Keep your acoustic guitar sounding like an acoustic guitar through a PA System

ACC1 has one job: To maintain every nuance of your acoustic guitar sound, making it spring to life even when amplified through a PA system – whether you are strumming, fingerpicking or soloing.

Whether you use piezo pickups or built-in or external microphones, this unit will make your guitar sound authentic and blend in perfectly with the band. The built-in studio-quality Compressor makes playing feel effortless and smooth without squashing your sound. 

ACC1 is a scaled-down version of the Acoustic Guitar Unit we developed for Scorpions’ MTV Unplugged Tour in 2014. We took all of the essential features from the 6U 19” monster we built and managed to pack them into a compact 2U 19” rack unit.

It might look a bit complicated, but it is actually very intuitive and easy to operate. In short, this is one killer unit for all of you acoustic players out there.

Proud ACC1-users include amazing players like Matthias Jabs (Scorpions), Rudolf Schenker (Scorpions), Michael Nord Andersson (Roxette), Peter Maffay, Pascal Kravetz (Peter Maffay, Udo Lindenberg) and many more.

“Making an acoustic guitar sound authentic through a PA System may sound easy – it is not!

Playing an acoustic guitar evenly and effortlessly sounds easy – it is not!

It took me years to perfect the sound and the playing aspects… This is one unit I am very proud of!”

Steen Skrydstrup

Steen Skrydstrup

Caveman ACC1 | Fingerstyle with fast Attack on the Compressor

Caveman ACC1 strumming with slow Attack on the Compressor

How we record 

Guitar -> Caveman Audio stomp -> Caveman Audio X2/X3 Amplifier -> Caveman Audio 412 cab.

We use two microphones in front of the cabinet – a Shure SM57 and a Royer R-121.
The microphone signals are sent to the Caveman Audio Dual Mic Preamp and the outputs then run straight into Pro Tools.

The sound you hear has NOT been processed in any way – no additional compression or EQ.
What you hear is simply the raw recorded signal. We add a little reverb and occasionally a bit of stereo delay – but that’s it!

The bass is recorded with a PJ bass guitar straight into the Caveman Audio BAS1 preamp – and from there directly into Pro Tools.

All Acoustic Guitars are recorded with a Martin D28, passing the signal from the onboard piezo pickup straight into the Caveman Audio ACC1 preamp and then directly into Pro Tools.

The drums are Superior Drummer 3 grooves.





  • Dimensions (metric) : 19” x 2U x 350 mm (WxHxD)
  • Dimensions (imperial) : 19” x 2U x 13 3/4″ (WxHxD)
  • Weight: 5 kg / 11 lbs.
  • Power requirements: 100-240VAC 50/60Hz
  • Transformer-balanced Radio/Wireless Input
  • Transformer-balanced DI
  • Transformer-balanced Amp Output
  • Transformer-balanced Tuner Output
  • Remote Foot Switch for Boost ON/OFF, Attack 1/ Attack 2, Mute
  • Unique RFI protection 
  • All Caveman Audio products come with a 10 Year Warranty
  • All Caveman Audio products come in road-ready, zinc-plated steel enclosures


ACC1 Acoustic Preamp
ACC1 Acoustic Preamp

  • Neutrik gold-plated lockable ¼” cable input
  • Transformer-balanced Neutrik gold-plated XLR Radio/Wireless input
  • Transformer-balanced Neutrik gold-plated XLR DI output
  • Transformer-balanced Neutrik gold-plated ¼” TRS output for an external amplifier 
  • Adjustable Input Gain
  • Switchable Boost function with Level Control
  • Studio Quality Hi- and LoPass filters
  • Studio Quality 2-band Parametric Equalizer with bandwidth control
  • Studio Quality Compressor with dual switchable Attack controls
  • Overall Master Volume
  • Mute function
  • Tuner Output
  • Worldwide voltage compatibility



ACC1-Acoustic Preamp-Rack




Additional information

Weight 8 kg
Delivery time

Currently not available

Out of stock


AP1 Acoustic Preamp


Niklas Schneidermann

We met up with guitarist Niklas Schneidermann from Magtens Korridorer in the band's rehearsal room in Copenhagen (September ’21). He kindly showed us his rig and demonstrated some of the settings he uses, when playing live with Magtens Korridorer. Niklas' main piece of gear is his 3 channel tube amp, that he uses for three different types of overdrive sounds.

The amplifier & cabinet

Niklas is an avid Caveman Audio user and has multiple custom-made products from Steen Skrydstrup. Niklas has been playing the VOX AC50 amp for many years. Three years ago he decided to shift to the Skrydstrup TD50 Triple Drive amp. Last year Niklas tried going back to the Vox amp, but quickly realized that after playing the Skrydstrup amp, there was no turning back. - It simply sounds better!

Niklas is getting his dirt sounds from the amp, which has three levels of overdrive. Channel 1 ranges from fat and warm clean tones to gentle overdrive, Channel 2 goes from fast overdrive tones to high-gain bliss, and finally, Channel 3 takes you from a punchy-power-chord type of sound to screaming high-gain lead tones.

The Skrydstrup TD50 Triple Drive is now called Caveman Audio X3 - 3 Channel amp. The name is new, but the amp is the same. The guitar cabinet used is a Caveman Audio 412-V30 Cab.

Niklas Schneidermann-Magtens Korridorer-1
Niklas Schneidermann-Magtens Korridorer
Niklas Schneidermann-Magtens Korridorer

“For the past three years, I have needed to have my Skrydstrup amplifier with me, because it just sounds fantastic - even when I play it!”

-Niklas Schneidermann (Magtens Korridorer)

Niklas’ favorite guitars

Niklas uses a variety of guitars, but mainly uses three types, when playing live with Magtens Korridorer.

His main guitar is the Fender Custom Shop Esquire Telecaster, which has an old beat up look. He also has a spare Fender Custom Shop Esquire Telecaster, this one with fancy gold paint.

Niklas’ latest edition to the guitars, is the Fender Jazzmaster Firemist gold ’65 that he purchased last year.

Also added to the guitars that will be going out on tour shortly, is the Fender Custom Shop LTD 60 Strat Relic in shell pink finish and a rare Vox Mandoguitar from the 60’s.

Niklas Schneidermann-Magtens Korridorer
Niklas Schneidermann-Magtens Korridorer

"Back to basics - just with great sound”

-Niklas Schneidermann (Magtens Korridorer)


Pedals & effects used live

The switching is controlled by the SC1 Midi Foot Controller from Caveman Audio. Niklas appreciates the noiseless switching he gets when using the SC1 controller, opposed to a regular pedalboard. Niklas likes to keep his setup simple and does not have a lot of pedals. These are the pedals that he uses live:

Caveman Audio TRM1 Opto Tremolo

2x Caveman Audio BOS1 Boost 28 booster pedals

Boss DD-5 Digital Delay

Strymon El Capistan Tape Echo

Niklas Schneidermann-Magtens Korridorer
Niklas Schneidermann-Magtens Korridorer

“The great thing about the SC1 Midi Foot Controller, opposed to using a regular pedalboard, is that you can get the sounds from all your favorite stompboxes without all the noise and the hiss”

-Niklas Schneidermann (Magtens Korridorer)


Custom-built products

Niklas is using a Skrydstrup custom-built interface in his rig. When playing live he also uses a Skrydstrup Input Selector as well as a Skrydstrup Acoustic Preamp, to make sure his acoustic guitar sounds right when playing live.

Niklas Schneidermann-Magtens Korridorer
Niklas Schneidermann-Magtens Korridorer

Niklas Schneidermann's Gear