Art RP-1 Manuel utilisateur
ARTcessories
User's Manual
IMPORTANT SAFETY INSTRUCTION – READ FIRST
This symbol, whenever it appears alerts you to the
presence of uninsulated dangerous voltage inside
the enclosure-voltage that may be sufficient to
constitute a risk of shock.
This symbol, whenever it appears, alerts you to
important operating and maintenance instructions in
the accompanying literature. Please read the
manual.
Read Instructions: etain safety and operating instructions for
future reference. Heed all warnings printed here and on the
equipment. Follow the operating instructions printed in this user
manual.
Do not open: There are no user serviceable parts inside. efer
any service work to qualified technical personnel only.
Environ ent: Protect from excessive dirt, dust, heat, and
vibration when operating and storing. Avoid tobacco ash, drink
spillage and smoke, especially that associated with smoke
machines.
Handling: Protect the controls from damage during transit. Use
adequate padding if you need to ship the unit. To avoid injury to
yourself or damage to the equipment, take care when lifting,
moving or carrying the unit.
Servicing: efer servicing to qualified technical personnel.
Installation: Install the unit in accordance with the instructions
printed in the user manual.
1
INTRODUCTION
Thank you for purchasing Applied esearch and Technology’s
P-1. The P-1 is the ideal solution to increasing the
performance of your ribbon and dynamic microphones. This
phantom powered preamp brings out all of the nuances of your
mic before running into your recording interface or Mixer
through long cable runs.
With the P1 you can tailor the loading on the mic through the
variable impedance control. The low cut filter allows you to
remove wind noise and plosives before adding additional gain.
The discrete preamp circuitry inside is designed for low noise
and transparent operation. The balanced output drives long
cable runs with ease allowing you to place the preamp as close
as possible to the mic before picking up any noise or
interference.
The P-1 is packaged in a rugged extrusion, metal XL jacks
and a solid rubber foot underneath for long, reliable operation.
Get the very best out of your mics with the P-1
2
FEATURES
• Very low noise mic preamp
• Switchable Low Cut Filter
• Variable Impedance control
• Adds at least 20dB of gain to your mic
• Low THD discrete circuitry
• uns off a Phantom power supply
• Able to drive long balanced cables
• Compact rugged package, extruded chassis
• Designed and developed in the USA
INSTALLATION and OPERATION
Connect the outputs of the P-1 to a Phantom powered source
such as a mixer or preamplifier.
Connect the P-1 input to your ibbon or dynamic mic.
Make sure you start with the gain pot set to their minimum
setting. Once connected engage the Phantom power and
adjust the gain on the P-1 for the desired level. The
phantom power will not pass through to the input thus
avoiding any potential damage to any dynamic or ribbon
mic.
3
Connections
4
APPLICATIONS
Perfect for: Live use, Project studios, Home and Commercial
installations.
The P-1 may be used in a wide variety of applications and
environments. Self-contained in an extruded enclosure, the
remote mic Preamp is designed for continuous professional
use. Because the unit is compact and lightweight, mounting
location is not critical.
The P-1 is placed inline with the Mic. The P-1 can be zip
tied to the mic stand, so tonal adjustments can be made on the
fly.
5
LOW CUT FILTER control
The Low Cut Filter is a single tuned High Pass Filter. The input
signal can be filtered to remove low frequency information. The
roll off frequency is set at 100Hz. Since it is single tuned, it
preserves some low frequency content so its use is less
obtrusive. It is especially useful in close mic’d applications
cutting out pops and wind noise.
Variable I pedance Function
Using this variable impedance function allows the user to adjust
the input impedance seen by the microphone, in turn achieving
better tonal response from your microphone used.
Dyna ic Mic
Dynamic (coil) microphones are sensitive to loading. If these
mics are not coupled correctly, the result maybe a loss in
frequency response and could result in added distortion.
As an example a common mic like the SM57 prefers a 600ohm
load. When the load is varied above or below the 600ohms,
then the mid range resonance could sound harsh and distorted.
The low-end response will also sound more controlled with a
600ohm load. There are many dynamic mics that may have
similar issues but not be as sensitive to loading as the SM57.
6
Ribbon Mic
ibbon type (transformer coupled) microphones are sensitive
to the input impedance of the preamps or mixers used to
achieve the optimum frequency response. A ibbon mic would
like to see an input impedance several times larger than its
output impedance. ibbon mics, being transformer coupled,
have increased impedance at high and low frequencies. On the
low end the mic is power bound, as you load it there becomes
a low frequency cut off at higher levels, so it may sound
distorted. At the high end, the output impedance of the
transformer increases (independent of level), so the greater the
load the less high end.
As an example, a typical ribbon mic with a characteristic
impedance of 300ohms may have an inherent 600ohm
impedance at 20kHz and a 2k impedance at its low frequency
resonance (about 50Hz). If you set the input impedance to 10k
ohms your result would be a 0.25dB drop at 20kHz. This would
also drop the low frequency resonance by 1.3dB. Compare this
to a typical mixer input (3k input impedance) where you would
get a 0.75dB drop at 20kHz and 3.6dB at resonance.
7
So increasing the input impedance seen by the mic using the
impedance pots on the Dual P will result in an optimum
performance from the ribbon mic used. If the preamp or mixer
input impedance is too low then you will start to limit the
frequency response of the ribbon mic. When this occurs, the
low-end of the microphone’s sound quality will be limited and
the transient response will sound flat degrading the overall
performance of the microphone. So by adjusting the impedance
pot on the Dual P, you can achieve a clean full frequency
response from your microphones using the Dual P.
The beauty of the P-1 may be the ability to operate at
higher impedance or control the impedance vs. the mixer1
you are currently using.
1 A Phantom power capable input has around 13K maximum
impedance simply due to the 6.8k Phantom power pull-up
resistors.
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