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Connections:

1. 

IN 

is the signal source input. 

2. 

THRU

 is a buffered output for the unprocessed signal split from the 

IN jack. 
3. 

SEND/RETURN 

is a series effects loop for external processing. 

The SEND out can also be used as an additional output.

4. 

OUT 

is the main output designed to connect the preamplifier to a 

power amplifier 

(RETURN or POWER AMP IN on combo amplifiers, 

INPUT on power amplifiers).  

5. 

AUX IN

 is an external audio input 

(the signal from the AUX IN is only 

heard through the PHONES output). 

6. 

PHONES

 is a headphones output. 

7. 

BALANCED OUT

 is a balanced output. 

8. 

POWER IN

 is a power supply input. The power requirements are 

12V DC 650mA. 
9. 

microSD

 is a microSD card slot. 

Controls:

10. 

GAIN

 controls input signal amplification. It can go from a 

crystal-clear sound all the way to a classic California-style overdrive. 
11. The 

BASS, MIDDLE 

and

 TREBLE

 knobs constitute a classic 

3-band passive EQ with a mild frequency correction effect and a 

characteristic mid scoop at 400 Hz. 
12. 

MASTER

 controls the volume of the signal coming from the OUT 

jack.
13. 

VOLUME

 controls the volume of the signal coming from the 

PHONES and BALANCED OUT jacks. 

The MASTER and VOLUME knobs work independently.

14. The 

TOP

 switch controls the signal’s high frequency harmonic 

content. The “+” position accentuates the highs and the attack. The ”-” 

position provides a milder sound by cutting the high frequencies. The 

neutral position does not affect the signal in any way. 

15. The 

GND

 switch allows to override “ground loops” that can 

negatively affect the signal when using XLR connections. In the lower 

position of the switch, the preamp’s “ground” is connected to the 

signal receiver’s “ground”. In the middle position, the “grounds” are 

disconnected. In the upper position, the “grounds” are connected and 

an additional filter is used to remove interference. 

The optimal setting of the GND switch is selected by ear: there should 

be a minimum amount of 50Hz hum and interference. 

16. The 

CAB

 switch selects one of the two built-in cabinet impulses: 

• 

The “A” position selects the impulse recorded from a SUNN 200s (2х

15) cabinet.  

• 

In the middle position, cabinet simulation is disengaged. 

• 

The “B” position selects the impulse recorded from an AMPEG 

SVT-810E (8х10) cabinet. 

When using a microSD card, impulses are loaded from the 

corresponding folder on the card. The CAB switch affects the signal 

from the BALANCED OUT and the PHONES OUT but does not affect 

the signal from the main OUT.

Loading impulses from a microSD card: 

Before using a microSD card, make sure it is formatted to the FAT32 

filesystem. 
When the memory card is used for the first time, a “Shift_IR” folder is 

automatically created on it. The folder contains two more folders (“A” 

and “B”, corresponding to the CAB switch positions) in which the 

default impulses are stored. To use external impulses, replace the 

default ones with your own files. The supported impulse format is 

24bit 48kHZ WAVE PCM1.
To restore the default impulse files, insert a blank microSD card into 

the device. This will create a “Shift_IR” folder containing the default 

files. If no card is inserted, the built-in impulses are used. 
 

www.shift-line.com/olympic

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