Guitar Amps and Effects for Dummies by Dave Hunter

Author:Dave Hunter [Hunter, Dave]
Language: eng
Format: epub
Tags: Music, Musical Instruments, Guitar, General
ISBN: 9781118900000
Google: TSdGBAAAQBAJ
Publisher: John Wiley & Sons
Published: 2014-08-11T07:00:00+00:00

Effects loops

Many contemporary amps carry an effects loop (often abbreviated as FX loop), which consists of a patching-in point of sorts between the preamp and the output stage. Two jacks on the back panel, usually marked Send and Return, let you run the signal from your amp’s preamp out to an external effects unit, then back in again for final amplification by the amp’s output stage. Some amps have a footswitch for turning the loop on and off, whereas others are just on all the time when you plug an effect into them.

Some effects loops are buffered, meaning they have a tube or solid-state preamp of their own to drive and condition the signal to help it make the journey out to your effects and back in good, clean shape, usually with a level control to determine the strength of the signal and prevent distorting the input of the effects unit(s). Others are simply passive insertion points in the amp’s circuit. Loops come in two different major categories:

Series or serial loops send the entire signal from the amp’s preamp and EQ stages out to your effects. These loops are usually simple, giving you no control over the balance of wet to dry (effected to uneffected) signal that returns to your amp, other than any depth or mix controls on the effects themselves.

Parallel loops split the signal to send one uneffected leg straight to the amp’s output stage while sending one out of the loop. These usually include a mix or balance control that you can use to determine how much signal goes out to the effects and how much goes straight on its way (see Figure 8-15).

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