Radial Engineering Q3 User's Guide

®

™

Q3

Coil Equalizer

500 Series Module

True to the Music

User Guide

www.radialeng.com

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam
British Columbia, Canada, V3C 5M5
tel: [phone] • fax: [phone]
email: [e-mail]

True to the Music

www.radialeng.com

Radial® Q3™ Coil EQ User Guide

Table of Contents ......................................................Page

Feature set ..................................................................... 1

Overview ........................................................................ 2

Getting started ................................................................3

Using the coil EQ ........................................................... 4

Preset curves .................................................................6

Suggested settings .........................................................9

User settings records ..................................................... 12

Specifi cations ................................................................. 13

Block diagram ................................................................ 13

Warranty ............................................................Back cover

Thank you for joining the growing number of Radial 500 series module users. We are
confi dent that you will fi nd the Q3 Coil Equalizer to be a great addition to your recording
studio setup. And although the Q3 is ‘plug and play’ easy to use, we recommend that you
take a few minutes to read through this manual to familiarize yourself with the design and
more importantly, the reasoning behind the way we created it.

If for some reason you do not fi nd all of the answers to your quest, we suggest you log
onto radialeng.com and peruse the Q3 Coil Equalizer FAQ section. This is where we post
questions and answers from users like yourself along with the latest updates. If you do not
fi nd what you are looking for, feel free to send us an email at [e-mail]. We will do
our very best to get an answer to you in short order.

Now reach out, close your eyes, turn the dials and listen. You are about to hear Nirvana!
(without all of the grunge)

WARNING NOTICE TO USER!

Although preventative safety measures have been designed into Radial
500 series products we strictly advise against hot-swapping modules
or plugging and unplugging them when the Workhorse or other 500 series
rack is powered on. Hot swapping can cause connection sparks at the card­edge connector that could send damaging transients to other equipment.
This also greatly reduces the life span of the card-edge contacts. Damage
due to hot swapping is not covered under warranty. There are no user
serviceable parts inside.

True to the Music

FEATURE SET

1. HIGH BOOST - 12 position rotary
switch features a wide variety
of high-frequency preset curves
designed to add clarity, shimmer and
presence to the voice on instrument.

2. SHIFT - This two position toggle
switch changes the slope and
amplitude of the preset curve. The
SHIFT position offers an steeper
EQ slope with increased amplitude
creating a more pronounced effect.

3. MID CUT - 12 position rotary switch
presents an array of eleven preset
curves, most of which are designed
to cut mid frequencies where the
human ear is most sensitive.

4. BASS BOOST - 12 position rotary
switch is outfi tted with eleven preset
curves designed to boost bass and
add warmth, body and punch to the
audio track.

5. HPF - High-pass fi lter rolls off
excessive low frequencies that can
cause resonant feedback on a live
stage or clutter up the bottom-end of
a track when mixing.

6. GAIN - Adjustable level control
allows you to compensate for the
EQ amplitude boost or cut and
maintain unity gain through the Q3.

7. EQ IN - This switch lets you
compare the original program
material with the effect introduced by
the passive inductor coil EQ circuit.
The LED indicator will illuminate
when the EQ is engaged.

8. OMNIPORT - Unbalanced ¼” TRS
input and output receives a signal
from an external device, processes
it throught the Q3 and outputs the
signal at the Omniport.

®

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3

2

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7

Rear Panel

Rear Panel

8

Radial Engineering Ltd.

1

Q3 Coil Equalizer 500 Module

®

p

True to the Music

OVERVIEW

The Radial Q3 is different... it does not follow tradition. The usual 3-knob EQ approach is
to select a frequency band using some sort of rotary switch, then set the Q or width of the
peak frequency and then adjust the amplitude of the effect to suit. To create truly usable
audio curves, you really need to combine multiple frequency bands together and mix their
effects. In other words, to recreate the type of curves we have conjured up inside the Q3, you
would need at least two bands and 6 control knobs. This is ‘practically’ impossible in a small
format module like the 500 series as the controls would be so tightly packed, they would be
unusable.

