블루계열에서 표준인 정확한 부품인 786 정밀 Mic 프리엠프는 최상의 notch 특성군들을 포함한다. 이 특성의 시작점에 dbx로부터 또다른 혁신이 있다. ? 트랜스포머 커플, 이산적인 설계, 우리의 독점적인 M8 Mic Preamp Module을 이용하는 프리미엄 입력 단계
이 dbx 독점은 완전히 어떤 더해진 채색도 없는 투명한 게인과 130dB의 놀라운 다이내믹 래인지를 공급해준다. 48V의 팬텀 파워와 위상 반대 스위치에다가, 786은 주파수 절단40KHz 까지 끌어올림을 가진 dbx의 특허를 가진 펜딩 스펙트럼 이퀄라이저 회로를 특징으로 한다. 스펙트럼 회로는 위상 보전을 하는 동안, 고주파 스펙트럼 신호들을 높여준다는 점에서 유일하다. 스펙트럼의 자세한 제어는 스펙트럼 제어에 의해서 결정되는 주파수에서 고주파 보호 상승의 수치를 다양하게 해준다. 이 프펙트럼과 자세한 제어는 더해진 전통적인 고주파 EQ 토폴로지의 해쉬(hash)없이 본래의 고주파 조정을 가능하게 해준다. 다른 특징은 10에서 60dB사에서 게인을 맞추는 2위치 거친 게인 스위치를 포함한다. 정밀한 게인 제어는 ?5에서 5dB아세서 다양하게 해준다. 레벨은 조정가능한 참조 레벨을 가지고 Vu미터에서 모니터 될 수 있다. 그것이 충분하지 않다면, 786은 역시 30dBm을 초과하는 최대 드라이브 레벨을 유지하는 동안 600옴으로 종단처리된 Belden 8451 케이블을 가지고 1000feet의 드라이빙이 가능한 우리의 독점적인 높은 출력 드라이브 회로와 협동한다. 786은 당신의 기대를 넘기 위해서 충분한 비전과 선견을 가지고 설계되었습니다.

The craftsmanship of the 786 is as stunning as the engineering is innovative. A striking blue front panel machined from 1/4" aircraft aluminum, hand-crafted solid aluminum knobs, LEDs mounted individually in machined stainless steel housings, custom VU meters with peak indicators, and heavy gauge chassis solidify the 786 as the benchmark preamplifier for decades to come. The 786 combines the best preamplifier features and an absolutely pristine audio path. In addition to having 48V phantom power as well as a phase reverse switch, the 786 also features a patent-pending EQ circuit called "spectrum" with frequency cut and boost up to 40kHz. An 11-position coarse gain switch sets the gain between 10 and 60 dB, while the fine gain control varies between -3 and 3 dB. Levels may be monitored on peak-program VU meters with adjustable reference levels. The signal path consists of a transformer-coupled, discrete-design premium input stage utilizing the proprietary dbx M8 Mic Pre-Amp Module.

"Spectrum", a unique variable high-frequency equalization circuit employed in the mic pre-amp enhances the high frequency spectral content of the signal while maintaining phase integrity. The "Detail" control varies the amount of high frequency shelving boost at the frequency determined by the Spectrum control. The combination of the Spectrum and Detail controls allow pristine high frequency equalization adjustments without the added "hash" of traditional high-frequency EQ topologies. Premium active electronics, precision 0.1% and 1% metal film resistors, great sounding temperature stable polypropylene capacitors, high-reliability board-to-board connectors with gold-palladium-nickel contacts, Jensen® transformers, gold plated Neutrik® XLRs, rare earth magnet relays with gold contacts in a hermetically sealed nitrogen environment, military grade glass epoxy circuit boards, to mention a few, contribute to the most technologically advanced preamplifier in the world.

