Kustom KHS-6640 User manual

Six-Source Six-Zone
Music Distribution Amplifier
KHS6640 OWNE S MANUAL
SIX-ZONE AMPLIFICATION SYSTEM
MODEL KHS6640
ON
POWER
STANDBY
The KHS6640 is a si source, si zone music distribution amplifier that will fill your home
with the highest quality music of any system being built today. It offers unparalleled
features in a price range that is very affordable.
It features high quality 40 watt RMS Bi-Polar amplifiers per zone, with individual selection
and control of each source from each zone. Line outputs off of each zone easily allow
additional amplifiers or sub-woofer systems. With the 6640 you have independent IR
control of all of your audio sources from any room in the house. It also has an integrated
interface which allows for whole house paging in conjunction with your phone system,
and built-in front and back door chimes. A party mode allows you to select music source
and volume for all zones from one location. A built-in IR routing system allows you to
operate CD players, satellite receivers, or any other equipment independently even though
the same manufacturer makes them and they respond to the same IR codes. Your 6640
system may be controlled by the KHS6S, single gang controller, or the KHS6D dual gang,
programmable Controller for complete IR control of your audio equipment from any room
of your house.
Innovative, rugged and reliable, sleek and unobtrusive, the KHS6640 represents the
finest, uncompromising American engineering and design utilizing the highest quality
components and manufacturing available, all at a price you can live with. Kustom has a
quality reputation of over 30 years in the music and audio industries and this is an
e tension of that heritage.

THIS APPARATUS SHALL NOT BE EXPOSED TO
DRIPPING OR SPLASHING. NO OBJECTS FILLED
WITH LIQUIDS SUCH AS VASES SHALL BE PLACED
ON THE APPARATUS.
TO AVOID ELECTRICAL SHOCK, DO NOT
DISASSEMBLE. REFER SERVICING TO QUALIFIED
PERSONAL ONLY!
Kustom Inc., 4940 Delhi Pike, Cincinnati, OH  USA
( 00) 999-555 Fax: [phone] / www.kustom.com
SOUND LEVEL db FLOW RESPONSE
0
3
5
7
100
103
110
CAUTION
THIS AMPLIFIER HAS BEEN DESIGNED AND CONSTRUCTED TO PROVIDE
ADEQUATE POWER RESERVE FOR PLAYING MODERN MUSIC WHICH MAY
REQUIRE OCCASIONAL PEAK POWER. EXTENDED OPERATION AT
ABSOLUTE MAXIMUM POWER IS NOT RECOMMENDED SINCE THIS
COULD DAMAGE THE ASSOCIATED LOUDSPEAKER SYSTEM. PLEASE BE
AWARE THAT MAXIMUM POWER CAN BE OBTAINED WITH VERY LOW
SETTINGS OF THE MASTER VOLUME CONTROLS IF THE INPUT SIGNAL
IS VERY STRONG.
IMPORTANT
1. Read all safety and operating instructions before using this product.
2. All safety and operating instructions should be kept for future reference.
3. Obey all cautions in the operating instructions and on the back of the unit.
4. All operating instructions should be followed.
5. This product should not be used near water i.e. bathtub, sink, swimming
pool, wet basement, etc.
6. This product should be located so that its position does not interfere
with proper ventilation. It should not be placed flat against a wall or
placed in a built-in enclosure that will impede the flow of cooling air.
7. This product should not be placed near a source of heat, such as a
stove, radiator, or another heat producing amplifier.
8. Connect only to a power supply of the type indicated on the back of the
amplifier near the power supply cord.
. Do not break off the ground pin of the power supply cord.
10. Power supply cords should always handled carefully. Never walk or place
equipment on power supply cords. Periodically check cords for cuts or
signs of stress, especially at the point where the cord exits the unit.
11. The power supply cord should be unplugged when the unit is unused
for long periods of time.
12. If this product is to be mounted in an equipment rack, rear support
should be provided.
13. Metal parts and vinyl covering may be cleaned with a damp rag.
14. Care should be taken so that objects do not fall and liquids are not spilled
into the unit through the ventilation ports or any other openings.
15.This unit should be checked by a qualified service technician if:
A. The power supply cord or plug has been damaged.
B. Anything has fallen or been spilled into the unit.
C. The unit does not operate correctly.
D. The unit has been dropped or the enclosure damaged.
16. The user should not attempt to service this equipment. All service work
must be done by a qualified service technician for warranty repairs.
