Audio Control LC6i User manual

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tmLC6 tm
Six Channel Line Output Converter
For interfacing with factory installed audio systems
Greetings from the rainforests of the Pacific Northwest. We would like to congratulate you on your purchase of the LC6i; a six-chan-
nel, high-performance, line-output converter. This unique product will
accept two, four, or six channels of speaker-level signal from a factory-
installed amplifier or source unit and convert it to a high-quality, low-
noise pre-amp signal. Therefore the LC6i is an ideal OEM (Original
Equipment Manufacturer) interface component as it will allow you to use
your factory-installed source unit but give you the ability to add really
good aftermarket amplifier(s) and processor(s). Whether this is your first
product from the rainforest dwellers of AudioControl, or you are already
a firm believer, you will definitely enjoy how great the LC6i can make
your performance system sound.
Now before you start salivating just thinking about the benefits and all
of the nifty applications for your LC6i, take a few minutes to sit back,
have a cold beverage, and read through this manual. We always love to
get calls from our customers, but have tried to answer all of your ques-
tions in this manual so it contains lots of useful facts and information
- - and besides, we spent a lot of time writing it!
Key Features of The LC6i
Here are some of the cool features that your LC6i offers:
• Six input and output channels
• Speaker-level inputs – can accept 400-watt signals!
• Internal channel summing
• GTO™ - signal-sensing inputs
• Level matching controls
• 12 volt trigger output
• Input for optional subwoofer level control
• Cardboard box for easy storage
TMmaking good sound betterTM
22410 70th Avenue West • Mountlake Terrace, WA 98043
Phone [phone] • Fax [phone] • www.audiocontrol.com
®

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Features and Highlights
Speaker-Level Inputs
If you are like many people who enjoy the look and features of your
factory-installed source unit but feel your system overall is lacking pow-
er and bass, we have good news. The LC6i has high-impedance speaker-
level inputs that allow it to accept amplified signals from all known fac-
tory-installed source units (even Bose) and output a high-quality pre-amp
signal via standard RCA connectors. This will allow you to add
better-quality aftermarket amplifiers, processors and speakers while
keeping the convenience features of your factory-installed source unit.
Unlike inexpensive speaker-level and line-output converters, the LC6i
offers the highest sound quality and can handle the full signal strength of
a 400-watt amplifier.
GTO™ Signal-Sensing Inputs
Most factory-installed source units lack the features that make it easy
to upgrade with really good-sounding, performance aftermarket products.
One of those key features is a 12-volt trigger that will turn on devices
like the LC6i and your external amplifiers. Therefore, we have equipped
your LC6i with our unique GTO™ (Great Turn On) signal-sensing in-
puts. Once the GTO input of your LC6i detects a speaker-level signal on
the Main Inputs, it powers up. When the speaker-level signal goes away,
your LC6i will automatically turn-off. Optionally, your LC6i is also
equipped with a standard 12-volt trigger (Remote In) that will allow you
to turn on your LC6i in the traditional manner.
12-Volt Output Trigger
Since you will be using an external amplifier(s) and processor in your
system, you will need the ability to “trigger” or turn-on these devices (a
romantic dinner won’t quite work here). Your LC6i has a high-current
12-volt output (labeled Remote Out) that will provide a trigger to these
remote devices, when the LC6i is powered up. Please note that this out-
put is not to be used as the main power for these devices.
Internal Channel Summing
The LC6i has the unique ability to internally sum together multiple (4
or 6) input channels from the factory source unit into 2 channels. This
is particularly handy when using the LC6i with a factory system that has
multiple, actively crossed-over signals being sent from the OEM source
unit or amplifier(s). For example, in some vehicles there is an actively
crossed-over tweeter, midrange, and woofer all in the front of the ve-
hicle. The LC6i lets you take all of those signals and sum them together
to get a high-quality, full-range, pre-amp signal without the use of any
additional cables or hardware.

