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manual abstract
• SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL. • OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME. • WARNING: THIS UNIT REQUIRES A SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRIC CODES HAVING THE LINE SUPPLY VOLTAGE, POWER, AND FREQUENCY IDENTIFIED ON THE REAR OF THE UNIT. THE OUTLET MUST REMAIN ACCESSIBLE TO DISCONNECT THE UNIT IF A FAULT SHOULD ARISE WHILE IN USE. THIS UNIT SHOULD BE UNPLUGGED WHEN NOT IN USE. EXPLANATION OF GRAPHICAL SYMBOLS: "IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL" "DANGEROUS VOLTAGE" = = “ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.” EXPLICACION DE SIMBOLOS GRAFICOS: “VOLTAJE PELIGROSO” "REFERREZ-VOUS AU MANUAL D'UTILISATION" "DANGER HAUTE TENSION" EXPLICATION DES SYMBOLES GRAPHIQUES: V4BH Bass Amplifier An Introduction to your new Ampeg V4BH Bass Amplifier The harmonically rich sound and legendary performance of the classic AMPEG SVT are redefined in the V4BH. This dynamically powerful bass amp delivers a thunderous 100 watts of unsurpassed quality, reliability and tonal flexibility. It also provides the classic vibrance of tubes as well as contemporary features. The features and controls of your V4BH are covered in detail within the pages of this owner’s guide. We recommend going over them before you use the amplifier. Features In true Ampeg tradition, your new V4BH offers you more power, performance and flexibility than any other bass amplifier in its class. Below are some of the outstanding features of your new amplifier – features which set it apart from the competition! Additional information on these features can be found on the pages indicated. • -15dB INPUT: This feature is perfect for “active” basses (page 4) • ULTRA LO AND ULTRA HI SWITCHES: These enable you to tailor your sound in many different ways at the touch of a button (page 4) • 5-POSITION FREQUENCY SELECTOR: Take your pick from the five center frequency points to get just the right midrange voice (page 4) • SLAVE OUT: Use for powering another amp from the V4BH’s preamp (page 5) System Block Diagram 0dB INPUT GAIN ULTRA LO MID FREQUENCY MASTER BUFFER PREAMP OUT PWR AMP INPUT SLAVE OUT BAL OUT POWER AMP PWR/STDBY LED ULTRA HI -15dB INPUT BASS TREBLE 4 OHMS8 OHMS IMPEDANCE SPEAKON* JACK 1+ 2+ 1-2- *Speakon is a registered trademark of Neutrik U.S.A. SPEAKER OUT EXT. SPEAKER OUT V4BH Bass Amplifier The Front Panel Controls and Their Use Gain Bass Midrange Frequency Treble Master Standby Power HiHi LoLo Ultra Hi / LoUltra Hi / Lo15dB15dB0dB0dB 0105432198760 10 54 3 2 1 9 8 7 6 0 10 54 3 2 1 9 8 7 6 0 10 54 3 2 1 9 8 7 6 0 10 54 3 2 1 9 8 7 6 5 43 1 2 0 10 54 3 2 1 9 8 7 6 Standby/Standby/ PowerPower 1 2 345 1. 0dB INPUT: The signal output from an instrument (active or passive – typically passive) or a line level signal may be connected here by means of a shielded instrument cable. The signal at this jack is sent into the preamp at full strength. 2. -15dB INPUT: The signal output from an instrument (active or passive – typically active) or a line level signal may be connected here by means of a shielded instrument cable. The signal at this jack is padded 15dB before it is sent into the preamp. 3. GAIN: This control adjusts the basic level of signal in the preamp. 4. ULTRA HI: This switch boosts high frequencies. 5. ULTRA LO: This switch, when depressed, provides emphasis to the low frequencies by boosting the low frequencies and selectively cutting the mid frequencies. 6. BASS: This is the primary low frequency control. It allows for 12dB of cut or boost at 40Hz. 6 7 8 910 7. MIDRANGE: This is the primary midrange control. It allows for 20dB of cut or 10dB of boost at the center frequency selected by the Frequency control (8). 8. FREQUENCY: Allows you to select the center frequency for the Midrange control (7), giving you a choice of five “voices” for the Midrange. The numbers correspond to the following center frequencies as indicated: 1=220Hz, 2=450Hz, 3=800Hz, 4=1.6kHz, 5=3kHz. 9. TREBLE: This is the primary high frequency control. It allows for 20dB of cut or 15dB of boost at 4kHz. 10. MASTER: This controls the signal level to the power amp and therefore the overall listening level. It also controls the level to the Preamp Out jack (20). 11. STANDBY/POWER LED: This is a dual-function LED. In Standby Mode, it glows red. In the On mode (when high voltage is applied to the tubes) it glows green. If it does not turn green in the On mode, there is no high voltage present and the unit needs servicing. 1112 13 12. STANDBY: The Standby mode allows the tubes to warm up or remain warm without high voltage being applied to them. This extends tube life. This switch should be OFF when first turning the amplifier on. Allow the unit to warm up for 20 seconds before switching ...