Extron electronic Stereo System BUC 202 User Manual

User Guide  
Audio Converter  
BUC 202  
Two Channel Balanced and  
Unbalanced Audio Converter  
68-2351-01  
Rev. A  
03 14  
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FCC Class B notice  
This equipment has been tested and found to comply with the limits for a Class B digital  
device, pursuant to part 15 of the FCC rules. These limits provide reasonable protection  
against harmful interference in a residential installation. This equipment generates, uses, and can  
radiate radio frequency energy and, if not installed and used in accordance with the instructions,  
may cause harmful interference to radio communications. There is no guarantee that interference will  
not occur. If this equipment does cause interference to radio or television reception, which can be  
determined by turning the equipment off and on, you are encouraged to try to correct the interference  
by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Connect the equipment into an outlet on a circuit different from that to which the receiver is  
connected.  
Consult the dealer or an experienced radio/TV technician for help.  
nOTE: For more information on safety guidelines, regulatory compliances, EMI/EMF compatibility,  
accessibility, and related topics, see the “Extron Safety and regulatory compliance  
Guide” on the Extron website.  
Conventions used in this guide  
notifications  
The following notifications are used in this guide:  
CauTIOn: A caution indicates a situation that may result in minor injury.  
warnIng: A warning indicates a situation that has the potential to result in death or  
severe injury.  
aTTEnTIOn: Attention indicates a situation that may damage or destroy the product or  
associated equipment.  
Specifications availability  
Product specifications are available on the Extron website, www.extron.com.  
copyright  
© 2014 Extron Electronics. All rights reserved.  
Trademarks  
All trademarks mentioned in this guide are the properties of their respective owners.  
The following registered trademarks®, registered service marks(Sm), and trademarks(Tm) are the property of  
rGB Systems, Inc. or Extron Electronics:  
registered Trademarks(®)  
AVTrac, Cable Cubby, CrossPoint, eBUS, EDID Manager, EDID Minder, Extron, Flat Field, GlobalViewer, Hideaway, Inline, IP Intercom, IP Link,  
Key Minder, LockIt, MediaLink, PlenumVault, PoleVault, PowerCage, PURE3, Quantum, SoundField, SpeedMount, SpeedSwitch,  
System INTEGRATOR, TeamWork, TouchLink, V-Lock, VersaTools, VN-Matrix, VoiceLift, WallVault, WindoWall, XTP, and XTP Systems  
registered Service mark(Sm) : S3 Service Support Solutions  
Trademarks()  
AAP, AFL (Accu-Rate Frame Lock), ADSP (Advanced Digital Sync Processing), Auto-Image, CDRS (Class D Ripple Suppression), DDSP (Digital  
Display Sync Processing), DMI (Dynamic Motion Interpolation), Driver Configurator, DSP Configurator, DSVP (Digital Sync Validation Processing),  
FastBite, FOXBOX, IP Intercom HelpDesk, MAAP, MicroDigital, ProDSP, QS-FPC (QuickSwitch Front Panel Controller), Scope-Trigger, SIS,  
Simple Instruction Set, Skew-Free, SpeedNav, Triple-Action Switching, XTRA, ZipCaddy, ZipClip  
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Contents  
Introduction ....................................................1  
Features ............................................................. 1  
Application Example........................................... 2  
Setup and Operation ......................................3  
Rear Panel Features and Cabling........................ 3  
Front Panel Feature ............................................ 5  
Adjusting the Trim............................................... 5  
Mounting.........................................................6  
UL Rack Mounting Guidelines............................. 6  
Tabletop Mounting.............................................. 6  
Rack Rail and Under-Furniture Mounting ............ 6  
Rack Rail Mounting......................................... 7  
Under-Furniture Mounting............................... 8  
Rack Shelf Mounting ........................................ 10  
BUC 202 User Guide • Contents  
iv  
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Introduction  
The Extron BUC 202 is a two channel balanced and unbalanced audio converter and audio  
line driver. It features two balanced or unbalanced inputs and outputs, both on captive  
screw connectors. The BUC 202 provides two independent channels of signal matching  
between unbalanced and balanced audio equipment. Two rotary switches provide precise  
trim adjustment from -21 to +21 dB in clearly-labeled 3 dB steps. In addition to serving as  
an interface from consumer products to professional AV systems, the BUC 202 is a high-  
quality line driver for sending and receiving audio signals up to 1,000 feet (300 m). The  
unique 1U, quarter rack width enclosure, together with the included patented ZipClip 200  
mounting bracket, offers the versatility to install the BUC 202 in a discreet location, such as  
on a rack rail, beneath a table, or within a lectern.  
