User manual GALLIEN-KRUEGER FUSION 550

[. . . ] Fusion 550 Owner's Manual Fusion 550 Bass Amplifier Congratulations Your purchase of a new Gallien-Krueger amplifier is surely the result of much careful consideration on your part. For our part, we at Gallien-Krueger are pleased that you chose us, and are determined that you will be a satisfied customer. In choosing GK, you now own an amplifier with many unique features which will allow you to create your own distinct sound. To get the most out of your new amplifier please take a few minutes to read through this manual. [. . . ] 6) Contour: Reshapes the voice of the amplifier by cutting mid frequencies at either 500Hz or 800Hz depending on the position of the Frequency Select Switch. 9) Treble: Active shelving type control which boosts and cuts the high frequencies. 10) High Mid: Active bandpass type control which boosts and cuts at about 1kHz. . 11) Low Mid: Active bandpass type control which boosts and cuts at about 250Hz. 12) Bass: Active shelving type control which boosts and cuts the low frequencies. 13) Horn Bi-Amp: Sets the ratio between the horn output and the master output. 14) Master: Master volume control. 15) Power & LED: Power on/off switch and LED. The LED ring is blue when the amplifier is on and flashes when the amplifier is muted via the Mute switch. If there is an electrical fault (shorted output, over heat) the protection circuitry will be engaged muting the amplifier output and the LED ring will turn red. This feature is automatically engaged when you connect to a GK HBS compatible enclosure, giving you independent control of the tweeter and woofer signals. Now you can push the woofers to the max while the tweeter remains clean, crisp, and free of clipping distortion. A smooth tight tone is easily dialed in by adjusting the Horn and Woofer Master controls on the amplifier's front panel. BI-AMP MODE FULL RANGE MODE Horn Bi-Amp Mode: This mode requires a GK Horn Bi-Amp compatible bass cabinet. Use a properly wired four-conductor Speakon cable to connect to your cabinet. Set the switch on the back of your GK HBS compatible enclosure to Bi-Amp. Use the Woofer/Main knob to control the output signal to the woofer, and the Horn knob to control the output signal to the horn. Note: The 50W horn amplifier has a fixed frequency output of 5kHz and up (high frequencies only). It will not provide a usable signal to drive a separate speaker cabinet. Full range Mode: This mode is compatible with virtually any standard bass cabinet. Use a two-conductor Speakon cable or a ¼" speaker cable to connect to your cabinet. If using a GK HBS compatible enclosure, set the switch on the back of the cabinet to Full range. In this mode, the cabinet's internal passive crossover is used to split the signal between the woofer and horn. Use the Woofer/Main knob on the front of the amplifier to control your output level. [. . . ] In a typical full range system, there is no way to get that growl while keeping the definition that the horn provides. In GK's Horn Bi-Amp system, an active (electronic) crossover allows a full range signal through to the main (woofer) amplifier, while only the high frequency portion of the signal (5kHz and above) is allowed through to the 50 watt Horn amplifier. There are three primary benefits to this system over a traditional full range system. improperly wired speaker cables. If an unsafe condition is detected, the output signal is immediately muted and the power light changes from blue to red. [. . . ]