clocks will meet their specs.

Slim,
If looking for a good clock for audio ignore ppm figures & look for phase noise at 10Hz or less as most important. The crystek $3 clock can achieve -100dBc @ 10Hz but this is only realisable with a good PS - all clocks need a good PS to achieve their stated specs.

So I'm not so sure that the HiFace white paper's spec of -78dBc @ 10Hz is particularly great! I don't know what gives the unit it's great sound - possibly the lack of any additional jitter being added by the rest of the system? I think this is why the Musiland sounds good