ATS003935_TSD-ALC2_Owners_Manual
Owner’s Manual
TSD-ALC2
Audio Level Controller/Limiter
TSD-ALC2
Audio Level Controller/Limiter
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
–1–
Specifications are subject to change without notice.
AtlasSound.com
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Description
The Atlas Sound TSD-ALC2 is an automatic 2-channel audio level controller/limiter that allows
designers and installers the ability to set predetermined maximum source levels. The TSD-ALC2 is
great for installations with multiple program sources including satellite receivers, mp3 players, etc.
that typically have vast output level irregularities. With the TSD-ALC2 inserted in line with these
sources, the audience will not be distracted during high volume commercial breaks or when different
inputs are selected. Retail stores, restaurants, sports bars, hotels, event centers, and other facilities
can all benefit from improved sound when the TSD-ALC2 is integrated.
Features include stereo RCA input and output connectors, threshold level, ramp speed selection,
and output gain adjustments. The TSD- ALC2 also works well when used in conjunction with Atlas
Strategy Series Mixer Amplifiers. For level control and passive combining of stereo sources with
Atlas amps, specify (1) AA-YSUM input cable in conjunction with (1) TSD-ALC2 for each source input.
The TSD-ALC2 is highly efficient and meets most energy standards as one 24V DC power supply
(available separately) can power multiple Atlas Time Saving Devices.
The TSD-ALC2 is part of a full line of Atlas Sound Time Saving Devices. These compact
(1.5" x 4" x 2.75") units are designed to solve some of the common audio system problems in the
easiest and in the most efficient and cost-effective way. All models are made from high quality
components and include removable individual I/O connectors for quick and precise wiring, separate
ground terminals for all I/Os assuring secured connections, and removable level controls that can be
replaced with tamper-proof security covers.
Features
Audio Applications
• Stereo Auto Level Control
• Unbalanced RCA Input and Output
• Threshold Level Adjustment
• Ramp Speed Selection
• Output Gain Control
• Security Covers Included for All Front
Panel Controls
• Meets Most Energy Standards
• Compact Chassis Design
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Satellite Feeds
iPod®
CD Players
MP3 Players
Installation
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Restaurants
Sports Bars
Schools
Residential
Playback Systems
House of Worship
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com
–2–
Specifications are subject to change without notice.
Owner’s Manual
TSD-ALC2
Audio Level Controller/Limiter
Understanding an Audio Auto Leveler
Variable audio levels between songs or TV programs and commercials can be very aggravating
in a home or commercial environment. Because the audio content varies drastically, Auto Level
Controllers (ALCs) require unique settings to maximize the audio auto level performance for the
specific application. Most Audio Auto levelers on the market claim to seamless transition between
sources or material, however no ALC can perfectly auto-level audio. No ALC has perfect seamless
audio auto leveling. In fact, many bad designs that utilize old technologies or are incorrectly used
have given ALCs a bad name. The TSD-ALC2 is designed with the latest technology and optimizes
adjustments and settings for each unique installation.
Determining a signal’s sample rate is important for an ALC to detect when the source material audio
level is actually changing or if it is just dynamic changes within the song. A fast reaction time is
necessary to quickly adjust the level but if it is set too fast, an audible pumping effect will occur when
music content with a lot of drums goes to a piano, for example. Too slow of a reaction time can also
be annoying during transitions between tracks or to commercial breaks. Another issue ALCs must
overcome is the level of variation between input signals. If it is too large, the compensation creates
an abrupt level change that is noticeable to the listener. If the level adjustment is too small, the song
or commercial can be well into its content before the level adjustment occurs. Either way, the overall
listening experience is disrupted.
The TSD-ALC2 solves these signal level issues without the need to of a computer and measurement
tools to tailor the settings to the job. The TSD-ALC2 uses 42 audio samples per measurement,
averages out the signal levels, and makes an adjustment every 20 milliseconds if required. This has
been determined as the ideal sample rate to detect the audio dynamic content and make adjustments
in most applications. The TSD-ALC2 also allows you to select how much the level can be adjusted,
at either 1dB or 2dB increments. The TSD-ALC2 also incorporates an adjustable hard limiter so the
maximum level in an audio system cannot be overdriven. The Output Level Limiter can be adjusted
from 100mv to 1.5V.
