Atma-Sphere S-30 Mk. 3.2
amplifier setup and operation
Installation
Place the amps in your system. Connect the preamp cables to the appropriate input connectors on the front of the amp. If you use
the RCA input connectors, make sure shorting jumpers are installed between pins 1 & 3 on the XLR connectors else a buzz may
result. Verify that both power switches are OFF and connect AC power to the AC input connector on the rear of the amp. Connect
the negative speaker cables to the negative output terminals and the positive speaker cables to the positive output terminals.
Setup
Install the tubes in their sockets. The middle 6 sockets take the 6SN7 driver tubes. All other sockets take the 6AS7G output tube. A
total compliment of six driver and ten output tubes are required. Engage the Main Power switch (left side of chassis) and verify that
the amber indicator lights. In about 15 seconds, the filaments of all tubes should be visibly glowing orange. Wait at least one
minute, then engage the Standby switch (right side of chassis) and verify that the red indicator lights. The amplifier is now fully
powered up.
DC Offset adjustment/Meter Switch
Move the Meter switch (middle of chassis) to the left. Examine the reading on the VU meter. If NOT all the way to the left, adjust
the left control to bring the meter to the lowest reading. Perform the same operation for the right channel, using the right hand
control. Return the switch to the center position. The amplifier is now ready to operate.
Operation
The amplifier can be left in either standby or operational mode indefinitely. If using less than 8 ohm speakers, we recommend the
ZERO accessory (see your dealer for details) to allow the amplifier to accommodate the impedance. The amp will give its best
performance on 16 ohm speakers. If using an 8 ohm speaker, it is very important the speaker exhibit at least an 8 ohm
impedance at all frequencies. In any event, the speaker load should be one known to be easy to drive. Speaker cables can have a
rather dramatic effect and you are invited to experiment.
The middle position of the Meter switch reads both channels at once. The scale is relative; full scale is roughly 30 watts
but due to signal differences between left and right the meter may read higher than actual power. Full scale is 1 watt on the other
switch positions.
Fuses
The closest fuse to the AC connector supplies power to the amplifier's output section, and is 5 Amp on 117 Volt models, 2.5 amps
on 235V. If the amp lights up but otherwise appears to be dead, check this fuse.
The middle fuse supplies power to the output tube filaments, and is 5 Amp on 117 Volt models, 2.5 amps on 235V. The
third fuse supplies power to the driver supply and is 0.5 Amp on 117 Volt models, .25 amps on 235V. Failure of this fuse
indicates service of the amplifier chassis is required.
ROHS
© 2012 Atma-Sphere Music Systems Inc
1742 Selby Ave.
St. Paul, MN 55104
651-690-2246
