KAWAI
KLCS
(Kawai Lab Communication System)
Music Teaching Lab System
Chapter 1
Introducing the Music Teaching Lab
System
The Music Teaching Lab System allows a teacher to
instruct and monitor up to 48 student workstations with
one student at each station in stereo. Any of the 48
student stations may be assigned to one of four practice
groups.
Alternately, the system can operate in “split mode”
allowing the teacher to instruct and monitor up to 48
student workstations with two students at each station in
mono. Practice groups are not available in the split mode
of operation.
A typical Music Teaching Lab System consists of the
Remote, a Hub, Headsets and Student interface boxes.
Features
Students can be assigned to work privately, in pairs, in
groups or all together. Individual students, paired
students or grouped students can be combined to form
larger groups. An external audio source such as a CD
player or teacher’s computer may be connected to the
system for playing instructional or reference material. An
audio recorder may be connected to the system for
recording lab sessions or performances. The lab controller
system is self contained and does not require additional
computer hardware or software.
Chapter 2
System Components
The KLCS components have been designed to facilitate
ease of installation and use.
Control Module – Large sliders and
buttons enable easy selection of students and adjustment
of settings. The small footprint allows the control module
to be stationed right on top of the teacher piano.
Hub – Input and output jacks expand
the function of the KLCS. Use the REC Out to send audio
from any student or group to a computer or CD recording
device. CD In lets the teacher play external music through
the system for listening examples and play-along. The
Mon. Out allows the lab to be heard in the room through
an amplified external speaker system.
Expansion Kit (option) – The basic
KLCS kit accommodates 8 students. The expansion kit
allows the addition of 8 additional students to the KLCS
lab, up to a total of 48 students (five expansion kits). The
Expansion kit consists of the expansion board and eight
individual cables, student boxes and headphones.
Headsets – The over-the-ear
headsets are durable for long life. The adjustable
microphone and earpiece positioning ensure a custom fit
for every student.
Student Box –Two headphone
connections in each student box allows 2 students to
learn at each keyboard using the split function. Computer
connections in the student box enable audio to be sent to
and from a computer at each student instrument.
Cables –The standard RJ-45 (8conductor telephone-type) cables are specially designed
for optimum audio transmission with minimal noise and
signal fade. The cables are 30’ in length; longer or shorter
custom lengths can be made.
******* Important Note *******
Do not connect the Hub power supply until all
other cable inter connections are made to prevent
damage to the lab system hub, as the end of the
cords may come in contact with each other or
other ground points during installation and can
cause the unit to short if the power supply is
connected.
**********************************
Chapter 3
QUICK START
The following section outlines the input and output
connectors, the front panel controls and the front panel
switches. For a more detailed description of how the
controller works, refer to Chapter 4 (OPERATION OF
THE CONTROLLER).
System Connections
The following is a description of what each input or output
connection does and what it should connect to in the lab
system. Not all of the connections are necessary to make
the system operational. For instance, an audio recorder
may not be available to record lab performances or a
small monitoring system may not be available for external
monitoring. However, a CD player may be useful for
reference purposes.
The Classroom HUB
The Hub is the center of your system. All the pieces of
your system connect to this unit. Place the Hub in a
centralized location with access to an electrical outlet.
•
Remote – Connection for the Teachers Controller
Module use the supplied RJ-45 cables (8 conductor
telephone type cables), it is not recommended to
extend the cable length over 13 meters as the
cable carries digital information and longer cable
lengths will increase the resistance and can make
the unit function incorrectly.
•
Teacher - Connect to “Student Box” from the
teacher’s instrument, use with the supplied RJ-45
cable (8 conductor telephone type cable).
Connect the teacher headset into the jacks on the
Interface box. Insert the blue microphone plug into
the “Student 1 Mic” jack. Insert the black
headphone plug into the “Student 1 Phones” jack.
