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14
FR SERIES AMPLIFIERS
FR SERIES AMPLIFIERS
Appendix B: Connections, math and stuff
1/4" TS Phone Plugs and
Jacks
“TS” stands for Tip-Sleeve, the two connections avail-
able on a mono 1/4" phone jack or plug. They are used
for unbalanced signals.
1/4" TS Unbalanced Wiring
Sleeve = Shield
Tip = Hot (+)
Speakons
When using the Speakon outputs in stereo or mono
modes, wire the Speakon connectors as shown below:
Stereo and Mono Speakon Connection
Loudspeaker Cable
Use loudspeaker cables with a minimum conductor
size for the length you need as listed in these tables.
This will minimize
power losses to less
than 0.5 dB. The ca-
ble lengths listed are
“up to” lengths. For
in-between lengths,
use the next larger
conductor gauge.
Using larger than the
recommended con-
ductor size is always
permissible. Using
smaller than recom-
mended conductor
size will result in
higher power losses.
The recommended conductor gauges are listed for
AWG (American Wire Gauge) and Metric WG (Metric
Wire Gauge). Note that smaller AWG numbers = larger
2
2
3
1
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1
SLEEVE
TIPSLEEVE
TIP
RING
RING
TIP
SLEEVERING
SLEEVE
TIP
TIPSLEEVE
TIP
SLEEVE
Minimum AWG 4 ohm 8 ohm
18 10 ft 25 ft
16 25 50
14 25 75
12 50 125
10 100 200
Min Metric WG 4 ohm 8 ohm
12 3 m 8 m
14 8 15
16 8 25
20 15 40
25 30 60
COLD
HOT
1+
1+
1–
1–
2–
2+
Use a high-quality 3-conductor shielded cable to
connect the signal between the signal source (mixing
console, equalizer, etc.) and the balanced inputs to
the amplifier. If you are using unbalanced inputs, use a
high-quality 2-conductor shielded cable. Here are some
common audio connectors and their internal wiring:
XLR Connectors
XLR connectors are commonly wired as follows (ac-
cording to standards specified by the Audio Engineering
Society):
XLR Balanced Wiring
Pin 1 = Shield
Pin 2 = Hot (+)
Pin 3 = Cold (–)
1/4" TRS Phone Plugs and
Jacks
“TRS” stands for Tip-Ring-Sleeve, the three connec-
tions available on a stereo 1/4" or balanced phone jack
or plug. TRS jacks and plugs are used for balanced
signals and stereo headphones.
1/4" TRS Balanced wiring
Sleeve = Shield
Tip = Hot (+)
Ring = Cold (–)