INPUTS
Connectors: Female XLR Pin 2 hot
Type: Transformer balanced/unbal
Impedance: 1.44k ohm, 20 Hz to 20 kHz
Optimum Microphone Impedance: 150 ohm or 20 ohm with Super Low Z switch engaged
Maximum Input Level: > 13 dBu or > 33 dBu with 20 dB pad engaged
CMRR: > 115 dB at 60 Hz, > 110 dB at 1 kHz, > 75 dB at 10 kHz CMRR with 10 ohm imbalance in one leg of input XLR with 150ohm
Source impedance: 90 dB at 60 Hz, > 65 dB at 1 kHz, > 55 dB at 10 kHz

OUTPUTS
Connectors: Male XLR Pin 2 hot
Type: Transformer balanced/unbal, RF filtered
Impedance: Balanced 40 ohm, unbalanced 20ohm
Maximum Output Level: Balanced typically 30 dBm (into 600 ohm). Unbalanced (with UNBAL switch engaged) typically 24 dBm (into 600 ohm).

SYSTEM PERFORMANCE
Course Gain Control: 15 dB to 65 dB voltage gain in 5 dB steps
Fine Gain Control: Additional -5 dB to 5 dB voltage gain
0.1 dB Bandwidth: 20 Hz to 20 kHz 0/-0.1 dB
Frequency Response: Hz to 200 kHz 0/-3.0 dB
EIN: Typically -128 dBu, 150ohm source impedance, unweighted, 20 Hz to 20 kHz measurement bandwidth
THD Noise: 0.005% typical at 4 dBu out, 1kHz, 35 dB gain.
0.0009% typical at 24 dBu out, 1kHz, 35 dB gain.
IMD: <0.007% SMPTE 4:1, 35 dB gain
Deviation From Linear Phase: < 2.0 degrees, 20 Hz to 20 kHz
Interchannel Crosstalk: Typically -105 dB, 20 Hz to 20 kHz

EQUALIZER
Shelving Frequency: Sweepable from 5 kHz to 40 kHz
Gain: Sweepable from -infinity to 16 dB
Slope: Selectable; 6 dB/octave or 12 dB/octave

OPTIONS
Digital output module: 704X

POWER SUPPLY
Operating Voltage: 100VAC 50/60Hz 120VAC 60Hz
220-240VAC 50/60 Hz
Power Consumption: 50 Watts maximum
Fuse: 100V: 500mA 250V Slow Blow 5mm X 20mm
120V: 500mA 250V Slow Blow 5mm X 20mm
220-240V: T250 mA 250V 5mm X 20mm
Mains Connection: IEC 320 Receptacle

PHYSCIAL
Dimensions: 3.5” H X 19” W X 11.25” D
Weight: 20.5 lbs (9.3 kg)
Shipping Weight: 25.0 lbs (11.3 kg)
Note: 0 dBu = 0.775V RMS
Specifications are subject to change without notice.


786 Features/Specifications
The dbx Blue Series Solid State Mic Pre-Amp is a 2U two-channel precision mic pre companion product to the 160S Stereo Compressor/Limiter. We refer to this as a "precision mic pre-amp" as it is designed to provide the truest reproduction of the microphone source as is electronically possible, as opposed to "FX" mic pre-amps. The pre-amp features the ubiquitous 48V phantom power, 20 dB pad, and phase invert functions, but also includes a switchable "super low Z" setting which optimizes the pre-amp performance for microphones with very low source impedance. An 11-position coarse gain switch sets the gain between 10 and 60 dB, while the fine gain control varies between -3 and 3 dB. Levels may be monitored on peak-program VU meters with adjustable reference levels.

The signal path consists of a transformer-coupled, discrete-design premium input stage utilizing the proprietary dbx M8’ Mic Pre-Amp Module. The minimum signal path design routes the amplified signal directly to a patented high output drive circuit. Each stage throughout the mic pre-amp is small-signal square wave compensated to assure precise phase alignment at all audio frequencies.

Two output options will be available for the mic pre; an analog card that parallels one extra high drive output per channel acting as a premium signal splitter, and a dbx Type IV Conversion System’ card that provides proprietary analog-to-digital conversion for both channels with both AES/EBU and S/PDIF outputs.

The dbx Blue Series Solid State Mic Pre has patented high-precision, high-drive, transformer-coupled output stages capable of performing with incredible accuracy and sonic transparency in virtually any audio environment. The custom designed transformer, coupled with a discrete distortion canceling driver circuit, is capable of driving 1000 feet of Belden 8451 cable terminated with a 150 ohm load, while maximum drive levels exceed 30 dBm. Yet this output stage exhibits remarkably low distortion levels, immeasurable using standard audio test equipment.