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AutoMode Inputs
Sometimes in life (and car audio) we need more outputs than inputs.
Therefore we have equipped your LC6i with AutoMode inputs that take
the Channel 2 signal and automatically feeds it to the Channel 3 outputs,
provided there is no signal present on the Channel 3 inputs. This means
your LC6i will accept two input channels and give you four output
channels. Or it can accept four input channels and give you six output
channels.
Output Level Controls
Your LC6i has level controls for each pair of channels. These controls
allow you to adjust the signal level from your factory-installed amplifier
or source unit to match up with your aftermarket amplifier or processor.
Input For Optional Subwoofer Level Control
With the addition of high performance, aftermarket amplifier(s) and
speakers, you may feel the need to have more control over your system.
The Remote Subwoofer Level Control (sold separately along with un-
dercoating) allows you to add a dash-mounted control to your LC6i that
will adjust the level of the Channel 3 output, often used for the subwoof-
er. This output is full range so it may need to be crossed over depending
upon your application.
Bulletproof Warranty
The most important feature of all. Every
AudioControl product is selflessly de-
signed and manufactured in our factory
located in the rainforests of the Pacific
Northwest. We take every effort to ensure that you will have
many years of enjoyment out of your LC6i. To ensure optimal
performance we highly recommend that you allow your authorized
AudioControl dealer to perform the installation. Not only do they have
all the right knowledge and tools, but also in the unlikely chance your
LC6i should stop working, we will back it with a limited five years parts
and labor warranty. Should you choose to install it yourself we will still
give you a one-year parts and labor warranty. To activate your warranty,
you need to FILL OUT AND SEND IN YOUR WARRANTY CARD!
We also recommend that you save your invoice or sales slip as proof
of installation and ownership. Not only is it necessary for warranty
purposes, but should your LC6i “walk away” one day while your car is
parked at your local latte’ stand, you will find insurance companies very
unforgiving without proof of purchase.

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Quick Installation Information
For those of you short on time but high on ambition, we offer the fol-
lowing section to speed up your installation of the LC6i:
1. Physically mount the LC6i in a location that keeps it away from
soda spills, food crumbs, and curious fingers. You will want to select a
location that allows you access to the level controls. In many cases you
can find factory speaker leads in the rear of the vehicle that are easy to
access.
2. The LC6i needs to be installed in the signal path between your OEM
source unit or factory-installed amplifier(s) and an aftermarket external
amplifier and/or processor(s). Locate the speaker wires that are coming
from your factory source unit and/or amplifier and connect them to the
speaker-level inputs on your LC6i.
3. Connect the Output RCA connectors to cables that run to your after-
market external signal processors and/or amplifiers. If this is not obvious
to you, quickly pack up your LC6i and run to your nearest authorized
AudioControl dealer to have them perform the installation. You will
thank us later.
4. Connect +12 power, ground, and remote turn-on (if applicable).
5. Level match your LC6i to your source and amplifiers.
Note: You will want to turn the gains DOWN on your aftermarket am-
plifiers to maximize your systems performance and minimize any HISS.
Figure 1: Basic LC6i System
If you need to know more, then read on. Heck, if you don’t need to
know more, still read on, because you can never know too much and as
much as we would like to get your calls and e-mails, most of the answers
to your questions are in this manual!

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A Guided Tour of the LC6i
¬ Speaker-level Inputs: The LC6i has three sets of speaker-level in-
puts. These inputs get their signals from the speaker-level outputs of your
factory-installed source unit or amplifier (if your vehicle is so equipped).
If your source unit has front, rear, and subwoofer speaker-level outputs,
connect them to the three sets of inputs on your LC6i. If the source unit
only has front and rear inputs, the Auto Mode circuitry in your LC6i
automatically routes the Channel 2 input channels to the Channel 3.
② Ground: Connect to a good, verified chassis ground (the battery
comes to mind.) Warning: Factory ground wires typically already have
multiple devices connected to them and are not recommended.
® +12 Volt: Connect to a good source of power (the battery comes to
mind again)
¯ Remote In: Allows your LC6i to be turned on remotely with a 12-
volt signal.
° Remote Out: Outputs 12 volts when the LC6i is powered up so you
can turn on external devices like signal processors and external amplifi-
ers. DO NOT USE FOR SYSTEM POWER!!
± Maximized Indicator: This brightly colored LED indicates when
your signal level is just below clipping your LC6i. When properly level
matched, this LED should flicker occasionally when your system is play-
ing at its maximum volume level.
² Power: If you have connected all of your power wires correctly,
this light should be bright red when your system turns on.
³ Remote Subwoofer Level Control Input: This input allows you to
add an optional (sold-separately-not-included) remote that will allow you
to control the subwoofer output of your LC6i from your dashboard.
´ Pre-Amp Outputs: These RCA connectors should be connected to
the next component after the LC6i, such as a signal processor, crossover
or amplifier. Do not connect any speakers directly to your LC6i. (Defi-
nitely don’t connect to any home appliances, like your microwave.)
µ Level Controls: These knobs allow you to adjust the signal level
from your source unit to match that of your aftermarket amplifiers. Be-
cause they are amplified, most factory-installed source units have rela-
tively high signal voltage output, which will require you to decrease the
signal level.
Channel Summed Indicators: Under the cover of your LC6i are
jumpers that will allow you to sum selected channels into the main chan-
nels. This is especially useful for factory-installed systems with actively
crossed-over speaker systems. These indicator LED’s let you know
which channels are being summed into the main inputs.

