dCS Rossini Apex D/A processor Associated Equipment

Sidebar 2: Associated Equipment

Digital sources: dCS Rossini DAC 2.0 and Clock; EMM Labs DV2 Integrated DAC; Synology 5-bay 1019+ NAS, Uptone Audio EtherRegen with AfterDark Giesemann Emperor Double Crown Master Clock, Small Green Computer Sonore Deluxe opticalModule, Linksys mesh router and Arris modem, all powered by HDPlex 300 linear power supplies; Roon Nucleus+ music server and Nordost QNET Ethernet Switch, both powered by Nordost QSource linear power supply; Apple 2017 iPad Pro and 2017 MacBook Pro laptop with 2.8GHz Intel i7, SSD, 16GB RAM.
Preamplifier: Dan D'Agostino Momentum HD.
Power amplifiers: Dan D'Agostino Progression M550 monoblocks.
Loudspeakers: Wilson Audio Specialties Alexia 2 with Acoustic Diodes.
Cables: Digital: Nordost Odin 1, Odin 2, and Valhalla 2 (USB and Ethernet); Frey 2 (USB adapter); Wireworld Platinum Starlight Cat8 (Ethernet), OM1 62.5/125 multimode duplex (fiberoptic). Interconnect: Nordost Odin 2. Speaker: Nordost Odin 2. AC: Nordost Odin 2, Valhalla 2; AudioQuest Dragon and Dragon HC. Umbilical cords: Ghent Audio Canare for HDPlex LPSs and NAS; QSource Premium DC cables with Lemo terminations for QSource.
Accessories: Grand Prix Monza 8-shelf double rack & amp stands, 1.5" Formula platform, Apex footers; Nordost QB8, QX4 (2), QK1, and QV2 AC power accessories, QKore 1, 3, and 6 with QKore Wires, Titanium and Bronze Sort Kones, Sort Lifts; AudioQuest Niagara 5000 and Niagra 7000 power conditioners & NRG Edison outlets & JitterBugs; Tweek Geek Dark Matter Stealth power conditioner with High Fidelity and Furutech options; GreenWave AC filter; Ansuz Darkz T2S resonance support feet; Wilson Audio Pedestals; IsoAcoustics Orea footers; Stillpoints Aperture panels; Resolution Acoustics room treatment; Stein Music Super Naturals, Blue Suns/Diamonds, Quantum Organizer; Bybee Room Neutralizers; Absolare Stabilians; Symposium Ultra Platform; Marigo Aida CD mat; Stromtank S 1000 battery power source.
Room: Dedicated listening room 20' L × 16' W × 9'4" H.—Jason Victor Serinus

COMPANY INFO
dCS (Data Conversion Systems), Ltd.
US distributor: Data Conversion Systems Americas, LLC
PNC Bank Bldg.
300 Delaware Ave., Suite 210, Wilmington, DE 19801
(302) 473-9050
ARTICLE CONTENTS

COMMENTS
georgehifi's picture

If someone showed that pcb to me
https://www.stereophile.com/images/922dcs.ins.jpg
And said it was an R2R ladder dac, I'd believe them. Please enlighten me, is a RingDac dac, R2R based??? I never saw R2R dac chip or discrete in Arcam's DCS ring dac players when replacing laser.

Cheers George

Archimago's picture

Based on this (and also the article PDF):
https://dcs.community/t/dcs-ring-dac-a-technical-explanation/2724/20

The dcs RingDAC technology appears to be a multibit (5-bit) SDM system upsampled to rates like 2.8-6.1MHz depending on the model. There's a first step oversampling to 768kHz which is presumably also where the digital filtering options are applied.

With faster technology over time, these numbers can certainly increase with each generation. Not sure if necessarily needed or will imply better sound quality. Objective results look excellent already!

miguelito's picture

https://dcs.community/t/dcs-ring-dac-a-technical-explanation/2724

Long-time listener's picture

Given that DACs, such as the $700 Topping D90SE, routinely reach 21 bits of resolution (with one or two reviewed in Stereophile having 22), what is it about this particular DAC that justifies it being priced at more than ten times that amount?

georgehifi's picture

Would be real interesting to do a blind A/B with those two.
However I do with Redbook PCM CD replay believe in R2R dacs, they just sound more "fleshed out" to me.

Cheers George

ok's picture

the analog stage - which is the sole object of the apex update - is the most important part of a dac; thankfully dcs realized it at last.

miguelito's picture

I am told the upgrade involved three things:
1- Better current sources to the Ring DAC
2- Improved trace locations in the Ring DAC board
3- Improved analog output stage

miguelito's picture

Best I can say is just go for a listen. If you cannot tell the difference, then you can save a lot of money. I just upgraded my Rossini to Apex and can very much tell the difference. YMMV.

David Harper's picture

Or at least you imagine that you can. Placebo is a powerful thing.

ChrisS's picture

...skills, a highly resolving stereo system, a nice room, and great music!

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