USER MANUAL
Optical Compressor
& Clean Boost
®
OB.1 - optical compressor & clean boost User Manual
Front Panel
BOOST LEVEL: Varies the
amount of boost when the
OUTPUT: Controls the overall
output level. Attenuation is
possible at low settings as
well as overall boost at higher
settings.
clean boost circuit is active.
TIP: Turn to maximum to
engage soft clipping.
®
COMP: Sets the threshold of the
optical compressor circuit. Set
below 50% for more transparent
settings and above 50% for more
sonically apparent compression.
Turning the COMP knob to zero
effectively takes the compressor
out of circuit.
OUT
9VDC
-
+
BOOST LEVEL
treble
mid
flat
Optical Compressor
& Clean Boost
IN
COMPOUTPUT
BOOST SHAPE:
Varies the frequency
response of the
clean boost circuit.
Treble boost, mid
boost and full
flat frequency
response curves
are provided. TIP:
Try the treble boost
BYPASSBOOST
with humbuckers
for biting solos or
the mid boost to add
girth to single coil
pickups.
®
BOOST FOOTSWITCH:
Engages the clean boost. The clean boost
is post compressor. TIP: to use the clean
boost without any compression turn the
COMP knob to zero to take the compressor
completely out of circuit
BYPASS FOOTSWITCH:
Engages and disengages effect. Bypass is
a true bypass circuit with mechanical relay
switching. LED on indicates that the effect
is engaged.
pg 2
OB.1 - optical compressor & clean boost User Manual
Rear & Bottom Panels
®
High impedance
mono input.
Low impedance
mono output.
Standard 9V DC center
negative power input.
Only 20mA available
current required.
The bottom plate can also be removed to access the battery
and internal DIP switch. The DIP switch can be set to alter the
frequency response of of the treble and mid boost functions. It’s
operation is explained on the next page.
pg 3
OB.1 - optical compressor & clean boost User Manual
In Depth: Boost EQ Curves & DIP switch configuration
®
DIP SWITCH: The internal DIP switch can be
accessed by removing the back cover of OB.1
and is located on the PCB near the output jack.
+20
treble boost frequency response
+15
+10
+5
dBr
+0
-5
-10
-15
-20
100 200 500 1k 2k 5k
Hz
Set SW1 to ON for a
lower treble boost
corner frequency.
Set SW1 to OFF for a
higher treble boost
corner frequency.
Set SW2 to ON for a
lower mid boost peak
frequency.
Set SW2 to OFF for a
higher mid boost peak
frequency.
+20
mid boost frequency response
+15
+10
+5
dBr
+0
-5
-10
-15
-20
100 200 500 1k 2k 5k
Hz
pg 4
OB.1 - optical compressor & clean boost User Manual
& Clean Boost
& Clean Boost
& Clean Boost
& Clean Boost
& Clean Boost
Sample Settings
®
COMPOUTPUT
BOOST LEVEL
treble
mid
flat
BOOST LEVEL
treble
mid
flat
BYPASSBOOST
Optical Compressor
Optical Compressor
Transparent Comp Vintage Squash
COMPOUTPUT
BOOST LEVEL
treble
mid
flat
BYPASSBOOST
BOOST LEVEL
treble
mid
flat
COMPOUTPUT
BYPASSBOOST
COMPOUTPUT
BYPASSBOOST
Optical Compressor
& Clean Boost
Optical Compressor
Treble Boost Single Coil Lead Boost
COMPOUTPUT
BOOST LEVEL
treble
mid
flat
BOOST LEVEL
treble
mid
flat
BYPASSBOOST
Optical Compressor
Optical Compressor
Drive the Front End Even it Out
COMPOUTPUT
BYPASSBOOST
pg 5
OB.1 - optical compressor & clean boost User Manual
Features
• Premium 100% analog signal path
• Classic optical compression circuit derived from vintage studio compressors
• Ultra low noise circuitry
• Clean boost with soft clipping
• 3 selectable boost EQ shapes
• 2 EQ curves per treble and mid boost selectable via an internal DIP switch
• Rugged & Lightweight Anodized Aluminum Chassis
• No-Nonsense User Interface
• True Bypass with low noise electromechanical relays
Specifications
Input Impedance 1Meg Ohm
Output Impedance 100 Ohm
Max Input Level +8dBu
Bypass Switching True Bypass (electromechanical relay switching)
Dimensions 4.5” deep x 4” wide x 1.75” tall
®
Power Supply
Input Voltage 9VDC Center Negative
Current Consumption < 20mA
pg 6
OB.1 - optical compressor & clean boost User Manual
Strymon Non-Transferrable Limited Warranty
Warranty
Strymon warrants the product to be free from defects in material and workmanship for a period of one (1) year
from the original date of purchase. If the product fails within the warranty period, Strymon will repair or, at our
discretion, replace the product at no cost to the original purchaser.
Exclusions
This warranty covers defects in manufacturing discovered while using this product as recommended by
Strymon. This warranty does not cover loss or theft, nor does the coverage extend to damage caused by
misuse, abuse, unauthorized modification, improper storage, lightning, or natural disasters.
Limits of Liability
In the case of malfunction, the purchaser’s sole recourse shall be repair or replacement, as described in the
preceding paragraphs. Strymon will not be held liable to any party for damages that result from the failure of
this product. Damages excluded include, but are not limited to, the following: lost profits, lost savings, damage
to other equipment, and incidental or consequential damages arising from the use, or inability to use this
product. In no event will Strymon be liable for more than the amount of the purchase price, not to exceed the
current retail price of the product. Strymon disclaims any other warranties, express or implied. By using the
product, the user accepts all terms herein.
®
How to Obtain Service Under this Warranty
For North American customers: Contact Strymon through our website at http://www.strymon.net/support for
Return Authorization and information. Proof of original ownership may be required in the form of a purchase
receipt.
For International Customers: Contact the Strymon dealer from which the product was purchased from in order
to arrange warranty repair service.
Strymon® is a division of Damage Control®, LLC.
REV A
pg 7
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