• POWER Switch and POWER Jack - The POWER
ON/OFF switch and POWER jack are located on
the right side of the Hub on the rear panel. Use the
supplied power transformer only. Other power
transformers may damage the controller and void
your warranty.
• Mon. Out - Connect these outputs to an external
monitoring system such as a public address or
stereo system. These connections allow external
monitoring of the CD INPUT, AUX INPUT,
Teacher’s instrument, Student instruments and
Teacher’s microphone when selected.
• Rec. Out - Connect these outputs to the inputs of a
recording device such as an audio tape recorder or
digital recorder. These connections allow recording
of the lab session to a recording device when
connected, routing audio from the teacher’s
microphone, teacher’s instrument and students’
instruments when selected.
• Aux. In - Connect these inputs to the outputs of an
audio playback device such as an tape deck, digital
recorder, teacher’s computer or auxiliary sound
source. These connections allow monitoring of a
recording device when connected.
• CD In - Connect these inputs to the outputs of a
CD player. Allows monitoring of a CD player when
connected.
• USB – Reserved for future use.
The Teacher Controller Module
Volume Controls on Teachers Control Module
•
TEACHERS MIC.
Controls the level of the teacher’s microphone.
•
TEACHERS HEADPHONE
Controls the level of the teacher’s headphones.
•
MONITOR VOLUME
Controls the audio level sent to an external
MONITOR system.
•
CD/AUX INPUT
Controls the audio level received from a tape
recorder or CD player, teacher’s computer or
auxiliary input source, whichever is selected.
Switches and LEDs on Teacher Control
Remote
•
Student Selector (labeled 1-8)
Allows any combination of individual students,
paired students or grouped students to be selected
together. Any students selected to the selector row
can hear or communicate with the instructor. Any
selected students, whether individual students,
paired students or grouped students can hear each
others instruments and talk to each other.
•
Bank
Selects the bank of students that can be controlled.
•
CD INPUT
Selects the CD In.
•
AUX INPUT
Selects the Aux. In.
•
PAIRS
When selected, assigns all students to groups of 2
(1 & 2, 3 & 4, 5 & 6 etc.). One or more pairs of
students can be selected. Only selected pairs can
hear or communicate with the instructor. PAIRS
overrides GROUPS mode.
•
GROUPS
Students can be assigned to only one of four
GROUPS: A, B, C, or D. Students assigned to a
group can hear only members of their group unless
more than one group is selected. To assign a
student to a group, press and hold the desired
GROUPS button. While holding the GROUPS
button, press the buttons of the students you wish
to assign. An LED will illuminate for each
assignment. To unassign a student to a group,
while holding the desired GROUPS button, press
the buttons of the students you wish to unassign.
The associated LED will turn off.
To change a group assignment, press and hold the
new group’s Assign GROUPS button, then change
the student’s assignment by pressing the student’s
button. The illuminated LED will follow the new
assignment. To clear all settings including
GROUPS assignments, press the ALL and MUTE
buttons simultaneously.
•
BROADCAST
Routes the audio from any selected students, and
the teacher’s microphone if selected, to all
students.
•
MIC
Press to activate the teacher’s microphone.
•
All
All students can hear only the teacher’s instrument,
their own instrument, and teacher’s microphone
when selected. (The teacher will not hear student
instruments in this mode.) All overrides PAIRS and
GROUPS mode.
•
MUTE
This mutes all the student microphones on the
headsets.
Student Boxes
The Student Boxes connect the instruments to the Hub.
• Stereo Keyboard (cable with ¼” plug) connects to
the instrument’s headphone output jack.
•
To Hub connects the student box to the hub with
the supplied RJ-45 cables (8 conductor telephone
type cables).
•
From Computer Audio Out 1/8” jack used to send
line level audio from a computer or playback device
to the students headset.
•
To Computer Mic IN 1/8” jack used to send the
students performance to a computer or other line
level input recording device.
•
Inst. Level (L & R) sets the volume level of the
headsets, preset at factory and normally does not
need adjustment.
