Jeff Rowland Design Corus Line Stage Preamplifier

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Jeff Rowland Design Corus Line Stage Preamplifier

Jeff Rowland Design Corus Line Stage Preamplifier

$14,900.00 Free Shipping!

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Jeff Rowland Design Corus Line Stage Preamplifier

$14,900.00 Free Shipping!

Free Shipping!
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  • Description

     

    MY TAKE:

    Striking beauty, stunning sound, rock solid reliability - a complete package. Few products offer the complete satisfaction and pride of ownership you’ll experience with the purchase of a Jeff Rowland component. – Galen Carol

     

    The Corus Stereo Preamplifier delivers the Jeff Rowland hallmark of a sensuous and grain free musicality, combined with astonishing transparency and low level resolution. A broad 3-dimensional sound stage materializes into the physical listening space, where instruments and vocalists assume the textured appearance of solid existence.

    The preamplifier yields exceptional frequency extension and linearity, with magnificent bass definition, an extraordinarily complex exposure of harmonic structure, and a sweetly filigreed treble. The Corus yields amazingly nuanced low level detail and micro-dynamics, and outperforms every previous Rowland preamplifier with its transient speed, staggering authority, and breath-taking macro dynamics.

    The elegant main chassis milled from ingots of non-resonant aircraft-grade aluminum houses all delicate audio and control circuits. The ground-breaking AC power supply is segregated in its own handsome external milled aluminum unit.


    Watch the video showing the amazing process of machining Jeff Rowland chassis and front panel.

     

    FEATURES:
     

    • Ultra Low Resonance Chassis - Balanced preamplifier design housed inside twin ultra-low resonance, structurally rigid chassis precision-machined from solid ingots of aircraft grade 6061-T6 aluminum, completely sealed for trouble-free operation, yield maximum electrical/EMI/RF isolation.
    • Diamond Sculpted Front Panel - Matching front panels precision-machined and sculpted with a diamond tipped cutting tool into a uniquely elegant prismatic curved design.
    • Functional isolation - Power supplies and microprocessor-based system control circuits confined inside control chassis. Sensitive audio circuits isolated in audio chassis. Left and right subsystems further isolated into individual milled Aluminum pockets in true dual mono design for ultimate RF and EMI shielding.
    • Free of internal signal pollution - Control subsystem taken completely offline after each command execution to maximize sound purity.
    • Multi-regulated AC SMPS - High speed switch mode power supply (SMPS) developed for aerospace applications incorporates passive power factor correction (PFC) for sonic performance so pure and musical that is virtually invariant to power cords.
    • Ceramic boards - Circuits implemented on military-grade 4-layer ceramic boards for minimum energy retention. Boards further sport numerous grounding points for extended internal star-grounding.
    • Shortest signal path - Gain stages based on ultra-low noise advanced TI Burr brown OPA1632 differential balanced audio amplifiers are implemented into shortest signal path of any Rowland reference preamplifier.
    • Dual zone preamplification - Separate 2nd gain stage for record outputs sports own OPA-1632 modules and independent volume.
    • Transformer-coupled - All inputs and outputs coupled to identical custom wound Lundahl transformers for maximum noise rejection and cross-component compatibility. Transformer coupling also ensures invariant gain for balanced and unbalanced devices. Flexible connectivity: 6 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).
    • Input gain offsets - Hi resolution independently programmable gain offset on each main input ranging from -10dB to +10dB in 0.5dB increments--. Output offset: hi resolution programmable gain offset on main unbalanced input 2 with 0.5dB resolution.
    • Unity gain inputs - All main input configurable as unity gain bypass for compatibility with theater processors.
    • Phase inversion - Independent signal phase inversion control on left and right channels for optimum speaker setup and system checks.
    • Channel balance - Hi resolution (1.0dB) panning of stereophonic image (channel balance) for a maximum +/-20dB shift.
    • VFD - Long life graphic vacuum fluorescent display (VFD) for system control. Remote control: Highly ergonomic, custom remote control transmitter milled from Aluminum billet supports complete system control and duplicates front panel operations.
    • Remote sensor - Wired remote sensor milled from Aluminum billet enables Criterion’s control while housing preamplifier in closed cabinet enclosures.
    • Precision volume adjustments - Dual rate volume control allows precision level adjustments over nearly a 100 dB range. The volume control incorporates a permanently noiseless optical encoder that always maintain its tactile feel, accuracy, and channel balance at all settings. The volume can be adjusted from 0dB to 99.5dB from the multi-role control knob on the front panel, as well as from the multi-function remote control. Rapid turns of the control knob adjust the volume by 1.5dB increments. Slow turns of the control allow for very fine adjustments by 0.5dB increments.
    • Quiet power-up - Rocker switch on back panel coupled to timer relay, turns Criterion quietly on to full power after circuit test and stabilization.
    • Green technology - Highly efficient circuits yield modest power consumption of mere 50 Watts in class A, resulting in cool operations, and permits constant power-up to eliminate warm-up time and maximize musical performance. The Corus can operate also enclosed inside an entertainment unit.

