dCS Rossini Apex D/A processor Specifications

Sidebar 1: Specifications

Description: Upsampling Network D/A processor with volume control and remote control. Roon Ready and compatible with AirPlay, Spotify Connect, and UPnP. Streaming from Tidal, Qobuz, Deezer, and internet radio. File playback of PCM, DSD, and MQA from NAS, external drive, or USB stick via dCS Mosaic Control app or other playback software. Automatic upsampling to DXD, DSD64, or DSD128. Filters: 6forPCM,4forDSD,1for MQA. Digital inputs: Network (Ethernet RJ45) accepts up to PCM 24/384 and DSD128 in DFF or DSF format; USB-B 2.0 accepts up to 24/384 and DSD128 in DoP format; USB-A accepts up to 24/384 and DSD128 in DFF/DSF format; 2 × AES3 inputs on 3-pin female XLR connectors accept up to 24/192 PCM and DSD128 in DoP format; one Dual AES pair accepts from 24/88.2–384 and DSD128 in DoP format; 1 × S/PDIF (RCA) accepts up to 24/192 and DSD64 in DoP format; 1 × S/PDIF (BNC) accepts up to 24/192 and DSD64 in DoP format; 1 × S/PDIF optical (TosLink) accepts up to 24/96 PCM. Full decoding and rendering of MQA from network and USB2 ports. RS232 interface. Analog outputs: 1 pair balanced (XLR), 1 pair single-ended (RCA). Output levels: selectable 0.2V, 0.6V, 2V, 6V RMS. Output impedance, XLR: 3 ohms. Output impedance, RCA: 52 ohms. Minimum load: 600 ohms (10k–100k ohms recommended). Word Clock inputs: BNC, accepts standard Word Clock at 44.1, 48, 88.2, 96, 176.4, or 192kHz; data rate can be the same or an exact multiple. Word Clock output: BNC. Upsampling to DXD, DSD64, or DSD128. Residual noise for 24-bit data: Better than –113dB, 20Hz–20kHz unweighted at 6V output setting. L/R crosstalk: <–105dB, 20Hz–20kHz. Power consumption: 23W (typical), 28W maximum.
Dimensions: 17.5" (444mm) W × 5"(125mm) H × 17.2" (435mm) D. Weight: 34.3lb (15.6kg).
Finish: Silver or Black.
Serial number of unit reviewed: RSD59579. Manufactured in the UK.
Price: $32,800. dCS-installed Apex upgrade: $9000. Approximate number of dealers: 24. Warranty: 3 years, parts & labor, for original owner, from date originally shipped from dCS.
Manufacturer: dCS (Data Conversion Systems), Ltd., Unit 1, Buckingway Business Park, Anderson Rd., Swavesey, Cambridge CB24 4AE, England, UK. US distributor: Data Conversion Systems Americas, LLC, PNC Bank Bldg., 300 Delaware Ave., Suite 210, Wilmington, DE 19801. Tel: (302) 473-9050. Web: dcsaudio.com.

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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