Audio Control EQT Concert Series Owner/installer Instruction Manual
P/N 794-090
EQT
EQT
EQT
EQT
EQT
Specifications
All specifications are measured at 14.4 VDC
(standard automotive voltage)
Frequency response ............................................................... 10-20 KHz ±1 dB
Total harmonic distortion ...................................................................... 0.007%
Signal to Noise ratio (at full output) ...................................................... 110 dB
Maximum output level ........................................................................ 9.5 Vrms
Input gain ............................................................................................... ±18 dB
Output attenuation ............................................................................. -
∞ to 0 dB
PFM filter slope ............................................................................ 18 dB/Octave
PFM filter frequency ................................. Factory set at 33 Hz Programmable
Power supply ............................... Selectable isolation PWM DC/DC converter
Power draw ............................................................................................ 350 mA
Recommended fuse rating ....................................................................... 2 Amp
Size ................................................................................ 1.25"h x 8.9"w x 6.9"d
Weight ........................................................................................................ 3 lbs
Balanced Input ............................................................................................. Yes
Output: Ground Isolation Jumper ................................................................ Yes
Country of origin ........................................................................................ USA
© AudioControl 1998, AudioControl is a division of Electronic Engineering and Manufacturing, Inc. All
rights are reserved.
AudioControl, Performance Match, Making Good Stereo Sound Better, The Epicenter
tm
, 2XS
tm
and EQT
are all trademarks of Electronic Engineering and Manufacturing, Inc.
This manual was written, designed, printed and stuffed into a neat box with a really neat product while
fighting a life and death struggle with man-eating banana slugs (considering where we live).
Congratulations!
Congratulations!
Congratulations!
Congratulations!
Congratulations!
You have purchased one of the most powerful acoustical tools known to the car
stereo world - the AudioControl EQT. This thirty band wonder can take care of
almost any acoustic anomaly your car audio sound system can throw your way.
Normally, we include a really complete owner’s manual with our products. But the
EQT is radical...so mind-bogglingly, incredibly, gosh-darned sophisticated that it
definitely requires professional installation.
Since many installers generally use owners manuals to line bird cages, we’ve
pared down the instructions to a bare minimum in hopes that they will at least look
at this manual. However, since the best installers (like the AudioControl Perfor-
mance Match dealer who’s installing your EQTs) pass all owners manuals on to
their customers, we have also included some information for you, the end-user.
WARNING: We know what kind of awesome systems EQTs go into, so we suggest
reading the information before you damage yourself too badly by cranking your
stereo.
Here’s what you can expect from your EQT:
• Car Acoustic Problems Solved
Car Acoustic Problems Solved
Car Acoustic Problems Solved
Car Acoustic Problems Solved
Car Acoustic Problems Solved - Car interiors vary wildly in size and
acoustic make-up. So do doors and trunks, which due to enclosure volumes,
contribute significantly to the sound of speakers. Not to mention the literally
thousands of different types of speakers available; or all the different placements
which are possible. It’s mind (and ear) boggling. A couple of EQTs give your
dealer/installer the ultimate tools for solving these problems and optimizing the
sound of your overall system.
• Component Line Level Incompatibilities Eliminated
Component Line Level Incompatibilities Eliminated
Component Line Level Incompatibilities Eliminated
Component Line Level Incompatibilities Eliminated
Component Line Level Incompatibilities Eliminated - Unlike home
stereo systems, there are no exact standards for car stereo input/output levels. Head
unit output levels vary all over the map. Chaos everywhere. The result is often
improper level matching which can result in excessive noise or distortion. Your
system can now have perfect balance and a great signal-to-noise ratio.
• Tremendous Sound Control
Tremendous Sound Control
Tremendous Sound Control
Tremendous Sound Control
Tremendous Sound Control - Thirty bands of equalization with constant-
Q, (see the description on the next page) all engineered into a compact, rugged
chassis. The only other environments which usually get the benefit of true, 1/3
octave equalization are recording studios, high-end home theater systems, and
gigantic, multi-million dollar traveling concert sound systems.