FREQ Q GAIN

630

500

800

400

1k

350

1.2k

1.5k

250

2k

100

-15dB +15dB

To fi t a coil EQ into the 500 series format, a completely different approach was needed. The
Q3 changes convention by giving the user a mind-numbing selection of over 12,000 EQ
possibilities using only three knobs and a few switches. Each 12 position switch is packed
with 11 preset curves that have been carefully selected after exhaustive listening tests.
These were evaluated on voice, bass, acoustic guitar, electric and on drums and compared
using both dynamic and condenser microphones.

We then set about testing how each curve would sound in tandem. There is no doubt that
while some curves will sound amazing on bass, the same curve may not suit mandolin. But
with well over 12,000 combinations, you will surely fi nd lots of very usable sounds.

High Boost

10

+8

+6

+4

+2

0

-2

-4

-6

-8

-10

20 20k50 100 200 500 1k 2k 5k 10k

Mid Cut

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-6

-8

-10

++=

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-18

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Bass Boost

10

+8

+6

+4

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0

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-8

10

20 20k50 100 200 500 1k 2k 5k 10k

Hz

Composite Curve

10

+8

+6

+4

+2

+0

-2

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-8

10

20 20k50 100 200 500 1k 2k 5k 10k

The 3-knob user interface is so natural and easy to use, that you will be amazed at how
quickly you will become accustomed to it. And once you get started, you will fi nd favourites
that will surely become cornerstones of your recording process.

Radial Engineering Ltd.

2

Q3 Coil Equalizer 500 Module

True to the Music

®

GETTING STARTED

Making connections

Before making any connections, start by turning off your audio system and turning all
volume levels down. This helps protect equipment from turn-on transients that could damage
loudspeakers and other sensitive equipment. We recommend using a power bar with a
switch as this makes it easy to turn on and off the 500 series rack, monitors and so on, using
a single switch. Carefully plug the Q3 into your 500 series rack avoiding stress on the card
edge connector. Screw the module in to ensure it does not accidentally become dislodged.

Connections between the Q3 and the recording or PA system are made at the rear panel of
your 500 series rack. Most 500 series racks are equipped with XLR connectors. When you
plug the Q3 module into your 500 series rack, it will automatically route the card-slot input
and output XLR jacks to the module. With the Radial Workhorse 500 series rack the I/O is
augmented with ¼” TRS connectors, D-Subs and the Mix Buss signal to feed the Workhorse
mixer section.

Start by setting up the controls as follows:

1. Set all HIGH, MID and BASS frequency band controls to the OFF position.

2. Make sure all three ‘SHIFT’ switches are pushed to the left (bold effect).
This will help you to choose a preset curve that works best for the instrument at hand.
Once selected the effect can be pulled back by toggling the SHIFT switch to the right.

3. Set the HIGH PASS FILTER to off (outward position).

4. Set the GAIN control to the 12 o’clock position.

5. Set the ON switch to bypass (EQ circuit out).

The Q3 is a line level device. In other words, it is designed to take the output from a mic
preamplifi er or pre-recorded track and process the signal before sending it along to a
dynamic processor, effects device or back to the recorder.

MIC PREAMP

Radial Workhorse or other 500 Series Rack

GAIN

COIL EQ

Q3 OUTPUTQ3 INPUT

It is important to note that the GAIN control is always active. In other words, when you hit the
bypass switch, you are actually bypassing the coil EQ circuits. This enables you to switch the
EQ in and out to compare the effect at the same gain settings.

Connect the source to the Q3, connect the output from the Q3 to your recording system...
turn it on. Listen. You should hear audio. If not, check your connections. To check the power
going to the Q3, depress the EQ IN switch. The LED will illuminate if power is present in your
500 series rack. Now familiarize yourself with the GAIN control to check sound levels. If all is
good, return it to the 12 o’clock start position.

Radial Engineering Ltd.

