User manual HUGHES & KETTNER BASSBASE250

[. . . ] The Bassbase 250's newly developed "DYNACLIP" circuitry suppresses the distortion created through dynamic peaks without limiting the dynamic spectrum. 1 Specially developed 10" speakers in the combo version. Two speakers developed specifically for the Bassbase 250 ensure a powerful, percussive reproduction of the amp's output, replete with precise transient response. Additional tweeter for upper frequency response. An additional tweeter provides transparent highs and accurate harmonic reproduction. Ergonomic, back lit front panel controls. The front panel controls are- arranged for maximum accessibility and simplicity. Potentiometers, function permitting, are center notched for a "memory effect". Back lighting provides for visibility on even the darkest stages. The Bassbase 250 was engineered to provide you with the opportunity to comfortably create your personal sound. [. . . ] This allows the mid-range to be custom tailored to your personal tastes. (6) FREQ: This pot dials in the frequency you want to adjust; app. 2000 bz rotated completely right and 140 hz at the far left position. (7) LEVEL: Determines the amount of boost or taper to the frequency you have dialed in with the FREQ pot. The parametric tone control enables you to adjust the entire mid-range spectrum. The mid-range is the most essential indegredient in a good bass sound, the entire tonal character is determined in this frequency range. We advise you to familiarize yourself with the variety of tones the FREQ and LEVEL controls have to offer and experiment with these pots to hear all the possibilities. (8) TREBLE: The TREBLE pot adjusts the high frequency through a wide band and determines the amount of bite and harmonics. 8khz. (9) FX-MIX: The Bassbase 250 is equipped with an effects loop switched in parallel for external effects devices. Conventional effects loops, switched in series, send the entire signal through the effects device, whereas the Bassbase's FX-MIX pot allows you to determine the precise amount of the original signal you want to send through an effects device. FX-MIX: The far left position allows none of the signal to be sent down the effects loop path. Rotate the pot to the far right, and the entire signal is sent for processing. (The effects path functions now in the same fashion as in a conventional effects loop). NOTE: If you choose not to connect an external effects device, ensure the FX-MIX pot is rotated completely left!The effects loop can be switched on and off via a footswitch. (10) MASTER VOLUME: controls the overall volume of the BASSBASE 250. (11) DYNACUP: A control LED illuminates when DYNACLIP is operational. DYNACLIP is a power amp circuit that was developed exclusively for the BASSBASE. It efficiently suppresses power amp clipping without sacrificing peak dynamics, as opposed to peak limiters. Unpleasant and potentially speaker damaging distortion is avoided and the effective power output is increased. (12) BAL. PA OUT: This XLR output jack sends a transformer balanced signal to feed a PA board. (13) DIRECT: Depress the DIRECT switch to bypass Gain, tone controls and the effects loop to send an instrument signal via BAL. PA OUT. (14) GROUND: Depress the GROUND (LIFT) switch to sever the ground between BAL. PA OUT and the PA board. Choose the position that has the least amount of audible noise. (15) PHONES: Headphone jack. Connect headphones here for silent practice sessions. if the PHONES jack is used, the speaker in the combo version is automatically disengaged. (16) MAINS: . Main power supply switch. The front panel inscriptions will illuminate at the ON position. REAR PANEL FEATURES AND FUNCTIONS Located on the BASSBASE 250's rear panel, you will find the AC power supply socket for the factory supplied Euro-mains lead. Integrated into the AC power supply socket is the FUSE bracket. In order to change a fuse, depress the fittings on both sides of the bracket and pull the fuse out. The appropriate fuse amperage for each model can be determined by reading the value annotated below the fuse bracket. VOLTAGE SELECTOR: All European models can be adjusted to operate at 220V or 240V. [. . . ] The second master volume is regulated with the FX MIX pot on the front panel. You can now switch back and forth between two seperate master volumes. CARE OF YOUR AMP AND WARRANTY CONDITIONS A WORD ABOUT VALVES n Valves need to reach a certain operating temperature. They need a few seconds after the power has been switched on to warm up before they will work. Once you have switched the amplifier off, give it a few minutes to cool down before transporting it. [. . . ]