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Guided Tour - Front Panel
8. Limiter Control - This determines the amount of compression (peak signal reduction) by
simultaneously adjusting both threshold and compression ratio (which ranges from 2:1 to
infinity [limiting]). At the fully counterclockwise “Zero” position, the circuitry is bypassed
and no compression is applied. As the knob is raised clockwise (at settings from “1” to
“10”), increasing amounts of compression are applied.
9. Limiter LED - Provides a visual indicator of the status of the compression circuitry.
When lit steadily green (for example, when the Limiter knob [see #8 above] is set to
“Zero”), 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 continuous-
ly as different amounts of compression and/or limiting are being applied.
10. Phone jack - Connect any stereo headphone (600 ohms or less) to this standard 1/4"
stereo jack. When a plug is inserted into the headphone jack, the speaker output is dis-
connected, allowing you to use your A Series as a practice amplifier. The level of the sig-
nal sent to the headphones is determined by the setting of the Volume knob—at the point
where a connected speaker would clip, the headphones will clip.
WARNING: Because even the smallest A Series amplifier is capable of generating extreme-
ly high headphone signal levels, always start with the Volume knob at minimum and then
slowly turn it up. In particular, a clicking sound is an indication of distortion and possible
damage to the headphones (and/or your hearing!); don’t let things get to that point!
11. Power switch - Use this to power the A Series on or off. When powered on, an LED
inside this switch is lit.