''The FIRST ® Ultimate is a pure Linear Structured Carbon ® interconnect cable with a natural and even distributed conductor resistance along the whole length. When, with cable transfer of digital audio (SPDIF), the output impedance of the player and/or the input impedance of the DA converter and/or the cable’s impedance deviate from the required 75 Ohm, so-called standing waves occur in the connecting cable between the two pieces of equipment due to signal reflections at the impedance mismatching side(s). These standing waves will upset the DA converter’s audio signal clock retrieval circuitry in its very precise timing and thereby cause so-called “jitter” (i.e. fluctuations in the timing interval between the audio signal’s samples). This jitter generates extra audible distortion which we can describe with a harsh and aggressive sound as well as reduced resolution and imaging. The closer all impedances involved in the digital signal transfer are situated around 75 Ohm, the better. Assuming that your player’s output impedance is not exactly 75 Ohm across the whole digital frequency range and also guessing that the input impedance of your DA converter has some minor fluctuations, the connecting cable for sure will develop standing waves. Especially in such situations it is very helpful to have a well defined resistive interconnect in between, which is able to damp the signal reflections and thus provides a clean signal to the DA converter.
We performed measurements on The FIRST ® Ultimate as a digital interconnect using digital pulses (square waves) and a 50% termination impedance mismatch: Just two reflections remained before the signal echo dropped below -60 dB. In practice this means that by using The FIRST ® Ultimate as a digital interconnect, the cable and equipment interface sources of jitter distortion are eliminated. Cable signal reflections will not degrade the sound quality of your player/converter combination anymore.''
Cable Type: Coaxial
Conductor Material: Linear Structured Carbon ®
Eff. Conductor Ø/Eq. AWG No./Strands: - / - / Core: 12,000; Screen: 114,000
Resistance 20 °C / 68 °F: Core: ~36 Ohm/m.; Screen: ~4.8 Ohm/m.
Capacitance: 61 pF/m.
Insulation / Dielectric Strength / Test Voltage: Core: PE foam; Jacket: HULLIFLEX ® / 300 Vrms min.
http://www.vandenhul.com/userfiles/docs/Cable_FAQ.pdf
''The MoonGlo digital interconnects are a unique product designed to eliminate the effects of mechanical noise and resonances found in digital signal leads. MoonGlo consists of two separate micro coaxial cables. Each coax consists of a silver plated, multi filament center conductor, covered with a layer of FEP. This is shielded by a dual layer of silver foil and extruded with FEP. The two coaxes are twisted around two cushioned filaments of FEP and then an outer jacket of extruded FEP is applied. This construction is a fabulous way of eliminating timing errors, jitter and noise from the cable.
MoonGlo is a very accurate, fast and detailed cable with incredible imaging.''
Insulation: Extruded FEP
Conductor: x2 Coaxial
Material: Silver plated 99.999999% OFC
Capacitance: 29.0 pF/ft
Impedance: 75 ohms
http://www.referenceaudio.se/kablar/digitalt-ljud/nordost-moonglo-2/
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