Bock Audio 251

The vintage 251 is THE vocal sound people ask for, but the original (vintage) versions are 50+ years old and sound very different from one another. Repairing, rebuilding and “nursing” original 251’s along has been David Bock’s work spanning over 30 years. The risk for a modern studio or end user to depend on a vintage mic on a daily basis is increasingly problematic. The BOCK 251 (formerly Soundelux ELUX251) is David Bock’s answer to the vintage mic dilemma of getting “that sound” without the headaches.

What makes the 251 different? The BOCK 251 provides the user with absolute confidence that this is the mic you put in the most critical situations. The BOCK 251 uses a proprietary hand made German capsule, a proprietary hand wound multi sectioned audio transformer, a NOS tube in the mic amplifier, a hand built outboard power supply and a custom low capacitance audio cable. This is one of the best overall mic packages available on the market at any price. The BOCK 251 is the ideal microphone to choose when there is a variety of applications that must met with absolute top recording quality. With frequency response that extends well beyond the normal range of typical studio microphones, the BOCK 251 sets new standards.

For vocals, the BOCK 251 instantly delivers that huge vocal sound you have wanted for years. It sounds equally impressive on females and males. It will capture the most intimate and subtle details of a vocal yet maintain integrity at high SPL’s. It holds up track after track, “sitting on top” in extremely dense mixes without EQ. For instruments, the BOCK 251 offers very high end performance on critical stringed instruments, orchestras, choirs and small ensembles. The outstanding transient response reveals elusive harmonic details that spell the difference between good and great in your recordings.

How do I use it?
The BOCK 251 cardioid pattern shuts off the back of the capsule to deliver extraordinary vocals when worked very close. It is recommended to use a pop filter on less experienced vocalists to enable closer working distances to take advantage of the magical proximity effect. There is no low frequency filtering used on a BOCK 251 so you will hear low frequency content you’ve never heard before.

At distance, the BOCK 251 delivers a level of definition that is amazing. The high end does not fade with distance like so many other condensers and the power and depth of the low end response is a joy to hear. The omni and Figure 8 patterns prove useful in these non-voice applications.

Bock Audio 251 Features :

• No-compromise construction; hand built, hand tuned, strictly tested German capsules
• Time-proven tube and transformer circuitry
• NOS tube in the mic amplifier
• Proprietary hand wound audio transformer
• All electronic components are point to point wired
• Each individual component in every microphone has been pre-screened for sonic quality
• Polar pattern switch on mic
  
• Power supply is true to the original, unregulated supply
• High frequency response that is not only present, but natural with an open, airy top end
• Allows vocals to sound naturally dominant without being overbearing
• Sounds great in all mixing studios and on all systems, before and after mastering

Includes P251 PSU, custom cable between PSU and Mic, “LB PRO Spider” suspension shockmount and wood box.

Bock Audio 251 Specifications :

• Polar Patterns: Cardioid, omni, Figure of 8 Switchable from mic
• Frequency Range: 10Hz to 18kHz, +/-2dB
• Sensitivity: 19mv/Pa
• Equivalent Noise: 18dB (“A” weighted) 32dB (unweighted)
• Distortion vs.SPL @1kHz:
• 112dB = 0.5% THD
• 118dB = 1% THD
• 129dB = 2% THD
• (increasing distortion is non-exponential, nearly linear, and primarily 2nd harmonic)
• Impedance: 200 Ohms true transformer balanced
• Recommended load: 1.2k Ohms
• Dynamic range (maxSPL-"A"noise): 94dB
• S/N (94dB-noise): 76dB “A”, 62dB unweighted
• Capsule size: 1” diameter, dual asymmetrical backplate CK12 type
• Tube type: New Old Stock GE5670 triode
• Power Supply: P251 true linear, factory wired 115v or 230v operation
• Dimensions: 2” dia x 8.5” oal (52x216mm)
• Weight: 1lb 9.3oz (1.58lbs) =716g
• Shipping weight: 12 lbs