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.

NOTE: This model was most likely discontinued. It is very difficult to find for purchase.

  • 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, bend-retaining


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 have slight darkish tonality, but overall it's clear and crisp.

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