Radial Engineering Twin-City Bruksanvisning
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                    Twin-City
                
                                
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CONGRATULATIONS on your purchase of the Twin-City AB/Y amp 
switcher™. The Twin-City is an active switcher that enables you to connect 
two amps and switch between them, or drive them both simultaneously 
without degrading your natural guitar tone in any way. In our view, changing 
the tone of a ’57 Strat is not an option! 
The Twin-City buffer lowers the output impedance and susceptibility to in-
terference allowing you to drive long cables without tone loss or noise. Drag 
Control™ is a recessed “set-and-forget” control that lets you compensate 
for cable signal loss and introduce the perfect load to replicate the way 
your guitar’s pickups naturally interact with your amp. Advanced Electronic 
Impulse Switching (EIS) is 100% noiseless and free from popping noises 
produced by mechanical switches. 
To eliminate ground loops that cause hum and buzz, the Twin-City is 
equipped with an isolation transformer on OUT-B. This output is further 
augmented with a ground lift switch and 180º polarity reverse switch that 
ensures both amplifi ers play in phase while noise is reduced to an absolute 
minimum, even when using older amps that are prone to noise. 
Bright, easy to see LEDs deliver on-stage switching cues so you know ex-
actly what your amp status is at all times. The Twin-City is a powerful ABY 
switcher that delivers all of the natural tone, punch and clarity without the 
inducing noise of any kind.
THE TWIN-CITY 
Requires an external power adapter that outputs 9 to 12 volts DC with a 
2.1mm barrel jack wired center pin negative 
. The Twin-City will 
draw a max of 100mA. Possible damage may occur if another type of power 
adapter is used. Consult your dealer for more information.
CONNECTIONS AND SETUP
Before you begin, turn your guitar amplifi ers OFF. Connect the power supply 
adaptor. An LED illuminates indicating the pedal is powered up and ready 
for use.
Connect your guitar to the IN jack.
Connect OUT-A to your “A” amplifi er.
Connect OUT-B to your “B” amplifi er. 
Always test your connections with your amps 
set at a low volume level. Turn your amps 
on. If no sound is heard check the guitar and 
power connections. 
Activate amp-A by depressing the TOGGLE 
footswitch (LED A on). Adjust your amp to a 
comfortable volume for playing. Depress the 
TOGGLE footswitch again and set up amp-B.
Next, perform a polarity test to ensure the 
loudspeakers in both amps are moving in 
the same direction. With both amps active 
and set to equal volume, fl ip the 180° switch 
to adjust the polarity of OUT-B. Listen to the 
sound at both positions and choose the one 
that sounds the fullest. 
Finally, if you notice hum or buzz, try lifting the ground by sliding the LIFT switch. 
Use the position that produces the least noise and you’re ready to rock.
CONGRATULATIONS on your purchase of the Twin-City AB/Y amp 
switcher™. The Twin-City is an active switcher that enables you to connect 
two amps and switch between them, or drive them both simultaneously 
without degrading your natural guitar tone in any way. In our view, changing 
the tone of a ’57 Strat is not an option! 
The Twin-City buffer lowers the output impedance and susceptibility to in-
terference allowing you to drive long cables without tone loss or noise. Drag 
Control™ is a recessed “set-and-forget” control that lets you compensate for 
cable signal loss and introduce the perfect load to replicate the way your gui-
tar’s pickups naturally interact with your amp. Advanced Electronic Impulse 
Switching (EIS) is 100% noiseless and free from popping noises produced 
by mechanical switches. 
To eliminate ground loops that cause hum and buzz, the Twin-City is 
equipped with an isolation transformer on OUT-B. This output is further 
augmented with a ground lift switch and 180º polarity reverse switch that 
ensures both amplifi ers play in phase while noise is reduced to an absolute 
minimum, even when using older amps that are prone to noise. 
Bright, easy to see LEDs deliver on-stage switching cues so you know ex-
actly what your amp status is at all times. The Twin-City is a powerful ABY 
switcher that delivers all of the natural tone, punch and clarity without the 
inducing noise of any kind.
THE TWIN-CITY 
Requires an external power adapter that outputs 9 to 12 volts DC with a 
2.1mm barrel jack wired center pin negative 
. The Twin-City will 
draw a max of 100mA. Possible damage may occur if another type of power 
adapter is used. Consult your dealer for more information.