DANGER
EXPOSURE TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT
HEARING LOSS. INDIVIDUALS VARY CONSIDERABLY TO NOISE INDUCED HEARING
LOSS BUT NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOSED TO
SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME.
THE U.S. GOVERNMENT'S OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION
(OSHA) HAS SPECIFIED THE FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES:
ACCORDING TO OSHA, ANY EXPOSURE IN THE ABOVE PERMISSIBLE LIMITS COULD
RESULT IN SOME HEARING LOSS. EAR PLUGS OR PROTECTORS IN THE EAR CANAL
OR OVER THE EARS MUST BE WORN WHEN OPERATING THIS AMPLIFICATION
SYSTEM IN ORDER TO PREVENT A PERMANENT HEARING LOSS. IF EXPOSURE IN
EXCESS OF THE LIMITS AS PUT FORTH ABOVE, TO INSURE AGAINST POTENTIALLY
HARMFUL EXPOSURE TO HIGH SOUND PRESSURE LEVELS. IT IS RECOMMENDED
THAT ALL PERSONS EXPOSED TO EQUIPMENT CAPABLE OF INDUCING HIGH SOUND
PRESSURE LEVELS, SUCH AS THIS AMPLIFICATION SYSTEM, BE PROTECTED BY
HEARING PROTECTORS WHILE THIS UNIT IS IN OPERATION.
DURATION PER DAY IN HOURS
8
6
4
3
2
1
1/2 HR. or LESS
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE UNIT.
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF
UNINSULATED DANGEROUS VOLTAGE WITHIN THE PRODUCTS ENCLOSURE THAT
MAY BE OF SUFFICIENT MAGNITUDE TO CONSITUTE A RISK OF ELECTRIC SHOCK
TO PERSONS.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT
REMOVE CHASSIS. NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.

A.) Power Switch - Left on, the KHS6640, when not being used, will go into a sleep mode, ready
to turn back on when an input signal is applied from any of the si sources. In the off position, the unit
will not function.
B.) On LED - With the power switch on, this LED indicates that the unit is powered up and awake.
C.) Standby LED - This LED indicates that the unit is plugged into the wall.
D.) Output Section - This section is the output section. It provides the speaker terminals and line
outputs.
E.) Distribution Section - This section is the line level input/output section. It provides the inputs from
your sources and the outputs for stacking additional units.
F.) Controller Section - This section is where the wall controller in each zone connect. This section
includes the party mode master controller input.
G.) Paging/Control Voltage Section - This section is the paging and control voltage input and output
section. It provides the inputs from your phone system and door bells (front and back). It also has a
control voltage input and output for the unit controlling or being controlled by additional equipment.
H.) Infrared (I ) Section - This is the IR section. It provides outputs for the IR emitters.
I.) AC Power Cord - This is where the AC power cord connects to the unit. It is a detachable 3 prong
I.E.C. plug.
Page 1
GH IFED
120V 50/60Hz 300W
KUSTOM INC. CINCINNATI, OH
USA
MODEL KHS6640A
MULTI-ZONE
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
WARNING: SHOCK HAZARD - DO NOT OPEN.