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Under the Covers
Output Summing Jumpers: These jumpers allow you to select which
input signals will be summed into the Main outputs. When the jumper
is in the Summed position, there will also be a corresponding green
indicator light on the front of the LC6i. The shipped-from-the-factory
setting is in the separate position.
Ground Isolation Selector: Occa-
sionally alternator noise may appear in
a system because the source unit and
amplifier are using different grounding
schemes. To help in this situation, we
have provided alternative grounding
connections. Make sure your system
is turned OFF before you move these
jumpers.
Figure 3: Inside view of LC6i
Figure 2: LC6i top cover
¬② ®¯°±
²³
´
µ

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Factory Settings – Internal Jumpers
Shipped Options
Ground isolation Isolated
(but not lonely)
200 ohm or Ground
Summing Jumpers Separate Summed
Weather Rainy Overcast
LC6i Block Diagram
Installing Your LC6i
By this time we are sure that you are chomping at the bit to install your
LC6i. Up to this point, everything you have read has served to educate
you on the operations of LC6i. Therefore if you are still with us we
recommend you read the following sections very carefully.

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Placement & Mounting of the LC6i
Your LC6i can be physically installed in numerous locations like
behind your dashboard, under a seat, or even in the trunk. Since you
will be connecting to the speaker wires from the factory source unit or its
amplifier(s), you should select a location that is convenient for wiring.
Once you have selected a permanent mounting location, position the unit
and mark the appropriate mounting holes with a felt-tip pin or scratch
awl. Before doing anything else, make sure you are not about to drill
a hole in a gas tank or pierce any existing wiring. Nothing ruins your
day more than an expensive repair bill. Drill a few small pilot holes and
secure the chassis of the LC6i with self-tapping screws.
LC6i Power Wiring
WARNING: Failure to disconnect the negative terminal of your battery
prior to the installation of your LC6i can result in a warm tingly feeling.
(+12V) Positive Connection: Insert a 12 to18 gauge wire into the con-
nector labeled “+12” on the nifty connector of your LC6i. Connect it to a
good constant source of 12 volts (we suggest the battery), fused at 1 amp.
Ground Connection: Use the same gauge wire as you did for the
positive connector and run it from the “Ground” connector on your LC6i
to the negative terminal of the battery, a ground bus, or a verified ground
location. The factory head unit ground is not a good ground!
Remote In: Connect a 22 to 18 gauge wire from the source unit’s
remote turn-on or other trigger to the Remote connector on the LC6i. As
we previously mentioned, your LC6i is equipped with GTO signal sens-
ing which allows it turn on when it detects a signal at the Main speaker-
level inputs so you may not need to use the “Remote In” feature.
Remote Out: If you are going to use the LC6i to turn on any external
signal processors or amplifiers, connect an 18 to 22 gauge wire from the
Remote Out on the LC6i to the remote turn-on of the processors or am-
plifiers. Depending upon how many you are turning on, you may need to
connect this wire to a relay and route 12 volts from another source.
Once the electrical connections are complete, you will want to re-
connect the negative terminal to your battery, however continue to act
positively.
LC6i Audio Wiring
The LC6i needs to be installed in the signal path after your factory
source unit or amplifier but definitely before your aftermarket amplifiers
and/or any signal processors. You may already have guessed there are
numerous ways to configure the LC6i in your audio system so we recom-
mend you spend a little quality time planning out your system and even
sketching it out on paper.

