Source Audio SA170 Manuale utente
PROGRAMMABLE EQ
USER’S GUIDE
SA170
2 | Overview of Features
OVERVIEW
Thank you for purchasing the Source Audio Programmable EQ. The
Programmable EQ is a compact, 7-band digital equalizer with four user
preset locations. It uses high-precision processing combined with profes-
sional quality analog/digital converters for superior tone. The digital
nature of the unit offers a significant advantage over analog equalizers
in that presets can be easily saved and recalled. The MIDI input and Back-
page features further extend the capabilities of the unit.
• Flexible Range: +/- 18dB of range over 7 bands. An 8th band at 62Hz can
be edited using the Octave Extend Backpage function.
• Small Footprint: A compact, rugged, cast aluminum housing.
• State of the art DSP: 56-bit processing and crystal clear 24-bit
converters.
• Digital Flexibility: Presets can be quickly saved and restored.
All presets can be accessed via the footswitch.
• Hardwire “True” Bypass: hardwire bypass utilizes a small-signal relay
for improved reliability and remote switching capabilities.
• MIDI input: recall presets, engage/bypass remotely via MIDI.
Connections | 3
CONNECTIONS
1. Power
To power the unit, connect the included 9V battery or connect a Source
Audio 9V power supply to the 9V DC jack.
Note: Use of a non-Source Audio power supply may damage the unit and
void the warranty.
2. Guitar/Audio Connections
The unit has ¼-inch mono input and output jacks for use with guitar, bass,
and other instruments.
Note: The unit will not power up until a ¼-inch plug is inserted into the
input. Don’t forget to unplug the cable from the input when the unit is not
in use—otherwise the battery will continue to drain.
3. MIDI input
The Programmable EQ also features a MIDI (Musical Instrument Digital
Interface) input which allows certain functions of the pedal to be accessed
remotely. See the MIDI implementation table (page 6) for more details.
4 | Controls
CONTROLS
EQ Display: The heart of the Programmable EQ is the 7-band graphic
equalizer display. The LED display shows the currently active settings of
the equalizer within a range of +/-18 decibels (dB) for each of the seven
accessible bands. The left and right arrow buttons select the frequency
band to be adjusted and the main encoder knob adjusts the level of the
selected band up or down. The center frequency (in Hz) of each band is
indicated at the bottom of the display.
Band Select Buttons: The band select buttons flank the display and are
indicated by left and right arrows. Press a corresponding button to select
a higher or lower frequency to be edited.
Note: The equalizer can be quickly “zeroed” by pressing the left and right
arrow buttons simultaneously.
Encoder: The main knob on the unit is an encoder style control that
allows incremental up or down level changes to the selected frequency
band in 1dB steps. The maximum range is +18dB and the minimum is
-18dB for each frequency band.
SELECT Button: Pressing the select button will scroll through the
four user presets. The display will update to show the saved equalizer
curve and output for each preset location. Also, the four LEDs above
the SELECT button will indicate which of the four presets is currently
selected.
Controls | 5
SAVE Button: Once a preset has been selected, it can be edited. When any
of the controls are changed from their saved value, the preset LEDs will
begin to blink to indicating that the preset has been edited. To save the
new settings, press and hold the SAVE button for two seconds. The preset
LED will blink 3 times quickly when the saving process is complete.
OUTPUT: This small knob adjust the final output volume after the equal-
izer, it can be use to compensate the overall volume for any loss or gain
in the equalizer. The OUTPUT knob setting will be saved along with the
equalizer curve per preset. The OUTPUT knob is also illuminated by a
blue LED which will increase in brightness as the knob is turned up. This
way, the brightness of the OUTPUT knob will give some indication of the
output volume setting when scrolling through presets
ON/OFF Footswitch: Pressing and releasing the footswitch engages
or bypasses the unit. When engaged the ON/OFF LED will be lit. When
engaged the audio input will be routed through equalizer and the output
volume knob. When bypassed, the audio is routed through a hardwired
relay connection directly to the output. This is sometimes referred to as
“hardwire” or “true bypass.” There are no buffers or components between
the input and output in bypass.
The footswitch can also duplicate the function of the SELECT button.
Pressing and holding the footswitch will make the unit begin to scroll
through the four presets in the same manner as pressing the SELECT
button. Releasing the footswitch will stop the scrolling on the last se-
lected preset.
Note: If the unit is currently bypassed (OFF) the footswitch scroll function
will engage when the switch is released. If the scroll function is used
while the pedal is engaged, the unit will audibly step through the four
presets and remain engaged when the switch is released.
6 | MIDI Control
MIDI CONTROL
The Programmable EQ features a MIDI input that can be used to remotely
engage and bypass the unit as well as selecting presets. It also allows for
potential future firmware updates for feature changes or future interfac-
ing with a software editor.
