{"id":9048,"date":"2012-02-21T17:12:32","date_gmt":"2012-02-21T15:12:32","guid":{"rendered":"http:\/\/www.hifi-advice.com\/blog\/?page_id=9048"},"modified":"2019-03-29T10:53:17","modified_gmt":"2019-03-29T08:53:17","slug":"jrdg-company-special-aeris-dac","status":"publish","type":"page","link":"https:\/\/www.hifi-advice.com\/blog\/jrdg-company-special-aeris-dac\/","title":{"rendered":"JRDG Company Special – Aeris DAC"},"content":{"rendered":"

2011-present<\/strong><\/p>\n

Retail price when introduced in the Netherlands in 2013 – 11.500 euro
\nRetail price in the Netherlands in 2016 – 12.500 euro<\/p>\n

\"rowland-aeris-front-close_550pix\"<\/p>\n

Jeff’s first entry into the digital world – if you’re not counting the ICE-power sidestep (which technically isn’t digital either). The Aeris is classic JRDG component: a heavy solid block of aluminum with machined cavities for the electronics. As with recent preamps, the circuitboard doesn’t hold many components yet the sound is typical Rowland: smooth, liquid, refined and detailed. But there’s also a newfound beat in its step and dynamics aren’t only good on a mirco-level but also on macro-level.<\/p>\n

Extensive Review
\n<\/a>Aeris + PSU Extensive Review<\/a><\/p>\n

\"Rowland_Aeris_550pix<\/p>\n

Separately housed power supply. Inside are actually two supplies: one for analog and one for digital. Naturally the power supply is also machined from a single block of aluminium. The unit comes complete with a very long and high quality DC cable.<\/p>\n

\"Rowland_Aeris_550pix<\/p>\n

\"Rowland_Aeris_550pix<\/p>\n

The IR receiver is mounted on the bottom side<\/p>\n

\"rowland-jeff-with-aeris-11-05-20_highend_260_550pix\"<\/p>\n

Jeff himself holding the Aeris during a Munich high end audio show in 2o12<\/p>\n

\"rowland-corus-psu-aeris-en-825-hvp-veldhoven-2016_550pix\"<\/p>\n

Demo system of Hans van Put (HVP – distributor for the BeNeLux) during the VAD show in 2016 in Veldhoven, the Netherlands. This is where I first heard the PSU<\/a>.<\/p>\n

\"rowland-aeris-corus-725_550pix\"<\/p>\n

\"Rowland_Aeris_550pix<\/p>\n

My own system at the time when I reviewed, and purchased, the Aeris DAC. Together with the AudioAanZee Ultra Flow<\/a> music server it outperformed my then best Meridian Sooloos MD600<\/a>\/818<\/a> streaming solution. It also handsomely bettered the PS Audio PWD MKII<\/a>.<\/p>\n

\"Rowland_Aeris_550pix<\/p>\n

\"Rowland_Aeris_550pix<\/p>\n

Above: the rear of my Aeris, with 2 coaxial inputs on BNC. Below: an early demo sample (no serial number, but the letters DS instead) of the Aeris, with only one coaxial input on RCA.<\/p>\n

\"aeris_back_panel_rgb_550pix\"<\/p>\n

Detailed Inside Pictures<\/h2>\n

Source:\u00a0Wizard High-End Audio Blog<\/a><\/p>\n

\"rowland-aeris-inside-2_550pix\"<\/p>\n

\"rowland-aeris-inside-3_550pix\"<\/p>\n

\"rowland-aeris-inside-5_550pix\"<\/p>\n

\"rowland-aeris-inside-7_550pix\"<\/p>\n

\"rowland-aeris-inside-usb-receiver-from-ti-tas1020b_550pix\"<\/p>\n

USB receiver from Texas Instruments – TAS1020B<\/p>\n

\"rowland-aeris-inside-under-spartan-there-are-three-chips_550pix\"<\/p>\n

Left – AD1895 192 kHZ Asynchronous Sample Rate Converter
\nMiddle – Xilinx Flash for the Spartan FPGA chip
\nRight – AKM 4113 24192 SPDIF receiver<\/p>\n

\"rowland-aeris-inside-ad1853-delta-sigma-24-192-dac-chip_550pix\"<\/p>\n

Analog Devices 1853 delta sigma 24 192 dac chip<\/p>\n

\"rowland-aeris-inside-under-the-dac-chip-there-are-two-lundahl-ll1588-transformers_550pix\"<\/p>\n

Under the dac chip there are two Lundahl LL1588 transformers<\/p>\n

Aeris Technical Features<\/h2>\n

IsoSyncECS<\/strong>
\nIsolated Synchronous Error Correction System. Based upon an asynchronous buffer, voltage controlled crystal oscillators, and a 24 bit D\/A converter \u2013 all under the precise control of an FPGA (Field Programmable Gate Array) running proprietary algorithms.<\/p>\n