IR REMOTE OUTPUTS
1
SOURCE OUTPUT
PAGE
AB
DOORBELL STATUS
SG +5v G +5v G
AUDIO
INPUT
SWITCH
INPUT
UNIT
ON
TRIG
ON
IN OUT
SOURCE 1
IN OUT
SOURCE 2
IN OUT
SOURCE 3
IN OUT
SOURCE 4
IN OUT
SOURCE 5
IN OUT
SOURCE 6
INPUT SOURCES ZONE CONTROLLERS
1 8
OUT
L
R
ZONE 1
L R
LEFT
- + RIGHT - +
ZONE 2
LR
LEFT
- + RIGHT - +
ZONE 3
LR
LEFT
- + RIGHT - +
ZONE 4
LR
LEFT
- + RIGHT - +
ZONE 5
LR
LEFT
- + RIGHT - +
ZONE 6
LR
LEFT
- + RIGHT - +
LINE OUT / SPEAKER OUT
20W/8 OHM X220W/8 OHM X220W/8 OHM X220W/8 OHM X220W/8 OHM X220W/8 OHM X2
LINE OUT LINE OUT LINE OUT LINE OUT LINE OUT LINE OUT
SUM OUTPUT
1 81 81 81 81 81 81 8
IN123456
MASTER INDIVIDUAL ZONES
A
2
B
3
C
4
D
A B C
SIX-ZONE AMPLIFICATION SYSTEM
MODEL KHS6640
ON
POWER
STANDBY

ZONE 1
L R
LEFT
- + RIGHT - +
ZONE 2
LR
LEFT
- + RIGHT - +
ZONE 3
LR
LEFT
- + RIGHT - +
ZONE 4
LR
LEFT
- + RIGHT - +
ZONE 5
LR
LEFT
- + RIGHT - +
ZONE 6
LR
LEFT
- + RIGHT - +
LINE OUT / SPEAKER OUT
20W/8 OHM X220W/8 OHM X220W/8 OHM X220W/8 OHM X220W/8 OHM X220W/8 OHM X2
LINE OUT LINE OUT LINE OUT LINE OUT LINE OUT LINE OUT
1.) Line Outputs (Left & ight) - These are dual RCA line outputs to go to additional amplifiers or
to powered sub-woofers. The white one is for left channel and the red one is for right channel. These
outputs will react to the volume controllers for each zone. Any changes made to these will follow
through to these outputs.
If you need additional speakers, say for a deck or large family room and require more power than
onboard, simply take these outputs and plug into the larger amp. If you want to run sub-woofers in
a zone, you can use powered sub-woofer systems or an additional amp to power them as in the above
e planation.
2.) Speaker Connectors - These connectors are where the speaker connections for each zone are
made. First determine which individual wire is ground (negative) and the other being the signal
(positive) of your speaker wire. The detachable speaker connectors are labeled as L- (left negative);
L+ (left positive); R- (right negative); R+ (right positive). There are small set screws on this connector
to allow solderless connections to be made. We suggest using a straight blade Jewelers screwdriver
to easily make this connection.
These speaker outputs are rated at 20 watts RMS a side into an 8 ohm load. Stay within that ohm
rating. This will be more than adequate power for most of the in-wall speakers on the market.
These connectors are then duplicated for the additional five zones and are identical in nature.
IN OUT
SOURCE 1
IN OUT
SOURCE 2
IN OUT
SOURCE 3
IN OUT
SOURCE 4
IN OUT
SOURCE 5
IN OUT
SOURCE 6
INPUT SOURCES
L
R
3.) Source #1 Left Input (White) - This RCA input will accept any standard line level source such
as CD, Receiver, Tuner, DSS, TV audio and more. It connects the left channel.
4.) Source #1 ight Input ( ed) - This RCA input will accept any standard line level source such
as CD, Receiver, Tuner, DSS, TV audio and more. It connects the right channel.
5.) Source #1 Left Output (White) - This RCA output will send a line level signal out, an e act copy
of that source signal, from the signal plugged into the left channel of source #1 inputs. It is used for
stacking additional KHS6640 units together. This provides an ultra clean audio distribution amplifier
for signal clarity.
6.) Source #1 ight Output ( ed) - This RCA output will send a line level signal out, an e act copy
of that source signal, from the signal plugged into the right channel of source #1 inputs.
These connectors are then duplicated for the additional five sources and are identical in nature.
OUTPUT SECTION
DIST IBUTION SECTION
1111111111111111111111111111111111111 2
34 56
Page 2

ZONE CONTROLLERS
1 8
OUT
1 81 81 81 81 81 81 8
IN123456
MASTER INDIVIDUAL ZONES
CONT OLLE SECTION
7.) Master Output - This connector allows the party mode to apply to multiple units if additional
units are added.
8.) Master Input - This is for the party mode controller. This controller should be located near the
unit and sources. It will override all zone controllers and select a source which will then play in all
zones. This mode is used for playing the same background music in all zones such as during a party.
The individual wall controllers still have the ability to select a different source after the party mode is
engaged. It uses a standard 8 pin RJ-45 connector.
9.) Individual Zone #1 Controller - This connector hooks up the wall controllers used in zone #1.
The signals from this wall controller control all the functions in zone #1. It uses a standard 8-pin RJ-
45 connector.
This connector is duplicated for the remaining 5 zones and function e actly the same.
