Programmable Frequency Match (PFM) Filter
This module programmable low cut filter allows the system
designer to custom tune the bass response of the speaker system.
Smaller woofers can be protected against the voice-coil-charring
bass they are too small to reproduce. Tuned (Ported) subwoofer
enclosures benefit by having the frequencies below their tuning
cut off to reduce distortion and save system power.
Speaker Wave Alignment Technology (SWAT)
Speakers in a car stereo system have a lot to put up with;
different types of cars, different placement of speakers, different
brands of speakers. All of these things add up to a difficult time
for any installation. The Speaker Wave Alignment control takes
care of one of the most annoying (and hardest to fix) problems
with a turn of a knob: sound cancellation between speakers at the
crossover point. By allowing you to move the cancellations away
from the listener, the frequency response is smoothed out without
wasting a huge amount of the system’s power trying to fill an
acoustical black hole.
®
®
making good stereo sound better
®
22410 70th Avenue West • Mountlake Terrace, WA 98043
Phone 425-775-8461 • Fax 425-778-3166
www.audiocontrol.com
®
making good stereo sound better
®
®
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Concert Series
tm
Crossover with Speaker Wave Alignment
Technology
Owner’s Manual
Congratulations!
You have purchased one of the most innovative autosound
products available- The AudioControl 24XS. The 24XS will help
you make your stereo system sound its best. Please take a moment
to kick back, reflect on things and read this manual.
Features of the 24XS
• Sharp two way 24dB/octave electronic crossover
• Linkwitz-Riley alignment for minimum lobing error
• Speaker Wave Alignment Technology
• Programmable Frequency Match Filter
• Optimum output indicator LEDs
• Selectable power supply ground isolation
• Made in America
The Most Important Instruction of all
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 that you really
owned such a great piece of audio gear in case somebody takes a
liking to it while you’re tanning in Cabo.
Important
For the best product performance and the lowest use of Tylenol,
nothing is better than a professional system installation. Your
AudioControl dealer has the training and equipment to take care
of the job quickly and to get the best sound out of your system. If
you are a solid do-it-yourselfer then this manual should give you
all the information you need to successfully make music with the
24XS. Happy Listening.
Features
Programmable 24dB/Octave 2-way Crossover
With module programmability, the two way electronic crossover
in the 24XS can be matched up to any stereo system. By simply
changing a resistor module, you can select almost any crossover
frequency imaginable. The 24dB/Octave Linkwitz-Riley (a couple
of real nice audio engineers) design is normally reserved for the
best home and professional systems, but now this state of the art
crossover is yours also.
24XS Specifications
All specifications are measured at 14.4 VDC (standard automotive
voltage)
Frequency response .......................................................... 10-20 kHz ±1dB
Total harmonic distortion ............................................................... 0.007%
Signal to Noise ratio ......................................................................... 120dB
Maximum output level ................................................................. 9.5 Vrms
Crossover Slope ...................................................................... 24dB/Octave
Crossover type ......................................................... 2 Way Linkwitz-Riley
Programmable Crossover frequency ... Shipped @ 90 Hz (Programmable)
PFM filter slope ..................................................................... 18dB/Octave
PFM filter frequency ............................ Shipped @ 33Hz (Programmable)
Power supply .......................... Optically isolated PWM DC/DC converter
Power draw ...................................................................................... 250mA
Recommended fuse rating ................................................................ 1 Amp
Size ............................................................................ 1.2"h x 8"w x 5.7" d
Weight ................................................................................................... 3lbs
Balanced in ............................................................................................ Yes
Output ground isolation jumpers .......................................................... Yes
Country of origin ................................................................................. USA
©AudioControl 1998, AudioControl is a division of Electronic Engineering and
Manufacturing, Inc. All Rights Reserved
AudioControl
tm
, Performance Match
tm
, Making Good Stereo Sound Better
tm,
24XS
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 on a grey, misty day; considering where we live.
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A BRIEF TOUR OF THE 24XS
The Outside
OUTPUT LEVELS CONTROLS- These variable gain
controls adjust the high pass and low pass output levels indepen-
dently.
WAVE ALIGNMENT CONTROL- This control adjusts how
much the sound of a speaker is shifted. The internal switches
select whether this leans toward the high pass or low pass.
OUTPUT STATUS LEDS-
POWER: Shows when the 24XS is turned on (need we say
more?)
INPUT MAXIMIZED: Shows when the input levels are
within 3dB of clipping,
5 VOLT: Shows when the output levels are at five volts (make
certain your amplifier can handle this much input)
2 VOLTS: Shows when the output levels are at two volts (this
is a common input level for most amplifier manufacturers. Don’t
guess on this, check your amp’s owners manual to be certain.)
SPEAKER WAVE ALIGNMENT BUTTON-
Bypasses the speaker wave alignment circuitry for simple
comparison of with versus without.
POWER CONNECTOR- A wonderful, removable connector
that allows you to hook up all the power wires in the convenience
of daylight and then plug them into the 24XS in the dark recesses
of your trunk.
The Inside
PROGRAMMABLE CROSSOVER MODULE-
This 16 pin resistor module controls the crossover frequency. It
is set from the factory at 90Hz. Different modules may be
obtained from your dealer or custom built yourself. See the section
on Making Your Own Modules for instructions. Note: The 24dB
crossover module is different than the 18dB PFM frequency
module.
PROGRAMMABLE FREQUENCY MATCH (PFM)
FILTER MODULE-
This 14 pin Module controls the cutoff frequency for the PFM
Filter. The PFM is the bottom limit for the low pass output. It is
set from the factory at 33 Hz.
SPEAKER WAVE ALIGNMENT SELECTOR SWITCHES-
This pair of switches select whether the SWAT control moves
the nulls in your speaker response towards the outputs on the high
pass side or the outputs on the lowpass side. NOTE: Both of these
switches MUST be in the same position (i.e. both in Hi or both in
Low)
GROUND ISOLATION SELECTOR-Allows the installer to
change the power supply ground isolation for different systems.
This is shipped in the fully isolated position from the factory. The
other selections can help if you have a ground loop noise in the
system that doesn’t seem to want to go away.
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