Bit Perfect and Virtually Jitter Free<\/strong>
\nBit perfect conversion with total jitter output noise of less than 10 picoseconds RMS from any input \u2013 USB, TOSLINK, and SPDIF.<\/p>\n

Multi-Stage Isolated Power Supply<\/strong>
\nMain power supply is isolated inside an external machined aluminum chassis. Eleven precision high-speed regulators provide low impedance and low noise \u201cpoint of load\u201d DC current to all analogue and digital circuits.<\/p>\n

Isolated Audio and Digital Circuitry<\/strong>
\nLeft and right channel audio output circuits, digital processing, and D\/A conversion circuits are isolated within individual milled aluminum pockets resulting in exceptional EMI shielding, and thermal stabilization.<\/p>\n

Volume Control<\/strong>
\nWide range level control of outputs permit direct connection to power amplifiers.<\/p>\n

Driver-Free Operation<\/strong>
\nThe USB interface requires no additional drivers to install or maintain\/update.<\/p>\n

Cross-Platform<\/strong>
\nThe USB interface is plug-n-play with all operating systems, including PC, Mac, or Linux.<\/p>\n

Machined Aluminum Chassis<\/strong>
\nPrecision-machined chassis milled from a solid block of aircraft grade 6061-T6 aluminum, provides exceptional thermal stability, RFI\/EMI shielding, and resonance control.<\/p>\n

6-Layer Circuit Boards<\/strong>
\nMulti-layer circuit boards provide extremely low impedance ground and power distribution for remarkably low digital noise contamination.
\nHigh-Precision Surface Mount Components<\/p>\n

Extensive use of Lead (Pb)-free, low temperature coefficient, active and passive surface-mount components results in significantly smaller loop areas, reduced circuit capacitance and inductance, and introduces less noise than conventional leaded components.<\/p>\n

Transformer Coupled Outputs<\/strong>
\nTransformer balanced XLR line outputs provide outstanding output common-mode noise rejection, eliminate potential ground loops, and ensure compatibility with other equipment.<\/p>\n

Output Connectors<\/strong>
\nRhodium \/ Teflon Cardas output connectors for both balanced and unbalanced outputs preserve maximum audio signal integrity.<\/p>\n

Remote Control<\/strong>
\nAllows remote control of volume, mute, standby, and input selection.<\/p>\n

Aeris Specifications<\/h2>\n

Inputs<\/strong>
\n1x USB Accepts up to 24 bit PCM at 44.1, 48, 88.2, and 96 kHz
\n1x Toslink Accepts up to 24 bit PCM from 11 – 192 kHz
\n2x SPDIF Accepts up to 24 bit PCM from 11 – 192 kHz<\/p>\n

Outputs<\/strong>
\n1 pair balanced XLR \/ 1 pair unbalanced RCA 7 volts RMS max output level<\/p>\n

Volume Control Dual-stage attenuation<\/strong>
\n70 dB range, plus 20 dB overdrive<\/p>\n

Software\/Drivers<\/strong>
\nNo special drivers necessary
\nUSB interface is plug-n-play with all operating systems, including PC, Mac, or Linux.<\/p>\n

Clocks<\/strong> (2X)
\n20 bit dynamic range Voltage Controlled Crystal Oscillators (VCXO), 44.1 kHz and 48 kHz < 1 picosecond RMS jitter<\/p>\n

D\/A Converter<\/strong>
\nDifferential output 352.8 kHz, 24 bit Digital Filter Finite Impulse Response (FIR) symetrical. Flat phase and group delay<\/p>\n

THD+N<\/strong>
\nAnalogue outputs < 0.0006%<\/p>\n

Output Impedance RCA \/ XLR<\/strong>
\n120 ohms<\/p>\n

More Jeff Rowland<\/h2>\n

Jeff Rowland Company Special Main Page
\n<\/a>Jeff Rowland Company Special DACs<\/a>
\nAeris Extensive Review
\n<\/a>Aeris + PSU Extensive Review<\/a>
\n<\/a>Aeris and Wadia 521 compared<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

2011-present Retail price when introduced in the Netherlands in 2013 – 11.500 euro Retail price in the Netherlands in 2016 – 12.500 euro Jeff’s first entry into the digital world – if you’re not counting the ICE-power sidestep (which technically isn’t digital either). The Aeris is classic JRDG component: a heavy solid block of aluminum […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9048","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages\/9048","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/comments?post=9048"}],"version-history":[{"count":5,"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages\/9048\/revisions"}],"predecessor-version":[{"id":11444,"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages\/9048\/revisions\/11444"}],"wp:attachment":[{"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/media?parent=9048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}