PAGING/VOLTAGE CONT OL SECTION
10.) Audio Inputs - This is an audio sensing circuit and accepts the signal from an e ternal phone
system, or a pre-amplified microphone (i.e.: a mi er output), that has the capability of sending a page
signal from the master phone unit. The signal from this phone system will mute whatever source is
playing in all zones and allow the person speaking to page into all zones simultaneously. When the
signal is disengaged, the music will return to the previous level. Even zones that are not currently
on will open and allow the announcement to be made. Inside the unit is a master DIP type switch
which allow the installer to turn off the paging and doorbell override. This is especially suited for a
nursery. Pin 1 is for signal and pin 2 is for ground.
11.) Switch Inputs - This input is designed for older systems like intercoms that require a push to
talk latch mode contact before the audio signal can pass through. This is a hard bypass of the
audio sources. This can act as a whole house mute as well.
12.) Doorbell A Input - This input takes the signal from the contact closers from the front doorbell
transformer. When engaged, the source signal mutes and a distinctive chime (on board) plays through
the speakers. It will even play through zone speakers that arent on unless locked out.
13.) Doorbell B Input - Same as above but with a separate distinctive chime sound so you can
differentiate between the doors.
14.) Control Voltage Output - This output sends a constant 5 volt D.C. signal out to trigger ancillary
equipment when the unit is powered up. When the unit goes into the sleep mode, this voltage stops.
15.) Control Voltage In - This allows an e ternal sub system that sends a control voltage output to
this system to power up the unit from the sleep mode. This signal can be from 5 to 12 volts D.C.
The front panel power switch must be on for this to work.
789
Page 3
SG
10 11 12 13 14 15
PAGE
AB
DOORBELL STATUS
S G +5v G +5v G
AUDIO
INPUT
SWITCH
INPUT
UNIT
ON
TRIG
ON
SG

AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
WARNING: SHOCK HAZARD - DO NOT OPEN.
IR REMOTE OUTPUTS
1
SOURCE OUTPUT
SUM OUTPUT
A
2
B
3
C
4
D
INF A ED (I ) SECTION
16.) Source Output #1 through 4 - This 1/8 2 conductor jack is for the IR emitters and are locked
source specific. This is useful in for instance, if you have 2 or more of the same brand CD player,
since the same IR command will work on both, this ONLY sends the IR command to this particular
source. Nearly any brand of emitter will work. There are four source specific IR jacks.
This connector is duplicated for the remaining 3 outputs and function e actly the same as the first
one.
17.) Sum Output #1 through 4 - This 1/8 2 conductor jack is for the IR emitters and are summed
across the IR buss. This will allow normal operation of different components that dont share the same
IR commands. There are four sum output IR jacks.
This connector is duplicated for the remaining 3 outputs and function e actly the same as the first
one..
18.) A.C. Power - This is where the AC power cord connects to the unit. It is a detachable 3 prong
I.E.C. plug. Never remove the ground lug on the plug or electrical shock and damage to the unit could
result.
16
17
18
INSTALLATION NOTES
WIRING DIAGRAM FOR REMOTE ROOM CONTROLLERS
TO KHS6S/6D
DATA LINE C
DATA LINE B
DATA LINE A
+5 VOLT D.C.
GROUND
IR SIGNAL
CLONE
STANDBY
TO KHS6640
1
2
3
4
5
6
7
8
8
7
6
5
4
3
2
1
RJ-45
PLUG
RJ-45
PLUG
CLIP
CLIP
# Use Category 5 8-conductor cable. It is not necessary for it to be shielded but be careful with
your cable runs. Avoid running a tight parallel with A.C. wiring. Be careful if stapling the wire to secure
it in place.
# Use high quality RJ-45 connectors and make sure you use a high quality crimp tool. The crimp
of the RJ-45 connectors is crucial in making the system work properly.
# Avoid tight or sharp turns near the ends of the RJ-45 connections to the controller or main
units. This can put e cessive strain on already small wires.
# Note when stacking multiple units: Audio sources connect via the distribution outputs. Wall
controllers combine via the Master Controller Out jack. Make a short jumper and connect to the second
units Master Controller In jack to allow the party mode master controller to access all zones. For
the IR Emitters, we strongly suggest using a Y adapter for the emitters that attach directly from the
sources and then to the second units IR outputs. This allows the source specific functionality to be
utilized by the second KHS6640. An additional controller can be run per zone by using a RJ-45 Y
adapter before the main unit.
Page 4

KHS6640 INSTALLATION MANUAL

Page 1
KHS6640 Installation Manual
ecommended Cables:
Category-5 or Category-3 (4 twisted pair stranded), shielded or unshielded.
