When the "Bitstream"
technology was introduced by Philips, several manufacturers embraced the new
technology. The first generation SAA 7321 Bitstream chip found its way
to many converters but the audiophile press gave the products only a lukewarm
reception. Museatex designers felt that while the concept had merit, the technology
was not up to par with state-of-the-art converters.
The second generation
SAA 7350 chip, with 384 times over-sampling and a differential output circuit,
elevated bitstream conversion to audiophile status.
The Melior Bitstream
D/A converter has since become a reference standard. The Melior Bitstream
Converter has two digital inputs, one fiber optic and one co-axial. Two independent
digital sources can be connected to the unit. A front panel membrane switch
allows you to choose between the two.
The input frequency
rate is automatically sampled and displayed on the front panel. This means that
any two digital inputs can be used regardless of sample rate.
- Museatex chassis
with available black or mahogany wood side panels.
- Selectable inputs
(2): TOSlink, Coax.
- Digital Inputs:
EIA/CP-340 level II compatible.
- Optical: 660nm
emission wavelength, 5 meters max. transmission distance.
- Coaxial: Sony/Philips
digital interface format: 0.5V peak to peak; 75 Ohms.
- Digital Filtering:
384X over-sampling Bitstream technology.
- Frequency Response:
5 Hz to 20 KHz, +0,-0.1 dB.
- Meitner Floating
Charge power supply.
- Noise, optical
and electrical inputs (30 KHz BW) : Less than 90 dB.
- Inputs: (2)
TOSlink optical, 75 Ohm coaxial.
- Outputs: Stereo
(RCA) 300 Ohms.
- Output Level:
3.0 V RMS Max. (Analog).
- Distortion (THD+N):
Less than 0.03%.
- Distortion (SMTE-IM):
Less than 0.03%.
- Filtering: 18
bit, 8 times over-sampling.
3" X 7-1/4" X 13-1/4".
- Weight: 7 Lb.
The Data II Update
This D/A, like the Bidat is based on the Philips Bitstream technology. This was
a great sounding DAC in its day and still serves the music well, though not with
the same credentials as the Bidat. While working on the Bidat a number of discoveries
were made that are directly applicable to the Bitstream DAC. It was decided that
a complete upgrade should be offered to take advantage of all these updates and
add a few other conveniences as well. The original circuit board is retained but
many of the parts are replaced or removed. Below is a list of updates and their
advantages that make up this comprehensive upgrade.
All the analogue circuitry is run in Class A to eliminate zero crossing error
and increase linearity.
devices: The amplifying stages do not use the latest devices but rather
ones that are immune to the high frequency noise that comes from the DAC chip.
This noise is just outside the audible range and is commonly filtered out after
the first amplifying stage but it has already done some damage in terms of upsetting
the amplifier itself.
The filters are changed to work before and after the amplifying stage and are
relaxed to allow a little more high frequency energy to pass.
The power supply is enhanced at every opportunity. This is one of the
single most critical portions of any circuit. It is where all the energy for
the circuitry comes from and must be pure and abundant. Addition of further
regulation in critical areas also helps to reduce jitter.
An IEC power receptacle has been added in place of the standard power cord.
This allows owners to take full advantage of after market power cords.
The Data II update is not to be taken lightly. In direct comparison
to other DACs it rises directly to the top. Even compared to the Bidat it is
more of a flavour difference than which is better or worse. For those who already
own the Bitstream D/A this is a natural progression. Its already an old
friend at home in your audio system and the upgrade obviates the hassle of shopping
for a new unit not to mention spending thousands more for lesser sound quality.
For those that have bought one used the same rational applies but from a different
point of view. The price for the Data II upgrade is $500.USD. Please enquire
about a suitable after market power cord
Updates are performed on Meitner and Museatex products at our Calgary facility.
Email us at firstname.lastname@example.org or call
(403) 968-1400 for more information.
Museatex Bitstream D/A Converter has been superseded by the Idat44