The TSD-ALC2 provides a smooth transition between music or audio source selections. Auto level
changes depend on how drastic the level needs to be adjusted but, in most situations, auto leveling
isn’t noticeable and will greatly improve the listening experience. Secondly, the output limiter feature
prevents users from turning up the gain too loud and damaging your speakers - an invaluable feature
that alone makes the TSD-ALC2 worth adding to any system.
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
–3–
Specifications are subject to change without notice.
AtlasSound.com
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Front Panel Description
7
7
6
5
4
3
7
7
1
2
1. Input Level Attenuator - Adjusts the level of the input signal applied to the ALC2. This only
reduces the input signal and does not add signal gain. See the Setting the Level section on page 7.
Turn counter-clockwise to decrease the signal. Note: The Input Level Control knob can be removed and replaced with a supplied security cover to prevent unauthorized adjustment.
2. Output Level Limiter - Sets the maximum output signal that will be available at the outputs. Turn clockwise to increase the signal level and counter-clockwise to decrease it. Note: The Output
Level Control knob can be removed and replaced with a supplied security cover to prevent unauthorized adjustment.
3. Power LED - Illuminates Blue when 24VDC power is present.
4. Signal LED - Illuminates Green when the input signal strength reaches 25mV to verify a signal path.
5. Input Peak LED - Illuminates Red when the input signal reaches 3dBV below when signal clipping
will occur. Occasional flashing is normal but if this indicator is continuously On, then reduce the input level using the Input Level Attenuator.
6. ALC Active LED - Illuminates Yellow when circuitry is working. Note: If this LED is not
illuminated or flashing, the Auto Level Control circuitry is not functioning and either the output signal at the source or the input level control on the ALC2 must be increased. This LED
will not illuminate until the input level is 100mV.
7. Bracket Retainer Points - Each TSD includes two mounting brackets for securing the TSD to a
cabinet or wall. Remove screws and align the bracket with the panel hole before firmly tightening the screws.
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com
–4–
Specifications are subject to change without notice.
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Rear Panel Description
5
5
4
5
5
1
2
3
The TSD-ALC2 features Stereo RCA inputs and outputs and a removable phoenix style power
connector that has a 3.5mm pitch between pins.
1. DC Power Input - Each TSD that requires DC power comes with a 2 position connector for an external 24VDC power supply (sold separately). Because of the TSDs low power consumption, a single external power supply may power more than one TSD. Please refer to the specifications on current requirements in milliamps to match with the appropriate power supply. Note: It is
acceptable to exceed the current requirements of the TSDs but NOT safe to use a power supply that is below the current requirement of the device.
2. RCA Input - Connect unbalanced line level sources to these inputs. The source connections
must be mated properly to the input connector or signal loss and/or noise may be introduced.
3. RCA Output - Connect these unbalanced line level outputs to amplifiers or other devices. The output connections must be connected properly to the connectors or signal loss and/or noise may be introduced to other devices.
4. Ramp Speed Switch - Select the audio level rate of change to fit your Ramp Speed. This switch selects between 1dB (slow) or 2dB (fast) change in level per transition step.
5. Cable Management Retainer Points - Use the rear panel screws for connecting the included cable retainers. Each TSD comes with two cable retainers for simplified cable management.
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
–5–
Specifications are subject to change without notice.
AtlasSound.com
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Knob and Security Cover
All front panel level controls feature a removable knob that can be replaced with included security
covers to prevent potentiometer damage or unwanted changes.
• Knob Installation - Turn the potentiometer shaft fully counter-clockwise. Align the knob indicator to the lowest setting on the panel and the potentiometer shaft slot. Carefully press the knob onto
the potentiometer shaft. Do not force or damage may occur to the potentiometer.
• Security Cover Installation - Remove the knob from the panel and insert the cover. Do not force or
damage may occur to the potentiometer. Small pliers may be required to remove the knobs.
