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dbx 786 Precision Microphone Preamplifier
Estimated price for orientation: 1 015 $
Category: Preamps and Channel Strips
Class:
Description Condition: New other (see details): A new, unused item with absolutely no signs of wear. The item may be missing the original packaging, or in the original packaging but not sealed. The item may be a factory second or a new, unused item with defects. See the seller’s listing for full details and description of any imperfections. See all condition definitions- opens in a new window or tab ... Read moreabout the condition Brand: dbx Number of Channels: 2 Model: 786 Country/Region of Manufacture: United States
dbx 786 stereo precision microphone preamplifier. This unit is offered by Dynacoustics, central New Jersey's leader in pro audio sales since 1987. It was taken from our floor demo stock, unused and unsold since ordered from dbx in 2014. Save hundreds of the original retail price of $1999.00 on this recently discontinued model from the leader in microphone amplification and dynamics control; dbx.Here are the details from the dbx Professional website;786
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 solidaluminum knobs, LEDs mounted individually in machined stainless steelhousings, custom VU meters with peak indicators, and heavy gauge chassis solidify the 786 as the benchmarkpreamplifier for decades to come. The 786 combines the bestpreamplifier 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 EQcircuit called "spectrum" with frequency cut and boost up to 40kHz. An 11-position coarse gain switch sets the gainbetween +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 themic pre-amp enhances the highfrequency spectral content of the signal while maintaining phase integrity. The "Detail" control varies the amount of highfrequency shelving boost at the frequency determined by the Spectrum control. The combination of the Spectrum and Detail controls allow pristine highfrequency 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 advancedpreamplifier in the world.786 Features/Specifications
The dbx Blue Series Solid State Mic Pre-Amp is a 2U two-channel precision mic pre companion product to the 160SStereo Compressor/Limiter. We refer to this as a "precision mic pre-amp" as it is designed to provide the truest reproduction of themicrophone source as is electronically possible, as opposed to "FX" mic pre-amps. The pre-ampfeatures the ubiquitous +48V phantom power, 20 dB pad, andphase invert functions, but also includes a switchable "super low Z" setting which optimizes the pre-amp performance for microphones with very low sourceimpedance. An 11-position coarse gain switch sets the gain between +10 and +60 dB, while the fine gain control varies between -3 and +3dB. Levels may be monitored on peak-program VU meters with adjustable reference levels.The signal path consists of a transformer-coupled, discrete-design premium inputstage 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 phasealignment 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 channelacting as a premium signal splitter, and a dbx Type IV Conversion System' card that provides proprietary analog-to-digitalconversion 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.Features:
130dB of Dyanmic Range
High-Drive output transformer circuit drives 1000 ft. of Belden cable at +30dBu with only .007% THD
+48V Phantom Power, Phase Reverse, -20dB Input Pad
Super Low-Z input switch for low impedance mircrophones or altering the microphone's sonic character
Proprietary High Frequency EQ circuit with cut/boost to 40kHz
Specifications:
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 inputXLR 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: 2 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
Description
| Condition: | New other (see details): A new, unused item with absolutely no signs of wear. The item may be missing the original packaging, or in the original packaging but not sealed. The item may be a factory second or a new, unused item with defects. See the seller’s listing for full details and description of any imperfections. See all condition definitions- opens in a new window or tab ... Read moreabout the condition | Brand: | dbx |
| Number of Channels: | 2 | Model: | 786 |
| Country/Region of Manufacture: | United States |
dbx 786 stereo precision microphone preamplifier. This unit is offered by Dynacoustics, central New Jersey's leader in pro audio sales since 1987. It was taken from our floor demo stock, unused and unsold since ordered from dbx in 2014. Save hundreds of the original retail price of $1999.00 on this recently discontinued model from the leader in microphone amplification and dynamics control; dbx.Here are the details from the dbx Professional website;786
