Yamaha f-20B - User Manual

Thank you for purchasing a Yamaha F-20B Bass Amplifier.

To get the best results and longest life out of your F-20B, we recommend that you

carefully read this manual, and keep it in a safe place for future reference.

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To avoid possible damage do not expose the unit to:

• direct sunlight
• very high or low temperature/humidity
• sand or excessive dust

* E s p e c i a l l y i n s i d e a v e h i c l e , t h e t e m p e r a t u r e m a y r i s e

excessively — do not leave the F-20B in your parked car on a
sunny day!

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Before connecting/disconnecting cables or turning the unit on/off, be
sure to set the VOLUME control on the F-20B to 0.

●

Keep the F-20B away from neon signs or fluorescent lighting to
prevent noise pickup.

Precautions

Rated Output Power :

20 W

Speaker :

25 cm x 1

Controls :

VOLUME, TREBLE, HIGH MID, LOW MID, BASS, Input

Level Select Switch (PASSIVE/ACTIVE)

Input/Output Terminals :

INPUT, AUX IN, PHONES

Control Panel

Specifications

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INPUT :

Connect your bass guitar to this jack.

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PASSIVE/ACTIVE (Input Level Select Switch) :

Select the

setting that best matches the type of bass guitar you are using. Set
the switch to its PASSIVE position (raise the switch

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) when using a

passive type bass guitar (one without a built-in pre-amplifier). Set the
switch to its ACTIVE position (depress the switch

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) when using an

active type bass guitar (one with a built-in pre-amplifier), or when the
sound of a passive instrument has a lot of distortion.

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VOLUME :

Controls the volume level.

Active Equalizer

The center position (0) of each knob is “flat”, having no effect. Rotating
the knob to the right (+) boosts the frequency while rotating the knob to
the left (–) cuts the frequency.

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TREBLE :

Controls the level of the amplifier’s high frequencies.

t

HIGH MID :

Controls the level of the amplifier’s upper middle fre-

quencies.

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LOW MID :

Controls the level of the amplifier’s lower middle fre-

quencies.

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BASS :

Controls the level of the amplifier’s low frequencies.

●

Handle the unit carefully — never apply excessive force to the
controls and avoid dropping the unit.

●

For safety, always remove the power plug from the AC wall outlet if
there is any danger of lightning striking in your area.

●

To prevent damage and possibly electrical shock, never open the
case and tamper with the internal circuitry.

●

Never use solvents such as benzene or thinner to clean the F-20B.
Wipe clean with a soft, dry cloth.

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Power Indicator :

The lamp will light when the F-20B’s power

switch is ON.

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AUX IN :

Connecting the output of an external audio device, such

as a CD, MD, cassette deck, etc., to this jack allows you to listen to
the audio playback of the device while playing along on your bass
guitar.

* Use the volume control on the audio device to control its volume level.

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PHONES :

Connect a pair of headphones to this jack.

* The speaker will produce no sound when a pair of headphones is con-

nected to this jack.

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POWER :

This is the amplifier’s power switch. When the switch is

ON, the power indicator

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will light.

Power Requirements :

U.S. and Canadian models : 120V, 60Hz

General model : 230V, 50Hz

Dimensions (W x H x D) :

357 x 453 x 242 mm (14.1" x 17.8" x 9.5")

Weight :

10.5 kg (23 lbs 2 oz)

BASS AMPLIFIER

Owner’s Manual

* Specifications and external appearance are subject to change without notice.

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