Marshall extension cabinet User manual

Introduction

Thanks to their sonic excellence and outstanding roadworthiness, Marshall cabinets have become the backbone of countless set-ups the world over. From major international festivals, to local pubs and clubs, the Marshall cab has come to personify the image of rock music with its brooding, on-stage presence - both visually and aurally.

This success is no accident; it is the product of many years worth of hard work, experience and listening. Many of our cabinet construction techniques have changed very little since the Guv’nor, Jim Marshall, hand-built his very first cabinet back in 1962. We still use the finest materials available and build all our cabinets to truly stand the test of time. We also carefully select the loudspeakers that best suit the particular purpose for which each cabinet is intended and test them exhaustively for optimum performance.

The purpose of this handbook is to offer some practical advice and general tips on cabinet usage. Please read it carefully and keep it in a safe place.

The fact that so many players use Marshall cabinets is a fitting testament to the quality and craftsmanship which

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goes into each and every one. With proper care and attention, there is no reason why your Marshall cabinet shouldn’t last you a lifetime!

4x12" Mono/Stereo Switching Facilities

To ensure maximum flexibility, some of our 4x12" cabinets boast a Mono/Stereo switching system on the back. When ‘Stereo’ mode is selected, the cabinet is split into two 8 Ohm ‘halves’ for use with a stereo power amp (e.g.: EL34 100/100, EL34 50/50 or EL84 20/20) such as used in a rack system. When ‘Mono’ is selected you are offered two different impedance inputs (4 Ohms or 16 Ohms) from which to choose. Always ensure you select the correct one to match the impedance of your amplifier and NEVER use both inputs at the same time when the cabinet is in ‘Mono’ mode.

1) Mono/Stereo Selection Switch

Selects either Stereo or Mono operation mode.

2) Right* input

When switch (1) is set to: i) Stereo, this provides connection to the right* side pair of speakers. Rated at 8 Ohms.

ii) Mono, this provides connection to all four speakers. Rated at 4 Ohms.

WARNING! Do not switch to

mono with stereo inputs

3) Left* Input

When switch (1) is set to: i) Stereo, this provides connection to the left* side pair of speakers.

Rated at 8 Ohms.

ii) Mono, this provides connection to all four speakers. Rated at 16 Ohms. *Note: No, we’re not insane here! ‘Right’ & ‘Left’ here refers to the two stereo

sides of the cabinet as seen (and heard!) when facing the front of the cab.

2x12" Stereo Selection Facilities

Some of our 2x12" cabinets are fitted with a Mono/Stereo selection plate on the back. This enables you to split the cabinet into two halves for use with a stereo set-up if you so desire.

Mono usage:

Use the input marked MONO (2), the impedance of which is clearly indicated above the jack.

Stereo usage:

Use both inputs (1 & 2). Once again the impedance of each is clearly marked.

WARNING! - Important safety instructions

FOLLOW ALL INSTRUCTIONS AND HEED ALL WARNINGS

Please read the instruction manual for this speaker cabinet and any other equipment to be used with this speaker cabinet carefully before use.

1. Never use a speaker cabinet or associated equipment in damp or wet conditions. No objects filled with

liquids should be placed on the apparatus. When cleaning, only use a dry cloth.

2. Do not attempt to remove or re-wire the internal speakers or any other components within the speaker

cabinet.

3. Refer all servicing to qualified personnel. Servicing is required when the speaker cabinet has been

damaged in any way, such as liquid being spilled or objects falling into it, the speaker cabinet being exposed to rain or moisture, the speaker cabinet not operating normally or being dropped or damaged in any way.

4. Ensure all associated equipment is switched off and unplugged from the mains before connecting or

disconnecting the speaker cabinet.

5. Always Plug the speaker lead into the speaker cabinet before plugging it into the amplifier.

6. Ensure any associated equipment is switched off and unplugged from the mains in the event of lightning

storms or if unused for long periods of time.

7. Always ensure that the supplied speaker lead is used to connect the speaker cabinet to associated

equipment.

8. Protect the speaker lead from being walked on, pinched or having heavy objects rolled over it. Ensure the

speaker lead is not entangled with any other lead. If a replacement speaker lead is required please contact your authorised Marshall Dealer.

9. If the speaker cabinet has switchable impedance, please ensure that the correct impedance is selected

and that any associated equipment impedance settings are also correctly set.

10. If the speaker cabinet has mono/stereo switching capability, ensure that the switch is in the correct position

for the desired operation.

11. Always move or transport speaker cabinets individually. Never attempt to move or transport speaker

cabinets if they have other cabinets or associated equipment stacked on or under them.

