The new Bock/Cardas elliptical capsule design strives to resolve the chronic in-band resonance issues of both large and small diaphragm microphones. Round capsules have a relatively low frequency in band resonance, typically around 1K. Small diaphragm mics usually have a much higher in band resonance, typically about 15K or higher. The elliptical capsule offers the best of both, avoiding the constant distance "edge to center" of round capsules, reducing in band resonances dramatically and expanding the application possibilities. The ZERO capsule also has many conventional attributes such as the time tested 6 micron gold sputtered diaphragm used in the BOCK 251 and edge termination design. The capsule is hand built in very small quantities in Germany.
The 5-ZERO-7 also offers many other unique features. A large body microphone, it uses a 3 layer headgrille to prevent moisture (and therefore dirt) from becoming a continuing issue in the sound and long term life of the capsule and microphone. A unique tube mic amplifier was designed of very high gain, vintage 47 inspired, with David Bock hand selected parts. No negative feedback or filtering is used in this microphone to affect sound in any way. An extraordinary US handmade BOCK design four section transformer is employed to complete the audio path.
The custom BOCK power supply is designed just for this microphone and combines the best of the old with new and modern parts. It is a special inductor based design, something not seen in modern production microphones today. It offers the best combination of long term power, low noise floor and high end mic sonic performance.