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User's Manual
ENGLISH
iA231F/iA231FD
Dual Channel 31-Band Digital Graphic Equalizer with
Feedback Detection
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1. Re ad the se ins tr uctions before operatin g th is
apparatus.
2. Keep these instructions for future reference.
3. Heed all warnings to ensure safe operation.
4. Follow all instructions provided in this document.
5. Do not use this apparatus near water or in locations
where condensation may occur.
6. Clean only with dry cloth. Do not use aerosol or liquid
cleaners. Unplug this apparatus before cleaning.
7. Do not block any of the ventilation openings. Install
in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
ampliers) that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide
blade or the third prong is provided for your safety. If
the provided plug does not t into your outlet, consult
an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or
pinched particularly at plug, convenience receptacles,
and the point where they exit from the apparatus.
11. Only use attachments/accessories specied by the
manufacturer.
12. Use only with a ca rt, stan d, tr ipod, br acket, or
table specied by the manufacturer, or sold with
the apparatus. When a cart is used, use caution
wh en moving the c ar t/ ap paratus
combination to avoid injury from tipover.
13. Unplug this apparatus during lighting
st or ms or wh en unu se d fo r lo ng
periods of time.
14. Refer all servicing to qualied service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate
normally, or has been dropped.
IMPORTANT SAFETY INSTRUCTIONS
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK)
NO USER SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL
!
The lightning ash with arrowhead symbol, within an equi-
lateral triangle, is intended to alert the user to the presence
of uninsulated “dangerous voltage” within the product’s
enclosure that may be of sufcient
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is in-
tended to alert the user to the presence of important operat-
ing and maintenance (servicing) instructions in the literature
accompanying the appliance.
WARNING: To reduce the risk of re or electric shock, do
not expose this apparatus to rain or moisture.
CAUTION: Use of controls or adjustments or performance
of procedures other than those specied may result in
hazardous radiation exposure.
!
The apparatus shall not be exposed to dripping or splashing and that no objects lled with liquids, such as vases,
shall be placed on the apparatus. The MAINS plug is used as the disconnect device, the disconnect device shall
remain readily operable.
Warning: the user shall not place this apparatus in the conned area during the operation so that the mains switch
can be easily accessible.
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TAB LE OF CO NTE NTS
page
31-BAND DUAL CHANNEL EQUALIZER
iA231F / iA231FD
Phonic reserves the right to improve or alter any information supplied within this document without prior notice.
V1.0 NOV 19,
Introduction .....................................................................................................4
Features............................................................................................................4
Getting Started ................................................................................................5
Basic Setup......................................................................................................5
Controls and Settings .....................................................................................6
Front Panel........................................................................................................... 6
Back Panel ........................................................................................................... 7
Operation .........................................................................................................8
Feedback Control ................................................................................................ 8
Channel Equalization .......................................................................................... 8
Large Room Equalization ................................................................................... 8
Quick Tips ............................................................................................................ 8
Application.......................................................................................................9
Frequency Chart ............................................................................................ 10
Specications ................................................................................................ 11
Dimensions .................................................................................................... 13
WITH DIGITAL FEEDBACK DETECTION
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PHONIC CORPORATION iA231F / iA231FD User's Manual
INTRODUCTION
We at Phonic would like to congratulate you on making
the wise choice in investing in an all new iA231F or
iA231FD graphic equalizer, analog in appearance, but
purely digital on the inside.
The iA231F and 231FD are dual channel, 1/3 octave 31band graphic equalizers with 6 or 12 dB of boost or cut
to ISO standard frequencies between 25 Hz and 10 kHz,
giving you, the user, ultimate control over your audio
quality in most any situation.
Featuring feedback elimination, a handy take-it-orleave-it delay control, as well as a nifty high pass lter,
allowing for those troublesome and mind-numbingly
pointless low-frequency sounds to be removed without a
hassle, the iA series takes care of various needs that any
regularly equalizer would no doubt forget.
Provided your iA equalizer is used correctly, it should
provide you with many years of valuable use; which is
why we have included this handy user's manual. Read
on, dear friend, and you shall nd tips and hints and
such, the likes of which no other equalizer user's manual
has ever offered. And if that doesn't sell you on reading
through this manual, perhaps you could do it anyway,
storing it afterwards in a place you can remember and
nd later, if need be.