Features  
Converts unbalanced audio signals to balanced signals and balanced signals to  
unbalanced signals  
Active balancing circuitry  
Audio line driver for long distance audio signal transmission  
Independent, variable trim control on each channel with wide, 42 dB adjustment range  
Versatile 1U, quarter rack width enclosure allows installation on a rack rail, beneath a  
table, or within a lectern  
Patented ZipClip 200 mounting kit included:  
Mounts securely on a variety of surfaces, including rack rails, tables, lecterns,  
and table legs  
Wire tie slots for proper strain relief and dressing of excess cable  
Quick release tab allows for easy installation and removal  
BUC 202 User Guide • Introduction  
1
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Application Example  
The illustration below is one example of configuring a system using the BUC 202.  
Extron  
BUC 202  
Two Channel  
Audio BUC  
2
BUC 20  
S
2
OUTPUT  
1
TS  
2
U
P
IN  
1
2
0
TRIM  
-6  
3
6
9
60Hz  
-
50  
-3  
2
1
15  
18  
X
1
0
MA  
-9  
0V  
3
6
0.2A  
9
2
-3  
-6  
-9  
-1  
1
2
100-24  
12  
15  
5
-1  
-1  
8
-2  
1
Extron  
2
18  
21  
-1  
15  
-
8
-2  
1
-1  
STP20-2 Cable  
Serial Control/Audio Cable  
PC  
)
(
1
2
T
SE  
3
2
-
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E
R
R
N
LA  
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x
R
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2
4
3
6
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2
2
3
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5
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R
RMOTE  
1
3
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I
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x
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3
6
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OPUT  
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4
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Extron  
R
E
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O
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P
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A
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1
M/CLEINPUTS  
DMP 64  
Digital Matrix  
Processor  
0V  
7
-
3C  
0
20  
A
P
X
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I
IR  
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2
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70V  
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CLASS  
OU  
/8  
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IT  
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NDB  
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3
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17 IO  
D
T
A
A
U
A
R
P
AP  
Extron  
XPA 2003C 70V  
Combo Power Ampliꢀer  
Extron  
SI 26CT  
Two-Way Ceiling  
Speakers  
Extron  
SI 28  
Surface-Mount  
Speakers  
Figure 1. BUC 202 Application Example  
BUC 202 User Guide • Introduction  
2
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Setup and Operation  
The Setup and Operation section describes:  
Rear Panel Features and Cabling  
100-240V 50/60 Hz  
0.2A MAX  
BUC 202  
OUTPUTS  
INPUTS  
1
TRIM  
1
2
2
2
1
0
0
-3  
-6  
3
-3  
-6  
3
6
6
-9  
9
-9  
9
-12  
-15  
-12  
-15  
12  
12  
15  
15  
-18  
-18  
18  
18  
-21  
-21  
21  
21  
A
B
D
C
AC power  
Input connector  
A
B
C
Trim adjustment  
Output connector  
D
Figure 2. BUC 202 Rear Panel  
AC power — Connect to standard AC power: 100 to 240 VAC, at 50 or 60 Hz.  
A
B
Trim adjustment (channels 1 and 2) — Adjust the audio input level for the channel  
using the 16-position rotary switch. This switch sets the level in 3 dB increments from  
-21 dB to +21 dB. The arrow on the shaft indicates the current setting.  
TRIM  
2
1
0
0
-3  
-6  
3
-3  
-6  
3
6
6
9
-9  
9
-9  
-12  
-15  
-12  
-15  
12  
12  
15  
15  
-18  
-18  
18  
18  
-21  
-21  
21  
21  
Figure 3.  
BUC 202 16-position Rotary Switches  
NOTE: Unity gain (0 dB) for both channels is at the 12 o’clock (vertical) position  
with the arrow on the shaft pointing to the 0 position. When the switch is set to the  
bottom position (indicated by a dot) the signal is muted (see Adjusting the Trim  
on page 5).  
BUC 202 User Guide • Setup and Operation  
3
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Input connector — This 3.5 mm, 5-pole captive screw connector accepts line level  
balanced or unbalanced, mono or stereo audio signals (see to the illustrations below for  
proper wiring).  