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 solidaluminum knobs, LEDs mounted individually in machined stainless steelhousings, custom VU meters with peak indicators, and heavy gauge chassis solidify the 786 as the benchmarkpreamplifier for decades to come. The 786 combines the bestpreamplifier 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 EQcircuit called "spectrum" with frequency cut and boost up to 40kHz. An 11-position coarse gain switch sets the gainbetween +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 themic pre-amp enhances the highfrequency spectral content of the signal while maintaining phase integrity. The "Detail" control varies the amount of highfrequency shelving boost at the frequency determined by the Spectrum control. The combination of the Spectrum and Detail controls allow pristine highfrequency 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 advancedpreamplifier in the world.786 Features/Specifications
The dbx Blue Series Solid State Mic Pre-Amp is a 2U two-channel precision mic pre companion product to the 160SStereo Compressor/Limiter. We refer to this as a "precision mic pre-amp" as it is designed to provide the truest reproduction of themicrophone source as is electronically possible, as opposed to "FX" mic pre-amps. The pre-ampfeatures the ubiquitous +48V phantom power, 20 dB pad, andphase invert functions, but also includes a switchable "super low Z" setting which optimizes the pre-amp performance for microphones with very low sourceimpedance. An 11-position coarse gain switch sets the gain between +10 and +60 dB, while the fine gain control varies between -3 and +3dB. Levels may be monitored on peak-program VU meters with adjustable reference levels.The signal path consists of a transformer-coupled, discrete-design premium inputstage 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 phasealignment 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 channelacting as a premium signal splitter, and a dbx Type IV Conversion System' card that provides proprietary analog-to-digitalconversion 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.Features:
130dB of Dyanmic Range
High-Drive output transformer circuit drives 1000 ft. of Belden cable at +30dBu with only .007% THD
+48V Phantom Power, Phase Reverse, -20dB Input Pad
Super Low-Z input switch for low impedance mircrophones or altering the microphone's sonic character
Proprietary High Frequency EQ circuit with cut/boost to 40kHz
Specifications:
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 inputXLR 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: 2 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
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 solidaluminum knobs, LEDs mounted individually in machined stainless steelhousings, custom VU meters with peak indicators, and heavy gauge chassis solidify the 786 as the benchmarkpreamplifier for decades to come. The 786 combines the bestpreamplifier 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 EQcircuit called "spectrum" with frequency cut and boost up to 40kHz. An 11-position coarse gain switch sets the gainbetween +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 themic pre-amp enhances the highfrequency spectral content of the signal while maintaining phase integrity. The "Detail" control varies the amount of highfrequency shelving boost at the frequency determined by the Spectrum control. The combination of the Spectrum and Detail controls allow pristine highfrequency 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 advancedpreamplifier in the world.786 Features/Specifications
The dbx Blue Series Solid State Mic Pre-Amp is a 2U two-channel precision mic pre companion product to the 160SStereo Compressor/Limiter. We refer to this as a "precision mic pre-amp" as it is designed to provide the truest reproduction of themicrophone source as is electronically possible, as opposed to "FX" mic pre-amps. The pre-ampfeatures the ubiquitous +48V phantom power, 20 dB pad, andphase invert functions, but also includes a switchable "super low Z" setting which optimizes the pre-amp performance for microphones with very low sourceimpedance. An 11-position coarse gain switch sets the gain between +10 and +60 dB, while the fine gain control varies between -3 and +3dB. Levels may be monitored on peak-program VU meters with adjustable reference levels.The signal path consists of a transformer-coupled, discrete-design premium inputstage 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 phasealignment 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 channelacting as a premium signal splitter, and a dbx Type IV Conversion System' card that provides proprietary analog-to-digitalconversion 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.Features:
130dB of Dyanmic Range
High-Drive output transformer circuit drives 1000 ft. of Belden cable at +30dBu with only .007% THD
+48V Phantom Power, Phase Reverse, -20dB Input Pad
Super Low-Z input switch for low impedance mircrophones or altering the microphone's sonic character
Proprietary High Frequency EQ circuit with cut/boost to 40kHz
Specifications:
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 inputXLR 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: 2 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