{"id":8567,"date":"2010-04-27T21:43:10","date_gmt":"2010-04-27T19:43:10","guid":{"rendered":"http:\/\/www.hifi-advice.com\/blog\/?page_id=8567"},"modified":"2020-11-08T12:16:17","modified_gmt":"2020-11-08T10:16:17","slug":"corus","status":"publish","type":"page","link":"https:\/\/www.hifi-advice.com\/blog\/corus\/","title":{"rendered":"JRDG Company Special – Corus"},"content":{"rendered":"

2010-2020
\n<\/strong>Retail price in 2015 in BeNeLux – 19.750 euro<\/p>\n

Corus Extensive Review<\/a><\/p>\n

\"File_924,<\/p>\n

The Corus could be regarded as a Criterion-lite, having most of its circuitry (if not all of its circuitry) exchanging the Battery Power Supply for an external switched power supply. Rowland’s latest products now feature a slightly curved frontpanel and are less wide (now 39,4 cm instead of 44,5 cm).<\/p>\n

\"rowland-corus-front-l_550pix\"<\/p>\n

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

Above:\u00a0Corus with 725 and Aeris<\/p>\n

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Above: the IR remote control is the same for Corus and Criterion<\/p>\n

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\"rowland_corus_cp-img_9172_550pix\"<\/p>\n

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Above: I compared the\u00a0Corus with the Coherence II, Concerto and Synergy IIi, the latter also with the optional BPS-2. An extensive review of this comparison will appear soon.<\/p>\n

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\"rowland-corus-rear-l_550pix\"<\/p>\n

\"rowland_corus_cp-img_0212_550pix\"<\/p>\n

Above: Corus top down with its bottom plate removed<\/p>\n

\"rowland_corus_cp-img_0217_550pix\"<\/p>\n

\"rowland_corus_cp-img_0216_550pix\"<\/p>\n

\"rowland_corus_cp-img_0222_550pix\"<\/p>\n

\"rowland_corus_cp-img_0224_550pix\"<\/p>\n

Input and output transformers<\/p>\n

\"rowland_corus_cp-img_0225_550pix\"<\/p>\n

Above: rear part of the display. Below: rear part of the optical encoder for volume<\/p>\n

\"rowland_corus_cp-img_0227_550pix\"<\/p>\n

\"rowland_corus_cp-img_0209_550pix\"<\/p>\n

Separate switched power supply<\/p>\n

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\"rowland_corus_cp-img_0208_550pix\"<\/p>\n

Above: the voltage provided by the switched power supply is filtered before it enters the Corus.<\/p>\n

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\"rowland-corus-ir-receiver-inside_125pix\"<\/p>\n

Above: inside the IR receiver<\/p>\n

\n

Update 2015<\/strong><\/p>\n

The Criterion is indeed discontinued and the Corus is the successor. With the addition of the upcoming PSU the Corus is supposed to even surpass the Criterion. The PSU was expected was Q3 of 2013 but has been delayed,\u00a0and finally appeared late 2016.<\/p>\n

Corus Extensive Review<\/a><\/p>\n

\n

Features<\/h2>\n

Machined Aluminum Chassis<\/strong>
\nPreamplifier circuitry housed inside a single ultra-low resonance, structurally rigid chassis, precision-machined from a solid block of aircraft grade 6061-T6 aluminum, completely sealed for maximum electrical\/EMI\/RFI isolation.<\/p>\n

Functional Isolation<\/strong>
\nPower supply is confined inside an external machined aluminum chassis. Sensitive audio circuits isolated from power supply in main preamplifier chassis. Left and right channel circuits are further isolated into individual milled aluminum pockets in a true dual mono design for ultimate EMI\/RMI shielding.<\/p>\n

Ceramic Circuit Boards<\/strong>
\nAll audio circuits are implemented on military-grade, multilayer, low dielectric constant, Rogers\u2122 ultra-rigid ceramic circuit board substrate for extremely low energy retention and absorption. Large low impedance ground plane areas for extended internal star-grounding.<\/p>\n

Ceramic Capacitors<\/strong>
\nNewly developed ceramic capacitors replace conventional electrolytics, resulting in power supply noise decoupling improvements by an order of magnitude (10X), especially at higher frequencies.<\/p>\n

Dual-zone Preamplification<\/strong>
\nSeparate 2nd gain stage for record outputs offers same circuitry as the primary signal path with independent volume control.<\/p>\n

Transformer-Coupled<\/strong>
\nAll inputs and outputs routed through professional grade Lundahl transformers for maximum common noise rejection, EMI immunity, and cross-component compatibility. Transformer coupling to all circuits ensures identical gain for both balanced and unbalanced inputs and outputs.<\/p>\n

