Common Mxr Pedal Mistakes to Avoid

MXR pedals are reliable and straightforward, but there are real mistakes players make when choosing, using and powering them. Catherine Allen covers the most common errors — from buying the wrong model for the style to incorrect power supply choices — and how to avoid them.

Buying the Wrong Effect Type for the Style

The most common purchasing mistake is selecting an effect type that does not address an actual need. A Phase 90 bought for a metal player who needs more gain adds an effect that will rarely be used; a Carbon Copy purchased without understanding signal chain position creates confusion about why the delay sounds wrong. Before buying from MXR, identify the specific sonic gap in the current setup — not the effect that seems interesting or that a favourite artist uses out of context.

Incorrect Power Supply Choices

A significant proportion of reported MXR reliability problems reported online are not pedal faults — they are power supply issues. Using an unregulated, shared-ground or incorrect-voltage power supply causes hum, noise, unexpected behaviour and, in some cases, component damage. A unit requiring 9V DC centre-negative should be powered by exactly that. A pedal specifying 18V (the Carbon Copy Deluxe is one example) should not be connected to a 9V supply. Investing in a quality isolated multi-output power supply — the MXR DC Brick or equivalent — eliminates the majority of power-related problems.

Ignoring Signal Chain Order

Signal chain order determines how each effect interacts with the others. Standard conventions exist for good reason: compression before overdrive preserves dynamics; modulation after delay produces cleaner trails; distortion before time-based effects keeps the delay and reverb clean. Placing an overdrive after a delay pedal, for example, distorts the delay trails — an unmusical result in most contexts. Beginners who connect multiple pedals without understanding signal chain order often conclude that the effect unit is at fault when the issue is placement.

Setting Controls at Extreme Positions

Every MXR effect is calibrated so that its most useful settings are in the middle of the control range. A Phase 90 at maximum speed creates a rapid, artificial tremolo effect that is rarely appropriate. A Dyna Comp with sensitivity fully clockwise produces extreme compression and loss of dynamics. The Carbon Copy at maximum mix (effect fully up, dry signal reduced) produces an incoherent wash of delay. Start any new MXR pedal with controls at twelve o'clock and adjust in small increments; the musical range of most MXR designs is within twenty degrees either side of centre.

Not Updating Firmware on Digital Models

Older MXR models are fully analogue with no firmware — but recent digital additions to the range (certain delay and multi-effect units) include firmware that receives updates addressing bugs and adding features. Players who purchase these models and never check for updates may miss improvements. The Dunlop website lists firmware updates for applicable MXR products. This applies to a minority of the range but is worth checking on any recent MXR purchase that includes digital processing.

Bottom Line

The most avoidable mistakes are buying the wrong effect type, using an incorrect power supply and misunderstanding signal chain order. A well-chosen MXR pedal for a specific sonic need, powered correctly and placed appropriately in the signal chain, is one of the most reliable effects purchases available. For guidance on which model to buy, the buyer's guide covers the decision criteria in detail.

Frequently Asked Questions