16-4 or (2) 16-2 speaker cables.
To keep the installation process as simple as possible for first time users, please follow these simple steps. These instructions
are written assuming that you are using the KHS6S controller. If you have the KHS6D controller, there are additional steps
involving teaching the controller IR commands.
Please refer to the KHS6640 Reference Manual for additional steps.
Section 1: Installation of Controller Cables and Speaker Cables.
1. Controllers should be located between wall studs. Locating controllers beside light switches is OK as long as the Cat-5
cable and AC wiring (rome ) are not bundled together and in their own bo . Each controller cable is home run between
each zone and the KHS6640 unit.
2. The ends of the Cat-5 cable are terminated with RJ-45 crimp on connectors (unkeyed). The proper wiring is the same
as standard phone company wiring: pin 1 to pin 8, pin 2 to pin 7, pin 3 to pin 6, pin 4 to pin 5,...etc. (see diagram below).
Cable testers are available from your local distributor.
3. Each speaker cable is also home run between each speaker and the KHS6640 unit. One pair of 6-8 ohm speakers per
zone is recommended. The speaker wires are attached to the 4-pin terminal blocks located in the back of the 6640 (these
are easily removable for ease of installation). Please observe proper polarity and left-right orientation.
4. All controllers and speakers can then be hooked up to their proper cables but not to the KHS6640 yet.
Section 2: Installation of the 6640 unit.
1. Place the 6640 in its permanent position in a rack or on a shelf. This unit generates large amounts of heat so please
remember to allow for adequate ventilation. The top clearance must be at least 1 inch (25mm).
2. Attach the AC power cord to the unit and plug the cord into the wall.
At this point the Power switch should be off. The Standby LED should be on but the On LED should be off.
3. Select which device will be source 1 and attach the audio outputs from it to the audio in terminals on the KHS6640 using
standard RCA cables. At this point place this source into play so that you will have audio to monitor.
4. Now attach the speaker connector for zone 1 to the KHS6640 (you decide which room will be which zone, and you should
write these assignments down for future reference).
5. Now press the Power button in to activate the KHS6640 (you should now see both the ON and the STANDBY LEDS
lit on the KHS6640).
6. Now attach the zone 1 controller to the zone 1 controller input on the KHS6640.
7. Now go to zone 1 controller. If the source 1 equipment is playing you should see two LEDs lit on the controller. The red
led that indicates the KHS6640 is powered up and 1 of 6 green LEDs that indicate which source is selected (if the green
LEDs are not lit, try pressing the mute button. This button mutes the source audio in this particular zone). Select the proper
source by pressing the corresponding button on the left of the controller. Press the volume up button to adjust the listening
level.
8. If you do not have sound, please review steps 1-7. If you do have audio please attach the remaining sources to the
KHS6640. If all sources are playing, you should now be able to select whichever source you want to listen to. A more detailed
description of controller operation is in the KHS6S operation manual.
9. Once you are comfortable with the operation of one zone you can proceed with wiring the other zones in the same way.
Section 3: Infrared epeater:
The KHS6640 has a built-in IR repeater system. This works by sensing any IR commands issued by an IR remote in any
zone and passing it through the Cat-5 cable and into the KHS6640 unit. From here it goes to the emitter outputs on the back
of the KHS6640. Any IR emitters plugged into the jacks will flash depending on which source is selected and which jack
that emitter is plugged into. The jacks labeled Source Outputs 1-4 will flash only when that particular source is selected.
The jacks labeled Sum Outputs A-D will flash when any source is selected.
1. Plug an emitter into Source 1 emitter out. Attach the flasher end to the face of the source equipment, making sure to
cover the IR sensor window.
2. You should now be able to select Source 1 on the keypad and, using that sources remote, control that source. Make
sure you point the remote at the rectangular IR window located at the top of the KHS6S.
*SPECIAL NOTE*
IR receivers in consumer electronics operate at different modulation frequencies. The most common is 38khz (kilohertz).
However, some satellite receivers operate at 56khz and some equipment operates at 32khz. Still other equipment is not
even compatible with this type of IR system. The KHS6640 will work with the majority of consumer audio/video equipment.
However, some models will not operate. It is up to the installer to determine compatibility.
