ASA 204 and ASA 304 • User Guide
About the ASA Series
The Extron ASA series high-performance audio summing amplifiers convert stereo audio signals into balanced or
unbalanced mono signals. The series consists of the following two models:
• ASA 204 — The ASA 204 has four independent active summing amps with four pairs of RCA connectors for
unbalanced line level stereo audio inputs. The unit has captive screw connectors for four balanced or unbalanced
mono outputs. Because of its input/output configuration, the ASA 204 can also function as an unbalanced to
balanced audio converter.
• ASA 304 — The ASA 304 has four independent active summing amps with four 5-pole captive screw connectors
for balanced or unbalanced line level stereo audio inputs. The unit has captive screw connectors for four balanced or
unbalanced mono outputs.
The ASA 204 and ASA 304 include an external 12V power supply that accepts 100-240VAC input.
Features
• Four, independent active audio summing amplifiers in a single enclosure
• Stereo inputs on RCA connectors, mono output on captive screw connectors
• Converts stereo audio to balanced or unbalanced mono audio
• ±6 dB output gain switch
• Rack-mountable 1U, quarter rack width metal enclosure
• Extron Everlast Power Supply (included) is covered by a 7-year parts and labor warranty
Installation and Operation
Mounting the ASA 204 and ASA 304
The ASA 204 and ASA 304 can be set on a table, or mounted on a rack shelf, under a desk or tabletop, or on a projector
mount.
Tabletop placement
Attach the four provided rubber feet to the bottom of the unit and place it on a convenient tabletop location.
Rack mounting
For optional rack mounting, do not install the rubber feet. Mount the ASA on a 19” 1U rack shelf or a standard universal
1U rack shelf. On the standard rack shelf, the ASA mounts in one of four locations to the rear of the rack or in one of four
locations to the front of the rack.
1. Remove rubber feet if they were previously installed on the
bottom of the ASA.
2. Mount the ASA on the rack shelf, using two 4-40 x 3/16”
screws in opposite (diagonal) corners to secure the amplifier
to the shelf.
3. Install blank panels or other units on the rack shelf (see the
image on the right).
4. Attach the rack shelf to the rack using the supplied bolts.
NOTE: Most 1U rack-mountable Extron products can be
mounted on the standard shelf.
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ASA 204 and ASA 304 • User Guide (Continued)
11
POWER
12V
.2A MAX
STEREO INPUTS
MONO OUTPUTS
BAL
UNBAL
ON
SPARE
3
1
4
2
43
21
L
QUAD AUDIO
SUMMING
AMPLIFIERS
R
ASA
204
L
L
R
R
11 22
3
3
4
4
Slee
No Ground Here
Unbalanced Audio InputBalanced Audio Input
Slee
Do not tin the wires!
ASA 204/ASA 304 Front Panel Features
Power LED — Lights to indicate that the ASA is on.
1
Figure 1. ASA 204 and ASA 304 Front Panel
ASA 204/ASA 304 Rear Panel Features and Cabling
1122
QUAD AUDIO
SUMMING
AMPLIFIERS
POWER
12V
.2A MAX
4
4
STEREO INPUTS
LR
1
LR
2
LR
LR
3
4
MONO OUTPUTS
1
3
2
4
ASA
304
SPARE
ON
UNBAL
BAL
333
3
Figure 2. ASA 204 Rear Panel Figure 3. ASA 304 Rear Panel
Input Connector
1
Output Connector
2
Wire the audio input and output connectors as shown at
right. Use the supplied tie wrap to strap the audio cable
to the extended tail of the connector.
Output gain DIP switch
3
Power connector
4
Tip
Ring
ves
Tip
Ring
Balanced Audio Output
Tip
Ring
ves
Tip
Ring
LR
LR
Tip
Sleeves
Tip
No Ground Here
Unbalanced Audio Output
Tip
Sleeve
Tip
Sleeve
LR
LR
Tip(L)
Ring(R)
Sleeve ( )
RCA Connector
ATTENTION:
• Connect the sleeve to ground (Gnd). Connecting the sleeve to a negative (-) terminal will damage the audio
output circuits.
• Connectez le manchon à la borne de terre (Gnd). Connecter le manchon à une borne négative(-) endommagera
les circuits de la sortie audio.
• For unbalanced outputs, do not connect wires to the “-” poles (see the Extron Audio Wiring Card).
• Pour les sorties asymétriques, ne connectez pas de câbles aux pôles « - » (voir le Audio Wiring Card d’Extron).
• The length of exposed wires is critical. The ideal length is 3/16 inch (5 mm).
2
• La longueur des câbles exposés est primordiale lorsque l’on entreprend de les dénuder. La longueur idéale est
de 5mm (3/16inches).
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