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Interfacing with factory-installed radio
Figure 5: LC6i system using summing functions – 2-way front plus subwoofer
Figure 6: Six channel system with LC6i and EQS
Speaker-Level Inputs
The LC6i is designed to accept an amplified, speaker-level signal from
a factory source unit or amplifier. You will want to refer to a factory
service manual or wiring-harness schematic to determine which wires
are the speaker wires for your system. If you are unsure which wires
are the speaker wires, it is recommended you look at the color of the
speaker wire connected to the speakers and follow them back to the fac-
tory source or amplifier. Connect the speaker wires to the Speaker-Level
Inputs on your LC6i. Make sure to get your “pluses” and “minuses”
connected properly.

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Pre-Amp Outputs
Connect good quality RCA connectors from these outputs to the inputs
of your amplifiers. While we won’t get into the discussion as to whether
plutonium cables sound better than un-obtainium cables we will tell you
that well-constructed cables are less problematic in rugged environment
like your car system.
Summing The Outputs
Under the cover are connection jumpers that allow the Main outputs
of the LC6i to receive signals from the inputs of Channel pairs 2 and 3.
These jumpers allow you to select which input signals will be summed
into the Main output. When one of the jumpers is in the Summed posi-
tion, the corresponding green indicator light on the front of the LC6i
will be lighted. The shipped-from-the-factory setting is in the Separate
position.
When you have summed several channels together, you will want to
make sure the output levels are providing a balanced frequency response.
A simple technique involves using a pink noise cd and a real time audio
analyzer (AudioControl happens to make a great one!)
1) Perform all of the steps necessary to install your LC6i.
2) Connect the Main Outputs from your LC6i to the audio input on
your real time analyzer. “Yes”, your amplifiers will be disconnected from
the LC6i at this time.
3) Start playing pink noise on your cd player and raise the volume level
until signal is displayed on your real time audio analyzer (RTA).
4) Adjust the LC6i input level controls for each pair of channels until
your RTA is displaying a smooth or flat response curve.
5) If you wish to make any additional frequency response adjustments
you may want consider adding an equalizer to your system (we happen to
know someone who makes some really good ones - www.audiocontrol.
com).
Figure 7: Using an RTA to measure the Summed Response

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Level Matching
If you have ever listened to a friend’s “killer” car audio system and
heard lots of hiss, clicks or pops, then you may have experienced an im-
properly level-matched system. When a performance autosound system
is properly level matched, you should get the maximum output from your
source unit and amplifiers without any clipping or that annoying hiss!
The following steps will help you through the process, although at the
end of the day, your ears will be your guides!
1. Set your source unit’s fader and balance controls to their center posi-
tions. If your source unit has subwoofer output (and you are using it), set
the output level at minimum.
2. Disconnect the RCA cables between your LC6i and the amplifier(s).
Otherwise get some earplugs.
3. Start playing some dynamic music and set the volume on your
source unit to about 3/4 of maximum. You should not be hearing any-
thing at this point as the amplifiers are unplugged. If you are hearing
music, go back to step #2; if you are hearing voices go see a doctor!
4. Adjust the output level controls until the “Maximized” light starts
to flicker. If the Maximized LED does not come on but you are hearing
music, fear not. The signal level from your source unit is probably not
sufficient enough to trigger the LED. Do not worry, proceed on.
5. Set the input gains on the amplifier(s) at minimum! This is known
as turning down your gains.
6. Double check that you performed Step #5!
7. Decrease the volume control on your source unit and re-connect the
RCA’s between the LC6i and the external amplifier(s).
8. Now increase the volume on your source unit to your normal listen-
ing level. For some of you, this may be louder than others!
9. At this point you may find yourself going back and adjusting the
Output Level controls on your LC6i to balance the front, rear, and sub-
woofer sections of your system to accommodate speaker placement and
efficiency. Speakers on the rear deck of your car will probably sound
louder that the ones in your doors!
Dash Control (available separately)
Placement And Mounting
The dash control may be mounted under the dash using its own bracket
or through a custom hole in the dash. It should be within reach of the
driver and in a spot where the LED is plainly visible.

