User manual MARSHALL JVM410H HEAD

[. . . ] ENGLISH From Jim Marshall I would like to thank you personally for selecting one of our new `JVM' amplifiers. Since I started Marshall Amplification in 1962 I have witnessed some incredible breakthroughs and advances in amplifier design technology, such as master volume amps, channel switching, reverb, effects loops, MIDI technology, speaker emulation and digital effects processing, to name just a few. These may all seem commonplace features nowadays but that certainly wasn't always the case. However, the same values that were present in the first Marshalls are still very much here today: meticulous workmanship, reliability, stylish looks and, above all, great Marshall tone. [. . . ] CRUNCH ORANGE MODE: This mode is reminiscent of the Marshall JCM800 2203 amplifier, a staple of hard rock. The gain structure is gain + gain + gain + tone. PRESENCE, RESONANCE These controls are power amplifier controls and only have effect when playing through a speaker (not in silent recording). They affect how the power amplifier reacts to the connected speakers and how much control the amplifier has over them. Increasing the RESONANCE control emphasises the natural speakers resonance for an improved bass response. In the same way, increasing the PRESENCE control emphasises the speaker's high frequencies which will be heard as an improved high frequency response which adds presence to the sound. 6 Presence and Resonance constitute a powerful power amplifier equaliser, allowing responses from a `^' shape when they are fully off, which is felt as a mid boost, to a `v' shape when they are turned clockwise, which is felt as a scooped sound. Again, the effectiveness of these controls is highly dependant on the kind of connected speakers. Care has to be taken to avoid over excursion of the speaker cones in high resonance settings. FX LOOP This is a programmable FX loop which features a MIX control on the rear panel and it is located after the pre-amp, right before the reverb and serial loop circuits. Pressing the FX Switch engages this effects loop. Please refer to the Serial / Parallel Loop description later on in the handbook for its operation. FOOTSWITCH / MIDI PROGRAM This switch has a dual function: Pressing it once we enter the FOOTSWITCH PROGRAM mode. It is indicated by a continuous red light. Pressing it twice we enter the MIDI PROGRAM mode. It is indicated by a blinking red light. Footswitch program and use The JVM range features a new type of fully configurable footswitch. Connection to the amplifier requires a standard mono 1/4" jack to jack cable. Any guitar lead will work and practically there should be no limit in its length. When the front panel FOOTSWITCH / MIDI PROGRAM switch is off, the footswitch operates in safe mode and executes the commands the moment the switch is pressed down. If you enter the FOOTSWTICH PROGRAM mode (LED red) you will be able to program the footswitch but nevertheless the footswitch and the amplifier will remain fully operational with the only difference that the commands will be executed when releasing the footswitches, as opposed to the normal mode. Each of the individual footswitches has 2 modes of operation: preset store and switch store. In preset store mode, any of the footswitches can be configured to store the current amplifier status. [. . . ] If you do not connect any effect to the SERIAL / PARALLEL FX LOOP the MIX control can be used to act like an extra volume control in any of the channels. Hint 2: To have a tuner output muting the amplifier, connect the tuner to the FX send and select the Clean channel. Turn the MIX control to WET and switch the FX loop on. Store this preset as described before and label it for example as `tuner'. Obviously in this configuration it is not possible to connect any other effect to the loop. [. . . ]