Marshall Amplification is the original creator of speakers that can (figuratively) be turned up to "11" on their volume dials. One of the world's leading and best-known makers of guitar amplification equipment, Marshall makes amplifiers and accessories for electric and acoustic guitars, as well as other musical instruments and small public-address systems. Products like amp heads, speaker cabinets, combo amps, and stacks are distributed worldwide through music-equipment retailers. Prices for amps and stacks range from $100 to about $2,000. The company traces its historical roots back to 1962, when Dr. Jim Marshall opened a music shop selling specialized amplifiers often requested by the era's musicians.