[. . . ] This symbol warns the user of dangerous voltage levels localized within the enclosure. This symbol advises the user to read all accompanying literature for safe operation of the unit. [. . . ] Do not drip nor splash liquids, nor place liquid filled containers on the unit. cAUTION: No user serviceable parts inside , refer servicing to qualified personnel only. Fender® amplifiers and loudspeaker systems are capable of producing very high sound pressure levels which may cause temporary or permanent hearing damage. Tilt-back cabinet legs for easy monitoring With this amp, guitarists can enjoy the original BlackfaceTM Fender tones heard on countless Country, Jazz and Rock recordings. Then, with the flip of a couple of switches, "modify" the amp to create cranked-up tones bristling with sustain and harmonics. These Vibroverb modifications were perfected by César Diaz, world famous "Amp Doctor, " who worked closely with Fender during the inception of this new model. Original 1964 Vibroverbs are hard­to­find collectables, and are particularly prized by players who enjoy the "Texas Blues" style. Your brand new Vibroverb will allow you to put a fresh spin on a classic theme. Two fully independent channels, each with input jacks for normal- and high-gain instruments · Provides 6dB less gain than input 1. Most effective at low volume, the boost tapers off as the VOLUME setting increases. [. . . ] Speaker Connections: ALWAYS keep 1 of these 3 speaker configurations connected to the amplifier when powered ON to prevent damage to the amplifier: (1) One 8­ohm speaker or (2) Two 8­ohm speakers or (3) An open plug and one 4­ohm speaker The NORMAL channel and the Vibrato effect are disabled when MODIFIED is selected; this increases preamp gain, allowing more distortion and sustain for the VIBRATO channel. NOTE: Switching circuits may cause a "pop" sound; use STANDBY while switching to mute if desired. [. . . ]