Friends, I'm thinking about something I think might be of interest to more people. We have known for a long time that linear power supplies have fundamental importance in the quality of digital audio. Power supplies of excellent quality lead to unimaginable results, and we currently have a number of famous linear power supplies on the market, such as Paul Hynes, HDPlex, Mojo, and others.
Among their many peculiarities, we know that something that is common to them and that is sought from any power supply is the low noise level, the low ripple level, the high transparency to the exchange of cables, the excellence of the connections, the high energy efficiency, among other things. More than that, we know that components have specific sonorities, among them, regulators, capacitors and resistors. The big question is: considering that JCAT USB Card FEMTO (which also applies to JCAT Net Card FEMTO) has its own internal linear regulator (the LT3080), with its own circuit, which is expected from an external power supply? Obviously, in addition to power isolation, of a fully independent external cable, the power supply will also have its own sonority, but is it expected that the JCAT will work best with an external power supply and a bypass on the internal regulator?
In other words, should I expect there to be a linear power supply with extraordinary enough level to allow me to bypass the internal regulator, or the best way to use these boards is through the regulator? And, using the board with the voltage regulator, is it possible to adopt a simpler external linear power supply, or is the double regulation effect cumulative? I confess that I haven't experimented with my USB card.
Please excuse me if I'm messing around, but some of the internal jumpers (J4 and J8) are for this bypass, right? I'm asking this to understand the need for an ultra-complex and high level linear power supply, or whether a simplistic linear power supply, added to the internal regulator (LT3080), would be enough. None of the DACs I want to buy need the 5v to work, but does this regulator also reflect on the signal path?
- Speakers KEF Reference 203/2 with spikes;
- Integrated amplifier Sunrise V8 MK IV;
- DAC Ayre QB-9 192/24 + Furutech FI-03 ( R);
- Source: the Control-PC is a dedicated computer with an Asrock Q1900-ITX motherboard, 16GB Corsair Vengeance DDR3 RAM 1333MHz, 1TB Samsung 840 Evo SSD and SOtM SATA II Filter; the Audio-PC is a dedicated computer with an Asrock H81M-VG4 R2.0, an Intel Core i7-4750T, an Arctic Alpine 11 Passive Cooler, 16GB Corsair Vengeance DDR3 RAM 1600MHz and JCAT USB Card FEMTO. Both computers use Windows Server 2019 Core Mode with RAMdisk as Operational System, JPLAY FEMTO Alternative version and Audiophile Optimizer v. 3.00 (1A in Control-PC and 4D in Audio-PC). Both also use a hand made linear power supply with a Furutech FI-06 ( R).
- Cables: Nordost Tyr (speaker), Nordost Valhalla XLR (interconnect), Curious Cable (USB), Nordost Valhalla Power Cable (power distributor), Transparent PowerLink MM² (integrated amp.), Purist Audio Design Canorus Praesto Revision Power Cable (DAC), Nordost Valhalla Power Cable (computer), Kimber Kable 12TC + gold plated connectors (24 way internal power supply cable of the mother board);
- Acessories: Furutech GTX-D (G); Furutech GTX-D ( R) (x2); Sunrise Deep Line (x4); spikes Viablue HS; ebony spikes, carbon fiber bases; Nordost Qv2 (x3); acoustical and electrical reinforcements.