•
Phones & Mic connectors for headsets
Headsets
Connect the headsets to the student boxes by inserting
the green colored 1/8” connector into the “Phones” jack
and the pink colored 1/8” connector into the “Mic” jack on
the student box.
Please note: make sure the plugs are fully inserted into
the hole on the student box, if not fully inserted the sound
may be heard from one channel only or not heard at all
from headset.
Testing the Basic System
Once all the connections are made and the keyboards are
labelled for the teacher to identify the student number, it is
a good idea to check that the lab controller is receiving
audio from all the student keyboards and the students can
hear the teacher’s microphone and instrument. It will be
easier to have an assistant help you. Start at keyboard #1
then work through each student instrument connected to
the Lab system and check to verify the the LED will
illuminate corresponding to the correct student number,
then have the assistant wear the student headset, speak
into the student microphone then play the student
keyboard. Adjust the student volumes as necessary.
Activate the teacher’s microphone and speak. Play the
teacher’s keyboard. Verify that your assistant can hear
you speak and can hear you play. Adjust the teacher’s
volume controls as necessary.
Deselect the first student, and then select the next student
number to be checked and have your assistant move to
the corresponding unit, repeat the same procedures.
Connect a line level playback device to the “CD In” and
Aux. In, such as a CD player, computer or an MP3
playback device to test the input jacks. Select the lab
controller switch labeled CD/AUX INPUT. Play the CD or
sound source and adjust the control labeled TAPE/CD IN
for a comfortable listening level. Most CD players do not
have a volume control, but MP3 player or computers
usually can be adjusted on the source units.
Please note: the volume control labeled “CD/AUX INPUT”
affects the level of the CD INPUT and AUX INPUT.
Use the “Rec. Out” jacks (line level) to connect with inputs
on a recording device. Have the assistant play an
instrument and record the output of the Rec. Out to verify
that the outputs are working.
If the lab will be used with an external monitor, connect
the “Mon. Out” outputs of the Hub to an amplified sound
system and have your assistant play a unit and verify the
sound coming from the output is functioning normally.
Please note: if the teacher’s microphone is too close
to the monitoring system or if the teacher’s
microphone volume level is set too high, the system
may produce feedback; if this occurs, try to adjust
speaker direction slightly away from the teacher to
help avoid this problem.
Chapter 4
OPERATION OF THE CONTROLLER
The following section outlines the operational use of the
controller. The topics discussed are:
•
•
•
•
•
•
•
•
System Initialization
Important Controls And Switches
Practice Mode
Monitoring A Single Student
Monitoring Multiple Students
Demonstrations And Performances
Recording A Class Performance
External Monitoring
System Initialization
To return the lab controller to its factory default settings
press the ALL and MUTE buttons
.
Volume Controls
•
TEACHERS HEADPHONE
Use the volume control labeled TEACHERS
HEADPHONE to adjust the volume of the teacher’s
headphones.
•
TEACHER’S MIC
Use the volume control labeled TEACHERS MIC to
adjust the volume of the teacher’s microphone.
•
CD\AUX INPUT
Use the volume control labeled CD/AUX. INPUT to
adjust the volume of the device connected to CD In
or AUX In.
•
MIC
To allow the teacher to communicate with one or
more students, press the desired student selector
button(s), then press the teacher’s MIC button.
Switches and LEDs
•
All
To communicate with all students without hearing
their instruments, press the ALL button; activate
the teacher’s MIC button and begin speaking.
Students will hear only the teacher’s instrument,
their own instrument, and the teacher’s microphone
when ALL is selected. All overrides PAIRS and
GROUPS mode.
•
Student Selector (labeled 1-8)
Allows any combination of individual students,
paired students or grouped students to be selected
together. Any students selected to the selector row
can hear and communicate with the instructor. Any
selected students, whether individual students,
paired students or grouped students can hear each
others’ instruments and talk to each other.
