Summary of Coherence
Page 1
Jeff rowland d e s i g n g r o u p.
Page 2
Coherence stereo preamplifier owner’s manual.
Page 3
Introduction w elcome to the jeff rowland design group “family” and congratulations on your purchase of what is unquestionably one of the world’s finest audio preamplifiers. þ with its combination of industrial grade active and passive devices, precision electronic circuitry and accurately machined ...
Page 4
Product features þ seven balanced xlr inputs per channel. þ two balanced xlr main outputs per channel. þ two balanced xlr record outputs per channel. þ one balanced xlr “bypass” input per channel for use in home theater installations. þ all inputs and outputs can be used with single-ended rca termin...
Page 5
2 3 4 5 8 6 7 9 contents 1.
Page 6
Initial inspection i nspect 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 (2...
Page 7
Front panel function controls listen select record select input term. Mono gain Õ gain Ô bypass phase mute listen record 1 2 3 4 5 6 7 bal cut r l low full batt ac charge mode mode select jeff rowland d e s i g n g r o u p c o h e r e n c e volume a e b c f g d h.
Page 8
Front panel function controls before attempting any system interconnection, please familiarize yourself with the front panel controls of the coherence preamplifier and power supply. The descriptions below refer to the numbers associated with the features in the diagram above. Any of the controls des...
Page 9
Front panel function controls, (cont.) listen select record select input term. Mono gain Õ gain Ô bypass phase mute listen record 1 2 3 4 5 6 7 bal cut r l low full batt ac charge mode mode select jeff rowland d e s i g n g r o u p c o h e r e n c e volume k m l i j.
Page 10
Front panel function controls, (cont.) i bypass rocker switch: momentarily pressing the upper section of the bypass rocker switch enables the rear panel bypass inputs. The overall gain of the preamplifier remains fixed at 0 db (unity) gain. All other preamplifier functions are disabled except for re...
Page 11
Preamplifier and power supply rear panels 1 a e c c d c d 2 2 3 a b b.
Page 12
Preamplifier rear panel a inputs 1-7 (female xlr): seven (7) xlr fully balanced or single- ended inputs (via supplied xlr/rca adapters) are provided for line level signals only. Each input connector conforms to a pin #1 ground, pin #2 negative, pin # 3 positive standard. Both positive and negative t...
Page 13
Installation and operation listen select record select input term. Mono gain Õ gain Ô bypass phase mute listen record 1 2 3 4 5 6 7 volume bal cut r l low full batt ac charge mode mode select jeff rowland d e s i g n g r o u p c o h e r e n c e 5 1 2 4 3.
Page 14
Installation and operation t he preamplifier is normally installed directly on top of the companion power supply. Be sure to install the supplied compliant isolation interface supports between each unit and underneath the power supply to avoid damage to chassis components and provide maximum mechani...
Page 15
Remote control features a the six-function, hand-held, ir remote transmitter permits remote operation of input selection, volume up/down, balance l/r and mute functions b a separate remote sensor/display unit simultaneously receives transmitted data and displays the numerical volume control position...
Page 16
Coherence performance specifications overall gain adjustable for each input ±20 db relative to unity gain (0 db) in 0.5 db increments input impedance adjustable for each input unbalanced 18k or 600 ohms balanced 18k or 600 ohms output impedance unbalanced 50 ohms balanced 50 ohms maximum input level...
Page 17
I f you have any additional questions regarding installation or operation, please contact your authorized jeff rowland design group dealer. Jeff rowland d e s i g n g r o u p.