• Highest Quality
Highest Quality
Highest Quality
Highest Quality
Highest Quality - Your EQT is built in Mountlake Terrace, Washington USA
(near Seattle). Our Performance Match series has regularly won many coveted
industry awards for design and engineering excellence. In fact the EQT won the
Audio/Video Magazine Autosound Grand Prix award almost before it was intro-
duced. It has also been selected as one of the FIVE BEST CAR AUDIO PROD-
UCTS EVER!
• Envious Friends
Envious Friends
Envious Friends
Envious Friends
Envious Friends - Even if they have an otherwise IDENTICAL system, you
can count on your system sounding better. Because even the finest custom system
can sound much better with the addition of the EQT.
22410 70th Avenue West • Mountlake Terrace, WA 98043
425-775-8461 • Fax 425-778-3166
www.audiocontrol.com
®
®
making good stereo sound better
®
®
Concert Series
30 Band One-Third Octave Constant-Q
Precision Equalizer / Preamplifier
Owner/Installer Manual
tm
Look what happens to the curve in Figure B. The bandwidth has changed
because the Q has changed! The increased adjustment at exactly 1000 Hz is
now causing effects well past its own third-octave bandwidth. You’re essen-
tially getting free, unsolicited equalization at 800 Hz and 1250 Hz as well. The
analyzer readout also shows that your pink foam dice hanging from the rear
view mirror are causing a 3 dB dip at 1250 Hz. So he boosts this frequency
(Figure C). Look what happens! Now both adjustments are interacting.
Figure C
Fade out. Fade in to an AudioControl Performance Match dealer as he
installs your EQT. First the 3 dB cut at 1000 Hz.
Now a 6 dB cut. The Q, that is the contour, of the equalization has
remained the same. That’s constant-Q topology at work. No matter how much
boost or cut, the adjustment stays right where it’s intended. Even when you
make an adjustment in the opposite direction right next door.
Previously, this feature was only found on ultra-sophisticated (read very
expensive) studio and sound reinforcement equalizers. Which wouldn’t even
begin to fit in your car even if you had hot and cold running 110 volts AC to
power the equalizer.
We Interrupt all this Great Bragging and Tech Talk
We Interrupt all this Great Bragging and Tech Talk
We Interrupt all this Great Bragging and Tech Talk
We Interrupt all this Great Bragging and Tech Talk
We Interrupt all this Great Bragging and Tech Talk
for a Very Important Announcement
for a Very Important Announcement
for a Very Important Announcement
for a Very Important Announcement
for a Very Important Announcement
FILL OUT AND SEND IN YOUR WARRANTY CARD! Also, save
your invoice or sales slip as proof of purchase. These actions will protect your
investment and help prove to your insurance company that you really owned
one (much less two) of such a great piece of audio gear like the EQT. Just in
case somebody “borrows” them while you’re tanning in Maui.
Generally Nifty Info for Owners.
Generally Nifty Info for Owners.
Generally Nifty Info for Owners.
Generally Nifty Info for Owners.
Generally Nifty Info for Owners.
Installers Already Know
Installers Already Know
Installers Already Know
Installers Already Know
Installers Already Know all this Stuff . . .
all this Stuff . . .
all this Stuff . . .
all this Stuff . . .
all this Stuff . . .
or at Least We Hope They Do
or at Least We Hope They Do
or at Least We Hope They Do
or at Least We Hope They Do
or at Least We Hope They Do
Constant-Q Equalization - Obviously, the more segments that the
frequency spectrum is split into, the more precise the control over any given
segment. But having beau-coup bands is not the whole solution.
Normal 1/3 octave equalizers suffer from variable “Q”. Okay, this is an
obscure term, even for a lot of autosound professionals. The Q (Quality Factor)
is the relationship of bandwidth to the amount of equalization. Time to haul
out the charts and graphs and other audio/visual aids.
Figure A is a standard 1/3 octave equalizer set to take a 3 dB notch out at
exactly 1000 Hz. When providing 3 dB of cut, the equalizer’s Q is:
Figure A
After using a 1/3 octave real-time audio analyzer, the uninformed non-
AudioControl-aware installer discovers that you really need 6 dB of cut at 1000
Hz. (Figure B)
Figure B