Electro-Harmonix Q-Tron vs MXR Phase 90
Envelope filter wins for automatic, dynamics-responsive wah character — it triggers on pick attack rather than foot movement, ideal for funk and rhythm playing where both hands are occupied. Phaser wins for rhythmic, musical modulation that moves at a set rate regardless of pick dynamics — consistent movement that suits both rhythm and lead without pick-sensitivity.
Electro-Harmonix Q-Tron
An auto-wah triggered by pick attack rather than a treadle — the harder you pick, the more the filter opens. The sound of Bootsy Collins, Parliament-Funkadelic, and electric funk guitar without needing a foot to control it.
Funk, soul, R&B — auto-triggered wah response that rewards dynamic picking without requiring hands-free foot operation
MXR Phase 90
Four-stage all-analog phaser with a single Speed knob — the swooping phase effect of Van Halen's early records. Eddie Van Halen's Phase 90 at Speed 4 is one of the most iconic pedal tones ever recorded.
Classic rock, psychedelic, blues — subtle swooping phase texture that adds movement without overwhelming the tone
Tone Character
Electro-Harmonix Q-Tron
- ✓ Automatic expression — responds to pick dynamics
- ✓ No foot operation required
- ✓ Very organic response when dialled correctly
- ✓ Wide sweep range and Q control
- ✗ Harder to dial in than a standard wah
- ✗ Effect character changes with guitar output level
- ✗ Different response per pickup — needs readjustment when switching
- ✗ Less precise control than manual wah
MXR Phase 90
- ✓ Simple one-knob operation
- ✓ Very musical, not overpowering
- ✓ Works on clean and dirty signals
- ✓ Iconic EVH-approved tone
- ✗ No mix/depth control
- ✗ Single speed range limits extreme settings
- ✗ No expression pedal input on standard model
- ✗ Effect depth fixed at 100%
When To Choose Each
Funk, soul, R&B — automatic filter sweeping triggered by pick dynamics, leaving both hands free for playing.
Rock, classic rock, blues, indie — set-and-forget modulation that adds movement and depth without depending on picking dynamics or foot operation.
Final Verdict — Electro-Harmonix Q-Tron vs MXR Phase 90
Best for beginners
MXR Phase 90
MXR Phase 90 scores higher on versatility (72/100) and lower on gain (0/100) — a more forgiving starting point than Electro-Harmonix Q-Tron.
Best for metal tones
Electro-Harmonix Q-Tron
Electro-Harmonix Q-Tron leads on gain (2/100) and bass response (50/100) — the two tonal pillars of metal playing.
Best value
MXR Phase 90
At £89 vs £99, MXR Phase 90 delivers 10% cost savings. The tonal trade-off is meaningful.
Specification Summary
| Electro-Harmonix Q-Tron | MXR Phase 90 | |
|---|---|---|
| Price | £99 | £89 |
| Category | Filter | Modulation |
| Gain | 2/100 | 0/100 |
| Warmth | 48/100 | 55/100 |
| Treble | 62/100 | 50/100 |
| Bass | 50/100 | 50/100 |
| Versatility | 62/100 | 72/100 |
| Best for | Funk, soul, R&B | Classic rock, psychedelic, blues |
Not sure which to choose?
Use the Rig Builder — tell it your genre, budget and playing style and it will recommend the right gear for you.
Build My Rig →