[. . . ] 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. [. . . ]