17/18/19. Equalization, Bright Switch

16/20. PRE and POST GAIN

The channel Pre (16) and Post (20) Gain controls operate in the same manner for both channels. However, the Lead channel does have more pregain than the Rhythm Channel. In most applications, the Rhythm channel should be set up with the Pre Gain at the lower “cleaner” settings (0-4) and the Post Gain should be set for overall volume. The Rhythm channel can be converted to a medium distortion channel by activating the Crunch switch (22). This will more closely match the pre gain of the two channels. The Lead channel should be set up with the Pre Gain at the mid to upper settings (5-10) and the Post Gain should be set for overall volume.

17/18/19. EQUALIZATION

The 6505+’s equalization block features passive low, mid, and high EQ that is custom tailored for each channel. Adjusting the control(s) counterclockwise will result in an attenuation of the signal within the frequency band.

21. BRIGHT SWITCH

Activates a preset boost in the treble frequencies (6 dB at 2 kHz) and affects only the Rhythm Channel.

22. CRUNCH SELECT SWITCH

Boosts the gain of the Rhythm channel to create a medium distortion or in between tone. Depress to the “in” position to activate.

23/24. RESONANCE / PRESENCE

Unique to Peavey instrument amplifiers, the Resonance control (23) can be set to boost the gain of the power amp in the low frequencies at the resonance/attenuation point of the speaker cabinet. In simple terms, the Resonance control works like a low EQ to offset low-end frequency drop out. The Presence control (24) works in the same manner, boosting the high frequencies. Experimentation using your particular speaker cabinet, along with personal taste, will determine your setting for these important controls.