Marshall Studio Classic SC20H & SC20C Quick Start Guide

Warning! Safety Instructions

Please read this manual carefully before plugging in. Follow all instructions and heed all warnings.

Warning: Before going any further, make sure that your amp is compatible with your mains electricity supply. If you have any doubt, please seek help from a qualified technician – your Marshall dealer can help you with this.

Mains Input & Fuse

The specific mains input voltage rating that your amp has been manufactured for is indicated on the rear panel of the amp. Your amp is provided with a detachable mains (power) lead, which should be connected to the mains input socket on the rear panel of the amp. The correct value and type of mains fuse is specified on the rear panel of the amp.

Never attempt to bypass the fuse or fit one of the incorrect value or type.

Important Set Up Information

When using your amp with one or more speaker cabinets, make sure that they are connected to the correct loudspeaker jack sockets. Warning: failure to do the above may damage your amp. When connecting a speaker cabinet make sure that you use a proper speaker cable. Never use a screened (shielded) guitar cable for this purpose.
Ensure that the power switch is set to the off position and the standby switch is set to standby.
Connect the supplied mains (power) lead into the mains input on the rear panel first and then into an electricity outlet.
Ensure that any master, volume and/or output level controls on the front panel are set to zero.
Plug your guitar into one of the input jack sockets on the front panel.
Turn the front panel power switch on and wait a couple of minutes.
Select between 20W / 5W using the standby switch.
Turn the volume up to your preferred level and you're ready to play.

Transporting Your Equipment

Please ensure that your amp is switched off, unplugged from the mains electricity supply and all removable cables have been disconnected from your equipment before attempting to move it.

Front Panel Functions

SC20H / SC20C Front Panel Controls:

1. POWER SWITCH: Turns the amp on and off. Illuminates red when unit is turned on.
2. STANDBY SWITCH: Selects power mode: Low (5W), Standby, or High (20W). Use Standby mode during breaks. Always turn the power on for two minutes before using the standby switch.
3. PRESENCE: Adjusts high frequencies of the power amp for more bite.
4. BASS: Adjusts low frequencies for bottom end and depth.
5. MIDDLE: Adjusts mid frequencies for a full or aggressive tone.
6. TREBLE: Adjusts upper frequencies for a brighter tone.
7. MASTER VOLUME: Adjusts the amp's output volume.
8. PREAMP VOLUME: Controls preamp overdrive, input gain, and distortion level.
9. HIGH INPUT: High sensitivity guitar input socket.
10. LOW INPUT: Low sensitivity guitar input socket.

Rear Panel Functions

SC20H / SC20C Rear Panel Connections:

1. SPEAKER OUT (16 Ohm): 1/4” socket for 16 Ohm speaker connection.
2. SPEAKER OUT (8 Ohm): 1/4” socket for 8 Ohm speaker connection. Use with socket 3 for 2 x 16 Ohm cabinets.
3. SPEAKER OUT (8 Ohm): 1/4” socket for 8 Ohm speaker connection. Use with socket 2 for 2 x 16 Ohm cabinets.
4. SPEAKER OUT (4 Ohm): 1/4” socket for 4 Ohm speaker connection. Use with socket 5 for 2 x 8 Ohm cabinets.
5. SPEAKER OUT (4 Ohm): 1/4” socket for 4 Ohm speaker connection. Use with socket 4 for 2 x 8 Ohm cabinets. Warning: never attempt to connect more speakers than rated. Any other speaker combinations may stress the power amp and potentially lead to valve failure. Note: never use this amp without a speaker load.
6. DI OUTPUT: Connects amp to an external recording device or sound desk. Note: includes loudspeaker emulation.
7. LOOP SWITCH: Turns the effects loop on or off, removing it from the signal path when switched off.
8. EFFECTS LOOP SEND: Sends signal to effects loop / outboard equipment.
9. EFFECTS LOOP RETURN: Returns signal from effects loop or outboard equipment.
10. POWER INLET: Mains power lead connection.

Product Specifications

Dimensions:
- SC20H: 240mm (H) × 510mm (W) × 240mm (D)
- SC20C: 460mm (H) × 510mm (W) × 255mm (D)
Weight:
- SC20H: 9.4kg
- SC20C: 14.55kg
Accessories: Power cable ×1, speaker cable (head only) ×1

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