ACS Evolve Classic Custom IEM

Technical Specification

Drivers : 3 Knowles Balanced Armature Drivers: Single Low, Single Mid, Single High
Crossover : 3-way crossover
Input Sensitivity : 119.9db @ 1Khz
Frequency Response : 20hz-20Khz
Impedance : 48ohms @ 1Khz
Noise Isolation : Approximately a 30dB reduction of ambient noise
Input Connector : Straight 3.5mm Gold-Plated
Ambient Feature : No
Custom Fit : Yes
Also available in Universal fit : No


  • Patent pending IRIS and exclusive SSI technology
  • Built from 40 Shore medical grade silicone finished with a hard wearing flexible lacquer
  • Detachable cable with 2-pin connection and memory ear hook
  • Cable Length 1.3m

The Evolve is the ultimate reference quality, high-fidelity in-ear monitor. With well-defined low end, incredibly detailed midrange and accurate highs with no harmonic distortion, together with our exclusive Sound Stage Imaging (SSI) technology, the Evolve has a reliable flat frequency response. The Evolve is every musicians’ dream with pro-audio reliability and performance.

If you are looking for a well-balanced completely versatile in-ear monitor, the Evolve is the one for you.

Please note: To manufacture your custom-made, bespoke fitting IEMs we require impressions of your ears. Our ear impression service is available throughout the UK and is provided free of charge with your purchase with one of our recommended trade partners. Manufacture times can vary dependent on demand.

Click here for the colour swatch


  • Music



    Order Notes

The cable fitted to your ACS monitors is of the highest quality. Manufactured to our own specification, each cable contains 80 strands of 100% oxygen free copper with each strand plated in pure silver. Aramid fibres (Kevlar) are woven into the twists to provide exceptional pulling strength and breaking strain. The sheathing on the cable is treated to dismiss harmful UV rays and will not discolour or oxidise like many other inferior cables. The design of the cable provides the best connectivity between your audio source and the earphones. When the cable is fitted at the factory it has optimum contact to the cable socket, therefore we strongly recommend that you don’t disconnect the cable unless it requires replacing.

Accessories Included

  • A personalised presentation box with ACS Carry Case
  • ACS Revivo – Portable Electronic Dryer & Sanitiser
  • ACS Wax Removal Tool
  • ACS Comfort Cream
  • 3.5mm to 1/4″ Step-Up Adapter
  • Care and Usage Instructions


  • Have your name or other text lasered on to each side (Up to 10 characters including spaces).
  • Custom In-Ear Monitors are made in clear silicone as standard or you can choose an optional colour

Care and Maintenance

We make our in-ear monitors with pride and like all things worth having, they are worth looking after. Just follow these simple rules and you should receive many years of trouble-free service.

  • Check the sound ducts after each use and use the wire pick supplied to remove any ear wax that has made its way into the tubing.
  • Never use the cables to remove your in-ear monitors – this will eventually put strain on the connector and will damage the cable or socket.
  • Ensure moisture from either humidity or sweat is removed straight after use. We supply silica gel and a zip up pouch for this purpose. We recommend using your ACS Revivo Dryer and Sanitiser after each use.
  • Finally, read the instructions supplied.


Looking for other amazing in-ear monitors? Check out ACS Emotion Classic Custom IEM & ACS Emotion Universal IEM.

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