Aphex 188 User Manual
188
Remote Controlled 8 Channel Microphone
Preamplier
Instruction Manual
P/N 188-3200
Preliminary Rev 1
Released 01/23/09
Manufactured by
Aphex
3500 N San Fernando Blvd
Burbank, CA 91505
USA
Copyright 2009 Aphex. All rights reserved.
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Safety Declarations
CAUTION: For protection against electric shock, do not remove the cover. No user serviceable parts inside.
WARNING: This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the operating guide, may cause interference to radio communications. Operation of this equipment
in a residential area is likely to cause interference in which case the user will be required to correct the interference at his own
expense.
The user is cautioned that changes and modifications made to the equipment without approval of the manufacturer could void the
user’s authority to operate this equipment.
It is suggested that the user use only shielded and grounded cables to ensure compliance with FCC Rules.
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Table of Contents
1.Introduction
2.Quick Start
Front Panel LCD Display and Rotary Encoder/Switch
Front Panel Screens
3. Rear Panel
4. Model 188 block diagram and signal flow
5. Installation
6. Functions in Detail
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Introduction
Why remote controlled preamplifiers?
Locating the mic preamplifier as close as possible to the microphone eliminates the long cable runs at mic level.
Induced noise would be amplified. In addition, capacitance and resistance in that long cable run would affect
the performance of the microphone.
Transformer splitters are only eective in isolating ground. The impedance from all the preamplifiers connected
to the system as well as the cabling combine to load down the output of the microphone. For example- most
microphones are designed to drive between 1200 and 1500Ω loads. If a microphone is connected to three preamplifiers, the input impedance is 500Ω. The sonic eects are reduced frequency and transient response, and
higher noise. The increase in audio quality when the microphone is driving an ideal load is dramatic. The 188
acts like an active splitter with one analog and two digital outputs..
Once you have line level signal from the remote preamplifier make sure that you do not put that signal through
another preamplifier. Almost all consoles switch in a pad in front of their preamplifiers and label the input as
‘line’. If the trim pot still controls level, you are going through a preamplifier. It is best to use an insert return
for an analog line level signal. You will be amazed at how much better everything sounds!
If you are using a digital console without any analog input other than a preamplifier, we strongly recommend
converting the output of the remote preamplifier to digital. We designed a high quality A/D into the Model 188
for that purpose.
The Model 188 and its big brother the Model 1788A fulfill all the requirements for a remote controlled preamplifier- great audio, easy to control, no glitches, pops or zipper noise, and multiple outputs.
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Quick Start
Rotary Encoder and Switch
Rotate the encoder clockwise or counterclockwise to scroll between screens. Press the encoder to make the cursor appear within a screen. Rotate the encoder to move the cursor to
the value or status to be changed and press to select, the cursor will start blinking. Rotate
the encoder to change the value or status. Press the encoder to save the value or status.
Start Up
The first screen shows the firmware version that is loaded into the
Model 188. It is a good idea to check the Aphex website occasionally to see if there are any updates. Updating the firmware is covered in section----
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Metering
This screen shows a twelve segment peak level meter for each channel.
When there is an overload the clip on that channel is indicated with a “!”.
When the unit receives a command from a remote controller, “RC” will
light for half a second. We recommend that this screen be selected when
set up is complete.
Channel Status and Input Gain
188
There is one screen for each of the eight channels. Each screen indicates
Channel number, gain, status for Polarity Reverse, Pad, Low Cut Filter, and
Phantom Power functions. A check mark under the function indicates that it
is active. A dash indicates that it is not active.
The Input Gain is adjustable from 26 to 65dB.
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