Summit Audio 2BA-221 Mic and Line Preamplifier - Manual (Page 8)

Rear Panel
8 Summit Audio, Inc.
Insert
The insert jack allows you to insert a processing device, such
as a compressor, after the highpass filter and before the
vacuum tube stage. This jack can also be used as another
input or output. Refer to the block diagram on page 14.
Stacking Output
This is an unbalanced high level output taken just before the
vacuum tube input and insert. Connect the Stacking Output
to the Stacking Input of another 2BA-221 to add additional
input channels. See the diagram below. This jack can also be
used as an additional output
(phase inverted from input) .
Stacking Input
This is an unbalanced high level input which sums into the
2BA-221 just before the tube output stage and insert jack.
Signal Out
Signal Return
Tip Ring
To Input
of Processor
To Output
of Processor
INSERT CABLE
Signal is sent out on tip of plug and
returned via ring of plug.
2BA-221
When using the insert
jack, a cable wired like the
one shown above should
be used.
The diagram at right shows
one way to connect two
2BA-221 units to create a
4-input summing device.
The Hi-Z input on the front
panel could be used
instead of the rear panel
line-in jack if desired.
-10 BAL. INSERT
SUMMIT AUDIO INC. CARMEL, CA USA
MIC
FUSE
+4 BAL.
SUMMITAUDIO.COM
MODEL 2BA-221 20W MAX
OUTPUTS
OUT IN IN
STACK
INPUTS
-10 BAL. INSERT
SUMMIT AUDIO INC. CARMEL, CA USA
MIC
FUSE
+4 BAL.
SUMMITAUDIO.COM
MODEL 2BA-221 20W MAX
OUTPUTS
OUT IN IN
STACK
INPUTS
2BA-221
2BA-221
Output
2 Inputs
2 Inputs
From Stack Out
of another 2BA221