C
ATTENTION: The length of the exposed wires in the stripping process is critical.  
The ideal length is 3/16 inches (5 mm). Any longer and the exposed wires may  
touch, causing a short circuit between them. Any shorter and the wires can be  
easily pulled out even if tightly fastened by the captive screws.  
NOTE: Do not tin the wires. Tinned wires are not as secure in the connector and  
could be pulled out.  
Tip  
Ring  
Tip  
Sleeves  
Tip  
Ring  
Sleeve  
Ring  
Balanced Stereo Input  
Balanced Dual Mono Input  
Do not tin the wires!  
Tip  
Sleeve  
Tip  
Tip  
Sleeve  
Sleeve  
Unbalanced Stereo Input  
Unbalanced Dual Mono Input  
Figure 4.  
Audio Input Connectors  
Output connector — The 3.5 mm, 5-pole captive screw connector outputs balanced  
or unbalanced line level audio (see the illustrations below for proper wiring).  
D
ATTENTION: For unbalanced audio output, connect sleeves to the center ground  
pin. DO NOT connect sleeves to the negative (–) contacts.  
NOTE: Do not tin the wires. Tinned wires are not as secure in the connector and  
could be pulled out.  
No Ground Here  
Tip  
Ring  
Sleeves  
Tip  
Tip  
Sleeves  
Tip  
Ring  
No Ground Here  
Do not tin the wires!  
Balanced Audio Output  
Unbalanced Audio Output  
Tip-ring-sleeve and tip-sleeve connections:  
Tip (L)  
Ring (R)  
Tip (+)  
Sleeve (  
)
Sleeve (  
)
Tip-Ring-Sleeve  
Tip-Sleeve  
Figure 5.  
Audio Output Connectors  
BUC 202 User Guide • Setup and Operation  
4
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Front Panel Feature  
BUC 202  
A
Figure 6. BUC 202 Front Panel  
Power LED — The green lights when the BUC 202 is receiving power.  
A
Adjusting the Trim  
The BUC 202 can be wired in four different configurations:  
Balanced input to unbalanced output  
Unbalanced input to balanced output  
Balanced input to balanced output  
Unbalanced input to unbalanced output  
Follow the steps below to adjust the trim:  
1. Disconnect power from all devices.  
2. Wire the BUC 202 for either balanced or unbalanced stereo or dual mono audio input.  
3. Wire the BUC 202 for either balanced or unbalanced audio output.  
4. Set the trim adjustment:  
a. Determine the input and output signal types (balanced or unbalanced) and whether  
it is consumer or professional audio.  
Find the trim adjusment setting according to the table below.  
Balanced  
Unbalanced  
Output  
Consumer1  
Consumer1  
Professional2  
Professional2  
Input  
Consumer1  
Professional2  
Consumer1  
0 dB  
-12 dB  
0 dB  
12 dB  
6 dB  
18 dB  
Balanced  
Unbalanced  
NOTES:  
-6 dB  
0 dB  
6 dB  
6 dB  
12 dB  
18 dB  
Professional2  
-12 dB  
-6 dB  
0 dB  
6 dB  
1 Consumer line level is -10 dBV ≈ -8 dBu.  
2 Professional line level is +4 dBu.  
b. Use a small screwdriver to turn the appropriate trim adjustment switch to the  
desired setting.  
5. Reconnect power to all devices to test the audio.  
6. If necessary, readjust the trim.  
BUC 202 User Guide • Setup and Operation  
5
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Mounting  
The Mounting section describes:  
UL Rack Mounting Guidelines  
The following Underwriters Laboratories (UL) guidelines pertain to the safe installation of the  
BUC 202 in a rack.  
1. Elevated operating ambient temperature — If installed in a closed or multi-unit rack  
assembly, the operating ambient temperature of the rack environment may be greater  
than room ambient temperature. Therefore, install the BUC 202 in an environment  
compatible with the maximum ambient temperature (Tma = +122 °F, +50 °C) specified  
by Extron.  
2. Reduced air flow — Install the equipment in a rack so that the amount of air flow  
required for safe operation of the equipment is not compromised.  
3. Mechanical loading — Mount the equipment in the rack so that a hazardous  
condition is not achieved due to uneven mechanical loading.  
4. Circuit overloading — Connect the equipment to the supply circuit and consider the  
effect that circuit overloading might have on overcurrent protection and supply wiring.  
Appropriate consideration of equipment nameplate ratings should be used when  
addressing this concern.  
5. Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted  
equipment. Pay particular attention to supply connections other than direct connections  
to the branch circuit (as an example, use of power strips).  
Tabletop Mounting  
To mount the unit on a desk or tabletop, set the unit on a tabletop.  
Rack Rail and Under-Furniture Mounting  
NOTE: To properly mount the BUC 202 on a rack rail or under furniture use the Extron  
ZipClip 200 Mounting Clip.  
BUC 202 User Guide • Mounting  
6
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Rack Rail Mounting  
2  
C
B
ZipClip 200  
B
U
C
2
0 2  
Side of Rack  
02  
2
C
S
UT  
BU  
2
P
UT  
O
1
S
UT  
2
NP  
I
1
M
2
I
TR  
M
3
5
6
9
0
2
12  
15  
18  
TRI  
-3  
6
-
-
z
9
1
H
2
0
1
0
6
9
-1  
3
8
21  
-
/6  
2
-1  
15  
1
-
1
50  
X
MA  
3
-
6
-
8
1
V
A
2
-9  
21  
40  
2
.
12  
-
-
-
0
1
-2  
0
15  
-1  
8
10  
Back of  
Rack  
Inside of Rack  
Figure 7. BUC 202 Rack Rail Mounting  
1. Fasten the ZipClip 200 mounting clip to a convenient location on a rack rail using two  
rack screws.  
2. Insert the bottom of the BUC 202 into the clip, starting with one end.  
3. Pivot the other end of the unit toward the clip and press until the BUC 202 snaps into  
place.  
4. To secure any loose cables and to provide strain relief, attach tie wraps (“zip ties”)  
around the tie wrap notches on the BUC 202 and through the anchor points on the  
mounting clip.  
1
0
0
4
.2  
0
V
A
0
A
/6  
X
M
0
z
T
R
1
I
M
-6-3  
0
-9  
-1  
3
2
6
9
-1  
2
5
I
N
1
-1  
-6  
-3  
8
0
P
U
1
2
-
9
B
-2  
-
3
T
S
1
1
5
1
2
U
6
C
2
1
1
8
-
1
5
20  
9
-1  
8
2
12  
15
O
2
-2  
U
1
T
P
2118  
U
T
1
S
2
Tie Wrap  
ATTENTION: Connect and pull the tie wraps until they are secure.  
Do not overtighten.  
BUC 202 User Guide • Mounting  
7
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5. To remove the BUC 202 from the ZipClip 200 mounting clip, press down on the locking  
tab ( ) while lifting up on the unit ( ).  
1
2
2
BUC  
2
02  
1
Under-Furniture Mounting  
1
ZipClip 200  
2
1
-
1
8
-
1
5
-
1
1
2
8
1
9
-
2
1
-
5
1
8
-
-
1
1
2
6
2
5
1
-
0
1
0
1
2
9
8
6
0
1
0
-
3
0
V
2
4
-
9
0
1
5
2
6
-
6
/
0
1
9
-
6
3
2
H
T
z
R
I
M
1
2
N
I
P
U
T
S
1
O
U
2
T
P
U
T
S
B U  
C
2
0
2
Furniture Mounted  
BUC 202  
Figure 8. BUC 202 Under-Furniture Mounting  
NOTE: The ZipClip is shipped with a set of four wood screws.  
1. Attach the ZipClip to the furniture using two or more wood screws ( ). Make sure the  
1
clip is oriented with the appropriate side facing the mounting surface and with the tab  
accessible from the front of the furniture.  
2. Insert the bottom of the BUC 202 into the clip, starting with one end ( ).  
2
3. Pivot the other end of the unit toward the clip and press until the BUC 202 snaps into  
place.  
BUC 202 User Guide • Mounting  
8
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4. To secure any loose cables and to provide strain relief, attach tie wraps (“zip ties”)  
around the tie wrap notches on the BUC 202 and through the anchor points on the  
mounting clip.  
1
0
0
4
.2  
0
V
A
0
A
/6  
X
M
z
T
R
1
I
M
-6-3  
0
-9  
-1  
3
2
6
9
-1  
2
5
I
N
1
-1  
-6  
-3  
8
0
P
U
1
2
-
9
B
-2  
-
3
T
S
1
1
5
1
2
U
6
C
2
1
8
-
1
1
5
20  
9
-1  
8
2
12  
15
O
2
-2  
U
1
T
P
2118  
U
T
1
S
2
Tie Wrap  
ATTENTION: Connect and pull the tie wraps until they are secure.  