FEATURES
l
Professional DUAL 31-band, 1/3 octave stereo
Graphic Equalizer
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30mm VR for precise adjustment
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Feedback Detection System instantly reveals critical
frequencies and can also be used as Audio Analyzer
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Built-in limiter control form -20 dB to +20 dB (OFF)
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Variable low-cut lter, 15 to 400 Hz (off), and high-cut
lter, 2.5 to 30 kHz (off)
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Switchable boost/cut range between 6 dB and 12 dB
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EQ IN/OUT switch
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I/O level meter switch
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Dedicated mono subwoofer output with adjustable
crossover frequency
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+15dB to -∞ input gain range for easy level matching
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Stereo link function
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8-segment LED meter with clip warning for input
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Illuminated fader
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Servo-balanced outputs with 1/4” TRS and XLR
connectors
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Digital AES/EBU XLR and S/PDIF RCA connectors
(iA231FD only)
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PHONIC CORPORATION iA231F / iA231FD User's Manual
GETTING STARTED
The following are a few helpful hints Phonic would like
you to keep in mind while using or preparing to use your
iA equalizer. You can follow at your own discretion,
however it should be noted that heeding these notices
can help to ensure a greater quality of sound, protect
you against damaging your equalizer, and help to ensure
you just have an all round pleasant experience with the
product.
1. Check the AC voltage before connecting the plug.
This product is equipped with a 3-wire grounding
type plug; this is a safety feature and should not be
defeated. Proper grounding must be practiced to
prevent electrical shock to the operator. Choose the
main supply for the sound system with care, and do
not share sockets or earthing with light dimmers.
2. Run audio cables separately from dimmer wiring,
using balanced lines wherever possible. If necessary,
cross audio and lighting cables at right angles as
to minimize the possibility of interference. Keep
unbalanced cabling as short as possible.
3. Check your cables regularly and label each end for
easy identication.
4. Before switching on the main power, keep all the
output rotary faders all the way down to prevent
damage or excessive noise caused by bad level
adjustment, wrong wiring, defective cables, or bad
connections.
5. Always turn the iA equalizer before the power
amplier, and be sure to turn the equalizer off after
turning off the amplier.
6. Always turn off the power before connecting or
disconnecting the unit.
7. Never use solvents to clean the unit. Clean with a
soft, dry cloth.
BASIC SETUP
Connecting your iA EQ to your audio system could not
really be easier, though there are a few ways you can go
about it. The following is the preferred order of set up,
though you may detour slightly from this, if need be.
1. Feed the output of your mixer into the XLR or 1/4"
analog inputs. If using the iA231FD, you may prefer
to use a digital signal, in which case you should
connect your S/PDIF output to the iA’s RCA S/PDIF
input, or XLR AES input and adjust the input select
switch accordingly.
2. Connect either active speakers or the input of an
amplier to the XLR or 1/4" analog outputs of the iA
equalizer. Once again, if you are using the iA231FD,
you may also like to use the S/PDIF output to feed to
a digital recorder or other product that accepts digital
signals.
3. If you would like to use one of the Sub outputs of the
iA equalizer, you’re more than welcome to. Simply
plug the active subwoofer’s input or amplier’s input
to the XLR sub output jacks. Adjust the included low
pass lter to a level of your liking.
4. Plug the provided AC power cable into the power
connector of the iA equalizer and appropriate AC
power source. Check local voltages if traveling
abroad, just in case.
5. Turn on your mixer and equalizer, followed by the
rest of your equipment, and do what you do.
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Front Panel
1. LED Indicators
With two colors and 8 segments; the LED indicators
visually represent the output level of the equalizer.
The clip button indicates when the input (or output, as
designated by the I/O Meter button) signal is too high,
and is dynamically clipped as to protect the internal
circuitry.
2. Range Button
Selects maximum cut or boost for the equalizer of either
6 dB or 12 dB, and the indicator will light up to show
you which level range you are using. The 12 dB settings
should be used when much equalization is needed; the
6dB setting allows for ner adjustments on the frequency
levels.
3. EQ IN/OUT Switch
Push this button in to add the equalizer into the signal
path, push again to raise the button and remove the
equalizer section from the signal path. This switch does
not defeat the low or high cut lters.
4. Input Level Control
Turn this knob to adjust the input level from -∞ dB to
+15 dB.
5. I/O Meter Button
This button allows users to alternate the use of the
LED level meter between the input and output signals.
