The Ground Lift Feature Of The Dac Iv; The Proi2S Interface; Umt With Dual Power Supplies; Umt With Non-Msb Dac - MSB Technology Universal Media Transport plus User Manual

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The Ground Lift feature of the DAC IV

This feature is the most powerful tool available for UMT setup and makes a huge difference in sound!

So we have given you all the tools to get it right. The most important is a ground lift in the DAC IV menus that disconnects the analog

part of the DAC output stage from the chassis and digital ground. The idea is to avoid ground loops and if your Amps are grounded this

connection SHOULD be lifted. If your AMPs float, lifting this ground connection could result in the destruction of your DAC should you

accidentally discharge a lot of static to the AMP. So make sure the Amplifier case is grounded before doing the ground lift.

The next tool is the interconnect. The job of the interconnect is to get the digital bits from the transport to the DAC. We want all the bits

sent without errors. All the interconnect types will do this. The standard connections are limited to 24 bits and the MSB network is 32

bits. Otherwise they all do the same job, EXCEPT were it relates to ground noise. Here we have big differences. Optical has no ground

and the balanced almost no ground. Coax has a transformer coupled ground and the MSB ProI2S has absolutely no ground. This is the

best of all worlds and is the preferred output for the UMT. If you do not have the PRO input on your DAC and you are hooked up to

video, you may well find the optical connection best sounding. There is no ground connection at all. There is no rule. Any could sound

best in your system. You just have to try them.

The final layer of isolation is the use of two power supplies. This further isolates the video and audio parts of the UMT. The sonic impact

of this isolation will be system dependent and may vary from minor to major depending on the exact configuration of your system and

the quality of your power. See the power section below.

With a UMT set up for use without an MSB DAC, the highest quality digital connection should be made with the DAC that the DAC

can support. We would generally rank the connections in this order: Balanced XLR, Coaxial RCA, Optical. If your DAC supports DSD

via DoP than you are all set. If not you need to reprogram the UMT to output PCM DSD when an SACD is played (This mode is not

available in the MULTICHANNEL MODE).

TO SET DSD TO PCM OUTPUT: On the remote press: <DIMMER> <DIMMER> <DIMMER> <5>

TO SET DSD BACK TO DoP OUPUT: On the remote press: <DIMMER> <DIMMER> <DIMMER> <4>

The single most important component of good sound in a transport is low jitter. In the UMT we have taken this problem very seriously.

The best possible clock for the UMT is the clock of the DAC. When this clock is used to run the UMT, the audio and video in the UMT

is actually clocked from the DAC clock. This can be accomplished with an MSB DAC using the ProI2S connection. In this case the

clock in the UMT is only used to get the UMT going until the DAC link is established. With an older MSB DAC or a non-MSB DAC,

the clock is vitally important.

This view of the UMT has the optional Red Femto140 clock

installed.

The Galaxy Femtosecond Clock is the ultimate clock for the

lowest possible jitter.

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