3

Q3 Coil Equalizer 500 Module

®

True to the Music

Using the Coil EQ

The Q3 features three 12 position rotary controls that are designated as BASS, MID and
HIGH. Each of these features on OFF position and 11 preset curves. Using a simple
microphone and a set of headphones, start by familiarizing yourself with the various EQ
curves in each band. As some of the EQ curves are very dramatic, using headphones will
help to eliminate feedback from occurring.

Note that the HIGH and BASS bands are made up of mostly boost type presets while the
MID band is made up of mostly cuts. This follows the way we humans like to ‘hear’ sound.
Keep in mind, the Q3 is not intended to be a surgical tool, it is designed to enthral and excite.

When using subtractive curves, you will notice that the sound level will appear to drop. This
is normal. Simply adjust the level by increasing the GAIN control to compensate. Be careful!
The Q3 has lots of gain!

CAUTION!

One of the drawbacks to passive coil EQs is that there is no noise preventative circuitry
between the induction coil circuit and the signal path. This means that when you switch
coils, you can encounter clicks and pops. Always monitor at reduced levels while setting
up the Q3. This will help avoid popping which in turn could damage more sensitive
equipment.

Using the ‘Shift Key’

One of the cool features on the Q3 is the SHIFT switch. When set to the right, the effect of
each curve is gentler. When moved to the left, it is bolder and more prevalent. This enables
you to listen to various curves to determine if the general effect is going in the right direction
and then lets you either add or subtract the effect, depending on your musical taste.

+2

0

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G

-8

%
X

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-16

-18

20 20k50 100 200 500 1k 2k 5k 10k

The dashed line represents the standard curve and the solid line represents the “shifted” curve.

Hz

Note: As the space between the 12 position rotary switches is very tight, the easiest way to
move the shift switch is to use a pen or tweaker. This is the downside to jamming all of this
control into a 500 series format!

Radial Engineering Ltd.

4

Q3 Coil Equalizer 500 Module

True to the Music

Using the High-Pass Filter

The Radial Q3 is equipped with a switch labelled HPF that stands for high-pass fi lter. What
this switch does is exactly that... it allows the high frequencies to pass... therefore cutting
out some of the lows. The HPF can be very effective when recording to eliminate excessive
bottom-end. Some EQ settings can cause certain instruments to sound muddy and clutter
up the recording. Keep in mind that bass frequencies contain a lot more energy than highs,
so they affect dynamic range and distortion. High-pass fi lters are also a ‘God-send’ in live
touring as cutting excessive bottom end eliminates resonance which is the primary cause of
feedback. Simply press, listen and then take out to compare.

Using the Omniport

When the Q3 is used with a Radial Workhorse or one of our other 500 series power racks,
the Omniport connection becomes available and in this case, it functions as an unbalanced
input and output.

Radial Workhorse or other 500 Series Rack

GAIN

COIL EQ

OMNIPORT I/O

EXTERNAL

DEVICE

Q3 OUTPUTQ3 INPUT

®

While the XLR and ¼” TRS jacks on the Workhorse are balanced, the Omniport connection is
unbalanced making it easy to connect to the unbalanced insert patch point on a console. Note
that the balanced XLR I/O should be left unconnected when using the Omniport function. The
easiest way to connect to the Omniport would be to use a TRS-to-TRS cable. Simply make
sure the wiring is confi gured as follows:

TIP

RING

SLEEVE

Q3 Omniport

Tip = Input
Ring = Output
Sleeve = Ground

Q3 Coil Equalizer 500 Module

SOURCE

Tip = Send
Ring = Receive
Sleeve = Ground

Radial Engineering Ltd.

TIP

SLEEVE

RING

SHIELD

5

®

g

10

True to the Music

Q3 PRESET EQUALIZATION CURVES

Although printing the preset curve data is somewhat superfl uous, we have decided to include
it in the manual so that you can get a ‘visual’ of what each individual preset curve looks like.
DO NOT get caught looking at curves to make audio decisions. Use your ears! Once you
get started, you will fi nd that getting around the Q3 will be very natural and incredibly quick.

