Getting started

RNPQuickstartV050 Page 2 of 10
FMR Audio, [phone] www.fmraudio.com
unbalanced output and a +28dBu balanced output simultaneously to allow nifty
things like separate M/S decoding while tracking the M/S signal without decod-
ing!
• Balanced/unbalanced operation — Both the mic inputs and micpre outputs
are electronically balanced, differential signals. Want to run to/from unbalanced
sources? No problem, the RNP “automatically” adjusts...no special cabling
required!
• Hi-Z DI inputs — These inputs are designed to take a source, such as a passive
bass, and not “suck the tone” away from the instrument. This input features a
high-impedance (1M Ω ), unbalanced 1/4˝ jack.
• Slowly-ramping 48V supply — To reduce the chance of destroying mics con-
nected to the RNP that can’t tolerate +48V applied to them, we ramp up the
+48Volts slowly—just in case you accidently turn on the phantom supply with a
phantom-intolerant microphone attached to the RNP. In addition, this ramp helps
reduce “settling time” of the RNP’s servos (see Geek Stuff below) and reduces the
size of the output pops/clicks.
•
EMI-resistant — By utilizing a third-order EMI filter at the front end specifically
designed to attenuate RF while giving a smooth audio performance up to 240kHz,
we’ve reduced the chances that you’ll have trouble with Radio Frequency (RF)
interfering with the RNP’s operation even at high-gain levels. When used with a
nominal 150 Ω balanced source, this filter yields exceptional audio performance.
• Output mutes — During phantom engagement/disengagement and DI/mic
switching, we momentarily mute the output signals to reduce output pops &
clicks that may otherwise annoy you and others. This mute actually occurs before
the INSERT send signal so that even devices connected to the INSERT are spared
large pops & clicks.
• Stepped gain control — To allow precise gain-setting between multiple chan-
nels, we’re using a Grayhill 12-position switch to set the RNP’s gain.
• Phase inversion control — This is fairly standard stuff to allow you to accommo-
date any phase problems due to things like system cabling, etc. This control
inverts the polarity of the micpres output signal relative to the input.
• Precision metering — Three LEDs per channel are provided for accurate meter-
ing (signal presence, +18dBu and CLIP) of the insert “SEND” signal. In addition,