Manual Ampeg SVT450H (page 4 of 8) (English)

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The Front Panel

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1. 0dB (INPUT): The signal output from an

instrument (active or passive) or a line level

signal may be connected here by means of a

shielded instrument cable.

2. PAD: This switch, when depressed, atten-

uates the input signal by 15dB. Attenuation

allows the Gain control (#4) to be used in a

more usable (higher) position. If clipping is

indicated with the Gain control way down,

attenuation is needed.

3. PEAK: This LED illuminates when the sig-

nal level into the preamp (excluding the

Graphic EQ) approaches clipping. Adjust the

Gain control (#4) until a strong signal from

your instrument causes this LED to flicker.

NOTE: If the LED illuminates frequently with

the Gain at a low setting, use the Pad (#2) to

attenuate the signal and readjust the Gain.

4. GAIN: Use this control to adjust the level

of the signal entering the preamp stage.

Adjust this control until the Peak LED (#3)

flashes on strong signal peaks (but is not illu-

minated constantly while playing). To obtain

the best signal to noise ratio, set the Gain

control as described above and adjust the

Master control (#8) to obtain the desired vol-

ume level.

5. BASS: Use this control to adjust the low

frequency level of the amplifier. This control

provides 15dB of cut or 13dB of boost at

40Hz. The low frequency output is flat at the

center position.

6. ULTRA MID: Use this control to adjust the

midrange frequency level of the amplifier.

This control provides 13dB of cut or 5dB of

boost at 400Hz. The midrange frequency

output is flat at the center position. Rotate

the control counter clockwise for a “con-

toured” sound (more distant, less midrange

output) or clockwise for a sound which really

cuts through.

7. TREBLE: Use this control to adjust the

high frequency level of the amplifier. This

control provides 21dB of cut or 16dB of

boost at 8kHz. The high frequency output is

flat at the center position.

8. MASTER: Use this control to adjust the

overall output level of the amplifier. For the

lowest possible noise level, adjust the Gain

control as described in #4 and use this con-

trol to obtain the desired volume level. The

Effects Loop and Balanced Out (#20 - 24)

are not affected by the Master control.

9. LIMIT: The SVT450H uses an internal

Optocoupler Limiter to assist in keeping the

amplifier’s output “clean” at extreme volume

levels. (All amplifiers may begin to clip their

output signals as they approach maximum

output levels, resulting in potentially damag-

ing distortion.) To engage the Limiter,

depress this switch. The adjacent LED illu-

minates when the limiter circuit is activated,

indicating that the amplifier is nearing full

output and the limiter is keeping peak signals

from clipping the output.

10. EQ ON: This switch, when depressed,

activates the Graphic EQ. The adjacent LED

illuminates when the EQ is active.

11. GRAPHIC EQUALIZER: Use these slid-

ers to control the amplitude of the frequen-

cies indicated below each control. The cen-

ter position of each control is flat: sliding the

control upward increases the output level of

that frequency; sliding the control downward

decreases it.

12. ON: This LED illuminates when the

amplifier is on.

13.POWER: Use this switch to turn the

amplifier on (top of the switch depressed)

and off (bottom of the switch depressed).

SVT450H Bass Amplifier

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Ampeg SVT450H Manual

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