VENTURA 
VENTURA MIC PRE/EQ/DI VENTURA MIC PRE/EQ/DI - Back View VENTURA MIC PRE/EQ/DI - Oblique VENTURA MIC PRE/EQ/DI - Macro
© 2012 A-Designs Audio  
A Designs Audio, Quality without Compromise, Pro Audio Products
The Ventura From A-Designs Audio A Versatile “Three In One” Design   Microphone Preamplifier - Parametric Equalizer - Instrument Input Preamplifier General Features 1. Independent Microphone Preamp/Equalizer/Instrument Preamp 2. Specially Designed Discrete Operational Amplifiers 3. Jensen Microphone Input Transformer 4. Insert Point Between Mic Preamp/Instrument Preamp and Equalizer 5. Metal Film Resistors, Polypropylene, C0G and Bipolar Capacitors 6. Silver Contact Toggle Switches (No Relays)  7. Cinemag Transformer Balanced Outputs – Main and Direct/Mult 8. External Switchable Line Power from 110VAC to 220VAC 9. Gold Neutrik XLR Connectors 10. 1RU Steel Chassis 11. Aluminum Knobs 12. Made In The USA Microphone Preamplifier The microphone preamp is a balanced single-stage discrete opamp, transformer coupled design. It includes switches for: phase reverse, -20 dB pad, +48V phantom power with LED indicator and a gain control knob. With the “Input Switch “set to Mic – the signal is fed to both the input of the EQ section/main output and the transformer output mult simultaneously. This gives two separate outputs at one time and is useful in feeding signal to FOH and/or external FX,  power amps, etc. (See Flow Chart) Running at normal levels – a very clear and transparent signal with all the detail, air and extended bass you’d expect from a very high quality analog design is obtained. Push it a little harder and the output transformers will respond giving a more colored character while still retaining clarity. Three Band Parametric EQ The Ventura features a 3-band modified Quad Eight style Parametric Equalizer featuring 33 frequencies. There are three bands of overlapping ranges from 50Hz to 15KHz. Both the frequency selection and the boost/cut controls are stepped for precise recallable settings. Each band has its own Q switch with three fixed positions of Sharp, Wide and Narrow. The low and high bands are a peak/dip type with switches to change their characteristic to a shelf type. The shelving switches disable the Q feature on high and low bands only. The equalizer’s input/insert return provides direct input to the EQ. This bypasses both the mic-preamp and instrument preamp and allows for independent EQ access making the Ventura very flexible. (See Flow Chart) Instrument Input Preamplifier No need for a Direct Box/DI. This is a high-impedance unbalanced preamplifier designed for guitar/bass pickups and keyboards such as vintage synthesizers. Independent from the mic-pre, the instrument preamplifier section uses a single- stage discrete opamp.  It includes a front-panel 1/4″ TS Switchcraft input jack and gain pot. With the “Input Switch “set to Instrument - this also feeds both the input to the EQ section/main output and the transformer output mult simultaneously giving two separate outputs at one time. This is very useful in feeding FOH and/or external FX,  power amps, etc. (See Flow Chart) High and Low Pass Filters The high and low pass filters are a fixed second order 12dB per octave type with the knees at 9kHz and 150Hz. Both filter switches work whether the EQ switch is in or out and are post the EQ which affects the Main/EQ Output only. Direct Out Mult / Insert Return The Output Mult allows the Instrument or Microphone signal to be sent to two different places at once. Send a pre-EQ signal to FOH or an effect, i.e. compressor, delay, power amps, etc and also through the EQ to the main output. The Insert Return allows for the use of external Compressors and/or Effects to be directly added back into the signal path through the EQ to the main output. (See Flow Chart) In the studio or on the stage, the A-Designs Audio Ventura is of a “no frills, no compromise” audio philosophy for pure sonic capture and reproduction. Designed by Carl Johnson. Frequency Response: >20Hz to 20kHz Gain Range: Microphone: -62dBV to +30dBV, Instrument: 70dB, Insert/EQ Input: 0dBV to +26dBV Input Impedance: Microphone: 1.4k ohm typical, Instrument: 20M ohm nominal, Insert/EQ Input: 15k ohm Noise (EIN): >89dBm overall Phantom Power: +48VDC Balanced XLR outputs: 600 ohm nominal Distortion: Better than 0.01% Power Requirements: 120/230VAC Dimensions: 19″ x 1-3/4″ x 10″ (W-H-D) Weight: 14 lb. Shipping weight: 16.5 lb.    DOCUMENTATION:   VENTURA/JM-3001 OWNERS MANUAL VENTURA FLOW CHART
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Ronan Chris Murphy describing how to use the Ventura