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JEFF ROWLAND
D E S I G N G R O U P
Coherence
Stereo Preamplifier
Owner’s Manual
Introduction
Welcome to the Jeff Rowland Design Group “family” and congratulations on your purchase of what is unquestionably one of the world’s finest audio preamplifiers. ˛ With its combination of industrial grade active and passive devices, precision electronic circuitry and accurately machined chassis components throughout, your Coherence Preamplifier will offer you many years of musically satisfying enjoyment. ˛ Please take a few moments to read the remainder of this Owner’s Manual. ˛ A thorough understanding of the operational features will allow you to gain the maximum performance and ease of use for which this Preamplifier was designed. ˛ Please note that your Preamplifier must be used with its companion Power Supply. ˛ The serial number of each component is located on the rear panel of each, and also recorded below. ˛ The Preamplifier serial number begins with the letter C and the Power Supply serial number begins with the letter D. ˛ Please include these numbers with any correspondence regarding your Coherence Preamplifier. ˛ It has been my joy to create an audio component of enduring value which will reflect a higher ideal of musical and artistic expression. ˛ It is my hope that these qualities will enrich your experience of ownership.
Enjoy the music!
Jeff Rowland
President
˛Jeff Rowland Design Group, Inc. 2911 North Prospect Street Colorado Springs, CO 80907 Phone: 719/473-1181
Fax: 719/633-4158
Product Features
˛Seven balanced XLR inputs per channel.
˛Two balanced XLR main outputs per channel.
˛Two balanced XLR record outputs per channel.
˛One balanced XLR “bypass” input per channel for use in home theater installations.
˛All inputs and outputs can be used with single-ended RCA terminated interconnects by using XLR/RCA adapters (one male stereo pair and one female stereo pair supplied).
˛Independent Listen and Record functions on each input permit simultaneous listening and recording from any two selected inputs.
˛Each input can be individually adjusted for R/L balance, mono/stereo, absolute phase, input impedance, and gain, exclusively independent of every other input. Individually adjusted input settings are automatically memorized and recalled when returning to that input.
˛Built-in “pink noise” generator facilitates break-in of preamplifier components and interconnected associated components.
˛Six-function hand-held IR remote control with separate IR sensor/ display unit for remote IR reception and volume level indication.
˛Chassis and all chassis components precision machined from 6061 aluminum plate provide maximum mechanical resonance control.
˛All operational functions are under microprocessor control. Within five milliseconds of any function selected, the microprocessor reverts to a non-clocking “sleep” mode which eliminates any possibility of digital noise contamination.
˛Transformer-coupled inputs and main outputs provide maximum immunity from RF contamination and system ground loops and enhance compatibility with a wide variety of interconnected components.
Power Supply Features
˛Separate power supply provides a stable, low noise DC power source utilizing reliable, long-life sealed lead-calcium batteries.
˛Microprocessor controlled charge-management system ensures optimum battery operation under all conditions. The microprocessor is normally in non-clocking “sleep” mode, except when servicing a short-term operational command.
˛Two separate power supply outputs for powering additional companion units such as an optional phono equalizer.
˛Front panel AC/DC mode switch disconnects AC power when DC mode (pure battery) operation is selected.
˛Chassis and all chassis components precision machined from 6061 aluminum plate provide maximum mechanical resonance control.
Introduction / Product Features
Contents
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Initial Inspection
Inspect the shipping container for damage. If the shipping container, packing material, amplifier or accessories are damaged or missing, notify your dealer and the shipper (if a claim is to be made). Note: Many shippers require notification and an inspection within twenty-four (24) hours of delivery to ascertain the nature of damages incurred.
Your Coherence Preamplifier has undergone extensive performance evaluations, listening tests, quality control inspections and a minimum seventy-two (72) hour burn-in period prior to shipment and should be in a perfect operational condition upon receipt. If the Preamplifier does not operate correctly, please notify your dealer immediately.
We strongly suggest that you save all packing materials. If the Preamplifier is returned to your dealer or Jeff Rowland Design Group, the original packing materials must be used for shipment. Neither Jeff Rowland Design Group nor the shipper can be held responsible for damages incurred during transit if the original factory packing is not used. All factory returns require that a Return Authorization number be issued by Jeff Rowland Design Group prior to shipment.
Contents
Ensure that all of the auxiliary components listed below are enclosed within the accessory box. Refer to the diagrams illustrated above and verify the components included.
1Remote sensor/display unit
2Handheld remote transmitter
3Remote sensor/display unit interconnect cable adapter (DB-25 male to RJ-11)
4Remote sensor/display unit interconnect cable
5Eight (8) compliant isolation interface supports
6Four (4) XLR/RCA adapters (one pair male input adapters and one pair female output adapters)
7AC power cable
8DC power cable
9One (1) warranty card (in some countries warranties are provided by the respective importer)
Initial Inspection / Contents
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