69 Plexiglas 100W
Headrush Amplifiers

69 Plexiglas 100W

Inspired by Marshall Super Lead Plexi 100W

The model 69 Plexiglas 100W is an amplifier inspired by legendary 100 watt Plexi, designed to offer:

  • Powerful, open and highly dynamic sound
  • High headroom with great touch response
  • Ideal for classic rock, hard rock and blues

Compared to the 50W version, it offers more headroom, firmer bass and more punch, perfect for big, defined sounds.

BluesRockHard RockJazzFunkPopBassClassic Rock

Controls

Treble

Controls the high frequencies:

  • Low → soft sound
  • High → bright and punchy Fundamental for defining attack and presence
Middle

Control the mid frequencies:

  • Low → scooped sound
  • High → more body and presence
  • Key to standing out in the mix
Bass

Control the low frequencies:

  • Low → tight and controlled
  • High → full and deep In the 100W Plexi the lows are more important and present
Presence

Controls the final brilliance:

  • Low → soft sound
  • High → more open and defined Adds air and aggression
High Volume

Controls the level of the

High channel:

  • Low → clean
  • High → crunch and overdrive Main source of saturation
Normal Volume

Controls the level of the

Normal channel:

  • Low → clean
  • High → adds body and warmth Used in conjunction with the High channel to “jump” the sound
Output Level

Controls the final volume:

  • Negative → attenuation 0 d
  • B → neutral
  • Positive → boost Does not alter the timbre

Pro Tips

BEHAVIOR OF THE AMPLIFIER

  • Big, open and very dynamic sound
  • More headroom than the 50W
  • Excellent response to guitar volume
  • High Vol + Normal Vol → blend between shine and body

Advice:

  • High Vol → crunch and attack
  • Normal Vol → adds thickness
  • Presence + Treble → definition and aggression
  • Bass → be careful not to overdo it

Final advice:

  • High Vol + Treble → define the Plexi character
  • Normal Vol → adds body and roundness
  • Presence → makes the sound more “open” and aggressive
  • Perfect for classic rock, hard rock and powerful leads

Setup Examples

Powerful clean / high headroom

Treble50%
Middle45%
Bass45%
Presence50%
High Vol35%
Normal Vol40%
Output Level0dB

Classic rock crunch

Treble55%
Middle50%
Bass50%
Presence55%
High Vol55%
Normal Vol50%
Output Level+1 dB

Powerful lead / hard rock

Treble60%
Middle55%
Bass50%
Presence60%
High Vol70%
Normal Vol55%
Output Level+2 dB