
69 Blue Line Bass
The model 69 Blue Line Bass is an amplifier designed for electric bass, inspired by classic vintage amps with large headroom, designed to offer:
- Clean, powerful and defined sound
- Deep but controlled lows
- Perfect for funk, rock, jazz and fusion
Includes advanced EQ controls such as Mid Frequency and Ultra Hi/Low, for precise sound shaping.
Controls
Activate or deactivate the high frequency boost:
- Y → brighter and more defined sound
- N → warmer and rounder sound
- Useful for slap and definition on the high strings
Control the high frequencies:
- Low → smooth sound
- High → bright and punchy
- Adjust presence and attack
Controls the mid frequencies:
- Low → scooped sound
- High → more presence and definition
- Fundamental for standing out in the mix
Select the frequency on which the
Mid control acts:
- Low (200–400 Hz) → body and warmth
- Medium (400–800 Hz) → presence and punch High (800–1.5 k
- Hz) → definition and attack Allows a very precise and musical EQ
Control the low frequencies:
- Low → tighter sound
- High → full and deep
- Be careful not to overdo it to avoid a “dough” sound
High frequency boost:
- Low → light effect
- High → very bright and defined sound Ideal for slap and percussive technique
Low frequency boost:
- Low → control
- High → deep, powerful bass Adds weight to the sound
Controls the overall level of the preamp:
- Low → clean
- High → more presence and drive
- Does not introduce significant distortion
Controls the final volume:
- Negative → attenuation 0 d
- B → neutral level
- Positive → final boost Does not alter the timbre, only the volume
Pro Tips
BEHAVIOR OF THE AMPLIFIER
- Clean, powerful sound with great headroom
- Very flexible EQ thanks to MidFreq and Ultra Hi/Low
- Excellent definition even with high low frequencies
- Volume + Output Level → balance the overall level
Advice:
- Mid + MidFreq → essential to stand out in the mix
- Ultra Hi → for slap and attack
- Ultra Low → for depth and weight
- Bright → adds immediate definition
Final advice:
- Mid + MidFreq → key for definition and presence
- Ultra Hi → perfect for slap and modern technique
- Ultra Low → adds depth without losing control
- Bright → immediate attack on high frequencies
Setup Examples
Clean / balanced sound
Funk / slap
Powerful rock/bass
Flea – “Funk Punch”
Description: Funky sound with strong attack and midrange punch. Perfect for energetic Red Hot Chili Peppers style slaps and grooves.
Marcus Miller – “Slap Hi-Fi”
Description: Modern slap sound, very bright and defined, with deep lows and crystal clear highs. Ideal for slap and fusion techniques.
Geddy Lee – “Prog Rock Growl”
Description: Aggressive and mid-range sound, perfect for melodic lines and progressive rock. Maintains definition even in dense mix.
Quick tip:
- Flea → more punch and groove
- Marcus Miller → modern and hi-fi slap
- Geddy Lee → highlighted averages and presence in the mix

