Radial Engineering Twin-City Manual

Radial Engineering Ikke kategoriseret Twin-City

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Side 1/2

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.

True to the Music

TWIN-CITY AB/Y

OWNER’S MANUAL

Radial Engineering Ltd.

Twin-City AB/Y

FEATURES AND FUNCTIONS

1. : 1/4" input jack for your guitar.IN

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. : Connection for 9-12 volt DC (center pin negative ).PSU

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. : Disconnects ground at OUT-B to further reduce noise. LIFT

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.

FREQUENTLY ASKED QUESTIONS

What is Drag Control™?

Drag Control is a unique proprietary load correction circuit that we employ inside select Radial products to emulate the

same input impedance and capacitance of a typical amp. When a guitar is connected directly to an ampliﬁ er, the two

devices interact as part of a closed circuit. When an active buffer is placed in between they can sometimes sound bright

or sterile. Drag Control counters this effect by reintroducing the load as if you were connected directly to your amp.

What does the 180° polarity switch for OUT-B do?

The 180º polarity reverse allows you to correctly line up the phase of the ampliﬁ ers that you are using. If the amps are

out of phase, the speaker cone(s) on one amp will be pushing out while the other amp will be pulling in. This causes the

sound to cancel out when both amps are active and reduces the lows end producing a hollow sound. It’s a good idea to

set both amps at an equal volume and test the system with the 180° switch in both positions.

Can I use a tuner with the Twin-City instead of a second amp?

Yes. Connect your amp to OUT-A and your tuner to OUT-B. By depressing the TOGGLE footswitch you can switch to

“silent” tuning mode. Depressing the BOTH footswitch will allow your tuner to see signal all the time for tuning on the ﬂ y.

Can the Twin-City be used to switch between 2 guitars instead of 2 ampliﬁ ers?

No. Because it is an active buffered pedal, signal will ﬂ ow one way, from input to output. You could however use the

Radial BigShot i/o™.

Can the Twin-City switch between input channels on my ampliﬁ er?

Yes. This lets you use one channel for rhythm and the other for lead.

Why can’t the Twin-City be powered by a battery?

It’s because of the class-A topology. Class-A circuits sound best but are power hungry and will drain a battery in no time.

The Twin-City requires a 9-12 volts DC adapter with a 2.1mm barrel plug wired center pin negative. It will draw 100mA of

current to operate. Your adapter can be rated higher, for example 500mA, but not lower.

I hear a high frequency “whine”. What causes this and how do I get rid of it?

Most likely this is caused by the power adapter you are using. Some switching type power adapters can make noise that

bleeds into the guitar signal. If you encounter high frequency noise try a different adapter. We recommend standard linear

adapters although we have successfully tested the Twin-City with both types.

www.radialeng.com

#1165 - 1845 Kingsway Ave, Port Coquitlam BC V3C 1S9

Tel: 604-942-1001 • Fax: 604-942-1010 • email: info@radialeng.com

RADIAL LIMITED THREE YEAR TRANSFERABLE WARRANTY

Radial Engineering Ltd. warrants this product to be free from defects in material and workmanship and will remedy any such

defects free of charge according to the terms of this warranty. Radial Engineering will repair or replace at its option any defec-

tive component(s) of this product, excluding the ﬁ nish, the footswitch (footswitches are warranted for 90 days) and wear and

tear from normal use, for a period of three (3) years from the original date of purchase. In the event that a particular product

is no longer available, Radial Engineering reserves the right to replace the product with a similar product of equal or greater

value. In the unlikely event that a defect is uncovered, please call 1-800-942-1001 or email service@radialeng.com to obtain

an RA number (Return Authorization number) before the 3 year warranty period expires. Once you have obtained an RA

number you must return the product, freight prepaid, within ﬁ fteen (15) days after the date the RA number is issued. To make

a request or claim under this limited warranty, the product must be returned prepaid in the original shipping container (or

equivalent) to Radial Engineering or to an authorized repair centre and you must assume the risk of loss or damage. A copy

of the original invoice showing date of purchase and the dealer name must accompany any request for work to be performed

under this limited warranty. This limited warranty shall not apply if the product has been damaged due to abuse, misuse,

misapplication, accident or as a result of service or modiﬁ cation by any other than an authorized repair centre.

THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE HEREOF AND DESCRIBED ABOVE.

NO WARRANTIES WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRAN-

TIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPEC-

TIVE WARRANTY PERIOD DESCRIBED ABOVE OF THREE YEARS. RADIAL ENGINEERING SHALL NOT BE RESPON-

SIBLE OR LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM THE

USE OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER

RIGHTS, WHICH MAY VARY DEPENDING ON WHERE YOU LIVE AND WHERE THE PRODUCT WAS PURCHASED.

DECLARATION

OF CONFORMITY

Radial Engineering Ltd. declares that

this product conforms to the following

speciﬁ cations:

Safety: IEC 60065 (1998), EMC: EN

55013 (1990), EN 55020 (1991)

Supplementary information: The

product herewith complies with the

requirements of the Low Voltage Direc-

tive 72/23/EEC and the EMC Directive

89/336/EEC as amended by Directive

93/68/EEC.

WARNING

Read Before Connecting

Only connect electrical equipment that

is properly grounded with a 3-prong

AC plug. Older amps with 2-prong

plugs should be serviced before using

them with any amp switcher. An im-

properly grounded amp can be a very

dangerous thing and never should be

used in multi-amp setups.

Radial Engineering takes no re-

spon si bil i ty for how the Twin-City is

connected or used. It is the user’s full

re spon si bil i ty to ensure that proper

electrical connections are maintained

on all equipment connected to the

Twin-City, and that proper building

electrical codes have been followed

wherever the Twin-City is used.

Note that damage to the Twin-City or

other connected equipment caused

by improper wiring or improperly

grounded equipment is not covered

under the warranty.

Produkt Specifikationer

Mærke:	Radial Engineering
Kategori:	Ikke kategoriseret
Model:	Twin-City

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