Astatic CTM 77 User's Manual
Contents
1. j ESAO s a T 0 50 100 500 1K 5K 10K 20K RESPONSE IN dB 2 FREQUENCY IN HERTZ TWO YEAR LIMITED WARRANTY Astatic Microphones are warrantied for two years to the original purchaser from the date of purchase by Omnitronics LLC to be free from defects in material and workmanship In event of such defect product will be repaired or replaced at Omnitronics LLC discretion with a new unit of equal or superior value This will be at no charge if delivered prepaid to Omnitronics LLC together with the proof of purchase and a Return Authorization Number The unit willbe returned promptly prepaid Warranty excludes exterior finish appearance items or malfunction due to abuse or operation under other than specified conditions Consequential or incidental damages are excluded Serial number of product and original purchaser s name must be registered immediately after purchase Please use the attached registration form for this purpose This warranty gives you specific legal rights and you may also have other rights which vary from state to state Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts so the above exclusions and limitations may not apply to you Note No other warranty written or oral is authorized by Omnitronics LLC SHIPPING INSTRUCTIONS Please call our customer service department at 440 593 1111 for a pre approved return authorizatio2. Industrial Audio Products Description The Astatic CTM 77 is a superior low noise electret condenser cardioid microphone designed for professional vocalists and musicians The CTM 77 provides the performance and features to satisfy today s most demanding professionals The wide and flat frequency response of the CTM 77 provides natural transparent sound quality The cardioid pickup pattern minimizes annoying feedback when used close to sound reinforcement speakers and monitors and reduces the pickup of unwanted off axis sounds A transformerless electronic design provides optimum low frequency response and low distortion An effective internal multistage pop filter minimizes wind and breath noise The locking on off switch provides excellent flexibility of use The CTM 77 has a Flex Form hardened steel grille screen that dramatically resists deformation while greatly reducing any risk of adverse performance caused by a bent or dented ball screen This unique ability to retain its original shape assures that the CTM 77 will maintain its attractive appearance The CTM 77 features the exclusive I N R 3 Impact Noise Rejection system Our proprietary rubber shock mount isolates the transducer from the barrel thus dramatically reducing cable stand and handling noise The need for any external shock mounting device is virtually eliminated The low frequency response of the CTM 77 may be enhanced by increasing or decreasing the distance f
3. l Open Circuit Voltage 55 dB 0 dB 1 volt per microbar Impedance 500 ohms Dynamic Range 110 dB Equivalent Noise Level Less than 22 dB A weighted Maximum SPL 132 dB 1 THD open circuit Powering Supply Voltage 9 52 Vdc positive pins 2 amp 3 reverse polarity protected Current Required Less than 5 mA over operating voltage range Phasing Positive pressure on diaphragm generates a positive voltage on pin 2 relative to pin 3 Grille Screen Hardened Steel Mesh Case Steel and die cast zinc alloy Finish Durable soft feel non slip midnight black Dimensions See drawing on other side Architects and Engineers Specification The microphone shall be an electret condenser type low impedance with wide range frequency response uniform from 50 Hz to 18 kHz Output level at 1 kHz shall be 55 dB 0 dB 1 volt per microbar The polar response shall show a minimum of 15 dB at 180 degrees between 300 Hz and 1500 Hz The transducer shall be isolated from handling noise and other mechanically generated vibration The microphone case shall be steel and die cast zinc alloy The microphone shall have a length of 6 25 32 and a maximum diameter of 1 13 16 The microphone body shall be finished in a soft feel non slip midnight black A snap in clamp and a zippered vinyl protective pouch shall be supplied The Astatic Model CTM 77 is specified SPECIFICATIONS FOR CTM 77 7B0 kHz LI 0 D LI H PUT Pt TAT
4. n number and carefully repack the unit and return it to Omnitronics LLC 341 Harbor St Conneaut OH 44030 ALL RETURNS MUST HAVE A PRE APPROVED RETURN AUTHORIZATION NUMBER OR IT WILL BE REFUSED If outside the United States contact your dealer or distributor for warranty details
5. rom the sound source This phenomenon is technically known as proximity effect Nominal or flat response is generated at a distance of 24 inches or more However as the distance to the sound source decreases the bass sensitivity increases providing a solid robust character The CTM 77 is supplied complete with a zippered vinyl protective pouch and a snap in microphone swivel mount CTM 77 ELECTRET CONDENSER CARDIOID MICROPHONE CAD Quality All Astatic CTM 77 microphones are audio tested and inspected prior to shipment Our absolute commitment to quality insures that Astatic microphones remain the Best Value in today s competitive industry Operation and Maintenance The Astatic CTM 77 is one of the finest instrumental and recording microphones available Although it is extremely durable it should be stored in the zippered pouch provided to protect it from dust and dirt when not in use If the front screen becomes soiled by dirt or residue it may be cleaned using the following procedure Unscrew the front screen assembly and remove the inside foam windscreen Wash the foam windscreen using a mild detergent and let dry thoroughly Follow the same method for the grille screen To clean the mike housing use a cloth dampened with isopropyl alcohol Specifications C 4 Generating Element Electret condenser Phantom Powered Polar Pattern Unidirectional Cardioid Frequency Response 50 Hz 18 kHz Output Leve
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