Mounting
There are three ways to securely mount this TSD:
1.Velcro™ - Each unit includes industrial-grade Velcro™ with adhesive backing to adhere to any
flat surface.
2. Brackets - Each unit includes two mounting brackets to secure to a cabinet or wall.
3. Rack Mount Panel - The optional TSD-RMK rack mount panel supports up to four TSDs in a
1RU space.
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com
–6–
Specifications are subject to change without notice.
Owner’s Manual
TSD-ALC2
Audio Level Controller/Limiter
Setting the Level
For optimization of the ALC2, it is important to understand that the set level should be the balance of
input source signals from low input signal to strong input signal. The Auto Level Control circuit
operates from a wide 50mV to 3V range of input voltages to accommodate iPods, CD players,
computers, and satellite receivers with immense dynamic variation of music and commercial content.
Follow these steps to calibrate the ALC to achieve optimal performance and review the
Understanding an Audio Auto Leveler section on page 3.
1. Insert the ALC2 in line between audio source and the preamp or amplifier. Note: Turn the level controls on the amplifier to minimum or Off position.
2. Turn the Level Attenuator and the Output Level Limiter fully clockwise to Max positions.
3. Strong Input Signal Setup- If using a preamp or input source selector with more than one input source, setup the source with the loudest audio content and strongest signal first. Increase the input signal until the Signal LED is flashing and the Active LED is flashing steadily on the ALC. Once
the Peak LED begins to flash, reduce the input signal until it stops. The Auto Level Control circuitry works best if the strongest input signal is just below the Peak threshold.
4. Low or Weak Signal Setup - After setting up the strongest input, select the content with the lowest input signal and check if the Active Limiter LED is flashing. If not, increase the input signal at the source or by using the Level Attenuator until the LED is flashing. The level setting is a balance between the strongest and weakest input signals.
5. Finally, set the output level to the amplifier. Choose a dynamic signal source for this set up and slowly increase the amplifier level control to the level desired in the audio system. If the level is too strong from the ALC2, turn the Output Level Limiter counter-clockwise to the level desired to match your amplifier gain and system listening level. Check the amplifier’s Input Sensitivity specification and match the Output Limiter Level to it. For example, if the amplifier Input Sensitivity is 1V, the Output Limiter Level should be set at or below 1V to prevent clipping. Use the markings indicating the maximum output voltages on the Output Limiter Control to set your level so the maximum audio system level is fixed or limited.
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
–7–
Specifications are subject to change without notice.
AtlasSound.com
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Block Diagram
AGC OUTPUT
LEVEL +4dBV
R
R
OUTPUT LEVEL
INPUT LEVEL
INPUT
ATTENUATION
INPUT SIGNAL
CTRL
INPUT PEAK LED
+4dBV to -∞
+1.5V to 0V
AGC OUTPUT
LEVEL +4dBV
L
RCA
L
INPUT
ATTENUATION
20V to PREAMP
ANALOG
POSITIVE REGULATORS
FILTER, ANTI-JAMMING
5V to CTRL
DIGITAL
POSITIVE REGULATORS
FILTER, ANTI-JAMMING
DC 24V
POWER SHOW
LED
Specifications
Description
Two Channel Audio Level Controller/Limiter
Chassis Color
Chassis Material
Black
Aluminum
Inputs
Type
Connection
Impedance
Qty 2, Unbalanced
RCA Left and Right
10KΩ
Outputs
Type
Qty 2, Unbalanced
Connection
RCA Left and Right
Impedance150Ω Unbalanced
Output Level
Adjustable from 0V to 1.5V, Hard Limit
Controls
Input Level Attenuator
Output Level Limiter
Qty 1, Removable Knob with Security Cover
Qty 1, Removable Knob with Security Cover
Indicators
Input Signal
Input Peak
ALC Active
Power
Green, 25mV On Threshold
Red, -3dB Before Clip
Yellow, Onset of Input Level Reduction, 2.6V Threshold
Blue
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com
–8–
Specifications are subject to change without notice.
