ครอส Bss fds336 ผมก็ฮัม เห็นบอกยี่ห้อนี้ต้องกลับสายสัญญาณ ผมกลับซะจนสายเละ ยังงมๆอยู่ ใครเชี่ยวชาญแนะนำด้วยคับ
น่าจะฮัมจาก Earth Loops ครับ
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สายสัญญาณ ต้องต่อตามคู่มือทุกเส้นครับ เหนื่อยหน่อย แต่หายจี่
จากคู่มือ 336
WARNING: THIS DEVICE MUST BE EARTHED!
A 3-wire earthed outlet must always be used.
The earth terminal of the IEC plug is required by wiring codes and regulations.
It must always be connected to the electrical installation safety earth.
The FDS-334T/336T has carefully designed internal earthing plus balanced Inputs and Outputs
to eliminate the possibility of earth loops (hum).
About earth loops
A typical example of an earth loop situation would be when two interconnected components of
a system are earthed through their individual AC power earth connections to separate AC poweroutlets.
In this case a path to ground exists both directly through the mains earth of each component
and also via the shield in the signal wire to the AC power earth connection of the other component.
In effect the two paths to earth form a loop antenna which picks up interference currents from surrounding equipment.
Because of lead resistance these induced currents are transformed into voltage fluctuations in the grounding system
and hence the reference ground is no longer at a stable potential.
Various connection configurations can prevent ground loops occurring.
The aim is always to ensure that a loop path is never actually formed.
The most flexible solution, and easiest to implement in a touring system,
is to use the practice of telescoping shields.
This method is highly effective in removing ground loops
and prevents unwanted signals entering the signal chain as the shield is always connected to ground at only one point.
The Minidrive is designed with the Input earth connections isolated so that an earth loop will
not occur between the FDS-334T/336T and the preceding source component.
However, an earth loop could occur between an Output connection from
the Minidrive and an amplifier with an input ground connection.
In this situation the signal cable shield can be disconnected at one end to prevent interference.
Rear Panel Connections12
Audio Connections
The FDS-334T/336T has two balanced Inputs and either six (336T) or four (334T) balanced
Outputs that can accommodate both balanced and unbalanced signals.
Note: Because the FDS-334T/336T outputs can be programmed for any passband,
caution must be taken when connecting the outputs to the amplifiers.
The connection of low frequency signals to high frequency drivers could cause serious damage - this is not covered by warranty.
Please check your wiring before using the Minidrive.
During the initial set up of the system turn the output volumes up slowly and listen for hums,
buzzes and crackling all of which could be down to faulty wiring and could damage your speakers and/or amplifiers.
Balanced wiring
High quality twin conductor shielded audio cables should always be used for all inputs and outputs.
The two Inputs are balanced female XLRs.
Input cable shields need to be derived from the signal source end
as pin 1 for the Inputs is isolated via a low value capacitor to provide high immunity from earth loops,
whilst ensuring good EMC performance.
Signal source Minidrive Input
The Outputs are balanced male XLRs, with pin 1 connected to ground.
Either pin 2 or pin 3 can be used as hot provided that both the Inputs and Outputs are wired to the same standard.
Minidrive Output Signal Destination Rear Panel Connections