When pushed in, the level meter will give users a
clear representation of the input signal, whereas when
the button is released, the output signal will then be
analyzed instead.
6. Feedback Detection Button
Pushing this button activates the built-in feedback
detection system of he iA equalizer. Frequencies with
the potential for creating feedback are indicated by
ashing LEDs on each frequency’s VR fader.
7. Low Cut Control
This knob enables a subsonic lter range from 15 Hz to
400 Hz. Its function is to "roll off" the response below a
given frequency to eliminate subsonic interference like
wind noise, stage rumble, and microphone "pop". This
function, independent of EQ IN switch, is disabled when
set to the OFF position.
8. High Cut Control
This knob enables a super-to-ultra-sonic lter range
from 2.5 kHz to 25 kHz. Its function is to "roll off" the
response above the selected frequency to eliminate
high frequency interference, unwanted noise and hiss
that may be present at high frequencies. This function,
independent of EQ IN switch, is disabled when set to the
OFF position.
9. Limiter Control
This control is used to select the threshold of the iA
equalizer's built-in limiter. It allows users to adjust the
limiter from -20 to +10 dBu, or turn it off all together.
10. Link Button
By pushing this button, any settings made to channel
1 are applied to channel 2. This is helpful so that when
stereo signals are sent through channels 1 and 2 of the
iA equalizer it is not necessary to set both channels'
faders.
11. Faders
Smooth operation with center detent and accurate at
setting, these faders allow users to boost or cut their
signal’s various frequencies by up to 12 dB. If the Range
button is pushed in, the level of boost and cut is then 6
dB.
CONTROLS AND SETTINGS
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Back Panel
12. Power Switch
This switch simply turns the iA equalizers on and off.
13. Power Input and Fuse
Power is supplied via an IEC standard 3-pin connector.
The power supply fuse is located in a fuse holder tted
into the rear panel. Always replace with the correct type
and rating of fuse, as indicated adjacent to the fuse
holder.
14. S/PDIF Input and Output (iA231FD only)
These RCA S/PDIF jacks are for the input and output
of digital signals, allowing audio to be passed from one
device to another without having to convert the signal
from digital to analog and back again. To use the S/PDIF
inputs, the Input Select switch must be set to allow the iA
equalizer to accept the signal. The output sampling rate
is selected using the Output Select switch. This feature
is available on the iA231FD only.
15. Sampling Rate Switch (iA231FD only)
This switch allows users to adjust the output sampling
rate of the S/PDIF output between 44.1 kHz, 48 kHz
and 96 kHz per second. This feature is available on the
iA231FD only.
16. Input Select Switch (iA231FD only)
By using this switch, users can adjust the input of the
iA equalizer between that of the Analog inputs and that
of the Digital inputs.. This feature is available on the
iA231FD only.
17. AES Input and Output (iA231FD only)
These XLR AES/EBU (also known as AES3) standard
input and output connectors can be used to receive and
send digital signals to and from various digital signal
processors, recorders and other products that feature
digital interface abilities.. This feature is available on the
iA231FD only.
18. Subwoofer Output and X-Over Control
The 3-pin XLR output is for the output of low frequency
sounds, suitable for use in conjunction with subwoofer
speakers. The subwoofer crossover frequency can be
selected between 20 to 250 Hz by the small control
located next to the output.
19. Analog Inputs and Outputs
The female XLR inputs are for the addition of external
analog signals to the iA equalizers, whereas the 3-pin
XLR outputs are for the connection of external devices
to receive the equalized signal. There are also input
and output operating level switches, which allow users
to adjust the iA equalizer to suit either pro and semipro audio equipment, as well as consumer level audio
products. Set at +4 dBu for professional audio products,
and -10 dBV for consumer products.
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Feedback Control
In live performance applications, graphic equalization
is almost always applied separately to stage monitors
or foldback systems to reduce the level of frequencies
that would otherwise cause feedback problems. These
problems occur due to peaks in the frequency response
curves of the monitor speaker system, as well as due to
monitor positioning and sound reected from the stage
walls.
The iA graphic equalizer features a feedback detection
systems that, when activated, will allow users to
recognize problem frequencies by illuminated LEDs on
the VR sliders. When this occurs, and if the feedback is
audible, simply reduce the affected frequencies until the
feedback becomes inaudible and/or the LED goes out.
