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Summary of Contents for JEFF ROWLAND CRITERION
- Page 1 CRITERION STEREO PREAMPLIFIER Operational Manual REV14 2010 © Jeff Rowland Design Group 2010 All Rights Reserved...
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Page 2: Important Safety Instructions
must not be modified in any way, other than CRITERION PREAMPLIFIER according to official service bulletins from JRDG (Jeff Rowland Design Group). Otherwise, the factory warranty will be immediately voided. Be sure the preamplifier is muted (volume level bracketed) before connecting or disconnecting any interconnect cables. - Page 3 NOTE FROM JEFF ROWLAND DESIGN GROUP elcome to the Jeff Rowland Design Group “family” and congratulations on your purchase of what is unquestionably one of the world’s finest preamplifiers. With its combination of features such as precision electronic circuitry, exceptional...
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Page 4: Table Of Contents
TABLE OF CONTENTS Special Design Features ......................Maintenance and Care ......................Unpacking and Placement ...................... Initial Inspection ........................Unpacking ........................... Placement and Alignment ....................Front Panel ..........................Control Chassis Display ....................Control Chassis Controls ....................Menu Options ........................Rear Panel .......................... -
Page 5: Special Design Features
AC power supply is taken offline during DC battery-based operations to isolate the completely CRITERION PREAMPLIFIER from residual mains grunge. High speed regulated, low noise switch mode power MULTI-REGULATED AC SMPS:... - Page 6 Gain stages, based upon ultra-low noise differential SHORTEST SIGNAL PATH: balanced audio amplifiers, are implemented into the shortest signal path of any previous Rowland preamplifier. All signal paths are balanced from input to output for maximum noise rejection. Separate 2nd gain stage for record outputs offers DUAL-ZONE PREAMPLIFICATION: same circuitry as the primary signal path with independent volume control.
- Page 7 Highly ergonomic, custom handheld remote HANDHELD REMOTE TRANSMITTER: transmitter milled from aluminum billet supports complete system control and duplicates front panel operations. Wired remote sensor milled from aluminum billet enables REMOTE SENSOR: handheld remote transmitter operation while housing the preamplifier in closed cabinet enclosures.
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Page 8: Maintenance And Care
If you have any questions about the care or cleaning of your CRITERION PREAMPLIFIER please contact your dealer or the JRDG factory before attempting to clean the chassis. The use of a cleanser or abrasive to clean the chassis that has not been approved by the factory will almost certainly damage the finish and will not be covered under warranty. -
Page 9: Unpacking And Placement
1 2-Meter Remote Transmitter Data Cable 4 Delrin Isolator Support Spheres Warranty Card Operational Manual IMPORTANT: RETAIN ALL PACKING MATERIALS FOR FUTURE TRANSPORT. SHIPPING PRODUCT IN INADEQUATE PACKING MATERIALS MAY VIOLATE THE JEFF ROWLAND DESIGN GROUP MANUFACTURER’S WARRANTY. -
Page 10: Placement And Alignment
PLACEMENT AND ALIGNMENT The Audio Chassis is always placed first on a stable platform, rack, or shelf. All audio interconnects can be inserted into the rear panel, at this time, while visibility is greatest. Then each multi-pin DC/Data cable can be inserted into the rear panel receptacles. Simply partially insert each cable connector shell and rotate until alignment is achieved. -
Page 11: Front Panel
FRONT PANEL The front panel of the ’s Control Chassis features a vacuum- CRITERION PREAMPLIFIER fluorescent (VFD) display, 10 push-buttons, and a multi-purpose volume/menu control knob, which can also be depressed and operates as an 11th push-button when pressed. All controls are precision machined from aluminum billet. Each pushbutton has been designed with a slightly different length to accommodate the curvature of the faceplate. - Page 12 5. CHANNEL BALANCE/OFFSET INDICATOR. The channel balance indicator is a horizontal bar graph located to the right of the phase indicator. The cursor changes from a small square to a diamond shape at the center of the bar graph when the left and right channels have identical gains, or when no input gain offset has been added to a selected input.
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Page 13: Control Chassis Controls
MUTE 6. VOLUME/ENTER CONTROL KNOB. Rotation of the volume control knob clockwise will increase the output level of the . Rotation of the knob counter- CRITERION PREAMPLIFIER clockwise will decrease the output level. The features a dual- CRITERION PREAMPLIFIER range volume control system. Rotating the volume knob slowly will cause the volume to increase or decrease in small, precise steps. -
Page 14: Menu Options
3 to 3.5 hours. NOTE: NEW BATTERIES WILL USUALLY ACHIEVE MAXIMUM CAPACITY AFTER SEVERAL CHARGE/DISCHARGE CYCLES. WHEN THE CRITERION PREAMPLIFIER IS NEW, OR THE BATTERIES HAVE BEEN REPLACED, FULLY CHARGING AND DISCHARGING THE BATTERIES WILL EXPEDITE THE CALIBRATION OF THE CHARGE MANAGEMENT SYSTEM. - Page 15 STOP CHARGING. Turns off the charging circuit, but continues to run on AC. This menu selection is optional, as charging is normally terminated automatically. STANDBY. Enters mode. mode must be exited by pressing the front STANDBY STANDBY panel’s Standby button. ...
