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Andrew Wasson of Creative Guitar Studio answers questions from off of his Guitar Blog website...

Q). Can you explain my pedal board switches called Line Level & Instrument Level?
- Parker - Surrey BC.

A). First, let's begin with a basic understanding of decibels. The level of a signal responds to necessary increases or decreases, related to the type of signal for a specific type of device. For instance, typical audio applications will include; instrument, microphone and line level. Microphones tend to have very low output level. Normally somewhere in the neighborhood of -60db. So, most often we use mic pre-amps with high gain so we can boost the mic's output to correctly interface with mixing consoles. This is also why mic pre-amps need to be of a very good quality so that they have excellent noise specifications. Now, instrument levels like guitars, are around -20db. So, the guitar pre-amp needs to bring up the guitars native level to the 0db level. And, this is why the typical pedal boards & stomp boxes have that instrument level switch. That switch brings the native guitar level up to 0db from -20db. Now, if you're running your pedal through a rack system. That rack system is designed to operate at line level. So, your pedal board needs to be set at line level. And, within your Rack system you wouldn't want a guitar pre-amp inline. If you have another guitar pre-amp in your rack mount system, it's always best to use an A/B switch to go back & forth and keep a better sounding signal chain. Remember it's VERY important to match all your levels correctly to prevent your devices from clipping.

Thanks for writing in.

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