PK 1

PK 1

Ultimate traditional earphones
Hifi headphone grade sound stage
Transparent, smooth sound
Comfortable traditional design, NOT in-the-ear
Ultra low distortion, high impedance for hifi or professional monitor
PK1 earphones are the ultimate traditional design with top sound quality. Driving by a head-amp, or even some high output portable audio like Ipod or Iriver, this monster can give you a feeling as top grade hifi headphones, not like average tiny earphones at all.
System includes
PK1 earphones
1/4" stereo phone adapter plug
Foam eartips
Storage boxs
Cord length: 6ft
Y Cord
Technical Details
Impedance:150?0ohm(at 1KHz)*
Frequency response: 20-24,000Hz
Sensitivity:109?dB(at 1KHz)
Distortion: less than 0.1%
*Head-amp or high output portable audio required

PK 2

PK 2

PK2: Low impedance YUIN earphones
Hifi headphone grade sound stage
Transparent, smooth sound
Comfortable traditional design, NOT in-the-ear
Ultra low distortion, low impedance for high grade portable audio

PK2 earphones are the low impedance version of PK1. Although not as good as PK1, PK2's sound signature is similar to PK1. You don't have to drive PK2 with an expensive head-amp. If you are looking for something with high performance/price ratio, PK2 might be the best choice.
System includes
PK2 earphones
1/4" stereo phone adapter plug
Foam eartips
Storage boxs

PK 3

PK 3

System includes
PK3 earphones
1/4" stereo phone adapter plug
Foam eartips
Storage boxs
Details
Impedance:32±20ohm(at 1KHz)*
Frequency response: 15-20,000Hz
Sensitivity:120±3dB(at 1KHz)
Distortion: less than 0.1%
5 feet Y cord