7-10
Rev 2.2, 10/31/94
7.5 Tips and Techniques for Using the 601
Following are some tips and techniques for using the 601. You should consider any settings
given as starting points for developing your own settings. More general discussions of these
topics may also be found in Chapter 2 of this manual.
7.5.1 Recalling and Storing Settings
Recall any program by pressing the
L
EAVE
E
DIT
button, then using the Wheel to select the new
program, then pressing the
L
OAD
button. The new program has loaded when the display reads
donE
. The 601 always loads a copy of the program into the edit buffer (regardless of whether you
want to edit the program or not). The program in the edit buffer is also the program that the
601s processor executes, unless the
C
OMPARE
button has been pressed, in which case the 601
executes the program out of the program RAM/ROM.
When you modify the edit buffer by changing any parameter, the
S
AVE
switch flashes unless
the program memory has been write-protected (either by location or via the global parameter
block). If the
S
AVE
switch is flashing, the edit buffer is dirty; that is, its contents have changed.
The modified program can be stored in program numbers 1 through 128. If you try to save a
program to presets 129 through 256 (which are always protected) the display reads
Prt
,
indicating that the selected program number is protected (read-only). Chose a program number
between 1 through 128 for your program.
Store a modified program by pressing the
L
EAVE
E
DIT
button, then using the Wheel to select a
program number for the modified program (remember, between 1 and 128), then pressing and
holding the
S
AVE
button. The program has been saved when the display reads
donE
.
You can also store a modified program by pressing and holding the save button at any time.
When the display reads
donE
, the 601 reverts to whatever mode it was in when the save button
was pressed.
7.5.2 Metering
The 601 has two LED bargraphs that serve as input and output meters. In addition, the right-
hand bargraph does double duty as a gain-reduction meter whenever you are editing any of the
dynamics group. In gain-reduction mode, the meter indicates the change, from unity gain, for
the current function and the LEDs read (and move) from right to left. When operating as a level
meter, the LEDs read (and move) from left to right. Each mode has its own scale markings, as
shown on the front panel.
Both bargraphs are calibrated as headroom meters. This means that the scale of the meter is
referenced to digital clipping (full-scale), and in the case of the output bargraph, digital clipping
corresponds to clipping at the analog outputs. Both meters are peak
responding. Therefore, adjusting the output level for 2 dB of output
headroom sets the output level so that the highest
peak
signal level falls 2
dB below clipping or at +19 dBm (peak) at the balanced output. Now it
happens that the peak-to-average ratio for most music falls somewhere
between 10 and 20 dB (which means that the peak level ends up being 10 to
20 dB higher than the average, which is what you read on a VU meter). Thus the average level
could be anywhere between -1 dBm to +9 dBm (-5 to +5 VU) at the balanced output, depending
on the source material.
N
-4 -2
3
2 CLIP
-9 -6
-20 -12
6
18
12
4
-24
24
GAIN REDUCTION (dB)
OUTPUT HEADROOM (dB)
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