2 Technical Features Page 15
Standard pinout for the 6.3 mm TRS-jack:
Tip - Signal (+) | Ring - Signal (-) | Sleeve - Ground, Shield
Figure 2.8: TRS Jack
2.7 Ground Lift
The chassis ground of the amplifier is connected with the ground of the AC power cord (the non-fused
earthed protective conductor). Therefore, if several devices are connected in a signal chain a ground loop
may be created.This ground loop will cause a compensating current to travel on the shields of the audio
cables causing hum-problems.
The amplifiers series BASIC, XB and XR are equipped with a Ground Lift switch on the back side of the unit.
It has three settings:
Character Signification/Meaning
Signal ground (Audio) is seperated from chassis ground
Signal ground (Audio) is connected to chassis ground
Signal ground (Audio) is connected to chassis ground via a 10 ohms resistor
Setting 1 and 3 will remove hum in most cases.
Caution
Although Ground Lift is a common and proven method, proper cabeling and grounding should
avoid hum in the first place.
Isolating the ground of the AC power cord is technically different and eliminates the protective
earth connection. Therefore, NEVER isolate the ground of the AC power as this may pose a
serious danger to your life.
2.8 Loudspeaker Output Connectors
Use heavy gauge wire. It is advisable to use thicker cables to bridge greater distances between amplifier and
speakers. This will minimize power losses across the wire and improve the damping factor.
Please note: Wire thickness specifications (gauges) get larger as the wire gets thinner. So a 14-gauge wire is
thicker than 18-gauge wire.
c
2016 Bittner Audio Int. GmbH
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