Adventures In Audio

Electric guitar - compress before the amp, or after?

LEARN AUDIO ONLINE ► FREE TRIAL ►

Compression before the amp and compression after the amp provide distinctly different sound textures. So which should you choose and use?

Here is an excellent question sent in by an Audio Masterclass website visitor...

I like to use compression on my guitar tracks and achieve this through one of two methods. I either mic the guitar cab and have my guitar running into a Carl Martin compressor pedal and then into the amp so the guitar signal is compressed before it reaches the amp, or I just mic the cab without compressor, and then take the recorded guitar track and compress it afterwards. Is one method better than the other? What would most pros do in this situation? Compress in the signal path or compress the whole track after the recording?

The 'most pros' that you mention would either audition both methods in the context of the track they were working on, or use their prior experience to decide what to do. That's that part of the question easily answered.

But why might you choose to compress the guitar before the amp? Conventional wisdom suggests that if you record a clean track, you can compress it later. If you compress first, you can never get back to that uncompressed sound, if you feel you need it.

But there is a HUGE difference here...

Without compression, the amp will impress its character mostly upon the peak levels of the signal. But with compression, the average level going into the amp will be higher, therefore the amp has more to chew on. This is very different to the sound of compressing after the amp.

Years (er, decades) ago I had a strange recording chain of my own...

I would connect my Fender Stratocaster to an Alesis Microverb digital reverb unit, set to zero reverb. I was in effect using the Microverb as a high-impedance preamp and nothing more.

I would connect the output of the Microverb to a Drawmer DL221 compressor, the standard workhorse compressor over many years of recording. The output of that in turn connected to a tiny Fender Champ amplifier, which I would mic up. I can't remember which mic I used.

I used to love that sound, and the only reason I don't do it now is because it's easier to do it in the DAW. I'll choose a compressor plug-in followed by an amp emulator.

But recording guitar the traditional and 'purist' way through a pedal, amp and speaker cabinet is undoubtedly a great way to work. So yes - compression pedal, a lovely warm tube amp, a speaker cabinet wth maybe a classic Celestion drive unit. It's going to sound amazing!

Try it out and tell me what you think! P.S. Send examples.

Friday September 11, 2020

The Audio Masterclass Music Production and Sound Engineering Course

FREE TRIAL

Ready to take your recording to the next level? Take a 30-day FREE TRIAL of the Audio Masterclass Music Production and Sound Engineering Course - Our most popular course.

Like, follow, and comment on this article at Facebook, Twitter, Reddit, Instagram or the social network of your choice.

David Mellor

David Mellor

David Mellor is CEO and Course Director of Audio Masterclass. David has designed courses in audio education and training since 1986 and is the publisher and principal writer of Adventures In Audio.

Audio Masterclass gives you all the technical knowledge and skills to bring your musical dreams to life

The Audio Masterclass Music Production and Sound Engineering Course

Get the most from your studio with the Audio Masterclass Music Production and Sound Engineering Course.

Learn more...

Learn Pro Tools with our amazing range of video courses

Pro Tools video course catalog

Browse Pro Tools courses...

Learn Logic Pro with our amazing range of video courses

Logic Pro video course catalog

Browse Logic Pro courses...

Learn Cubase with our amazing range of video courses

Cubase video course catalog

Browse Cubase courses...

Audio Masterclass gives you all the technical knowledge and skills to bring your musical dreams to life

The Audio Masterclass Music Production and Sound Engineering Course

Get the most from your studio with the Audio Masterclass Music Production and Sound Engineering Course.

Learn more...

More from Adventures In Audio...

Making a perfect sine wave and animating it

Graphic equalizer demonstration using the Waves GEQ Classic

Harmonic enhancement: In the master or individual tracks? (Can you hear the difference?)

What will happen if your snare drum clips?

EQ demonstration HF bell boost

How much bass can a Bluetooth speaker produce?

One weird trick for monitoring your mix on a Bluetooth speaker

Can a preamp's pad work as a pop filter

Get the sound you want from the tools you have

What is the phase button for on a microphone preamplifier?

Choosing studio monitors - Is it your most important buying decision?

What is a channel strip? Why should you use one?

Audio effects explained - A quick guide for beginners

How to choose the best key for your song

The amazing stereo effect that no-one can hear

What is the best studio microphone?

Bad Audio Diary BAD 9: What's wrong with this picture?

Weird and wonderful sounds using the Air Music Tech Chorus plug-in

The end of latency?

An investigation of the pre-delay parameter of the Lexicon 480L reverb plug-in

Add reverb to your recordings using the natural echo chamber technique

Why you should ventilate your home recording studio

Q: What is your main concern if your interest is voice over?

Why do microphones sound different?