QSM-4USB
Item ref: 172.884UK
Compact Mixer + USB player
User Manual
Panel Layouts
1
MIC PAN balance between mic 1/2
13
VU output level indicators
2
MICRO combined mic level control
14
Headphones output (front panel)
3
TALK OVER preset music volume cut
15
MIC R input 6.3mm jack
4
LINE 1/PHONO 1 input selector
16
MIC L input 6.3mm jack
5
CHANNEL A level fader
17
LINE 1/PHONO 1 input: L+R RCA
6
USB/PHONO 2 input selector
18
PHONO 2 input: L+R RCA
7
CHANNEL B level fader
19
CD input: L+R RCA
8
STEREO/MONO output selector
20
AMP OUT main output: L+R RCA
9
CD channel level fader
21
Signal GROUND screw
10
CROSSFADER Channel A/B
22
USB type A input (for playback)
11
VOLUME control for output level
23
POWER ON/OFF switch
12
USB player transport controls
24
AC power adaptor input 3.5 jack
172.884UK User Manual
Introduction
Thank you for purchasing the qtx QSM-4USB mixer. This product has been designed
to provide reliable and accurate performance as part of a sound system or recording
setup. Please read and follow the instructions in this manual to get the best from this
item and avoid damage through misuse.
Warning
To prevent the risk of fire or electric shock, do not expose any of the components to
rain or moisture. If liquids are spilled on the casing, stop using immediately, allow
unit to dry out and have checked by qualified personnel before further use.
Avoid impact, extreme pressure or heavy vibration to the case
No user serviceable parts inside. Refer all servicing to qualified service personnel.
Keep away from direct sunlight, heat sources, damp or dusty environments
Use a soft cloth with a neutral detergent to clean the casing as required
Do not use strong solvents for cleaning the unit
Connections
Before using this unit, make sure that the AC Adaptor is the correct voltage.
The unit is fitted with 2 unbalanced main output RCA connections for an amplifier or
recording equipment.
The MIC L (15) and MIC R (16) inputs each accept a microphone on 6.3mm jack.
On the rear panel are 3 stereo inputs – Line 1/Phono 1, Phono 2 and CD
LINE 1/PHONO 1 INPUT (17) will accept turntable input or can be switched to
accept line level signal (CD, mp3 player, PC etc.)
PHONO 2 INPUT (18) will accept turntable input.
CD INPUT (19) will accept any line level input such as a CD, mp3 player or PC.
An EARTH SCREW (21) for earthing turntables to is located on the rear panel.
A USB socket (22) on the top panel accepts a USB storage device for playback of
digital audio tracks stored on the device.
Headphones can be plugged into the front panel mounted HEADPHONE (14) jack.
Operation
POWER ON: Once you have made all the equipment connections to your mixer, turn
down the rotary VOLUME (11) control fully and switch on the POWER BUTTON
(23). The power will turn on and the power LED will illuminate.
Increasing the VOLUME control gradually increases the output level until the desired
volume is reached. This can be checked with a known input source with its channel
level up full.
172.884UK User Manual
CHANNEL A: SWITCH (4) allows you to select the PHONO 1/LINE 1 (17) RCA
Previous track
Play/Pause
Next track
Power supply
12Vac, 500mA (included)
Frequency response
20Hz - 20kHz @ ±0.5dB
Headphone output
200mW max. 8 ohms
Input : Line
150mV, 100k ohms
Input : Mic
1mV, 1k ohms
Input : Phono
3mV, 50k ohms
Output : Master
1.5V, 600 ohms
Signal to noise ratio : Line
80dB
Signal to noise ratio : Mic
70dB
Signal to noise ratio : Phono
70dB
T.H.D.
0.02%
Dimensions
230 x 131 x 55mm
Weight
776g
input as phono or line level input. The CHANNEL FADER (5) controls the input
level of this channel.
CHANNEL B: SWITCH (6) allows you to select between the PHONO 2 (18) RCA
input or internal USB (22) player. The CHANNEL FADER (7) controls the input
level of this channel.
Transport controls for the USB player (12) are located below the USB socket,
operating as below,,,
CD CHANNEL: The CD channel fader (9) controls the input level of CD input (19)
CROSSFADER: The CROSSFADER (10) fades across channels A and B
TALKOVER (3) The purpose of the talkover section is to allow the music output to
be muted so that the mic can be heard above the music. When the button is
pressed, the talkover will be active and the volume of all sources except the Mic
inputs will be lowered by 12 dB.
The MIC PAN (1) allows you to select the level balance between MIC L and MIC R
inputs (15, 16) and the MICRO (2) allows you to control the level of MIC inputs to
the main output.
The STEREO MONO (8) switch allows selection of Mono or Stereo output
Output indicator: The Output Level LEDs (13) indicate MASTER output L & R levels.
Specifications
Errors and omissions excepted.
Copyright© 2013. AVSL Goup Ltd
172.884UK User Manual
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