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FRS SERIES AMPLIFIERS
FRS 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
Note:
Because of the high output capability of the am-
plifier, use only Class 3 (CL3) cable.
Use loudspeaker
cables with a mini-
mum conductor size
for the length you
need, as listed in
these tables.
This will minimize
power losses to less
than 0.5 dB. The
cable lengths listed
are “up to” lengths.
For in-between
lengths, use the next
larger conductor
gauge. Using larger
than the recommend-
ed conductor size is always permissible. Using smaller
than recommended conductor size will result in higher
power losses.
2
2
3
1
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1
SLEEVE
TIP
SLEEVE
TIP
RING
RING
TIP
SLEEVE
RING
SLEEVE
TIP
TIP
SLEEVE
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 (–)