Ashly SG-35E User's Manual
Contents
1. shly s SG 33E and SG 35E Noise Gates are versatile noise reduction systems designed to contro leakage and background noise in recording and sound rein forcement applications Acting much like a level sensitive switch they automatically attenuate audio signals which fall below a user selected threshold while passing audio that reaches or exceeds that threshold The design of the Ashly Gates can be broken down into two functional building blocks a voltage controlled amplifier VCA which performs the actual task of muting or passing the audio signal and a detector circuit which is responsible for providing the contro voltage that determines the gain of the VCA Use of a VCA as a gain control ele ment provides several advantages in a noise gate including superior audio fidelity accurate tracking of two or more units that are tied for stereo operation and attack release speeds that are much faster than those possible with optically coupled devices The Ashly VCA used in our noise gates is a class AB device which exhibits extremely low distortion low noise low control voltage feedthrough turn on click and excel lent thermal stability The detector circuit encompasses all of the front panei controls and gives the Ashly Noise Gates their turn on and turn off characteristics Through the use of unusually wide range time constant options a great variety of gating effects can be achieved A very fast 10 us a2. Distortion between 201e and 20kHz w 10dBV input shall be no more than 07 Crosstalk from the Key Input shall be no greater than 85dB LkHz Noise between 20Hz and 20kHz shall be no greater than 85dBV Gain shall be unity Detector symme try shall be 0 254B Control Voltage Feedthrough shall be typically 65dBV Maximum input output level shall be 20dBY The Slew Rate shall be gt 10V per pS Threshold Range shall be adjustable from 40 to 20dHY The attack time shall be adjustable from 104S to 30 seconds per 40dB of gain increase The Hold Before Pade time shall be adjustable from 40mS to 12 seconds The Fade time shall be adjustable from 15m6 to 90 seconds per 404D of gain decrease Noise attenuation Floor shall be adjustable from Od8 to 7548 The input impedance shall be 10ki Balanced Bridging Active The output Impedance hall be 200 terminated with 600 or greater The unit shell operate at LISVAC 5 GO 00Ha The unit shall be designed for mounting in a standard EIA 19 rack 19L x 1 75 H 8G 338 or 3 5 H SG 35E x 6D and shall have a shipping weight of 6 Ibs SG 33E or 10 Ibs SO 368 THe unit shall be either a mode SG 338 two channel Noise Gate or a model 8G 35E four channel noise gate manufactured by Ashly Audio Inc No other unit shall be acceptable unless data submitted from an independent test laboratory verifies that the above combined sire performance specs are met Since 1972 1900 Ashiy Audio
3. me Fade Time per 40dB gain decrease Noise Attenuation Floor Input Impedance Output Impedance Additional Features Power Requirements Size Shipping Weight lock Diagram Single Channel 5Hz to 100kHz 0 2dB 02 02 85dB 850BV Unity 0 25dB 65d BY typical 20dBV gt 10V per us 40dBV to 20dBV 10 18 to 30 seconds 40 milliseconds to 12 seconds 15 milliseconds to 30 seconds Od6 to 7506 10kQ Balanced Bridging Active 20012 terminate with 60002 or greater Key Input switch selectable Noise Gate Bypass switch Stereo interconnect via rear pane jacks LED Threshold Indicator 120VAC 50 60Hz 5W SG 33E 19 L x 13 4 H x 6 D SG 35E 19 L x 3 1 2 H x 6 D SG 33E 8 Ibs SG 35E 10 Ibs ew wa our P ouTPuT CONTROL lt STEREO a our KA THRESHOLD mE SUBSONIC kd KEY gt ey ren IN ATTACK TIME H DETECTOR x HOLD TIME SYMMETRICAL FADE TIME Architect s Specification The unit shall be a two 5G 33E or four SG 35E channel noise gate utilizing a class AB Voltage Controlbed Amplifier and a detector which has dual release time circuit The nolso gate shall have key Inputs stereo patch tie points and front panel noise gate bypass switches Performance specifications of a typical production unit shall meet or exceed the following Frequency response shall be from Se to 100kHs 0 240 The THD between 20Ms and 20kis w 104BV input shall be no more than 02 The IM
4. ttack time insures that the leading edge of fast transient material such as snare drums will never be lost and the fade control offers smooth linear fade times of up to 30 seconds The hold control offers a wait before fading option to prevent premature initi ation of the fade cycle This is useful when processing material that contains natural pauses such as speech and instrumental solos The threshold range is greater than 60dB making the SG 33E and SG 35E useful for both professional and semi pro signal levels Plus a key input is provided to allow gating by a second signal and a stereo tie patch point makes accurate tracking between two channels possible Both the SG 33E and SG 35E like all Ashly products are covered by Ashly s exclusive five year warranty Noise Gates model SG 33E model SG 35E Five Year Worry Free Warranty Fast Attack Time 10 1 60db Threshold Range Stereo Tie Patch Point for Accurate Tracking of Two or More Gates Inputs May Be Used Balanced or Unbalanced Extremely Low Noise and Distortion In Out Bypass Switching Two Stage Release Circuit Specifications Frequency Response THD 20 20kHz 10dBV Input IM Distortion 20 20kHz 10dBV Input Crosstalk from Key Input 1kHz Nolse 20 20kHz Gain Detector Symmetry Control Voltage Feedthrough Maximum Input Output Level Slew Rate Threshold Range Attack Time per 40dB gain increase Hold Ti
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