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Kustom 6640 FAQs

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Can I control volume and source selection with a wireless remote?

Yes, the KHS6S and the KHS6D keypad controllers have a built-in IR emitter that will teach any learning remote the Kustom IR codes for volume, source selection, and mute.

How do I control IR if I am using more than one 6640 amplifier?

The best solution is to use “Y” cords with two 1/8" male ends going to a 1/8" female end. This works with the 4 source outputs as well as the 4 summed outputs.

Can I use more than one keypad within a single zone?

Yes, the keypads can be tied together via a Cat-5 “Y” cord or an RJ-45 Y adapter. We suggest using only two keypads within one zone. It is also possible to control two zones with one keypad.

Can I use more than one pair of speakers within a single zone?

The 6640 is intended to be sued with two 8 ohm speakers per zone. It is equipped with line level preamp outs for each zone. You can line out to any external amplifier using standard RCA cables. This makes it possible to power additional speakers, or a powered subwoofer for surround sound systems.

Do I have to have all zones playing music to be able to hear the doorbell and page?

No, the page and doorbell features will work regardless of the status of the zones. You can, however, use internal switches on each zone to defeat the doorbell and page, or allow the doorbell and page without muting the system.

Do I need to have a backup for the memory in case of a power outage?

No, the KHS6D keypad has a non-volatile memory that will retain its memory once the keypad has been programmed.

How do I utilize the doorbell and page features?

The doorbell and page can be wired with simple two-conductor doorbell wire or standard twisted pair wire such as Cat-5 or Cat-3. The doorbell can be lined off of the existing doorbell transformer, or from the doorbell strike on the phone system. Since this feature utilizes a voltage to trigger an internal closure, a 9-volt battery will trigger the doorbell chimes. The page function can be used in two different ways. The simplest method is to take the audio line out from your phone system directly to the audio input on the 6640. The 6640 is designed to sense the incoming signal and mute the system until a signal is no longer present, at which point it will return to normal operation. It may be necessary to adjust the sensitivity on the page/doorbell board of the 6640 to compensate for additional noise in the phone system. A second method is to add a second power supply (this can be a typical “wall wart”) to one of the contact relays on the phone system and from there to the mute input on the 6640. This will mute the system regardless on incoming audio signal, and will remain muted until the phone is hung up.

My system is hooked up, but nothing lights up on the keypads.

It could be that the “POWER” button is not depressed on the KHS6640. Next verify that you have a source plugged in and playing. Remember that the 6640 will go into stanby mode after approximately 2 minutes if no incoming audio signal is detected. If both of these conditions have been met then you probably have an incorrectly wired Cat-5 cable. The correct pin assignment from end to end is: 1 to 8, 2 to 7, 3 to 6, 4 to 5, 6 to 3, 7 to 2, and 8 to 1. Note that the pin assignment is reversed from one end to the other, colored for the wiring is not relevant to system’s operation.

What does it mean if the red “power” LED is lit on the keypad, but none of the source LED’s is lit?

This condition indicates that the controller is “muted”. Press the “MUTE” button to turn off the mute in that zone at which point one of the source LED’s should light. If this does not solve the problem, and you are using the paging and or doorbell connections on the back of the KHS6640, disconnect these. If the page audio inputs are causing the muting then try adjusting the page sensitivity pot in the inside of the 6640 (see owner’s manual). Sometimes it is necessary to “reset” the 6D keypad by pressing the “reset” button on the keypad.

When I am installing the KHS6D keypad, do I have to program each one individually?

No. The 6D are equipped with a unique cloning feature. Once you have programmed one keypad, you then press the “clone RX” button. Then press the “clone TX” button on the programmed keypad. DO NOT perform this function with the keypads installed in their permanent location throughout the house. The cloning must be done using shorter (3-6 ft.) sections of Cat-5 wire at the 6640 unit. This can be done either in the home or in the installer’s workshop. Another important point is to eliminate any possible IR or sunlight interference from the cloning process. This includes pressing any buttons on the keypads during the 5-8 minute process. The keypads should be left completely alone during cloning and only when the LED’s in the center portion of the keypads have gone dark should anything further be done with any of the keypads. Once programmed, the keypads can then be installed in the home.

Once I have programmed my KHS6D keypad, why does some of the source equipment not work?

It is possible that the KHS6D did not store the commands properly. A good test for this is to aim the source remote at the keypad and try issuing commands. If they work through the keypad’s IR sensor, than the problem is not in the IR repeater and is probably in the programming of the keypad. One option is to simply reprogram the functions that are not working properly. If the keypad continues to be sporadic in functionality, you may need to clone a non-programmed keypad to the problematic keypad. This will restore it to pristine factory condition. In some cases it may be necessary to adjust the IR frequency internally in the KHS6640 amplifier unit. Consult the owner’s manual for a full description of this procedure.

I am not using the page or doorbell functions of the 6640, but my system has a tendency to mute.

The 6640 amplifier is equipped with a sensitivity adjustment for the page mute function. It is located on the page/doorbell board inside the unit (see the owner’s manual pg. 9). This trim pot could be set sensitive enough that external noise is triggering the audio sensing circuit. This can be remedied by turning the sensitivity pot completely counter clockwise. An external solution is to place a short wire jumper across the “AUDIO INPUT“ signal and ground on the 12-pin input located on the back of the unit, thereby disabling the audio sensing circuit of the 6640 amplifier.

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