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IMPORTANT SAFETY PRECAUTIONS

WARNING: When electrical products are used,

basic precautions should be followed, including:

•

Read all instructions before using this product.

•

Do not use this product near water, for example, near a bathtub, sink, in a wet

basement, near a swimming pool or the like. Prevent the unit from getting wet from

rain, snow, etc

…

•

Care should be taken so that objects do not fall, and liquids are not spilled into,

the enclosure through the openings.

•

This product should be located so that its position or location does not interfere with its

proper ventilation. It is important that the vents on the top, bottom, and sides of the unit are

allowed

“t

breathe.”

•

The iAMP® should be located away from heat sources such as radiators, heat

registers, or other products that produce heat.

•

Do not leave the unit in an extremely hot environment (such as inside a car) for

extended periods of time.

•

The product should be serviced by qualified personnel when:

The power supply cord or the plug has been damaged; or

Objects have fallen, or liquid has been spilled into the product; or

The product has been exposed to rain or moisture; or

The product does not appear to operate normally or exhibits a

marked change in performance; or

The product has been dropped, or the enclosure damaged.

WARRANTY SERVICE FORM

1. Complete this form.

2. Include a copy of your Bill of Sale

3. Pack unit, this form and copy of original bill of sale and ship, insured to:

Euphonic Audio

11 Revere Court

Princeton Jct., NJ 08550

Name:

Address:

____________________________________________________

Telephone Number: Email:

Purchased at: Date of Purchase:

Model/Serial Number:

Brief Description of Problem:

•

The product should be connected to a power supply of the type described in the operating

instructions or as marked.

Return Shipping: COD:

Prepaid Credit Card

•

If you live in area prone to frequent lightning strikes (e.g., Florida), as a

precautionary measure, unplug the iAMP® from the AC power source, especially

during severe thunderstorms.

•

Do not attempt to service the product yourself. All servicing should be referred to

qualified service personnel at Euphonic Audio, Inc.

•

Use of the iAMP® may cause permanent hearing loss. Do not operate for long

periods of time at a high volume level or at a volume level that is uncomfortable,

particularly in a small, enclosed area. If you experience any ringing in the ears or any

suspected hearing loss you should consult an audiologist.

Credit Card Number:

Expiration Date:

If the billing address is not the same as the shipping address, please provide

billing address:

Billing Address: ____________________________________________________

____________________________________________________

IMPORTANT SAFETY PRECAUTIONS

WARRANTY SERVICE FORM

DOUBLER SPECIFIC FEATURES

The Doubler 2 provides some specific

features designed for the

upright/acoustic player.

Notch Filter:

To help with feedback, the

Doubler has a variable Notch Filter. The

Notch Filter attenuates the signal 15db from 50 to 600K at .05 octaves.

THE NOTCH

FILTER IS ONLY AVAILABE ON CHANNEL 2.

Microphone Input with Phantom Power:

The Doubler has a Low Impedance Micro-

phone input with a phantom power option. The phantom power ON/OFF option is

controlled by a slide switch on the back of the preamp board (see photo). The

phantom power is ON with the switch in the left position, and OFF with the switch

in the right position. This switch is intended to be a set and forget feature. The MIC

ON switch on the front panel will turn a microphone ON and OFF and tell the ISS

circuitry that a microphone is in use.

Phase Control:

The Doubler features an innovative 180 degree sweep able phase

control to adjust the phase between Channel 1 and Channel 2. This control only

works when BOTH Channel 1 and Channel2 inputs are being used.

PLEASE NOTE: If you want to use a single input and switch between 2 different EQ

settings (i.e. clean/solo) you MUST use Channel 2 as your

“Master”

channel

(DOUBLERONLY).

Unique Features of the iAMP® Doubler 2

The phase control can be useful when combining a pickup and a microphone or two

pickups. Anytime two different pickups or a pickup and a microphone are combined

there are phase interactions between the two. This can result with degrees of

cancellation at different frequencies. Typical phase controls can only reverse the

phase at one position. (180 degrees) The variable phase control on the Doubler offers

the flexibility to alter the phase from 0 degrees (fully counterclockwise) to 180 degrees

(fully clockwise). Experimentation is necessary to find the best sound. No two pickup

or microphone sources react the same when combined, but for the first time one is

able to fine tune the

“sweet

spot”.

Please note that changes in the eq settings can

alter the phase relationships also. Bottom-line

—

experiment with the eq and phase

settings to find the best sound.

The Doubler offers a high quality microphone input. This can accommodate any low

impedance dynamic microphone or a condenser microphone that requires phantom

power. (48 volts). The phantom power switch should be in the

“off”

position unless

using a microphone requiring phantom power.

The notch filter on channel 2 is useful in eliminating feedback, especially when using

a microphone. A notch filter attenuates a very narrow frequency range (typically not

wider than one note). To use it, raise the volume on channel 2 until feedback begins

to occur. Then turn on the notch switch and rotate the knob until the feedback is
eliminated

TONE SHAPING

The iAMP® Doubler 2 features a simple yet extremely musical, 3 Band EQ. The

elegant design and pristine sound of the 3 band tone shaping of the Doubler allows

for a totally neutral sound when set flat. Each band can add +/- 12dB of gain on each

channel. The low and high are shelving and the mid control is
centered around 600hz on Channel 1 and 800hz on Channel 2.

OUTPUT SECTION

Main Control: Adjusts the level going into the power amplifier section. The iAMP®

Doubler 2 was designed to be exceptionally clean, accurate and versatile. If you want

“dirtier”

overdriven-type sound, it is best to use an effects device through the

Effects loop.

Post/Pre EQ:The DI EQ can be set to send either a clean (PRE) or colored (POST)

signal created in the Tone Shaping section. See

“A Loo

k Inside

”

for specific jumper

settings.

Mute Switch: The Mute Switch can be configured to mute the DI and/or the

Effects/Tuner Send in addition to the speaker out. The Mute Switch can be accessed

via the front panel switch or with an optional footswitch.

The red mute LED will illuminate if the Doubler is muted. Please note the amp is muted

at power on.

DI Output Jack: Balanced DI output for sending a balanced signal directly to low

noise studio equipment. The DI can be configured to either Pre (default) or Post EQ.

DOUBLER 2 FEATURES