TSD-HF11
Application Example
Example of Horn Protection in a Zone 2 from an AA Mixer Amp
AA120
MIC
PRE-OUT
70V SPEAKER OUT
TSD-HF11
PA601
70V SPEAKER OUT
CROSSOVER/
LIMITER HORN
PROTECTION
SET LOW-CUT
FILTER SW AND
ADJUST GAIN AND
LIMITER SEE
MANUAL
AMPLIFIER
FAP42TC
EXISTING DISTRIBUTED AUDIO
ADDED ZONE
AP-30T
LINE COLOR KEY
LINE LEVEL AUDIO SIGNAL
LOUDSPEAKER LEVEL
CONTROL SIGNAL
MIC LEVEL AUDIO SIGNAL
VIDEO
GROUND
120V
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com – 1 –
©2014 Atlas Sound L.P. All rights reserved. Atlas Sound is a trademark of Atlas Sound L.P. All other trademarks are property of their respective owners. ATS004807 RevA 2/14
Specifications are subject to change without notice.
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TSD-HF11
Application Example
Overview:
This example illustrates how to use the TSD-HF11 Crossover/Limiter for speaker protection in a secondary (Zone 2) horn paging system.
Application Example Description:
When using paging horns in any application, damage can easily occur to the horn driver if the audio signal is not properly crossed over
using a high pass filter (low cut filter) or if the power from the amplifier is too great for the driver to handle. The TSD-HF11 is the ideal
solution to protect a horn from these two common failures because it incorporates a crossover and limiter. In this example the TSD-HF11
is being used in a secondary or zone 2 paging system in conjunction with an existing BGM system using the Pre Out of a mixer amplifier to
feed a separate amplifier powering the paging horns.
Benefits:
• Cost Effective Solution
• Excellent Horn Protection
• Easy to Install and Configure
Application Example Notes:
1. Set the high pass filter at a frequency just above the lower operating range of the horn-driver combination. This will remove
unnecessary low frequency energy that can cause distortion and damage to the driver. Set the limiter to a position that limits the signal
to the amplifier therefore limiting the output voltage from the amplifier to an acceptable level for your application and a safe level for
the horn driver.
2. This illustration uses the Atlas Sound AA120 but any amplifier with an audio Pre Out can be used in this application.
3. Any amplifier can be used as long as the total power of the amplifier does not exceed the maximum power of the attached speakers/
horns needed to complete the design. A good rule of thumb is to allow 30% amplifier head room in the amplifier power.
4. The AA120 has several features to consider during setup. Always read the manual to have a complete understanding of the unique
benefits of the AA120.
• Pre-out is POST-low cut filter (if applied) and EQ. The level will change with the 70V out and pre-out when using the level controls.
• When using a PRE–low cut filter and EQ signal, consider using Tape Out or Line Out where the level control is fixed.
5. Before installing the TSD-HF11 know the following:
• Operational frequency response of the speaker(s) being used. Select the appropriate corresponding low cut filter on the TSD-HF11.
• Set the maximum input level to the amplifier via the TSD-HF11 output limiter in order not to damage the speakers by overpowering
them.
6. The TSD-HF11 can be inserted anywhere in an existing 70V speaker level circuit by using a TSD-TXHL (speaker level to line level
converter). See other application drawings.
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
AtlasSound.com – 2 –
©2014 Atlas Sound L.P. All rights reserved. Atlas Sound is a trademark of Atlas Sound L.P. All other trademarks are property of their respective owners. ATS004807 RevA 2/14
Specifications are subject to change without notice.
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