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Operating Manual - LX-308B Stereo Line/Microphone Mixer
6. CONNECTIONS AND CABLES
6.1 Inputs
The LX-308B stereo inputs use two 20KΩ
balanced 1/4" phone jacks per channel, with (+) signal
on the tip, the (-) signal on the ring, and ground on the
sleeve. If you wish to drive a mono source into the stereo
mix, simply plug your signal into the right channel input.
Channels 1 and 2 are switchable to add 30dB gain for low
impedance dynamic microphones.
6.2 Sub Inputs
The Sub inputs are nominal 10KΩ unbalanced
types on 1/4" phone jacks. They feed directly to the mix
busses at a nominal +4dBu level and are useful for cou-
pling multiple mixers
6.3 Sub Outputs
The Sub Outputs are unbalanced types on 1/4"
phone jacks. Typically, they will feed sub inputs on ad-
ditional mixers. Nominal operating level is +4 dBu.
6.4 Main Outputs
Outputs are 200Ω "pseudo-balanced" 1/4" phone
jacks, which means they have balanced impedance with a
single-ended signal source and can be wired balanced or
unbalanced. Nominal operating level is +4 dBu and maxi-
mum headroom is +22dBu.
6.5 Wiring Suggestions:
If low level and high level lines (e.g., micro-
phones and mixer line outputs), or if either of these lines
and speaker cables are run parallel for long distances,
crosstalk may be significant. In fact, the crosstalk (sig-
nal leakage between cables) can cause an electronic feed-
back loop, oscillation, and possibly damage to the
equipment. To minimize crosstalk, physically separate
low level (microphone) cables from speaker cables by the
greatest feasible distance. At any point where cables meet,
run low level cables perpendicular to high level or speaker
cables. If low and high level or speaker cables must be
run parallel and in close proximity to one another, they
should be bundled separately.
LX308B
Stereo
Eight Channel
Line Level Mixer
RL
9
8
7
6
5
1
2
3
4
Clip
+6
0
-6
-12
-20
Output
VU
-L- -R-
RL
9
8
7
6
5
1
2
3
4
Stereo
Output
Stereo
Output
Mute
100
9
7
6
5
1
2
3
4
On
Ch.8
Mono/Phones
Output
Power
Level PanLevel Pan Mono
Phones
Mute
On
-R-
(Mono)
-L-
Ch.3
-L-
Ch.4
-L-
Ch.5
-R-
(Mic/Mono)
-L-
Ch.2
-R-
(Mic/Mono)
-L-
Ch.1
-R-
(Mono)
-R-
(Mono)