Yamaha F-20B Owner's Manual - Page 1
Yamaha F-20B Manual
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BASS AMPLIFIER Owner's 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. Precautions G To avoid possible damage do not expose the unit to: • direct sunlight • very high or low temperature/humidity • sand or excessive dust * Especially inside a vehicle, the temperature may rise excessively - do not leave the F-20B in your parked car on a sunny day! G Before connecting/disconnecting cables or turning the unit on/off, be sure to set the VOLUME control on the F-20B to 0. G Keep the F-20B away from neon signs or fluorescent lighting to prevent noise pickup. G Handle the unit carefully - never apply excessive force to the controls and avoid dropping the unit. G For safety, always remove the power plug from the AC wall outlet if there is any danger of lightning striking in your area. G To prevent damage and possibly electrical shock, never open the case and tamper with the internal circuitry. G Never use solvents such as benzene or thinner to clean the F-20B. Wipe clean with a soft, dry cloth. Specifications 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 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) * Specifications and external appearance are subject to change without notice. Control Panel q INPUT : Connect your bass guitar to this jack. w 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 ?) when using a passive type bass guitar (one without a built-in pre-amplifier). Set the switch to its ACTIVE position (depress the switch >) 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. e 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. r TREBLE : Controls the level of the amplifier's high frequencies. t HIGH MID : Controls the level of the amplifier's upper middle fre- quencies. y LOW MID : Controls the level of the amplifier's lower middle fre- quencies. u BASS : Controls the level of the amplifier's low frequencies. i Power Indicator : The lamp will light when the F-20B's power switch is ON. o 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. !0 PHONES : Connect a pair of headphones to this jack. * The speaker will produce no sound when a pair of headphones is connected to this jack. !1 POWER : This is the amplifier's power switch. When the switch is ON, the power indicator i will light. qw e r t y u i o !0 !1