•
Bank
Selects the bank of students that can be controlled.
•
CD INPUT
Selects the CD In.
•
AUX INPUT
Selects the Aux. In.
•
PAIRS
When selected, assigns all students to groups of 2
(1 & 2, 3 & 4, 5 & 6 etc.). One or more pairs of
students can be selected. Only selected pairs can
hear or communicate with the instructor. PAIRS
overrides GROUPS mode.
•
GROUPS
Students can be assigned to only one of four
GROUPS: A, B, C, or D. Students assigned to a
group can hear only members of their group unless
more than one group is selected. To assign a
student to a group, press and hold the desired
GROUPS button. While holding the GROUPS
button, press the buttons of the students you wish
to assign. An LED will illuminate for each
assignment. To unassign a student to a group,
press and hold the desired GROUPS button. While
holding the GROUPS button, press the buttons of
the students you wish to unassign. The
corresponding LED will turn off.
To change a group assignment, press and hold the
new group’s Assign GROUPS button, then change
the student’s assignment by pressing the student’s
button. The illuminated LED will follow the new
assignment. To clear all settings including
GROUPS assignments, press the ALL and MUTE
buttons simultaneously.
•
BROADCAST
Routes the audio from any selected students, and
the teacher’s microphone if selected, to all
students.
•
MIC
Press to activate the teacher’s microphone.
•
MUTE
Temporarily disables all student instruments.
Students’ microphones will remain active, but at a
reduced volume.
Practice Mode
The controller is initially set for Individual Student Practice
mode. Practice mode allows students to practice in
private. Students can only hear their own instrument and
cannot talk to each other. No LED’s on the student
selector are illuminated; PAIRS mode or GROUPS mode
is not active when the controller is in Individual Student
Practice mode.
To return the lab controller to its factory default settings
press the ALL and MUTE buttons. Any group assignments
will be erased.
It is also possible to have students practice in PAIRS or
GROUPS. These topics will be discussed later.
Monitoring a Single Student
To monitor a single student, press the button for that
student on the row of switches labeled 1 through 8. The
LED for that student will illuminate to indicate the
selection. To access the other banks of students, press
the BANK button.
The teacher can hear only the selected student’s
instrument and microphone. To communicate with the
student press the teacher’s MIC button and talk. Student
microphones are always active so they can respond
immediately. Other students can continue to practice in
private and cannot hear the conversation between the
teacher and selected student.
To monitor a different student, deselect the previous
student then select the new student to be monitored. The
appropriate LED’s will turn off or illuminate.
Monitoring Multiple Students
There are several ways to monitor and communicate with
more than one student.
Individual Selections
The simplest way to monitor more than one student is to
press the buttons for the students you wish to monitor
using the student selector buttons.
The LED’s will illuminate to indicate the selection.
Students who are selected can hear each other’s’
instruments and they can talk to each other.
To communicate with the selected students press the
teacher’s MIC button and talk. Students who are not
selected can continue to practice in private and cannot
hear the conversation between the teacher and selected
students.
PAIRS
It is possible to assign adjacent students to PAIRS for
practicing and monitoring.
To group the students into pairs, press the PAIRS button.
The PAIRS LED will illuminate to indicate selection.
Students are paired numerically starting at 1 & 2.
When PAIRS mode is activated, any previously selected
individual students are temporarily deselected clearing the
student selector row for a new choice. Students can now
practice in private pairs without any selection.
To return to the previous mode deselect PAIRS. Any
previous individual selections will be restored. Any
previous GROUPS selections will need to be reselected.
GROUPS
It is possible to assign students to GROUPS for
performing duets, trios, quartets or larger ensembles.
Students can be assigned to only one of four GROUPS:
A, B, C, or D. Students assigned to a group can only hear
each others instruments and talk to members of their own
group (practice mode) unless multiple GROUPS are
active.
To assign a student to a group, press and hold the
desired GROUPS button. While holding the GROUPS
button press the buttons of the students you wish to
assign. An LED will illuminate for each assignment.
