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With the advent of digital recording, ribbon microphones made a major comeback. Their ability to 
record fast transients accurately without adding upper-range resonances became a positive attribute, as 
high-frequency transfer loss was no longer a problem. Users have also become more familiar with the 
usefulness of a ribbon microphone’s native figure-eight polar pattern and proximity effect bass tip-up. 
With fundamental tunings as low as 16 Hz the 44 is the king of bass. The 44 is flat down to 20 Hz from 
a distance, and if used closer than six feet starts to have bass tip-up. No wonder announcers love them.

AEA began restoring and repairing RCA ribbon microphones soon after RCA ceased production and 
service. In the early 1980s AEA also began servicing and importing STC/Coles 4038 studio ribbon 
microphones. Over the next two decades AEA started making replacement RCA parts, and finally 
developed a complete set of external parts for the 44 based on the classic RCA 44BX built in Camden, 
NJ. During this period appreciation for the 44’s sonic character continued to grow. Antique and radio 
collectors also admired them which decreased their availability and increased their price. 

Mentored by Jon Sank, one of the last engineers who worked for the RCA microphone division, Wes 
Dooley (AEA’s owner and chief engineer) began work on reproducing the interior parts. The 44 had 
been produced in Camden, New Jersey; Hollywood, California; London, England; and Australia. While 
repairing and analyzing these different versions, Wes and his team correlated which design elements 
had the most “pleasing” sound quality for their owners. The AEA R-44C incorporated those design ele-
ments.

The primary difference between the AEA R-44C and the RCA-44B/BX is in the magnets. The RCA-
44B/BX used high-output Alnico magnets, the best available at the time. By the 1990s, neodymium 
had replaced Alnico as the best material for this purpose, so it was used in the AES R44C. True to their 
origins in providing repair services for these classic microphones, all of the assemblies of the AEA 
microphone are directly interchangeable with the original RCA.

AEA’s service department was already fortunate to be using New-Old-Stock (NOS) ribbon mate-
rial from the 1970s that had been made for RCA. Once a custom microphone output transformer was 
developed that matched the original RCA sonics, the culmination of this work was the introduction of 
the AEA model R44C at the 1998 AES Convention in San Francisco. AEA has continued to make use 
of modern technology to create new versions so as to bring this classic microphone closer to Olson’s 
ideal: the best microphone possible for music and voice work.

The AEA R-44CNE was released in 2001 to celebrate the 100th anniversary of the NAMM (National 
Association of Music Merchants, now named the International Music Products Association). As with 
RCA 44s produced in England and Australia, the R44CNE has a simplified shell and cushion-mount 
assembly. The internal parts are the same as the ‘museum quality” R44C series. By simplifying the 
shell and cushion-mount this version sells at a lower price than the model R44C, the 1936 museum rep-
lica. 

AEA developed the ‘X’ motor option using higher energy magnets to increase the output of the micro-
phone by 6 dB. This version was developed at the request of scoring mixers who needed a lower noise 
floor, and did not need to match exactly the sound of original RCA 44s. This allowed “Lord of the 
Rings” scoring engineer John Kurlander to mix his AEA R44 string pair almost as high in the mix as 
his main Neumann M-50 tube microphones on the Decca Tree.

Summary of Contents for AEA A440

Page 1: ...e Atlas SB36 studio boom stand While there are many suitable stands from other manufacturers conventional musicians series folding tripod based microphone stands are not recommended because they are n...

Page 2: ...the ribbon however is a strong gust of air such as from a nearby open door window or air conditioning vent the close pulse from a bass drum the turn on thump from a guitar or bass amplifier moving or...

Page 3: ...null of all polar patterns nearly 90dB in the plane of the diaphragm with a well designed model It is important to realize that this null plane extends both laterally and vertically with respect to t...

Page 4: ...phone is only 6dB down at 90 the potential for feedback can be high By using a bidirectional microphone however with the deep null plane aimed directly at the cluster the potential for feedback can be...

Page 5: ...noise will self cancel and sound sources that are closer and more directly on axis will prevail Jim Tannenbaum a very active film dialog mixer in Hollywood explained at an AES Workshop how he uses thi...

Page 6: ...his can elim inate the need to rely on a mixing engineer to make them sound right the musicians do it themselves For Announcers Dialog and Radio Plays Ever since the golden days of radio in the 1930s...

Page 7: ...nd depth Like most things in audio however the potential tradeoff is reduced articulation or clarity that can result from excessive bass response or boominess Proximity effect should be treated like a...

Page 8: ...sonant frequency it exhibits none of the upper midrange high Q resonance peaks common to large diaphragm condensers This ribbon design delivers extremely fast and accurate transients Such a lightly te...

Page 9: ...Level changes with angle frequency response is consistent 90 dB null at 90 270 Vertical Level changes with angle reduced HF response above and below 0 180 axis null at 90 270 Transducer element Ribbon...

Page 10: ...t 7 mA current draw it has a 9 dBA noise floor and handles 136 db SPL A custom 9 mA version has a 6 dbA noise floor and handles 132 5 db SPL Such wide dynamic range is equal to the best studio condens...

Page 11: ...Displayed range from 100 Hz up due to measurement room size limitations...

Page 12: ...open the case Audio Engineering Associates 1029 North Allen Avenue Pasadena CA 91104 Phone 1 626 798 9128 Fax 1 626 798 2378 URL www ribbonmics com e mail stereoms aol com References and Recommended...

Page 13: ...pickups and have an omnidirectional polar pattern because absolute pressure is not dependent on the direction of approach ref Figure 5 The first microphones were developed by the infant telephone indu...

Page 14: ...of the ribbon This ribbon was suspended in a magnetic field and thus generated a small electric current in direct response to its movement ref Figures 6A and 6B The term velocity microphone also is c...

Page 15: ...properly designed single diaphragm bidirectional microphone a response null of almost 90dB will oc cur at precisely 90 from the principal pickup axis Figure 8 shows that this null exists both vertica...

Page 16: ...oday Since the early 1980s Audio Engineering Associates has been proud to spearhead the reintroduction of these venerable classics to the industry and to continue their tradition with new and improved...

Page 17: ...o Engineering Society June 1970 The rapid advancement of permanent magnet technology in the 1930s had freed Olson s ribbon micro phones from the constraints of using an electromagnet The 44 had an acc...

Page 18: ...en the AEA R 44C and the RCA 44B BX is in the magnets The RCA 44B BX used high output Alnico magnets the best available at the time By the 1990s neodymium had replaced Alnico as the best material for...

Page 19: ...making it among the quietest microphones made Although the acoustic fre quency response of an A440 is the same as an R44CX the sonic character is different This character is often described as warmer...

Page 20: ...um All the closer microphones were AEA ribbons with the electric cello on an AEA R44CNE http www wesdooley com pdf PR_Turtle_Island_String_Quartet2 doc Is the A440 the best 44 incarnation ever Time wi...

Page 21: ...se and accurate localiza tion within the stereo stage As with a single bidirectional microphone a Blumlein pair can be worked from opposite sides with equal effect This allows multiple actors or music...

Page 22: ...orward facing mid microphone and a laterally oriented bidirectional side microphone By combining these component signals via a sum and difference matrix the left channel traditionally is the mid side...

Page 23: ...by employing bidirectional patterns oriented along the three car dinal axes lateral fore aft and vertical and then matrixing these with an omnidirectional pickup the complete spherical sound field ca...

Page 24: ...ichannel Modular Studio Microphone Stands and Booms Flightweight Stands Medium Duty Vertical Stands and Booms Heavy Duty Stands and Booms Crank up Stands Since 1983 we ve been the US agent for Coles E...

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