Of course, feedback may be inadvertantly detected
by the device if the signal includes an abundance of
frequencies similar to those of feedback (some electric
guitars, for example). If this is the case, simply ignore the
detected "feedback".
The iA graphic equalizer can be used to provide some
control over moderate feedback problems, but does not
have enough exibility or resolution to handle severe
situations.
If you nd feedback points covering many equalizer
bands and cutting every band doesn’t help, then it
would be advisable to reduce the system gain. The
combination of a graphic equalizer for tone control and
a parametric equalizer for feedback control is highly
recommended.
Channel Equalization
Many mixers provide only simple equalization for
individual channels, typically two or three bands. If your
mixer has channel inserts, you can patch your equalizer
into a channel that is being used for something important
and use it to tailor the sound of this channel exactly the
way you need for your setting.
Large Room Equalization
Large venues tend to suffer from multiple reections
with long delays and reverberation times; all of which
lead to reduced intelligibility and a generally muddy
sound. As sound travels long distances through the
air, high frequencies are attenuated more than low
frequencies. In general, a large room benets from
some low frequency roll-off and some high frequency
boost. Therefore, reducing the low frequency output
may produce real advantages in buildings made from
concrete or stone, where much of the bass is reected
rather than absorbed. Also rolling off the high frequency
end above 5 kHz may also contribute to a more natural
sound. Depending on the individual sound system and
the environment, the shape of the optimum house curve
will vary and a degree of experience is needed in order
to achieve the best result.
Quick Tips
Using the low cut lter will remove stage rumble and
various low-frequency feedback signals that may cause
your sound to lose it's crispness. Audition a few LCF
settings before deciding which is best for you.
Be sure to choose the optimal position for your speakers,
because no matter how much equalization you have, if
your audio is bouncing off walls and oors, it can still
sound dull.
Using a Personal Audio Analyzer with an EQ setting
function will allow you to determine how to set your
equalizer up without a fuss. In live gigs, it is strongly
suggested that this measure be taken to get the most
out of your audio.
OPERATION
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PHONIC CORPORATION iA231F / iA231FD User's Manual
APPLICATION
In The Speaker Path with Digital Recording
use the iA EQ as
a channel insert
use the iA EQ with
passive speakers
use the iA EQ with
active speakers
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FREQUENCY CHART
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SPECIFICATIONS
Analog inputs
Type balanced input stage
Connector XLR and 1/4" TRS
Impedance 40 kohm
Maximum input level +16dB
Analog outputs
Type servo, balanced output stage
Connector XLR and 1/4" TRS
Impedance 600 ohm
Maximum input level +16 dB
Digital I/O
Type AES/EBU (XLR), S/PDIF (RCA)
Format 24Bit/96 kHz
Sample Rates 44.1 kHz / 48 kHz / 88.2 kHz / 96 kHz
System
Frequency response 20 Hz to 20 kHz +/- 1 dB
THD 0.012% typ @ +4 dBu 1 kHz
Crosstalk <-77 dB
Noise <-77 dB
Graphic equalizer
Type digital 1/3-oct EQ
Frequency range 20 Hz to 20 kHz, 1/3-oct 31 bands ISO frequencies
Bandwidth 1/3 octave
Control range +/-6 or +/-12 dB
Filter
Type 18 dB/oct, Butterworth
Low-Cut variable 10 Hz to 400 Hz
High-Cut variable 2.5 kHz to 30 kHz
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PHONIC CORPORATION iA231F / iA231FD User's Manual
Limiter
Attack/Release 20 ms / 85 ms
Threshold -20 dB to +20 dB (OFF)
Sub out
Frequency range 16 Hz to 250 Hz
Function switch and Controls
FB. D Feedback detection system
EQ in switch to active and bypass equalizer function
I/O meter switch meter display from input and output
Range switch cut/boost range from +/- 6 dB to +/- 15dB
Limiter variable -20 dB to +20 dB (OFF)
Sub out variable 20 Hz to 250 Hz
Link switch on/off
Input select analog / AES / SPDIF (only iA231FD)
Clock out sampling select 44.1 / 48 / 96 kHz (only iA231FD)
Indicators
Level meter 8-segment LED display
-24 / -18 / -12 / -6/ 0 / +6 / +12 / clip
Limiter LED (RED)
Power supply
Main voltage 100 to 240 V~ , 50 - 60 Hz
Power consumption 20W
Fuse 1A
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DIMENSIONS
measurements are shown in mm / inches
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