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Guided Tour - Model 3500/5500 Front Panel
1. Passive Input jack - If your bass guitar has passive circuitry, connect it to the
Model 3500/5500 here. This standard, 1/4” unbalanced jack provides a high
impedance (100 k Ohms) input sensitivity of 20 millivolts.
2. Active Input jack - If your bass guitar has active circuitry,* connect it to the
Model 3500/5500 here. This standard, 1/4” unbalanced jack provides a high
impedance (100 k Ohms) input sensitivity of 60 millivolts.
3. Pre-Amp A (Tube) control - This determines the amount of preamplification
being provided by special circuitry which delivers the sound of a classic tube
amplifier (this circuitry actually includes a real tube!). Note that when both Pre-
Amp knobs are used at equal settings, the amplifier will be twice as loud as when
only one is used. Avoid setting both Pre-Amp knobs on maximum (“10”), since
the result will almost always be undesirable distortion.
4. Pre-Amp B (Solid State) control - This determines the amount of preamplifica-
tion being provided by special circuitry which delivers the sound of a solid state
amplifier. Note that when both Pre-Amp knobs are used at equal settings, the
amplifier will be twice as loud as when only one is used. Avoid setting both Pre-
Amp knobs on maximum (“10”), since the result will almost always be undesir-
able distortion.
5. Compression LED - Provides a visual indicator of the status of the compression
circuitry. When lit steadily green (for example, when the Compression knob [see
#6 on the next page] is set to “Off”), no compression is being applied. When unlit,
compression is being applied to the incoming signal at a ratio of approximately
2:1. When flashing red, the compression ratio is approaching infinity (limiting is
being applied to peak signals). When lit steadily red, the entire signal is being
limited. This LED “follows” the incoming signal, changing continuously as differ-
ent amounts of compression and/or limiting are being applied. For more infor-
mation, see the “About Compression” section on page 12 of this manual.
* Bass guitars that have active circuitry normally require a battery for the circuitry to
be functional.
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ENGLISH
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