HIGH BOOST PRESETS

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+5db High Shelf with 8KHz Notch

Radial Engineering Ltd.

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+7db @ 7 KHz

Q3 Coil Equalizer 500 Module

True to the Music

Q

Q

Q

MID CUT PRESETS

®

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High Cut @ 2.4 KHz

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High Cut @ 1 KHz

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Radial Engineering Ltd.

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-10db @ 1.5 KHz Shaped -12db @ 3.5 KHz Shaped

7

Q3 Coil Equalizer 500 Module

®

BASS BOOST PRESETS

True to the Music

+10

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3

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1

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Radial Engineering Ltd.

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+9db @ 600 Hz +18db @ 60 Hz

8

Q3 Coil Equalizer 500 Module

Hz

True to the Music

SUGGESTED SOUND SETTINGS

®

NAME:

Jazzy Bass

Inst:

Fender Jazz
Bass

Pickups:

Neck PU

HPF:

Off

NAME:

Bright
Reggae

Inst:

Fender
Stratocaster

Pickups:

Singlecoil
Bridge &
Middle PU

HPF:

Off

NAME:

Marcus Funk

Inst:

Fender Jazz
Bass

Pickups:

Both

HPF:

On

NAME:

Quiet
Moment

Inst:

Gibson
Les Paul

Pickups:

Humbucker
Neck PU

HPF:

On

NAME:

Smooth
Frettless

Inst:

Fender
Frettless
Jazz Bass

Pickups:

Neck PU

HPF:

On

NAME:

Finger Pickin’

Inst:

Acoustic

Pickups:

Magnetic in
Soundhole

HPF:

Off

Radial Engineering Ltd.

9

Q3 Coil Equalizer 500 Module

®

SUGGESTED SOUND SETTINGS

True to the Music

NAME:

Strumming
Sunday

Inst:

Acoustic
Guitar

Pickups:

Piezo &
Magnetic

HPF:

On

NAME:

Sticky Pop

Mic:

Condenser
Vocal

HPF:

On

NAME:

Call Me Elvis

Mic:

Dynamic
Vocal

HPF:

On

NAME:

Fat Girl

Mic:

Condenser
Vocal

HPF:

Off

NAME:

FM Radio

Mic:

Dynamic
Vocal

HPF:

Off

NAME:

Open Kick

Inst:

Kick Drum

HPF:

Off

Radial Engineering Ltd.

10

Q3 Coil Equalizer 500 Module

True to the Music

SUGGESTED SOUND SETTINGS

®

NAME:

Stupid Bass

Inst:

Kick Drum

HPF:

Off

NAME:

Big Chest
Snare

Inst:

Snare Drum

HPF:

Off

NAME:

Slap Kick

Inst:

Kick Drum

HPF:

Off

NAME:

In Your Face
Snare

Inst:

Snare Drum

HPF:

On

Radial Engineering Ltd.

11

Q3 Coil Equalizer 500 Module

®

USER SOUND SETTINGS

True to the Music

NAME:

Inst:

HPF:

GAIN:

NAME:

Inst:

NAME:

Inst:

HPF:

GAIN:

NAME:

Inst:

NAME:

Inst:

HPF:

GAIN:

NAME:

Inst:

Radial Engineering Ltd.

HPF:

GAIN:

HPF:

GAIN:

12

Q3 Coil Equalizer 500 Module

HPF:

GAIN:

True to the Music

Q3 COIL EQUALIZER 500 MODULE SPECIFICATIONS*

Circuit type .................................... Coil/Capacitor/Resistive Boost and Cut Filters

Frequency Response ...................20Hz-20KHz +/- 1db in non EQ positions

Dynamic Range ............................ >112dB

Noise ............................................<-90dBu (600 ohm source impedance - fi lters Off)

Noise ............................................<-87dBu (600 ohm source impedance - fi lters On)

