Marshall Amplifiers

 selected Marshall Amps Stacks, Cabinets, Heads and Combos

Marshall Amplification is a British company which designs and manufactures electric guitar amplifiers. Marshall amplifiers are well known and highly popular among guitarists. The sight and sound of a Marshall stack amp with a Gibson Les Paul or Fender Stratocaster is an iconic image in pop culture. Marshall amps were originally built as direct copies of Fender amplifiers, but soon incorporated certain traits which made them more favorable to guitarists seeking a heavier sound.

Like most professional-level amplifiers, Marshall amplifiers still use valve preamp and poweramp stages instead of solid state devices (transistors), although Marshall also manufactures cheaper solid-state or hybrid devices.

Valve amplifiers (known as "tube amplifiers" in North America) are generally considered to exhibit a "warmer" tone than those of transistor amps, particularly when overdriven; instead of abruptly clipping off the signal at cut-off and saturation levels, the signal is smoothly rounded off. Vacuum tubes also exhibit different harmonic effects than transistors (see tube sound for more about the sonic differences between transistors and vacuum tubes). Though technology continues to change, the most sought after, best sounding, and most expensive amps use technology that is considered quite obsolete. The sound of a Marshall 1959SLP or JCM800 amp is among the most recognized in popular music, and there is a constant demand for both cutting edge and vintage amplifiers. They are now considered some of the most expensive amps on the market.

The classic Marshall Stack is one of the defining images behind loud rock music. A full stack consists of one head containing the actual amplifier, on top of two stacked 4x12s, which are loudspeaker cabinets each containing four 12 inch loudspeakers arranged in a square layout. The top cabinet has the top two loudspeakers angled slightly upwards, giving the Marshall stack a distinctive appearance. When a single cabinet is used, the complete unit is called a half stack.

In the early-mid 1960s, Pete Townshend and John Entwistle of The Who were directly responsible for the creation and widespread use of stacked Marshall cabinets. Pete later remarked that John started using Marshall Stacks in order to hear himself over Keith Moon's drums and Townshend himself also had to use them just to be heard over John. In fact, the very first 100 watt Marshall Amps were created specifically for Entwistle and Townshend when they were looking to replace some equipment that had been stolen from them. They approached Jim Marshall asking if it would be possible for him to make their new rigs more powerful than those they had lost, to which they were told that the cabinets would have to double in size. They agreed and six rigs of this prototype were manufactured, of which two each were given to Townshend and Entwistle and one each to Ronnie Lane and Steve Marriott of The Small Faces. These new "double" cabinets (each containing 8 speakers) proved too heavy and awkward to be transported practically, so The Who returned to Marshall asking if they could be cut in half and stacked, and although the double cabinets were left intact, the existing single cabinet models (each containing 4 speakers) were modified for stacking, which has become the norm for years to follow.

Entwistle and Townshend both continued expanding and experimenting with their rigs, until (at a time when most bands still used 50 to 100W amps with single cabinets) they were both using twin Stacks, with each Stack powered by new experimental prototype 200W amps, each connected to the guitar via a Y-splitter. This, in turn, also had a strong influence on the band's contemporaries at the time, with Cream and The Jimi Hendrix Experience both following suit. However, due to the cost of transport, The Who could not afford to take their full rigs with them for their earliest overseas tours, thus Cream and Hendrix were the first to be seen to use this setup on a wide scale, particularly in America. Ironically, although The Who pioneered and directly contributed to the development of the "classic" Marshall sound and setup with their equipment being built/tweaked to their personal specifications, they would only use Marshalls for a couple of years before moving on to using Sound City equipment. Cream, and particularly Hendrix, would be widely (and incorrectly) credited with the invention of Marshall Stacks.

The search for volume was taken on its next logical step with the advent of "daisy chaining" two or more amplifiers together. As most amplifier channels have two inputs, the guitar signal being present on both sockets, the cunning musician hooked the spare input of one channel to an input on another amp. By 1969 Hendrix was daisy chaining four Stacks, incorporating both Marshall and Sound City amplifiers, as recommended to him by Townshend.

This competition for greater volume and greater extremes was taken even further in the early 1970s by the band Blue Öyster Cult, which used an entire wall of full-stack Marshall Amplifiers as their backdrop. Bands such as Slayer and Yngwie Malmsteen also use walls of Marshalls. Both Kerry King and Jeff Hanneman of Slayer can be seen playing in front of a total of 24 cabinets, and Yngwie has used as many as 31. However, it is usually the case that far less are actually powered, as using this many could cause serious problems with the overall sound mix of a live show. In most cases these are "dummy cabs," which are onstage for visual impact, not actually played through. For ease of transportation and lifting, most of these actually do not even contain any speakers. The same goes for some of the amp heads in a scenario like this, as they are just the wooden frame with, in fact, no heavy inner workings.

Such is the ubiquity of the sight of a wall of Marshalls at a rock concert; many artists who do not even use them have the dummy stacks on stage. Rick Parfitt of Status Quo, for example has a wall of Marshalls, but actually uses a combination of Vox AC-30 in Marshall cabinets and JCM900's.

from Wikipedia,licensed under the GNU Free Documentation License.