To unassign a student from a group, press and hold the
desired GROUPS button. While holding the GROUPS
button, press the buttons of the students you wish to
unassign. The associated LED will turn off.
To change a group assignment, press and hold the new
group’s GROUPS button, then change the student’s
assignment by pressing the student’s button. The
illuminated LED will follow the new assignment.
To clear all group assignments, press the ALL and MUTE
buttons.
Group Communication
Once students have been assigned to a group, they can
be monitored and the instructor can talk to all members of
the group by activating group communication for that
group.
To activate group communication for a particular group,
press the GROUPS button for that group. The LED for the
selected group will illuminate and the individual students
assigned to the group will automatically be selected on
the student selector row.
Multiple GROUPS can be selected at one time to make a
larger group. Any GROUPS not selected using GROUPS
will be able to continue practicing in private.
To deselect any activated group, press the Group button
for that group. The LED will turn off and the individual
students will no longer be selected on the student selector
row.
STUDENT BROADCAST
Student BROADCAST allows an individual student, paired
students or group of students to perform for the rest of the
class. The instructor’s instrument may also be heard and
the instructor can talk to the students if the teacher’s MIC
button is activated.
Press the BROADCAST button. The BROADCAST LED
will illuminate. Any students selected to the student
selector row will be able to play for the rest of the class.
To stop the student BROADCAST and return to the
previous mode of operation, depress the BROADCAST
button. The LED will turn off and the previous settings will
be restored.
Performances from Tape or CD
Music from tape, CD, a computer or another external
audio source can be routed to the student’s headphones.
It is presumed that the playback equipment has already
been setup.
To play a piece of music from CD, first select the CD
INPUT button, then adjust the volume of the recording
using volume control labeled CD/AUX INPUT.
To play a piece of music from audio tape, the teacher’s
computer or another external audio source, first select the
AUX INPUT button, then adjust the volume of the
recording using volume control labeled CD/AUX INPUT.
The volume control labeled CD/AUX INPUT affects the
level of both the CD INPUT and AUX INPUT, whichever
one is selected.
Recording a Class Performance
To record a class or student performance, first select the
students to record by selecting them using the student
selector row. There is no adjustment on the Remote for
the audio going to a tape recorder or digital recorder.
Have the class rehearse the piece then adjust the record
level at the recorder. Start the recorder then have the
class members play their performance. Stop the recorder
when the performance is finished.
To listen to the recording, select the AUX. INPUT button,
rewind or cue the recording to the start of the
performance, start the recorded performance then adjust
the volume of the recording using the volume control
labeled CD/AUX INPUT.
External Monitoring
An external monitoring system may be connected for
students or others who wish to monitor the class but do
not have headsets connected to the system. Adjust the
audio level going to the external monitoring system using
the volume control labeled MONITOR.
Appendix A
SPECIFICATIONS
Input, Output and Interface Connections:
MON OUT
(2) RCA unbalanced Mono
REC OUT
(2) RCA unbalanced Mono
AUX IN
(2) RCA unbalanced Mono
TAPE IN
(2) RCA unbalanced Mono
Remote
RJ-45 (8 conductor telephone type)
Note: Do not use Cat 5 cable.
Teacher Interface
Box
RJ-45 (8 conductor telephone type)
Note: Do not use Cat 5 cable.
Student Interface
Box
RJ-45 (8 conductor telephone type)
Instrument
Single Stereo 1/4” phone or Single
Mono 1/4” phone or Dual 1/4” phone
Microphone
1/8” mini phone, condenser type
Headphone
Stereo 1/8” mini phone
Power
Requirements
9 Volts AC, 4 Amps
Note: Do not use Cat 5 cable.
Use Supplied AC Adapter only
Contact Information:
Kawai America Corporation
2055 E. University Dr.
Rancho Dominguez, CA 90220
800.421.2177 (press #1 for the service department)
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