Ashly LX-308B User Manual
LX-308B
Stereo
Line/Microphone
Mixer
Operating Manual
(+30dB)
Mute
On
Line
Mic
Ch.1
5
4
1
Level Pan
6
Mic
(+30dB)
7
8
9
RL
On
Ch.2 Ch.3
Line
5
4
6
7
9
1
RL
Level Pan
Ch.4 Ch.5 Ch.6 Ch.7 Ch.8
5
4
3
8
2
1
Mute
On
5
6
4
7
3
8
2
9
1
RL
MuteMute
On
5
6
4
7
3
8
2
9
1
RL
Mute
On
5
6
4
7
3
8
2
9
1
RL
Mute
On
5
6
RL
6
4
7
8
9
7
3
8
2
9
1
RL
Mute
On
Mute
Level Pan Level PanLevel Pan Mono
On
-L- -R-
5
6
4
7
3
8
2
9
1
RL
Stereo
Mono/Phones
Output
Clip
+6
-12
-20
Output
VU
5
4
0
3
-6
2
1
Level PanLevel PanLevel Pan Level
Output
5
6
4
6
3
7
2
8
1
9
RL
Stereo
Output
Mute
Phones
LX308B
Stereo
7
Eight Channel
Line Level Mixer
9
100
On
Power
ASHLY AUDIO INC.
847 Holt Road Webster, NY 14580-9103 Phone: (716) 872-0010
Toll-Free: (800) 828-6308 Fax: (716) 872-0739
www.ashly.com
Operating Manual - LX-308B Ster eo Line/Microphone Mixer
Table Of Contents
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 SECURITY COVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5 CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 CONNECTIONS AND CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 TYPICAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1 Small Sound Reinforcement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.2 Church, School Or Meeting Room Sound System . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.3 MIDI Recording System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.4 Submixer In Larger Sound System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
9 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
11 WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
12 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
Operating Manual - LX-308B Ster eo Line/Microphone Mixer
1. INTRODUCTION
Congratulations on your purchase of an Ashly
LX-308B stereo line level mixer. The LX308B improves
upon the LX308 with the addition of On/Off switches to all
eight inputs, and peak signal detection on all inputs. Other
features include eight balanced stereo inputs for line level
sources, the first two inputs with switchable 30dB gain for
low impedance dynamic microphones. A concentric level
and pan control for each input adjusts channel volume and
stereo position. Submaster inputs and outputs are provided
for cascading two or more mixers. Ultra low-noise summing amplifiers combine the channel signals for the main
outputs. A pair of 6-segment LED meter arr ays monitor the
main output levels. Separate level contr ols are provided for
stereo, mono, and headphone outputs.
2. UNPACKING
As a part of our system of quality control, every
Ashly product is carefully inspected before leaving the
factory to ensure flawless appearance. After unpacking,
please inspect for any physical damage. Save the shipping carton and all packing materials , as they were carefully designed to reduce to minimum the possibility of
transportation damage should the unit again require pack-
ing and shipping. In the event that damage has occurred,
immediately notify your dealer so that a written claim to
cover the damages can be initiated.
The right to any claim against a public carrier
can be forfeited if the carrier is not notified promptly and
if the shipping carton and packing materials are not available for inspection by the carrier. Save all packing materials until the claim has been settled.
3. AC POWER REQUIREMENTS
The LX-308B mixer will perform normally from
95 to 125 volts AC. Use only properly grounded AC receptacles. To reduce the risk of ground loop hum, use a
central point for system AC power distribution. The AC
line fuse is internal, and should only be changed by a
qualified service technician.
4. SECURITY COVERS
For installations where it is desirable to protect
the front panel controls from tampering or accidental
misadjustment, use the Ashly security cover, which is
available in both single and double rack space sizes. Installation is simple and does not require removal of the
equipment from your rack. See your Ashly dealer for
details.
Ashly Security Cove r Installation
3
Operating Manual - LX-308B Ster eo Line/Microphone Mixer
e
-
Ch.1
Line
Mic
(+30dB)
1
Mute
Level Pan
On
AC
LX308B
Mic/Line
Mixer
120VAC .1A
5. CONTROLS
5.1 Channel Level
This is the individual channel volume control
which feeds a channel to the main mix.
5.2 Channel Pan
Ch.2 Ch.3
5
4
6
RL
Line
Mic
(+30dB)
7
8
9
Mute
On
5
4
1
Level Pan
6
7
8
9
RL
Mute
On
2
5
4
3
1
Level Pan
6
7
8
9
RL
Ch.4 Ch.
5
4
3
2
1
Mut e
Level Pan
On
6
7
8
9
RL
Mute
On
4
3
2
1
L
Lev
50-60Hz
12W
Made In USA
Outputs
-LCh.8
-R-
Mono
-R--L-
Sub Out Sub In
-L-
-R
(Mon
tor the summing amplifiers, making it possible for these
indicators to illuminate even with the stereo output level
turned off.
5.6 Stereo Output Level
This is the main master gain which sets the operating level for the entire mixer. This control does not
effect the mono output level.
This control adjusts the position of the channel
in the stereo mix.
5.3 Mic/Line Switch
This switch on the first two inputs increases the
channel input sensitivity by 30 dB to allow the use of low
impedance dynamic microphones.
5.4 On/Off Switch
This switch on each channel will turn the channel completely off allowing the channel level to remain
at its desired setting when the input is not needed.
5.5 Output Meters
A pair of peak detecting 6-segment LED meters
are used to indicate output level. Green LED's are used
below 0 VU, yellow above 0 VU, and red LED's indicate
clipping. This meter pair monitors the main stereo output (0 VU = +4dBu). T he red clipping LED's also moni-
5.7 Stereo Output Mute
This switch entirely mutes the main stereo output. The headphone and mono output are not affected.
This is particularly useful when the LX-308 is used as a
sub-mixer.
5.8 Mono Level
This is the master gain control for the mono output, which is the combined signal of the left and right
outputs. It has no effect on the stereo output.
5.9 Stereo Headphones Level
This adjusts the volume level of the front panel
headphone jack.
5.10 Power Switch
This switches the AC power to the LX-308B.
When it is pressed in the adjacent LED will become lit.
4
Operating Manual - LX-308B Ster eo Line/Microphone Mixer
Mute
On
-L-
2
3
1
Ch.5
6
RL
-L- -R-
7
8
9
Clip
+6
0
-6
-12
-20
Output
VU
Ch.8
4
5
Ch.4
-R-
(Mono)
-L-
-R-
(Mono)
6. CONNECTIONS AND CABLES
Stereo
Mono/Phones
Output
5
4
3
2
1
Level PanLevel Pan Mono
6
7
8
9
RL
Ster eo
Output
Mu te
3
2
1
Ch.3
-L-
-R-
(Mono)
Output
4
-L-
5
6
100
Phones
Ch.2
(Mic/Mono)
7
9
-R-
6.4 Main Outputs
LX308B
Stereo
Eight Channel
Line Level Mixer
On
Power
Ch.1
-L-
(Mic/Mono)
-R-
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 coupling multiple mixers
6.3 Sub Outputs
The Sub Outputs are unbalanced types on 1/4"
phone jacks. Typically, they will feed sub inputs on additional mixers. Nominal operating level is +4 dBu.
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 maximum headroom is +22dBu.
6.5 Wiring Suggestions:
If low level and high level lines (e.g., microphones 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 (signal leakage between cables) can cause an electronic feedback 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 le v el or speak er
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.
5
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