FRONT PANEL DESCRIPTION

Feature #1 Feature #2 Feature #3 Feature #4 Feature #5 Feature #6 Feature #6 Feature #7 Feature #7 Feature #8 Feature #8 Feature #9 Feature #10 Feature #10 Feature #11 Feature #11 Feature #12 Feature #13 Feature #14 Feature #15 Feature #16 Feature #17 Feature #18 Feature #19

Click on a number for more information

  1. Acoustic INSTRUMENT INPUT: is a stereo 1/4"" TRS (Tip-Ring-Sleeve) INPUT jack for use with any acoustic instrument with two pickups; however, also accepts instruments with only one pickup. When using a mono cable, signal is routed to the TIP selected by the Input Wiring Switch.
  2. MIC & PIEZO pickup input OVERLOAD indicators: An individual red indicator for each type of pickup. Useful in monitoring pickup level and initially in setting PICKUP GAIN TRIM controls. These indicators light approximately 4 dB before actual clipping, so occassional flickering is okay, but they should never be allowed to light steadily.
  3. PHANTOM POWER indicators: are either Off=no Phantom Power; Yellow=+15 VDC Phantom Power; or Green=+6 VDC Phantom Power.
  4. Input wiring switch: allows choice of Input wiring. Either TIP=PIEZO and RING=MIC, or vice-versa. Proper setup requires careful selection—if in doubt, consult the technician that wired your instrument for the correct choice.
  5. Input PICKUP GAIN TRIMS: set the proper Gain for each pickup. Range is from 6 dB minimum to 60 dB maximum.
  6. PICKUP INVERT switches: Invert the polarity (phase) of the piezo pickup with respect to the mic pickup. Either MIC or PIEZO PICKUPS may be individually Inverted.
  7. LOW CUT frequency: adjusts the corner frequency of the LOW CUT (high-pass) filter from 15 Hz to 250 Hz. Use to reduce unwanted low frequencies in either MIC or PIEZO PICKUPS.
  8. 7-band graphic equalizer boost/cut controls: Seven sliders that control the amount of boost/cut for each of the indicated bands in both MIC and PIEZO sections. A grounded center detent guarantees flat response for filters not used.
  9. PIEZO PICKUP output LEVEL: adjusts the Level of the PIEZO OUTPUT jack. Located post-LEVEL and pre-PAN, so it is dependent on the position of the PIEZO PICKUP LEVEL control and independent of the PIEZO PAN control.
  10. PAN control: Separate controls for both PIEZO and MIC PICKUP sections allow routing the signal anywhere from A-only to B-only at the Main Output.
  11. LEVEL controls: Separate PIEZO and MIC LEVEL controls the overall Level of each signal.
  12. SEND A/B controls: adjust the amount of signal at each of the SEND jacks.
  13. RETURN control: is a “stereo” Return. Controls the amount of A and B entering the RETURN jacks.
  14. MAIN OUT MUTE button: Mutes both A and B Main Outputs. Does not affect the Headphone Output. The red LED indicates a Muted output.
  15. MAIN OUT A & B LEVELS: Concentric controls used to separately set the Main A & B Output Levels.
  16. MAIN OUT OVERLOAD indicator: monitors both A and B Main Outputs. An overload condition (within 4dB of clipping) on either Channel causes this red LED to light.
  17. HEADPHONE LEVEL: controls the volume of the HEADPHONE Output jack.
  18. POWER indicator: glows yellow when the proper power supply is connected and powered.
  19. Headphone jack: Accepts standard stereo headphones rated from 32-600 ohms equipped with a 1/4" TRS plug.

AKG Micro-Mic Users
The Phantom Power requirement for these mics demands a minor modification to the inside of the AP 13. Remove the top and bottom covers and replace R220 with a 15k ohm resistor (see manual). Once modified with the new resistor, the input will not be compatible with other mics.