It will reduce the resistance of the return circuit a bit. Connecting the chassis ground in the ground in the trigger cable may have an effect. In the X3400H, perhaps for variety, it appears the trigger return circuit is connected to the analog video ground, which is ultimately connected to the chassis. The digital ground is connected to the analog ground at the AKM DAC (this is per the design of the AKM DAC IC) so that sets up a potential source for a ground loop and hum depending on the circuitry at the receiving end of the trigger circuit the other piece of equipment. In some D/M equipment the return is connected to the digital ground. Issues with ground loops and hum due to trigger circuits are thus seemingly random. Not returning the ground to the source sets up a situation were a ground loop may be occur depending on the trigger receiving circuit in the other piece of equipment. The few Yamaha AVR's I've examined use this type of connection.ĭenon/Marantz runs the + supply to the trigger as an isolated circuit, but then typically dumps the ground/return into a convenient location, and does not return it to the source. This design keeps any issues from the trigger circuit away from other circuits such as analog audio. That is a + and ground/return, two continuous, isolated connections all the way. Ideally the circuit would run from the source of the supply to the trigger jack and then back to the source. The trigger circuit has its own power supply in most AVR's/AVP's.
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