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Electrical
Frequency Response
Auto Level Threshold Range
THD
Signal to Noise
Output Level Limiter Range
Sample Rate
Delay Time
Level Adjustment Increment
20Hz - 20kHz (±1dB)
25mV - 3V
.5% @ 1kHz
80dBV
0V - 1.5V
42 per Adjustment
20ms Between Adjustment
1dB or 2dB Selectable
Mounting
Velcro™
Brackets
TSD-RMK
Cable Retainer
Industrial-Grade, Included
Qty 2, Included
Optional 1 RU Rack Mount Panel (Supports 4 TSD Units)
Qty 2, Included
Power Requirements
Voltage24VDC
Power Consumption 60mA
Power Consumption 1.4W
Dimensions
H 1.5" (39mm) x W 4" (101mm) x D 2.75" (70mm)
Weight
6oz, .165kg
Accessories
TSD 24VDC Power Supplies
TSD-RMK 1 RU Rack Panel
Safety and Certifications
External Power Supply
cUL, CE, RoHS, TUV
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
–9–
Specifications are subject to change without notice.
AtlasSound.com
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Notes:
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com
– 10 –
Specifications are subject to change without notice.
Owner’s Manual
TSD-ALC2
Audio Level Controller/Limiter
Notes:
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
– 11 –
Specifications are subject to change without notice.
AtlasSound.com
TSD-ALC2
Audio Level Controller/Limiter
Owner’s Manual
Limited Warranty
All products manufactured by Atlas Sound are warranted to the original dealer/installer, industrial or
commercial purchaser to be free from defects in material and workmanship and to be in compliance
with our published specifications, if any. This warranty shall extend from the date of purchase for
a period of three years on all Atlas Sound products, including SOUNDOLIER brand, and ATLAS
SOUND brand products except as follows: one year on electronics and control systems; one year on
replacement parts; and one year on Musician Series stands and related accessories. Additionally,
fuses and lamps carry no warranty. Atlas Sound will solely at its discretion, replace at no charge or
repair free of charge defective parts or products when the product has been applied and used in
accordance with our published operation and installation instructions. We will not be responsible
for defects caused by improper storage, misuse (including failure to provide reasonable and
necessary maintenance), accident, abnormal atmospheres, water immersion, lightning discharge,
or malfunctions when products have been modified or operated in excess of rated power, altered,
serviced or installed in other than a workman like manner. The original sales invoice should be
retained as evidence of purchase under the terms of this warranty. All warranty returns must comply
with our returns policy set forth below. When products returned to Atlas Sound do not qualify for
repair or replacement under our warranty, repairs may be performed at prevailing costs for material
and labor unless there is included with the returned product(s) a written request for an estimate
of repair costs before any nonwarranty work is performed. In the event of replacement or upon
completion of repairs, return shipment will be made with the transportation charges collect.
EXCEPT TO THE EXTENT THAT APPLICABLE LAW PREVENTS THE LIMITATION OF CONSEQUENTIAL
DAMAGES FOR PERSONAL INJURY, ATLAS SOUND SHALL NOT BE LIABLE IN TORT OR CONTRACT
FOR ANY DIRECT, CONSEQUENTIAL OR INCIDENTAL LOSS OR DAMAGE ARISING OUT OF THE
INSTALLATION, USE OR INABILITY TO USE THE PRODUCTS. THE ABOVE WARRANTY IS IN LIEU OF
ALL OTHER WARRANTIES INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.
Atlas Sound does not assume, or does it authorize any other person to assume or extend on its
behalf, any other warranty, obligation, or liability. This warranty gives you specific legal rights and
you may have other rights which vary from state to state.
Service
Should your Atlas TSD require service, please contact the Atlas Sound
warranty department at 1-877-689-8055, ext. 1274 to obtain an RA number.
Atlas Sound Tech Support can be reached at 1-800-876-3333.
Visit our website at www.AtlasSound.com to see other Atlas products
©2011 Atlas Sound L.P. All rights reserved. Atlas Sound is a trademark of Atlas Sound L.P.
All other trademarks are the property of their respective owners. ATS003935 RevA 5/11
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com
– 12 –
Specifications are subject to change without notice.
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