     

    REVIEWS:


    “The Jeff Rowland Corus linestage and 725 power amplifiers are world-class electronics in every sense of the phrase. They are stunningly gorgeous to look at, a delight to use on a daily basis courtesy of their exemplary user interface, and intensely musical. Moreover, they are backed by an American company with a 26-year track record. Frankly, considering the build-quality, the technology, and musical performance, they are a great value. Although $13,600 for a linestage and $29,800 for a pair of amplifiers is hardly inexpensive, many other companies routinely charge more for less. These electronics were perfectly at home in the context of the $165,000 Magico Q7 and $54,000 Basis Inspiration turntable.

    Beyond the specific sonic characteristics I’ve described, the Corus and 725 were unfailingly musical. They’re the kind of electronics that seem to disappear from the signal path rather than make you constantly aware of their presence. At the end of the day a good yardstick for audio component quality is how quickly and how deeply they immerse you in the musical expression. By those fundamental criteria, the Corus and 725 are a home run.” – Robert Harley, TAS


    “In a world where every review seems to be good and so many products exhibit so few specific, identifiable sonic flaws, these Rowlands represent a different level of achievement. It’s that attention to detail, that perfectionist insistence on the right over the easy, that has created them – and recreated the musical performances they’ve played to such emphatic effect. If you are feeling jaded and you are losing confidence in the promise and performance of high-end audio, the JRDG Corus/625 combination is just the antidote you need. Exquisitely constructed components with their feet planted firmly on the path to musical gratification – they’ll plant yours there too.” – Roy Gregory, TAS

     

    “Each unit is built into a milled from solid chassis, mated to the almost equally massive and Rowland trademark diamond burnished front panel. The complex housing that includes the beautifully sculpted heat-sinks for the power amp has to be one of the most impressively elegant examples of CNC I’ve ever seen. The pre-amp actually consists of no fewer than four separate elements (audio circuit, psu/controller, remote control handset and separate remote receiver) all milled from solid billet. Inside the main audio chassis, the various elements of the left and right channel circuitry are housed in independent pockets, carved from the solid body. The main units each have dimples machined into their bases that locate the Delrin spheres used as feet/high-frequency isolators.” – Roy Gregory, TAS

     

    SPECIFICATIONS:
     

    • Overall Gain: Independently Programmable 0 to 20 dB on each input
    • Gain Range: 99.5 dB, 199 Equal Increments
    • Gain Resolution: 0.5 dB, +/- 0.03 dB Over Entire Range
    • Frequency Response: 10 Hz – 300 kHz, -3 dB @ 8 ohms
    • Maximum Input Level: 13.5 volts (RMS) @ 0 dB Gain
    • Maximum Output Level: 13.5 volts (RMS)
    • THD + Noise: < .003% @ 2 volt (RMS) Output, 50 Hz – 20 kHz
    • Signal-to-Noise Ratio: > 100 dB
    • Common Mode Rejection Ratio: > 90 dB, 20 Hz – 20 kHz
    • Channel Separation: 99.5 dB
    • Input Impedance: 40k ohms Balanced or Unbalanced
    • Output Impedance: 60 ohms Balanced or Unbalanced
    • Inputs: 4 pair Balanced (XLR), 2 pair Unbalanced (RCA)
    • Outputs: 2 pair Balanced (XLR), 2 pair Unbalanced (RCA) for Main Out, 1 pair Balanced (XLR), 1 pair Unbalanced (RCA) for Record Out
    • Power Consumption: 15 watts
    • Power Supply: Universal Voltage Input Power Factor Corrected Power Supply
    • Display: 320 x 32 dot Vacuum Fluorescent Display (VFD)
    • Preamplifier Weight: 22 lbs / 10 kg
    • Preamplifier Dimensions H/W/D: 3.9” x 15.5” x 12.3” (99mm x 394mm x 311mm)
    • Power Supply Dimensions H/W/D: 3.9” x 4.7” x 11” (99mm x 119mm x 279mm)

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Jeff Rowland Design Corus Line Stage Preamplifier

$14,900.00 Free Shipping!

