Art RP-1 User manual

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.

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

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.

Connections

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.

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.

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.

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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