Guided Tour - Front Panel
6. Bright - This control provides approximately 20 db of boost at 8 kHz, with a peak (bell)
curve. When the knob is at the 12 oOclock (O0�) position, there is no boost or attenuation
(that is, flat response). As it is turned clockwise from the O0� position, the frequency area
is boosted; as it is turned counterclockwise from the O0� position, the frequency area is
attenuated. For more information, see the OUsing Equalization� section on page 11 in this
manual.
7. 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 OZero� position, the circuitry is bypassed
and no compression is applied. As the knob is raised clockwise (at settings from O1� to
O10�), increasing amounts of compression are applied.
8. Limiter LED - Provides a visual indicator of the status of the compression circuitry.
When lit steadily green (for example, when the Limiter knob [see #7 above] is set to
OZero�), 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 Ofollows� the incoming signal, changing continu-
ously as different amounts of compression and/or limiting are being applied.
9. CD Input - Your A Series amplifier features a CD input which you can use with a
portable CD player, cassette, mini disk or MP3 player. You can use the CD input to jam
with pre-recorded tracks or to learn a riff from a favorite recording.
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 knobNat 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!); donOt 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.
5 |