Free Shipping!
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Description

 

MY TAKE:

Striking beauty, stunning sound, rock solid reliability - a complete package. Few products offer the complete satisfaction and pride of ownership you’ll experience with the purchase of a Jeff Rowland component. – Galen Carol

 

The Corus Stereo Preamplifier delivers the Jeff Rowland hallmark of a sensuous and grain free musicality, combined with astonishing transparency and low level resolution. A broad 3-dimensional sound stage materializes into the physical listening space, where instruments and vocalists assume the textured appearance of solid existence.

The preamplifier yields exceptional frequency extension and linearity, with magnificent bass definition, an extraordinarily complex exposure of harmonic structure, and a sweetly filigreed treble. The Corus yields amazingly nuanced low level detail and micro-dynamics, and outperforms every previous Rowland preamplifier with its transient speed, staggering authority, and breath-taking macro dynamics.

The elegant main chassis milled from ingots of non-resonant aircraft-grade aluminum houses all delicate audio and control circuits. The ground-breaking AC power supply is segregated in its own handsome external milled aluminum unit.


Watch the video showing the amazing process of machining Jeff Rowland chassis and front panel.

 

FEATURES:
 

  • Ultra Low Resonance Chassis - Balanced preamplifier design housed inside twin ultra-low resonance, structurally rigid chassis precision-machined from solid ingots of aircraft grade 6061-T6 aluminum, completely sealed for trouble-free operation, yield maximum electrical/EMI/RF isolation.
  • Diamond Sculpted Front Panel - Matching front panels precision-machined and sculpted with a diamond tipped cutting tool into a uniquely elegant prismatic curved design.
  • Functional isolation - Power supplies and microprocessor-based system control circuits confined inside control chassis. Sensitive audio circuits isolated in audio chassis. Left and right subsystems further isolated into individual milled Aluminum pockets in true dual mono design for ultimate RF and EMI shielding.
  • Free of internal signal pollution - Control subsystem taken completely offline after each command execution to maximize sound purity.
  • Multi-regulated AC SMPS - High speed switch mode power supply (SMPS) developed for aerospace applications incorporates passive power factor correction (PFC) for sonic performance so pure and musical that is virtually invariant to power cords.
  • Ceramic boards - Circuits implemented on military-grade 4-layer ceramic boards for minimum energy retention. Boards further sport numerous grounding points for extended internal star-grounding.
  • Shortest signal path - Gain stages based on ultra-low noise advanced TI Burr brown OPA1632 differential balanced audio amplifiers are implemented into shortest signal path of any Rowland reference preamplifier.
  • Dual zone preamplification - Separate 2nd gain stage for record outputs sports own OPA-1632 modules and independent volume.
  • Transformer-coupled - All inputs and outputs coupled to identical custom wound Lundahl transformers for maximum noise rejection and cross-component compatibility. Transformer coupling also ensures invariant gain for balanced and unbalanced devices. Flexible connectivity: 6 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).
  • Input gain offsets - Hi resolution independently programmable gain offset on each main input ranging from -10dB to +10dB in 0.5dB increments--. Output offset: hi resolution programmable gain offset on main unbalanced input 2 with 0.5dB resolution.
  • Unity gain inputs - All main input configurable as unity gain bypass for compatibility with theater processors.
  • Phase inversion - Independent signal phase inversion control on left and right channels for optimum speaker setup and system checks.
  • Channel balance - Hi resolution (1.0dB) panning of stereophonic image (channel balance) for a maximum +/-20dB shift.
  • VFD - Long life graphic vacuum fluorescent display (VFD) for system control. Remote control: Highly ergonomic, custom remote control transmitter milled from Aluminum billet supports complete system control and duplicates front panel operations.
  • Remote sensor - Wired remote sensor milled from Aluminum billet enables Criterion’s control while housing preamplifier in closed cabinet enclosures.
  • Precision volume adjustments - Dual rate volume control allows precision level adjustments over nearly a 100 dB range. The volume control incorporates a permanently noiseless optical encoder that always maintain its tactile feel, accuracy, and channel balance at all settings. The volume can be adjusted from 0dB to 99.5dB from the multi-role control knob on the front panel, as well as from the multi-function remote control. Rapid turns of the control knob adjust the volume by 1.5dB increments. Slow turns of the control allow for very fine adjustments by 0.5dB increments.
  • Quiet power-up - Rocker switch on back panel coupled to timer relay, turns Criterion quietly on to full power after circuit test and stabilization.
  • Green technology - Highly efficient circuits yield modest power consumption of mere 50 Watts in class A, resulting in cool operations, and permits constant power-up to eliminate warm-up time and maximize musical performance. The Corus can operate also enclosed inside an entertainment unit.

