ø9.4mm Dynamic Driver


Decided to dive in into the past of the KZ brand and try the old KZ (GK) C56R. I was quite surprised. These earphones only cost me $5, but they sound excellent, if you can forgive the missing sub-bass. These earphones were made for comfort and vocal-oriented music, using a simple design and common materials. Quite an impressive product.


  • Excellent sound quality, especially in the mids range - clear and warm.
  • Excellent volume levels even without amplification.
  • Super comfortable to wear.
  • The overall build quality is sufficient.


  • The sub-bass is completely missing and the highs are slightly darkened.
  • The cable is stiffer than most other KZ earphone cables.
  • The lack of accessories is quite disappointing.
  • I didn't get the earphones in a retail package.

Package & Accessories


Plastic bag

Ear Tips - Single-Flange:

S+M+L, black, ø4mm bores

Build & Materials


Metal + plastic (matte), ø5mm nozzles, soft strain reliefs


TPE, soft strain relief


TPE, 113cm, soft, mildly bent


Metal, straight, short, soft strain relief

Comfort & Fit

Very comfortable earphones. Their shape offers a firm hold and seal even with the included generic tips, which aren't bad in their own right.

Lows / Bass

The lows are pretty gentle and unemphasized. There's absolutely no sub-bass involved here. Many people may actually appreciate the moderation in the bass response.

Mids / Vocals

The mids and vocals are highly emphasized and upfront. The vocals are tonality darkish and very shouty. Instruments like electric guitars are too harsh and fatiguing.

Highs / Treble

Sharp but not so bright and the level of detail wasn't polished enough. It's crisp but the silent microdetail was left out.

Frequency Response

DT5 ED2/EDR1 ED3 Youth Version ED4 ED9 ED10 ED11 ED16 EDR2 ES3 GR HDS1 HDS2 HDS3 IE80 RX S3 ZS1 ZS5 (V1) ZS6 ZS7 ZS10 ZSA ZSE ZSN ZSR ZST