12. Always ensure that the speaker cabinet is on a level surface, whether used or stored individually, or as a

speaker cabinet stack, and/or with associated equipment placed underneath or on top.

13. Marshall speaker cabinets should only be stacked with compatible Marshall speaker cabinets. Never

attempt to stack another manufacturers speaker cabinet with a Marshall speaker cabinet. If you are unsure, contact your authorised Marshall Dealer.

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Note:

This equipment has been tested and found to comply with the requirements of the EMC directive

(Environments E1, E2 and E3 EN 55103-1).

Caution: Any changes or modifications not expressly approved by the party responsible for compliance may void the users authority to operate the equipment.

KEEP THESE INSTRUCTIONS

Introducción

Gracias a su excelente calidad de sonido y a su resistente construcción, los bafles de guitarra Marshall han sido desde siempre la espina dorsal de innumerables equipos en todo el mundo. Desde los principales festivales internacionales hasta las pequeñas salas y pubs, el bafle Marshall ha definido la estética y la personalidad del rock con su imponente presencia (acústica y visual) en todos los escenarios.

Este éxito no es fortuito; es el resultado de muchos años de trabajo, experiencia y escucha. Muchas de las técnicas que empleamos en la fabricación de nuestros bafles han cambiado muy poco desde que el Jefe, Jim Marshall, construyó su primer bafle a mano allá por 1962. Aun utilizamos los mejores materiales disponibles y seleccionamos todos los elementos para soportar el duro paso del tiempo. También seleccionamos meticulosamente los altavoces que montamos para obtener el mejor rendimiento en la aplicación para la que cada bafle es concebido, y comprobamos exhaustivamente su funcionamiento y óptima respuesta.

El hecho de que tantísimos guitarristas usen bafles Marshall es la evidencia de la calidad y artesanía con que se fabrican todos y cada uno de ellos. Adoptando las precauciones adecuadas, no hay razón por la que tu bafle Marshall no te vaya a durar toda la vida.

Conmutación Mono/Estéreo de los 4x12"

Para proporcionar la máxima flexibilidad, algunos de nuestros bafles de 4x12" disponen de un sistema de conmutación Mono/Estéreo en el panel de conexión trasero. Cuando se selecciona el modo Estéreo (Stereo), el bafle se divide en dos ‘mitades’ de 8 ohmios para su uso con amplificadores estéreo (como el EL34 100/100, EL34 50/50 o el EL84 20/20), los cuales normalmente van montados en rack. Cuando se selecciona el modo Mono, se dispone de dos conexiones de entrada de diferentes impedancias (4 ó 16 ohmios) entre las que elegir.

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Asegúrate siempre de seleccionar la entrada de impedancia correspondiente a la de salida del amplificador y NUNCA uses ambas entradas simultáneamente en el modo Mono.

1) Conmutador de selección Mono/Estéreo

Para seleccionar el modo de funcionamiento Mono o Estéreo.

2) Entrada derecha (Right)*

Cuando el conmutador (1) está en modo: i) Estéreo, esta entrada conecta el acceso a la pareja de altavoces de la derecha*,

con una impedancia total de 8 ohmios. ii) Mono, esta entrada conecta el acceso a los cuatro altavoces, con una

impedancia total de 4 ohmios.

3) Entrada izquierda (Left)*

Cuando el conmutador (1) está en modo: i) Estéreo, esta entrada conecta el acceso a la pareja de altavoces de la izquierda*,

con una impedancia total de 8 ohmios. ii) Mono, esta entrada conecta el acceso a los cuatro altavoces,

con una impedancia total de 16 ohmios. *Nota: No, no nos hemos vuelto locos. ‘Derecha’ e ‘Izquierda’ aquí se refiere a los dos lados del estéreo, tal como

se ve (y se oye) de cara al frontal del bafle.

¡ATENCIÓN! Nunca pongas el

conmutador en posición mono

al usar ambas entradas con

una señal estéreo

Utilización en estéreo de los 2x12"

Algunos de nuestros bafles de 2x12" disponen de una placa trasera de conexión para seleccionar su utilización en mono o en estéreo. De esta forma se pueden utilizar estos bafles en sistemas de amplificación estéreo, dividiéndose en dos ‘mitades’.

Utilización en mono:

Usa la entrada marcada con MONO (2), cuya impedancia está claramente indicada sobre el conector.

Utilización en estéreo:

Usa ambas entradas (1 y 2). En este caso la impedancia de cada conexión está claramente indicada.

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