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The "low" setting is for use with most direct-coupled solid-state preamplifiers such as
those made by Jeff Rowland Design Group; the "medium" setting is for use with most
solid-state, hybrid and some tube preamplifiers; the "high" setting is for use with most
tube preamplifiers. We have provided these different settings so that you may find which
one provides the best sonic results in your system. Your amp comes set from the factory
at the "medium" (20 k ohms) adjustment.
Adjustable Gain
The overall gain structure of your Model 1 amplifier can be adjusted to one of four
different values, 20, 26, 29.5 or 32 dB. (Your amp comes set from the factory at the 26
dB adjustment.) The Model 5 can thus be used with dissimilar-gain preamplifiers, as well
as with a wide variety of analog and digital sources (since many digital sources [compact
disc players, digital to analog converters] have high output voltages relative to tuners,
tape decks, etc.). This feature allows the volume control of your preamp to be used in its
optimum position. It also permits you to tailor the gain structure for use with high or
low-efficiency speakers.
The gain switches are located on the underside of the plug-in modules and should only
be adjusted by your Jeff Rowland Design Group dealer. Incorrect installation of these
modules will result in damage to the amplifier circuitry which cannot be covered under
warranty.
Signal Connections
The amplifiers from JEFF ROWLAND DESIGN GROUP offer unprecedented compatibility
with associated equipment. In all cases turn the front panel power off before
connecting or disconnecting signal wires. "Hot patching" is not recommended.
A series of descriptions follows to explain the hookup schemes most commonly utilized
in home stereo applications. For a more thorough understanding of the terms used in
this section, please read the enclosed paper on differential mode technology.
The back panel of the amplifier is clearly marked with the following:
• paralleled right and left channel outputs
• remote power switch connector
• right and left channel inputs (single-ended non-inverting, single-ended inverting and
differential inputs)
• right and left channel input impedance adjust
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