Flexible Connectivity<\/strong>
\n6 inputs (4 XLR balanced, 2 RCA unbalanced); 4 main outputs (2 XLR balanced, 2 RCA unbalanced); 2 record outputs (1 XLR balanced, 1 RCA unbalanced); per channel.<\/p>\n

Output Offset<\/strong>
\nHigh-resolution programmable gain offset on main unbalanced output 2 with 0.5dB resolution adjustable relative to main output 1.<\/p>\n

Unity Gain Inputs<\/strong>
\nAny main input can be configured as a unity gain bypass for compatibility with theater processors.<\/p>\n

Channel Balance<\/strong>
\nHigh-resolution (1.0dB) panning of stereophonic image (channel balance) for a maximum +\/-20dB shift.<\/p>\n

VFD<\/strong>
\nLong life 32×320 pixel custom graphic vacuum fluorescent display (VFD) offers maximum resolution of display data for status indication.<\/p>\n

Handheld Remote Transmitter<\/strong>
\nHighly ergonomic, custom handheld remote transmitter milled from aluminum billet supports complete system control and duplicates front panel operations.<\/p>\n

Remote Sensor<\/strong>
\nWired remote sensor milled from aluminum billet enables handheld remote transmitter operation while housing preamplifier in closed cabinet enclosures.<\/p>\n

Quiet power-up<\/strong>
\nNo turn-on or turn-off transients during intermittent power interruptions.<\/p>\n

Technical Specifications<\/h2>\n

Overall Gain Maximum 7 dB , +\/- 20 dB independently programmable on each input<\/p>\n

Gain Range 99.5 dB, 199 Equal Increments<\/p>\n

Gain Resolution 0.5 dB, +\/- 0.03 dB Over Entire Range<\/p>\n

Frequency Response 10 Hz \u2013 300 kHz, -3 dB @ 8 ohms<\/p>\n

Maximum Input Level 13.5 volts (RMS) @ 0 dB Gain<\/p>\n

Maximum Output Level 13.5 volts (RMS)<\/p>\n

THD + Noise < .003% @ 2 volt (RMS) Output, 50 Hz \u2013 20 kHz<\/p>\n

Common Mode Rejection Ratio > 90 dB, 20 Hz \u2013 20 kHz<\/p>\n

Channel Separation > 93 dB, 20 Hz \u2013 20 kHz<\/p>\n

Input Impedance 40k ohms Balanced or Unbalanced<\/p>\n

Output Impedance 60 ohms Balanced or Unbalanced<\/p>\n

Inputs 4 pair Balanced (XLR), 2 pair Unbalanced (RCA)<\/p>\n

Outputs 2 pair Balanced (XLR), 2 pair Unbalanced (RCA) for Main<\/p>\n

Power Consumption 15 watts<\/p>\n

Power Supply Universal Voltage Input Power Factor Corrected Power Supply<\/p>\n

Display 320 x 32 dot Vacuum Fluorescent Display (VFD)<\/p>\n

Preamplifier Weight 22 lbs. \/ 10 kg<\/p>\n

Power Supply Weight 6 lbs \/ 2.7 kg<\/p>\n

Preamplifier Dimensions (h\/w\/d) 3.9\u201d x 15.5\u201d x 12.3\u201d (99mm x 394mm x 312mm)<\/p>\n

Power Supply Dimensions (h\/w\/d) 2.9\u201d x 4.7\u201d x 11\u201d (73mm x 119mm x 279mm)<\/p>\n

<\/h2>\n

More Corus<\/h2>\n

Corus Extensive Review
\n<\/a>Corus + PSU Extensive Review
\n<\/a>Compared to Coherence II, Synergy IIi and Concerto<\/a><\/p>\n

More Jeff Rowland<\/h2>\n

Jeff Rowland Company Special Main Page
\n<\/a>Jeff Rowland Company Special Preamplifiers<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

2010-2020 Retail price in 2015 in BeNeLux – 19.750 euro Corus Extensive Review The Corus could be regarded as a Criterion-lite, having most of its circuitry (if not all of its circuitry) exchanging the Battery Power Supply for an external switched power supply. Rowland’s latest products now feature a slightly curved frontpanel and are less […]<\/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-8567","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages\/8567","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=8567"}],"version-history":[{"count":8,"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages\/8567\/revisions"}],"predecessor-version":[{"id":26198,"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/pages\/8567\/revisions\/26198"}],"wp:attachment":[{"href":"https:\/\/www.hifi-advice.com\/blog\/wp-json\/wp\/v2\/media?parent=8567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}