 

REVIEWS:


“The Jeff Rowland Corus linestage and 725 power amplifiers are world-class electronics in every sense of the phrase. They are stunningly gorgeous to look at, a delight to use on a daily basis courtesy of their exemplary user interface, and intensely musical. Moreover, they are backed by an American company with a 26-year track record. Frankly, considering the build-quality, the technology, and musical performance, they are a great value. Although $13,600 for a linestage and $29,800 for a pair of amplifiers is hardly inexpensive, many other companies routinely charge more for less. These electronics were perfectly at home in the context of the $165,000 Magico Q7 and $54,000 Basis Inspiration turntable.

Beyond the specific sonic characteristics I’ve described, the Corus and 725 were unfailingly musical. They’re the kind of electronics that seem to disappear from the signal path rather than make you constantly aware of their presence. At the end of the day a good yardstick for audio component quality is how quickly and how deeply they immerse you in the musical expression. By those fundamental criteria, the Corus and 725 are a home run.” – Robert Harley, TAS


“In a world where every review seems to be good and so many products exhibit so few specific, identifiable sonic flaws, these Rowlands represent a different level of achievement. It’s that attention to detail, that perfectionist insistence on the right over the easy, that has created them – and recreated the musical performances they’ve played to such emphatic effect. If you are feeling jaded and you are losing confidence in the promise and performance of high-end audio, the JRDG Corus/625 combination is just the antidote you need. Exquisitely constructed components with their feet planted firmly on the path to musical gratification – they’ll plant yours there too.” – Roy Gregory, TAS

 

“Each unit is built into a milled from solid chassis, mated to the almost equally massive and Rowland trademark diamond burnished front panel. The complex housing that includes the beautifully sculpted heat-sinks for the power amp has to be one of the most impressively elegant examples of CNC I’ve ever seen. The pre-amp actually consists of no fewer than four separate elements (audio circuit, psu/controller, remote control handset and separate remote receiver) all milled from solid billet. Inside the main audio chassis, the various elements of the left and right channel circuitry are housed in independent pockets, carved from the solid body. The main units each have dimples machined into their bases that locate the Delrin spheres used as feet/high-frequency isolators.” – Roy Gregory, TAS

 

SPECIFICATIONS:
 

  • Overall Gain: Independently Programmable 0 to 20 dB on each input
  • Gain Range: 99.5 dB, 199 Equal Increments
  • Gain Resolution: 0.5 dB, +/- 0.03 dB Over Entire Range
  • Frequency Response: 10 Hz – 300 kHz, -3 dB @ 8 ohms
  • Maximum Input Level: 13.5 volts (RMS) @ 0 dB Gain
  • Maximum Output Level: 13.5 volts (RMS)
  • THD + Noise: < .003% @ 2 volt (RMS) Output, 50 Hz – 20 kHz
  • Signal-to-Noise Ratio: > 100 dB
  • Common Mode Rejection Ratio: > 90 dB, 20 Hz – 20 kHz
  • Channel Separation: 99.5 dB
  • Input Impedance: 40k ohms Balanced or Unbalanced
  • Output Impedance: 60 ohms Balanced or Unbalanced
  • Inputs: 4 pair Balanced (XLR), 2 pair Unbalanced (RCA)
  • Outputs: 2 pair Balanced (XLR), 2 pair Unbalanced (RCA) for Main Out, 1 pair Balanced (XLR), 1 pair Unbalanced (RCA) for Record Out
  • Power Consumption: 15 watts
  • Power Supply: Universal Voltage Input Power Factor Corrected Power Supply
  • Display: 320 x 32 dot Vacuum Fluorescent Display (VFD)
  • Preamplifier Weight: 22 lbs / 10 kg
  • Preamplifier Dimensions H/W/D: 3.9” x 15.5” x 12.3” (99mm x 394mm x 311mm)
  • Power Supply Dimensions H/W/D: 3.9” x 4.7” x 11” (99mm x 119mm x 279mm)