Marshall Amplification DBS 7400 MODEL 7400 REAR PANEL FUNCTIONS, MODEL 7400 FRONT PANEL FUNCTIONS

MODEL 7400 FRONT PANEL FUNCTIONS.

1. Hi-sensitivity Input

Input for the connection of bass guitars with lower output levels.

2. Lo-sensitivity Input

Input for the connection of bass guitars with higher output levels.

3.Gain Control with Peak LED

Controls the level of input gain.

For optimum signal level the peak LED should light occasionally.

4. Pre-Amp Blend Control

This control fully anti-clockwise routes the signal through purely solid state input pre-amp circuitry. Turned fully clockwise the signal is routed through an ECC83 pre-amp valve circuit. The various positions in between offer numerous combinations of the brighter more percussive solid-state tone with that of warmer more compressed valve tone.

5. Bright Switch

Push switch to add brightness and attack to the top end of the primary EQ.

6. Deep Switch

Push switch to add extra bottom to the low end of the primary EQ.

7. Low Primary EQ Control

Rotary control that gives + or - 15dB cut and boost of the lower end of the primary EQ.

8. High Primary EQ Control

Rotary control that gives + or - 15dB cut or boost of the primary EQ upper frequencies.

9. Compression Threshold Indicator

LED which indicates when the compression threshold is reached.

10. Compression On/Off Push Switch

Push switch which activates the compression circuit.

11. Compression Depth Control

Rotary control for selecting the depth of compression. Note: (This control works in conjunction with input gain control (3)). The input Gain control should be used to set the threshold level and the depth control to select the amount of compression.

12. Graphic Equaliser

9 Band graphic equaliser offering + or - 15dB cut or boost (centre flat) of the frequencies that

proved to be the most effective for bass reproduction in our exhaustive listening tests.

13. Graphic EQ Master Level

Master level slider offering + or - 6dB cut or boost (centre 0dB) of the overall graphic level. This allows the accurate balancing between the levels with or without the graphic switched in.

14. Graphic On/Off Switch and Indicator

Push switch to access or by-pass the graphic with LED indicating on/off status. (The graphic is also footswitchable by any standard on/off footswitch).

For the footswitch to function the front panel switch must be in the ‘On’ position).

15. Volume Control

Rotary control to set the overall output level of the amplifier.

16. D.I. Pre or Post EQ Selection Switch

Selection switch to offer a studio or PA engineer with the choice of direct signal either before or after EQ and compression has been added.

17. Power Switch

On\ Off mains power switch with LED indicator and featuring soft start circuitry to minimise switch on and switch off noise.

MODEL 7400 REAR PANEL FUNCTIONS.

18.Mains Input Connector

For connection to mains power supply.

19.Twin Speaker Outputs

Heavy duty locking type sockets for connection to loudspeakers. The minimum total load is 2 Ohms.

As Dynamic Bass System cabinets are rated at 4 Ohms, combinations of two cabinets provide the optimum load.

20. Graphic Footswitch Jack

Jack socket for the connection of a single On/Off footswitch for the Graphic EQ.

21. Link In Jack

Jack socket to accept the Link output signal from another Dynamic Bass System amplifier when extending the system.

22. Link Out Jack

Jack socket to feed the Link input of another Dynamic Bass System amplifier when extending the system. Note: (The Link in and the Link out jacks are optimised for linking Marshall Dynamic Bass System amplifiers only).

ENGLISH

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