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- Page 1 & preamps since 1964 www.ribbonmics.com | tel: +1-626-798-9128 | fax: +1-626-798-2378 a840 PHANTOM-POWERED VERSION OF THE R84 OWNER’S MANUAL Revision 4, April 2016...
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Page 2: Welcome
Protect it from puffs of air, phantom power, and tramp iron, and it is nearly invulnerable. Treat it well, and it will last decades. Your A840 microphone is 100% handcrafted in Pasadena, CA. AEA is a family owned company with a small crew of skilled technicians – most of them being musicians themselves. -
Page 3: Table Of Contents
TABLE OF CONTENTS WELCOME INTRODUCTION GENERAL GUIDELINES APPLICATION ADVICE “This Side” vs. “That Side” Controlling Leakage Proximity Effect APPLICATION EXAMPLES Vocals Acoustic Guitar Electric Guitar Brass & Woodwinds Strings Piano Drums & Percussion PRECAUTIONS Phantom Power Wind Gusts Tramp Iron Magnetic Stray Fields Microphone Positioning SPECIFICATIONS... -
Page 4: Introduction
48-volt powering. IEC specifies P48 power which should be able to deliver 10 milliamps per input. The phantom current draw for active AEA ribbon mics is 7 milliamps. Please check the current values available on your unit to ensure that it delivers at least 7 milliamps. -
Page 5: Application Advice
APPLICATION ADVICE “This Side” vs. “That Side” Here is an illustration of the pickup pattern of the A840. The AEA logo on the front of the A840 points directly towards the ‘principal axis’ (+) indicated in the diagram. -
Page 6: Controlling Leakage
Pin-2, with respect to Pin-3 on the output connector. The sound of your A840 is slightly different between the front and the back — subtle, but sufficient to offer two “flavors.” In addition to polarity, this is the result of using two wraps of grille cloth on the back and only one on the front. -
Page 7: Proximity Effect
The R44’s proximity effect begins at six feet (1.8 M) and can become huge. The RCA 44 was developed when studios were larger and mics were rarely used close up. The A840 has a more moderate proximity effect, better suited for closer use in contemporary studios. Designed... -
Page 8: Application Examples
“sweet spot”. Try pulling the microphone away from the guitar in increments of 1 to 2 inches (2-5 cm). Listen to the guitar up close and when you find a spot that sounds good, try putting the A840 there. Let your ears be your guide. -
Page 9: Electric Guitar
Locate the center of the speaker cone and place the A840 4 to 8 inches (10-20 cm) away from the speaker. Pointing the mic at the center of the cone will deliver a very direct, “in-your-face”... -
Page 10: Strings
The A840 excels at capturing the richness and full sound of string groups and string soloists. For string soloists, start by positioning the A840 3 to 5 feet (1-2 m) on axis towards the sound hole. To achieve a balanced string group sound, try placing the A840 5-8 feet (2-3 m) away (either in front or above) from the section. -
Page 11: Drums & Percussion
For mono drum room, start by positioning your A840 at head level 9 feet (3 m) in front of the kit. Depending on the size of the room and kit arrangement, you may want to position the A840 further away if you wish to capture more room ambiance. -
Page 12: Wind Gusts
The phantom current draw for active AEA ribbon mics is 7 milliamps. IEC specifies P48 power which should be able to deliver 10 milliamps per input. Some USB and battery-powered audio interfaces will not deliver this. -
Page 13: Magnetic Stray Fields
Guitar players will know this phenomenon from single-coil pickups. Even though much attention was paid to suppressing such sensitivity to external magnetic fields in the design of the A840, it is still possible that you might encounter this problem. If you should pick up... -
Page 14: Specifications
cable to the stand is suggested to avoid accidents. To complete isolation of the microphone from external sources of mechanical noise, it is important to provide a slack loop by tying the microphone cable tightly to the microphone stand with a cable tie, shoelace, or string. (A Velcro® tie will not be tight enough. - Page 15 Data below 200 Hz omitted due to measuring room restrictions. 0 dBr is equivalent to 6.3 mV/Pa at 1kHz. Normalized to 0 dBr at 1kHz. Directivity -30° 30° -60° 60° -90° 90° -120° 120° 10000Hz 4000Hz 2000Hz -150° 150° 1000Hz 500Hz 180°...
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Page 16: Warranty
WARRANTY Your A840 microphone comes with a one-year limited warranty on parts and labor, shipping not included. Please see the supplied warranty card for details. Registering your microphone with AEA will extend the warranty to a full three years. Simply fill out the supplied registration form and send it to: Audio Engineering Associates 1029 N.
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