Buzz Audio ma-2.2stereo microphone preamp - Manual (Page 6)

5
Controls and Indicators
continued…
• PWR … ON
We recommend that your MA 2.2 remains powered whilst in regular
use to maintain it’s excellent sonic performance. If you need to turn
it off, this switch will do it. Down is ON by the way and the cool
blue LED should light up. The audio outputs are automatically
MUTED during power up and power down.
•
SIGNAL GROUND.
This rocker switch on the rear panel selects HARD or SOFT internal
signal grounding. In the HARD position, the MA 2.2 Signal Ground
(common) is connected directly to the mains earth and MA 2.2
chassis. In the SOFT position, the Signal Ground is lifted from the
mains earth via a 10 ohm resistor.
Normally the Signal Ground switch should be set to HARD. If you
experience problems with “hum” when connecting the MA 2.2 to
other devices, try the SOFT position.
•
Please Note…
The mains earth to MA 2.2 chassis connection is unaffected by this
switch. Also, the Chassis Ground connection on the output
connectors is unaffected by this switch. Also see the Connections
section of this manual.
FOR SAFETY REASONS THE MA 2.2 SHOULD
ALWAYS BE EARTHED.
RESIST THE TEMPTATION TO REMOVE THE
EARTH TO GET RID OF HUM.
FIX IT ELSEWHERE IN THE SYSTEM.
MA 2.2 USERS MANUAL VERSION-1 PAGE 5