WIRING DIAGRAM FOR REMOTE ROOM CONTROLLERS
TO KHS6S/6D
DATA LINE C
DATA LINE B
DATA LINE A
+5 VOLT D.C.
GROUND
IR SIGNAL
CLONE
STANDBY
TO KHS6640
1
2
3
4
5
6
7
8
8
7
6
5
4
3
2
1
RJ-45
PLUG
RJ-45
PLUG
CLIP
CLIP

Master In/Out:
The master controller input will accept a seventh KHS6S controller. This controller will then become a master control for
the entire system. If Source 1 is selected on this controller, all zones will switch to Source 1.
If volume up is pressed, all zones will go up and visa versa volume down will lower all zones. If mute is pressed, any zones
active will be muted.
The Master Out jack can be connected to the Master In on a second KHS6640 to allow master control of 2 units (12
zones).
Individual rooms then can override this and return to a local zone mode. This way individual zones can be changed to suit
the listener in a particular zone.
Unit On:
When the On LED is lit, there is a +5v DC applied to these pins that can be used to control any equipment such as relays
or digital switches. This voltage is switched off when the Power button is out or the KHS6640 is in the sleep mode such
as with no sources playing.
Trig On:
By applying +5v to +12v DC to these pins, the KHS6640 can be temporarily awakened. If no sources are present, the
KHS6640 will return to the sleep mode when the voltage is removed.
Using Multiple KHS6640 Units:
Up to 3 KHS6640 units may be wired together to provide 18 zones of listening pleasure. First connect all sources into the
first KHS6640 and use the Source Outs to connect to the Source Ins on the second unit. Then use the Source Outs on
the second unit to connect into the Source Ins on the third unit. Ne t, using Y-adapters (2-1/8 plugs to 1- 1/8 jack), connect
all emitter outputs of the KHS6640 to proper source emitters. Lastly, any connections made to page/doorbell status connectors
must also be made to the other KHS6640s.
Adding More Audio Power to the KHS6640:
If you need more audio power in a zone, simply attach an RCA cable in between the Line Out jacks and the inputs of an
e ternal power amplifier. This allows virtually unlimited volumes to be obtained. (Multiple outdoor speakers are a prime
e ample).
Section 4: Special Wiring Schemes:
The following connections are made to the KHS6640 via the 12 pin terminal block located on the back of the unit. Cat-5
wire or doorbell wire is perfectly suitable for all of these connections.
1. Page/ Doorbell Status:
Paging: The 6640 has two ways to allow e ternal paging to be amplified through it. The jacks labeled Audio Input will
accept any audio signal and will mute the sources and play the page audio automatically. The page sensitivity and level
are adjustable via trim pots located inside the KHS6640 (see fig. 1, page 3). Additionally, there are two pins labeled Mute
Input. When a DC voltage (+5v to +12v) is applied to these pins the source audio will mute and remain muted until the
voltage is dropped. Using an e ternal voltage for the page mute function will still allow an audio page to be amplified through
the system and may be advantageous when dealing with a noisy phone line (See diagram page 4).
Doorbell: The KHS6640 has two built-in and distinctly different doorbell sounds (ding and ding dong). Either doorbell can
be triggered by attaching wires from the houses doorbell transformer (switch side) to the terminals on the KHS6640 labeled
Doorbell A or B. Any voltage from 5v to 24v AC or DC will trigger the doorbell. This allows this feature to be used with
most types of e isting doorbells. Doorbell volume can be adjusted via a trim pot located inside the KHS6640 (see fig. 2,
page 3). The paging and doorbell features can be further customized in each zone. You can disable the page/doorbell
feature in a zone by setting both slide switches on that zone board to Off. This might be of use in a nursery, for instance.
You can set a zone to only mute the sources, but not play the page or doorbell by setting Switch to On, but setting audio
to Off. Finally, you could set Switch to Off and set Audio to On. This would allow the page or doorbell audio to mi
with the source audio (see fig. 3, page 3).
Telephone Entry Systems:
The KHS6640 is well suited to be integrated into a telephone entry system. With these systems you can page from any
phone in the house through the KHS6640 system. You can also trigger the doorbell or mute the system in some or all zones.
Please consult their owners manuals for operation. In the case of the Panasonic phone entry system using the KX-T30865
Doorphone, you must use the KHSPDA-1 to supply the necessary voltage to cause the 6640s internal doorbell to chime.
(See Pages 4 and 5 for the wiring diagrams of the most popular models.)
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