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The Bock Audio 407 (4-ZERO-7) is a high quality cardioid directivity studio condenser microphone utilizing vacuum tube electronics. Made with a custom K47 type capsule.
Tube Condenser Microphone
Bock Audio is known for its for using modern methods and readily available components to build microphones with a sound akin to the great microphones of the past. The 407 continues in that mode by using the Power Supply and Amplifier from the flagship 507 microphone and combining a custom made k47 type capsule to bring the performance of the original 50's era German tube 47 in an all new 407. The Bock 407is a "cardioid only" mic, as the original was used nearly exclusively in cardioid. The 407 comes with a remote power supply and professional spider type shock mount and a special custom 20 foot cable between the mic and power supply.
WHAT MAKES IT DIFFERENT
For about half what you'd expect to pay for a vintage original, with replacement parts and "new-old-stock" tubes that are readily available, the 407 enables a range of sounds and tonal characters previously not available through any other means. The Bock 407 embodies all the most important characteristics of the original while offering consistency, reliability and long term serviceability that is a requirement for today.
HOW DO I USE IT
The 407's primary use will likely be male or female lead vocals due to its signature proximity effect. The original 47 had proximity effect behavior that was part of its sound and why it defined "big vocals". With up to +12dB of boost at 100Hz when used at 1 inch working distance, the 47 signature was "the sound" of many great artists such as Frank Sinatra. Led Zeppelin 1 used a 47 on nearly every vocal track. Tuesday Night Music Club and Cheryl Crowe was a classic application of a 47 for vocals. The key application was then and still is close worked vocals, male or female.
Tube 47's were never really flat even at distance (beyond 18inches) due to its signature head grille sound. Brass instruments were a favorite 47 application (the classic jazz signature of the most famous records from the 1950's) and small ensembles (of nearly any instrumentation) saw the 47 as the "go to" mic. Cello and violin at short distance gain intimacy and acoustic or electric bass will find a perfect warm tone without muffling using the E47C. Individual drums or drum kits will have astounding impact with no overt artificial high end found when using some small diaphragm mics. Solo performers who sing while playing acoustic guitars may be recorded with just this one microphone.
Frequency Range:10Hz to 18kHz, +/-2dB
Equivalent Noise:18dB ("A" weighted) 32dB (unweighted)
Distortion vs.SPL @1kHz:
112dB = 0.5% THD
118dB = 1% THD
129dB = 2% THD
Impedance: 200 Ohms true transformer balanced
Recommended load: 2k Ohms
Dynamic range (maxSPL-"A"noise): 94dB
S/N (94dB-noise): 76dB "A", 62dB unweighted
Capsule size: 1" diameter, single backplate K47 type
Tube type: New Old Stock EF814k
Dimensions: 2" dia x 8.5" oal (52x216mm)
Weight: 1lb 9.3oz (1.58lbs) =716g
Shipping weight: 13 lbs
Power Supply: N470 true linear, factory wired 115v or 230v operation