Do not overtighten.  
5. To remove the BUC 202 from the ZipClip 200 mounting clip, press down on the locking  
tab ( ) while lifting up on the unit ( ).  
1
2
2
BUC 20  
2
1
BUC 202 User Guide • Mounting  
9
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Rack Shelf Mounting  
2
RSB 123  
Rack Shelf  
BUC  
2
0
2
1
(2) 4-40 x 3/16"  
Screws  
Rack Mounted  
Figure 9. BUC 202 Rack Shelf Mounting  
1. Align the threaded holes in the bottom of the BUC 202 with the holes in an Extron rack  
shelf ( ). Fasten the unit to the shelf with two 4-40 x 3/16-inch screws.  
1
2. Bolt the rack shelf to the rack ( ).  
2
BUC 202 User Guide • Mounting  
10  
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Extron Warranty  
Extron Electronics warrants this product against defects in materials and workmanship for a period of three years  
from the date of purchase. In the event of malfunction during the warranty period attributable directly to faulty  
workmanship and/or materials, Extron Electronics will, at its option, repair or replace said products or components,  
to whatever extent it shall deem necessary to restore said product to proper operating condition, provided that it is  
returned within the warranty period, with proof of purchase and description of malfunction to:  
USA, Canada, South America,  
and Central America:  
Extron Electronics  
1230 South Lewis Street  
Anaheim, CA 92805  
U.S.A.  
Japan:  
Extron Electronics, Japan  
Kyodo Building, 16 Ichibancho  
Chiyoda-ku, Tokyo 102-0082  
Japan  
Europe and Africa:  
Extron Europe  
Hanzeboulevard 10  
3825 PH Amersfoort  
The Netherlands  
China:  
Extron China  
686 Ronghua Road  
Songjiang District  
Shanghai 201611  
China  
Asia:  
Middle East:  
Extron Asia Pte Ltd  
135 Joo Seng Road, #04-01  
PM Industrial Bldg.  
Singapore 368363  
Singapore  
Extron Middle East  
Dubai Airport Free Zone  
F12, PO Box 293666  
United Arab Emirates, Dubai  
This Limited Warranty does not apply if the fault has been caused by misuse, improper handling care, electrical  
or mechanical abuse, abnormal operating conditions, or if modifications were made to the product that were not  
authorized by Extron.  
NOTE: If a product is defective, please call Extron and ask for an Application Engineer to receive an RA (Return  
Authorization) number. This will begin the repair process.  
USA:  
Asia:  
714.491.1500 or 800.633.9876  
65.6383.4400  
Europe:  
Japan:  
31.33.453.4040  
81.3.3511.7655  
Units must be returned insured, with shipping charges prepaid. If not insured, you assume the risk of loss or damage  
during shipment. Returned units must include the serial number and a description of the problem, as well as the  
name of the person to contact in case there are any questions.  
Extron Electronics makes no further warranties either expressed or implied with respect to the product and its quality,  
performance, merchantability, or fitness for any particular use. In no event will Extron Electronics be liable for direct,  
indirect, or consequential damages resulting from any defect in this product even if Extron Electronics has been  
advised of such damage.  
Please note that laws vary from state to state and country to country, and that some provisions of this warranty may  
not apply to you.  
Extron Asia  
Extron India  
Extron Headquarters  
Extron Europe  
Extron Japan  
Extron China  
Extron Middle East  
Extron Korea  
+65.6383.4400  
+65.6383.4664 FAX  
1.800.3070.3777  
(Inside India Only)  
+1.800.633.9876 (Inside USA/Canada Only)  
+800.3987.6673  
(Inside Europe Only)  
+81.3.3511.7655  
+81.3.3511.7656 FAX  
+86.21.3760.1568  
+86.21.3760.1566 FAX  
+971.4.299.1800  
+971.4.299.1880 FAX  
+82.2.3444.1571  
+82.2.3444.1575 FAX  
Extron USA - West  
+1.714.491.1500  
Extron USA - East  
+1.919.850.1000  
+91.80.3055.3777  
+31.33.453.4040  
+91.80.3055.3737 FAX  
+1.714.491.1517 FAX  
+1.919.850.1001 FAX  
+31.33.453.4050 FAX  
© 2014 Extron Electronics All rights reserved. www.extron.com  
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