Stewart Audio DA-770 Series Owner'S Manual Download Page 1 | Manualshive

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Stewart Audio

14407 Cuesta Court

Sonora, Ca 95370

Tel: 209.588.8111 Fax: 209.588.8113

www.Stewartaudio.com

DA-770 Series

Professional Power Amplifiers.

Owners Manual

WHEN THE PERFORMANCE DEPENDS ON IT

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Summary of Contents for DA-770 Series

Page 1: ...Stewart Audio 14407 Cuesta Court Sonora Ca 95370 Tel 209 588 8111 Fax 209 588 8113 www Stewartaudio com DA 770 Series Professional Power Amplifiers Owners Manual WHEN THE PERFORMANCE DEPENDS ON IT ...

Page 2: ...MOVE COVER OR BACK NO USER SERVICABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONENEL CAUTION RISK OF ELECTRICAL SHOCK DO NOT OPEN The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electrical sh...

Page 3: ...laced on a rug sofa or similar surface which impedes the airflow across the chassis Airflow through the ventilation openings should be unobstructed The amplifier should only be connected to a properly grounded AC outlet as indicated under AC Power Con nections in this manual Do not defeat the ground or polarization of the power plug Route all power cords and other cables so that they are not likel...

Page 4: ...f standard rack space The DA 770 2 Series Amplifiers are convection cooled and require no noisy fans for cooling We at Stewart Audio strive to bring you the finest in professional electronics and we thank you for your choice which we see as an appreciation for our efforts The Stewart Audio Design Team 4 Specifications 17 8 Ohm Stereo Power 35 Watts Ch 4 Ohm Stereo Power 70 Watts Ch Frequency Respo...

Page 5: ...view section on Thermal Considerations Check clip lights for indication of overdriving NOTE overdriving for a long period of time can cause thermal shutdown Distorted output Check input signal level and signal source Set gain by turning amplifier volume all the way down set preamp level to normal turn up amplifier volume to desired level Noise on output Check signal source for noise Long unbalance...

Page 6: ...more than 90 is typical of this design While pulse width modulated PWM switching amplifiers Class D can also achieve similar power advantages none have been able to do so without a significant compromise in audio fidelity Hence the new Stewart Audio digital amplifier A new standard in audio performance and power efficiency Customers no longer have to choose between sonic fidelity or efficiency Bot...

Page 7: ...s pioneered leading edge power supply technology All Stewart Audio amplifiers feature a High Frequency Switch Mode Power Supply Because of this use of advanced technology some explanation is in order Conventional Power Supplies operating at 60 Hz standard line frequency recharge only 120 times per second requiring their storage capacitors and transformers to be quite large to supply the energy nee...

Page 8: ...ht be necessary to install a cooling fan in the rack for additional cooling In free standing installations where the amplifier is sitting on a shelf or hard floor the four rubber feet must remain mounted to the bottom of the amplifier Under no circum stances should the amplifier be placed directly on carpeting or similar surfaces AC Power Considerations Your Stewart Audio DA 770 2 amplifiers are d...

Page 9: ...oid cosmetic damage to the rack mount panels When rack mounting your DA 770 2 Series amplifiers be sure to remove the four adhesive rubber feet from the bottom of the unit The DA 770 2 Series amplifiers can also be mounted to a standard rack shelf or used as a stand alone product Thermal Considerations Cooling of the DA 770 2 Series amplifiers is achieved by Stewart s unique whole chassis heatsink...

Page 10: ... driven into clipping All adjustable controls and connections are located on the rear panel to provide tamper proof security Rear Panel Level Controls The DA 770 2 has been equipped with a recessed stepped level control for each channel located on the rear panel 10 Inputs Each Channel has a phoenix type connector which may be used with either balanced or unbalanced lines See Input Wiring in the se...

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