User manual MARSHALL MB450H

[. . . ] The frequency of the middle band is adjusted by means of the Mid Freq control. Usually this control will be used to remove mids rather than increase them making the bass sound rounder and fuller. Increasing the mids usually makes the bass sound `boxy'. This push switch allows you to change between the amp's two channels, Modern and Classic, via the front panel. When this switch is `out' the Modern Channel is engaged and the LED is green. [. . . ] If on the other hand you would like a distorted sound, simply turn up the Gain control and drive the ECC83 valve until the required amount of distortion is achieved creating the warm Marshall tone. Position 1 tailors the response of the amplifier for smooth low end, restrained lower mids, and mild high end lift, to give the classic vintage valve bass tone. In position 2 the lower mid is made more prominent whilst simultaneously the upper mids are subtly scooped to give a more aggressive, growling quality to the amplifier's tone. Position 3 introduces a gentle overall mid boost for an immediate, cutting, `in your face' tone with the mids scooped even further to give an immediate, cutting sound. 9. MID FREQUENCY Control Constitutes a semi-parametric equalizer together The Compressor smoothes out your bass sound. As you increase the amount of compression, so you flatten out the peaks in the incoming signal. When the compression reaches its threshold the LED will change to red. The Boost switch increases the gain of the classic channel. When the switch is engaged the whole channel gain is raised making it much easier to get an overdriven sound. 13. VOLUME Control - Classic Channel This control adjusts the volume of the Classic Channel. 16. VOICE Control 3 This control adjusts the response selected by the Voice Shift control. 2 17. TREBLE Control By adjusting the Treble control you can add or take away the higher frequencies in your bass tone. By increasing the amount of treble you will make your tone brighter, ideal for more percussive playing styles. 21. VOLUME - Master (Only on MB450H, MB4210 & MB4410) Controls the overall volume. 3. CD IN Jack Socket ENGLISH BLEND (Only on MB450H, MB4210 & MB4410) You can select a blend of the two channels either from the front panel or via the supplied footswitch. If you want to jam to your favourite CD, tape or mp3 player, merely connect the headphone output of your device here, adjust the player's volume to match that of your guitar and `hey-presto' - you've got the perfect `play-along' practice system. Connect the supplied footswitch here. This enables you to change between Modern and Classic channels. The MB450H, MB4210 & MB4410 have a twin footswitch which also switches the Blend feature. 5. BALANCED LINE OUT The Line Out Jack can be used for connection to recording equipment for direct recording or for connection to a P. A. HEADPHONES Jack Socket This switch turns the channel mixing on. By adjusting this control it is possible to blend your signal between the Modern and Classic channels. When you do this the LED will be illuminated red. For use when silent practice is the order of the day. Connection of headphones will automatically shut down the internal speaker / speaker cabinet. Selects the signal available at the Balanced line out. When in PRE position the buffered and level adjusted input signal is present at the DI output. [. . . ] They accept either a standard 1/4" jack or a SPEAKON® connector and both of them carry the same signal allowing 2 cabinets to be connected simultaneously. The minimum load is 2 Ohms. There is one speaker jack socket on the MB60 and MB150 (marked `INTERNAL 4'). This is where the power amplifier is connected to the internal loudspeaker. It can be used to drive an external cabinet of at least 4 Ohms impedance. * with extension cabinet Safe operating levels: The MB450, MB4210 and MB4410 amplifiers are designed to deliver 450W safely into 2ohm loads. [. . . ]