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Figure 8: Dash Control Assembly
Dash Bracket Installation
The dash control mounts with two screws, which attach
to the underside of the dashboard. Slide under the
dash and place the dash control in its mount-
ing position, mark the two mounting holes,
drill pilot holes, and secure with two
screws.
Custom Installation
For that custom, finished look,
the dash control can be flush
mounted directly on the dash-
board (or anywhere else). We have
provided an extra label to help make this happen. Referencing Figure 8,
disassemble the dash control from the mounting bracket. Start by push-
ing the LED from its holder followed by removing the circuit board and
rotary control from the bracket. Drill a 9/32 hole in the dashboard for
the control along with a 1/8 hole for the lock tab and a 13/64 hole for the
LED holder. Reassemble the dash control components on the dashboard
and apply the new label over the openings
Dual-Color Dash Control LED
The LED on your dash control is rainforest green and should brighten
or dim when you turn the knob. Should you wish to change the color to
amber, remove the plug connected to the LED and turn it 180 degrees
and plug it back in.
Troubleshooting
It is important to remember when installing your LC6i that the engi-
neers who work for the car manufacturers don’t spend too much time
thinking about interfacing after market products. Therefore you will
most likely have to “modify” your traditional wiring and installation
techniques when working with these types of systems. Many times tradi-
tional 12 volt “turn-on” wires or pre-amp audio signals that you are used
to with aftermarket systems don’t exist on these newer vehicles.
No Power: If the Power LED on your LC6i will not turn on, check to
make sure that the power wire and remote turn-on wires are connected or
a fuse has not blown, and that your factory headunit is on!
LC6i Turns Off Intermittently: If you are using the GTO signal sens-
ing to turn on your LC6i yet your system is turning off, this may be due
to a cellular phone interface or navigation system built in to your factory
installed source unit. These are known to route the audio signal away
from your source unit’s outputs. In these situations it is recommended
that you connect a 12-volt trigger wire from the Remote In on the LC6i.

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Sounds Distorted: Should your system sound distorted or your speak-
ers are moving way too much, you should make sure you have your lev-
els matched properly and that your amplifier gains are set at minimum.
System Hiss: Check to make sure that your amplifier gains are set at
the minimum level.
Turn-On Pop or Turn-Off Pop: This generally occurs when your
amplifiers are turning on or off at a different time than your LC6i. There-
fore it is recommended that you use the “Remote Out” on your LC6i to
turn your amplifiers on or off and eliminate any timing issues.
Low Output: Depending on the design of your factory-installed
system, you may actually be connecting to a pre-amp signal instead of a
speaker-level signal. Since the LC6i is a line output converter you may
need to turn up the gains on the LC6i or consider adding a pre-amp line
driver like the AudioControl Matrix to increase the signal level to your
aftermarket amplifiers.
Maximized LED Does Not Light Up: If this LED does not come on
but your music sounds fine, don’t panic! Normal operation for this LED
is for it to only flicker at higher levels and remain OFF at lower levels.
It is only there to indicate when the pre-amp signal level in your LC6i is
approaching the maximum level (a.k.a. “clipping”.) If it comes on…and
stays on even without music, then you can panic.
IF YOU LIKE LC6i, YOU’LL LOVE…
The EQS six-channel
equalizer, is the perfect
trunk mount processor for
those of you who want to
improve the sound and
detail of your vehicle. Less
than ideal factory speaker
locations can make even the best speaker systems cry out for help. The
equalization controls on the EQS provide you with an ideal amount of tone
control to tame even the most challenging acoustical situations.
If you want to add the ultimate in system equalization and are ready to
step into the digital domain, then the AudioControl DQS six-channel digital
equalizer with memories is
just for you. The DQS of-
fers six channels of equal-
ization with 30 bands of
precise control per channel,
for a total of 180 filters.