CONNECTIONS AND SETUP
Before you begin, turn your guitar amplifi ers OFF. Connect the power supply 
adaptor. An LED illuminates indicating the pedal is powered up and ready 
for use.
Connect your guitar to the IN jack.
Connect OUT-A to your “A” amplifi er.
Connect OUT-B to your “B” amplifi er. 
Always test your connections with your amps 
set at a low volume level. Turn your amps 
on. If no sound is heard check the guitar and 
power connections. 
Activate amp-A by depressing the TOGGLE 
footswitch (LED A on). Adjust your amp to a 
comfortable volume for playing. Depress the 
TOGGLE footswitch again and set up amp-B.
Next, perform a polarity test to ensure the 
loudspeakers in both amps are moving in 
the same direction. With both amps active 
and set to equal volume, fl ip the 180° switch 
to adjust the polarity of OUT-B. Listen to the 
sound at both positions and choose the one 
that sounds the fullest. 
Finally, if you notice hum or buzz, try lifting the ground by sliding the LIFT switch. 
Use the position that produces the least noise and you’re ready to rock.
True to the Music
True to the Music
TWIN-CITY AB/Y
OWNER’S MANUAL
TWIN-CITY AB/Y
OWNER’S MANUAL
Radial Engineering Ltd.
Radial Engineering Ltd.
Twin-City AB/Y
Twin-City AB/Y
FEATURES AND FUNCTIONS
1. IN: 1/4" input jack for your guitar.
2.  DRAG
™
: Reintroduces the natural loading that occurs 
between your amplifi er and the guitars pickups. Start 
with DRAG set to 12 o’clock. Use your guitar pick like 
a screwdriver to move the control until it sounds right to you. 
3.  OUT-A: 1/4” jack connects to amp-A. For safe operation always connect 
to a properly grounded guitar amp equipped with a 3-prong A/C power 
cord. See the warning on the other side of this manual.
4.  OUT-B: 1/4” jack connects to amp-B. This output is transformer isolated 
to eliminate hum and buzz caused by ground loops.
5.  PSU: Connection for 9-12 volt DC (center pin negative  ).
6.  A/B STATUS LED: Two LED status indicators display the active amp while 
in single output mode. 
7. TOGGLE: Footswitch selects between amp-A or amp-B while operating 
in single-amp mode. 
8.  BOTH: Footswitch activates both amps. An LED status indicator illuminates 
when dual-amp mode is active.
9. LIFT: Disconnects ground at OUT-B to further reduce noise.
10. 180°: Polarity reverse switch inverts the signal phase of OUT-B to ensure 
amps are in-phase and their speakers are moving in the same direction.
FEATURES AND FUNCTIONS
1. IN: 1/4" input jack for your guitar.
2.  DRAG
™
: Reintroduces the natural loading that occurs 
between  your  amplifi er and  the  guitars  pickups.  Start 
with DRAG set to 12 o’clock. Use your guitar pick like a 
screwdriver to move the control until it sounds right to you. 
3.  OUT-A: 1/4” jack connects to amp-A. For safe operation always connect 
to a properly grounded guitar amp equipped with a 3-prong A/C power 
cord. See the warning on the other side of this manual.
4.  OUT-B: 1/4” jack connects to amp-B. This output is transformer isolated 
to eliminate hum and buzz caused by ground loops.
5.  PSU: Connection for 9-12 volt DC (center pin negative  ).
6.  A/B STATUS LED: Two LED status indicators display the active amp while 
in single output mode. 
7. TOGGLE: Footswitch selects between amp-A or amp-B while operating 
in single-amp mode. 
8.  BOTH: Footswitch activates both amps. An LED status indicator illuminates 
when dual-amp mode is active.
9. LIFT: Disconnects ground at OUT-B to further reduce noise.
10. 180°: Polarity reverse switch inverts the signal phase of OUT-B to ensure 
amps are in-phase and their speakers are moving in the same direction.
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Produktspecifikationer
| Varumärke: | Radial Engineering | 
| Kategori: | Inte kategoriserad | 
| Modell: | Twin-City | 
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