MIDI Implementation Table:
The MIDI Channel is accessible as a Backpage parameter. See the next
section for details
Parameter Message Type Data Value
Enable Preset 1 Program Change 001
Enable Preset 2 Program Change 002
Enable Preset 3 Program Change 003
Enable Preset 4 Program Change 004
Disable Preset – Bypass Program Change 005
Parameter Message Type Data Value 1 Data Value2
Output Continuous Controller 030 0–127
Engage/Bypass Continuous Controller 031 <64 Bypass
>=64 Engage
BACKPAGE PARAMETERS
The Programmable EQ features an additional set of functions called
Backpage Parameters. These features can be accessed in Backpage
mode only. In this mode, the equalizer display takes on some secondary
functionality.
To enter Backpage mode, press the left arrow band select button and the
SAVE button simultaneously. The display will change to reflect the current
Backpage parameter settings. Like an equalizer band, use the left and
right buttons to select a column and use the encoder to change the value.
Backpage mode can be exited by pressing both save and left select but-
tons together again.
Backpage Parameters | 7
125 250 500 1K 2K 4K 8K
+18
-18
0
+18
-18
0
1 2 3 4
SAVE SELECT
OUTPUT
ON/OFF
(HOLD)
PRESET SELECT
62 125 250 500 1K 2K 4K
PROGRAMMABLE EQ
OE SW MCAS
BP
PRESS
PRESS
Backpage parameter labels
In Backpage mode, the first four columns of the display are used to edit
four different parameters. Each parameter is denoted by a two letter ab-
breviation. They are as follows:
OE – Octave Extension: This parameter allows an 8th band to be added
to the equalizer, the 8th band is at a frequency of 62 Hz, one octave below
the normal low of 125 Hz. This frequency is especially helpful for use with
bass. The lowest position on the display indicates this features is off. The
next LED position up from the bottom indicates the octave extension is
enabled. After exiting backpage mode, the 62 Hz band can be accessed by
pressing the left band select button until the 125 Hz column is selected.
Pressing the left button again will shift the display and allow the 62 Hz
band to be displayed and edited by the encoder. Press the right band
select button to resume the normal 7-band view.
SW – Switching speed: This parameter controls scrolling speed when
using the footswitch to scroll through presets or using the auto-scroll
mode (see below). The full range of the display is used for this parameter.
Slowest speed is at the bottom and fastest at the top.
8 | Backpage Parameters
125 250 500 1K 2K 4K 8K
+18
-18
0
+18
-18
0
1 2 3 4
SAVE SELECT
OUTPUT
ON/OFF
(HOLD)
PRESET SELECT
62 125 250 500 1K 2K 4K
PROGRAMMABLE EQ
OE
SW MCAS
125 250 500 1K 2K 4K 8K
+18
-18
0
+18
-18
0
1 2 3 4
SAVE SELECT
OUTPUT
ON/OFF
(HOLD)
PRESET SELECT
62 125 250 500 1K 2K 4K
PROGRAMMABLE EQ
OE
SW
MCAS
PRESS
Off Enabled
Slow
Fast
Backpage Parameters | 9
AS – Auto-Scroll: This parameter enables/disables the auto-scroll func-
tion. When in auto-scroll mode, the footswitch preset scroll will continue
to scroll automatically even after the footswitch is released. This can be
a fun way to get unique tremolo or sequencer sounds as the unit steps
through the four equalizer presets at a given programmable rate. The
rate of the scrolling is controlled by the switching speed (SW) parameter.
Auto-scrolling will stop when the footswitch is pressed again. Like the
OE function, this parameter uses the two bottom LEDs on the display to
indicate ON or OFF.
MC – MIDI Channel: Use this parameter to edit the MIDI channel for the
Programmable EQ. The display will numerically indicate the currently
selected channel from 1 to 16.
Note: Backpage parameters can be reset to factory default values by
pressing both band select left and right buttons simultaneously.
125 250 500 1K 2K 4K 8K
+18
-18
0
+18
-18
0
1 2 3 4
SAVE SELECT
OUTPUT
ON/OFF
(HOLD)
PRESET SELECT
62 125 250 500 1K 2K 4K
PROGRAMMABLE EQ
OE SW MCAS
BP
PRESSPRESS
125 250 500 1K 2K 4K 8K
+18
-18
0
+18
-18
0
1 2 3 4
SAVE SELECT
OUTPUT
ON/OFF
(HOLD)
PRESET SELECT
62 125 250 500 1K 2K 4K
PROGRAMMABLE EQ
OE SW MC
AS
Off
On
10 | Specifications
Dimensions
• L: 4.5 inches (11.4cm)
• W: 2.5 inches (6.4cm)
• H: 2 inches (5.1cm)
Weight
• .625 lbs (.28 kg)
Power
• 80mA @ 9V max
• Negative tip power jack
Audio Performance
• 115dB Dynamic Range ADC
• 24-bit audio conversion
• 56-bit digital processing
SPECIFICATIONS
If possible, dispose of the device at a recycling center. Do not
dispose of the device with the household waste.
For full compliance with EN 61000-4-6 standard, input cable must
be less than 3 meters in length.
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