- Page 16 15 seconds whenever any command is issued through the front panel or handheld remote transmitter. FACTORY DEFAULT. Return all preamplifier settings to factory defaults. CRITERION PREAMPLIFIER FIRMWARE REVISION NUMBER. Indicates current version of the operating system software. CRITERION PREAMPLIFIER...
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Page 17: Rear Panel
REAR PANEL CONTROL CHASSIS Figure 3: Control Chassis Rear Panel 1. NiMH RECHARGEABLE D-CELL BATTERY COMPARTMENTS. Contains six (6) industrial high current (9000mA) Nickel Metal Hydride (NiMH) rechargeable batteries accessible by rotating each cap one quarter turn counter-clockwise. 2. INTEGRATED AC INLET, FUSE COMPARTMENT, AND AC MAINS POWER SWITCH AND FILTER. -
Page 18: Audio Chassis
AUDIO CHASSIS Figure 4: Audio Chassis Rear Panel 1. DC IN R/L POWER INPUT RECEPTACLES. Receptacles receive DC power and serial communications data via two supplied DC power cables, one for each channel, from the Control Chassis. 2. INPUTS. Four (4) pair Balanced (XLR), Two (2) pair Unbalanced (RCA) input jacks for each channel. -
Page 19: Handheld Remote Transmitter
Alternate codes may be selected to remedy conflicts with other remote controlled devices. Matching codes must be assigned to the CRITERION from the PREAMPLIFIER MENU NOTE: NORMAL CRITERION PREAMPLIFIER OPERATION UTILIZES THE REMOTE DEFAULT CODE LOCATED IN THE MENU. Figure 5: Handheld Remote Transmitter... -
Page 20: Remote Transmitter Controls
Toggles between Phase Normal (L+ +R) and Invert Both (L− −R). PHASE. ’s mute function can be controlled by MUTE. CRITERION PREAMPLIFIER pressing the dedicated button featured on the handheld remote transmitter. MUTE Normally adjusts the Main Input volume. In ... -
Page 21: Remote Transmitter Battery Replacement
REMOTE TRANSMITTER BATTERY REPLACEMENT ’s handheld remote transmitter is powered by 2 standard CRITERION PREAMPLIFIER alkaline double-A (AA) batteries. When the remote transmission range decreases or no longer operates, the batteries need to be replaced. Using a standard flat blade screw driver, unfasten the holding screw located in the bottom end of the transmitter unit. -
Page 22: General Operations
The preamplifier is best left powered on indefinitely to ensure optimum operating characteristics, and to help maintain the batteries in a fully charged condition. NOTE: IF THE CRITERION PREAMPLIFIER IS IN RUN-ON BATTERY MODE, IT WILL CONTINUE TO OPERATE EVEN WHEN THE POWER SWITCH IS TURNED-OFF. -
Page 23: Switching Between Ac Mode And Battery Mode
Press the button to activate operation. NAVIGATION LEFT () AC MODE NOTE: THE CRITERION PREAMPLIFIER DOES NOT SWITCH AUTOMATICALLY FROM AC TO BATTERY MODE WHEN THE BATTERIES ARE FULLY CHARGED. RECORD SELECT INPUT ASSIGNMENT Enter by pressing the pushbutton on the main control... -
Page 24: Setting Out 2 Offset
AC operation. CRITERION PREAMPLIFIER NOTE: PRESSING AND HOLDING THE MUTE BUTTON ON THE CRITERION PREAMPLIFIER'S CONTROL CHASSIS FOR APPROXIMATELY 10 SECONDS, THEN RELEASING, WILL FORCE A RESET OF THE PREAMPLIFIER’S HARDWARE AND RETURN MAIN AND RECORD VOLUME TO 0... -
Page 25: Battery Mode And Dc Rechargeable Batteries
WARNING: NO OTHER BATTERY TYPES (CARBON ZINC, ALKALINE, N CAD, LITHIUM) CAN BE USED IN THE CRITERION. ATTEMPTING TO DO SO MAY CAUSE FIRES, OR SEVERE DAMAGE TO THE PREAMPLIFIER. ANY DAMAGE TO THE CRITERION PREAMPLIFIER RESULTING FROM THE USE OF UNAPPROVED BATTERIES IS NOT COVERED BY THE JRDG WARRANTY. -
Page 26: Specifications
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...
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