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If you need a crossover for
your system that keeps up
with your LC6i, the 6XS is a
6-channel, 2-way crossover
with breath takingly steep
24dB-per-octave slopes. If
performance is important to
you, then you will appreci-
ate the 6XS. Of course if you
are just looking for deeper,
chest-thumping bass, then The
Epicenter our patented (U.S.
patent # 4,698,842) bass restoration processor is just the hot ticket. It puts
the woof back in your woofers!
And now a word from the legal department...
THE WARRANTY
People are scared of warranties. Lots of fine print. Months of waiting
around. Well, fear no more, this warranty is designed to make you rave
about us to your friends. It’s a warranty that looks out for you and helps
you resist the temptation to have your friend, ...who’s “good with elec-
tronics”, try to repair your AudioControl product. So go ahead, read this
warranty, and then take a few days to enjoy your LC6i before sending in
the warranty card and comments.
“Conditional” doesn’t mean anything ominous. The Federal Trade
Commission tells all manufacturers to use the term to indicate that cer-
tain conditions have to be met before they’ll honor the warranty. If you
meet all of these conditions, we will warrant all materials and workman-
ship on your LC6i for one year from the date you bought it (five years if
it is installed by an authorized United States AudioControl dealer). We
will fix or replace it, at our option, during that time.
Here are the conditional conditions:
1. You have to fill out the warranty card and send it to us within 15
days after purchasing your LC6i.
2. You must keep your sales receipt for proof of purchase, showing
when and from whom the unit was bought. We’re not the only ones who
require this, so it’s a good habit to get into with any major purchase.
3. Your LC6i must have originally been purchased from an authorized
AudioControl dealer. You do not have to be the original owner, but you
do need a copy of the original sales slip.
4. You cannot let anybody who isn’t (A) the AudioControl factory; (B)
somebody authorized in writing by AudioControl to service your LC6i.

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If anyone other than (A) or (B) messes with your LC6i, that voids your
warranty.
5. The warranty is also void if the serial number is altered or removed,
or if LC6i has been used improperly. Now these sound like big loop-
holes, but here is all we mean by it.
Unwarranted abuse is (A) physical damage (don’t use the LC6i for a
jack stand); (B) improper connections (120 volts into the power jack can
fry the poor thing); (C) sadistic things. This is the best mobile product
we know how to build, but if you mount it to the front bumper of your
car, something will go wrong.
6. If an authorized United States AudioControl dealer installs your
LC6i, the warranty is five years, otherwise the warranty is one year.
Assuming you conform to 1 through 6, and it really isn’t all that hard
to do, we get the option of fixing your old unit or replacing it with a new
one.
LEGALESE SECTION
This is the only warranty given by AudioControl. This warranty gives
you specific legal rights that vary from state to state. Promises of how
well the LC6i will perform are not implied by this warranty. Other than
what we have covered in this warranty, we have no obligation, express or
implied. Also, we will not be obligated for direct or indirect consequen-
tial damage to your system caused by hooking up the LC6i.
Failure to send in a properly completed warranty card negates any
service claims.
LC6i SPECIFICATIONS
All specifications are measured at 14.4 VDC (standard automotive voltage). As tech-
nology advances, AudioControl reserves the right to continuously change our specifica-
tions, like our Pacific Northwest weather although we are working on changing that.
Maximum speaker-level input ...............................400 watts @ 4 ohms
Maximum output level ............................................................... 9.5Vrms
Output gain ............................................................................... +/-12 dB
Frequency response ............................................................ 10Hz-22kHz
Total harmonic distortion .............................................................. 0.01%
Input Impedance ..................................................................... 20 Kohms
Power supply .......................................High headroom PWM switching
Power draw ..................................................................................200mA
Recommended fuse rating ............................................................1 Amp
Size ....................................................................... 8” W x 6” D x 1.2” H
Weight ........................................................................................... 3.5 lbs
Remote Trigger Ouput Current .....................................................1 Amp

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™making good sound better™
22410 70th Avenue West
Mountlake Terrace, WA 98043 USA
Phone [phone] • Fax [phone]
www.audiocontrol.com
®
P/N 913-084-0
©2006 AudioControl, a division of Electronic Engineering and Manufacturing, Inc. All rights reserved
AudioControl, Making Good Sound Better, LC6i, The Epicenter, EQS, 6XS, GTO and AutoMode
are all trademarks of Electronic Engineering and Manufacturing, Inc.
This manual was conceived, designed, and written while on a road through the Pacific Northwest
on a spectacularly rare, sunny, and cloudless day. Country music was playing on the radio and the
kids were watching Shrek II.