Description

This is a pair of original Bowers & Wilkins C5 Series 2 Drivers.  When being correctly used, this driver can well beat most $150 IEMs on offering a very nature and original sound. 

We recommend using this driver with the genuine wood or Mini-Piano earphone shells to fully explore its potential. 

Know about Bowers & Wilkins C5 Series 2

C5 Series 2 in-ear headphones deliver stunning audio clarity and feature an ingenious adjustable ergonomic design, for a secure fit and a tight acoustic seal.

Features and Specs

See the official spec from Bowers & Wilkins website:

• The impedance – 32 ohm
• CCAW coil
• Drive units 2x ø9.2mm (0.4in) full range
• Impedance 32 ohms
• Frequency range 10Hz to 20kHz
• Distortion (THD) <0.2% (1KHz/1mW)
• Max. input power 3mW
• Sensitivity 115dB/V at 1kHz

Measurement

Measurement is based on an IEC711 coupler, a customized USB sound card and Win10 PC running ARTA Software.

Frequency Response measurement

Notice the bass, mid and treble are perfectly balanced. There is a slightly boost at 3Khz an producing a bright and clear vocal.

The Impulse Response measurement

CSD (Cumulative Spectral Decay), i.e., the waterfall diagram.

Notice the decay rate at 500hz-20Khz is very consistent, meaning less interference among bass, mid and treble.

Burst Decay

Notice the consistency among all the bands

Burst decay

Proceed with caution: dynamic drivers are with extremely fragile (1~5μm) diaphragm and can be easily damaged in following situations.

• Soldering: overheated (>250 degree C) soldering iron or overtime soldering (>2s) may permanently damage the driver. Please heat the driver as little as possible during soldering.
• Installation: the driver has Sintered NdFeB Magnetic inside with extremely strong attraction power. The fragile diaphragm may be damaged by having anything metallic hit it. 
• Gluing: attaching glue either to the diaphragm or the backside holes may greatly alter the sound
• Chemical: Applying any chemical solvent will void your warrant and we will not be able to help you
• Others: applying high-voltage, storing in high temperature/humid environment… all may cause unrecoverable damage.