Output Headroom ......................... +27dBu

Clip Level - Input ........................... >+20dBu

Clip Level - Output ........................+27dBu

THD+N .........................................<0.003% (0dbu input at 1 KHz)

Intermodulation Distortion ............. <0.002% (0dbu input)

Input Impedance ...........................12K balanced

Output Impedance ........................ 440 Ohms balanced

Equivalent Input Noise .................. -100dbu

Gain .............................................. 7db (at maximum, EQ bypassed)

Omniport Function ........................ Unbalanced Input / Output (input = tip; output = ring)

Power Requirement ......................25mA

Shipping Dimensions: ...................171 x 51 x 229mm 0.7 kg (6.75” x 2 “ x 9” 1.5 lbs.)

Warranty .......................................3 Years, transferable

®

CONNECTOR WIRING

XLR Connector

GROUND

2

1

3

BLOCK DIAGRAM*

2

1

3

XLR

INPUT

BALANCED

INPUT

RING=OUT

* Subject to change without notice.

Radial Engineering Ltd.

HOT (+)

COLD (-)

GAIN

CONTROL

OMNIPORT
UNBAL I/O

TIP=IN

TS ¼” Phone Connector

GROUND

HIGH PASS

FILTER

MID CUT

FILTER

1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11

MIDS BASS HIGHS

13

HOT (+)

BYPASS

TRS ¼” Phone Connector

GROUND

BOOST

FILTERS

BALANCED

OUTPUT

Q3 Coil Equalizer 500 Module

COLD (-)

HOT (+)

WORKHORSE MIX BUSS DRIVER

XLR

OUTPUT

MIX

BUSS

4.7K

12

3

THREE YEAR TRANSFERABLE LIMITED WARRANTY

RADIAL ENGINEERING L TD. (“Radial”) warrants this product to be free from defects in material and
workmanship and will remedy any such defects free of charge according to the terms of this warranty.
Radial will repair or replace (at its option) any defective component(s) of this product (excluding fi nish
and wear and tear on components under normal use) for a period of three (3) years from the original
date of purchase. In the event that a particular product is no longer available, Radial reserves the
right to replace the product with a similar product of equal or greater value. In the unlikely event that
a defect is uncovered, please call 604-942-1001 or email [e-mail] to obtain an RA
number (Return Authorization number) before the 3 year warranty period expires. The product must be
returned prepaid in the original shipping container (or equivalent) to Radial or to an authorized Radial
repair centre and you must assume the risk of loss or damage. A copy of the original invoice showing
date of purchase and the dealer name must accompany any request for work to be performed under
this limited and transferable warranty. This warranty shall not apply if the product has been damaged
due to abuse, misuse, misapplication, accident or as a result of service or modifi cation by any other
than an authorized Radial repair center.

THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE HEREOF
AND DESCRIBED ABOVE. NO WARRANTIES WHETHER EXPRESSED OR IMPLIED, INCLUDING
BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPECTIVE WARRANTY PERIOD
DESCRIBED ABOVE OF THREE YEARS. RADIAL SHALL NOT BE RESPONSIBLE OR LIABLE
FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM
THE USE OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND
YOU MAY ALSO HAVE OTHER RIGHTS, WHICH MAY VARY DEPENDING ON WHERE YOU LIVE
AND WHERE THE PRODUCT WAS PURCHASED.

This product is intended for professional use only.

The user should be familiar and experienced with

!

the 500 series rack and module format

®

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam, British Columbia, V3C 5M5
tel: [phone] • fax: [phone] • email: [e-mail]

True to the Music

www.radialeng.com

API, Lunchbox, Protools and Neve are registered trademarks of their respective owners.
Reamp, Reamper, Reamping and Workhorse are trademarks of Radial Engineering Ltd.
Copyright 2012 Radial Engineering Ltd. All rights reserved.
Specifi cations and appearances subject to change without notice.
Radial® Q3™ 500 Module User Guide Rev1.0 Feb. 2012 - Part #: R870 1258 00 Printed in Canada