If you would like to get a CR for your mic, you can get one for as little as $5 if you are patient and know where to look. The CR and CM elements work in a much different way making them very unique. At least not at differences as small as 100 or so ohms on a high Z controlled magnetic element as used in today’s applications. Dual-impedance internally selectable, built-in mic cord, supplied with 1/4" phone plug … Gold Coverage goes above and beyond the manufacturer's warranty to protect your gear from unexpected I believe that Shure is still using the 2 letter date code for the 520DX. It appears that the MC151’s differed from one to another like the Shures, but not quite as much. The 520DX is the first choice of microphone for blues harmonica players. (717 KB), Volume control knob allows users to adjust the volume to fit each musical situation, Rugged, dynamic cartridge with improved response. Another spec sheet on the 520D from 1986 listed the mic as having a frequency response of 100 to 5,000Hz, which were the dual impedance controlled magnetic elements that for the most part seemed to be a bit brighter than the older models. It does have it’s place in that it really doesn’t sound like any other harp mic on the market, and some players like having a mic that is somewhere between a 520 and a vintage vocal mic. The amplifier then takes the electrical impulses created by the microphone and turns them back into mechanical vibrations, which vibrate the cone of a speaker, or speakers, and are heard as the amplified music or speech that was picked up by the microphone. Instrument microphone delivers an exceptionally uniform cardioid pattern to minimize feedback. I have never seen a CM with this disc. The element produces sound by taking the mechanical vibrations created on the foil diaphram when you speak into the mic, or put the mic in front of any source of sound, which turns the vibrations into electrical impulses that are picked up by the magnetic armature via the pin glued to the diaphram, and the magnetic armature as described previously. The 440 bullet has a much larger, single vent hole in it on the bottom of the shell below the tag, as opposed to the 2 small vent holes that the 520’s have. In my opinion, as compared to a typical CR or CM, the MC151 does not have the grit and growl that the Shure magnetic elements have, and they usually lack low end response. These metal pieces were sometimes not perfectly aligned, and would cause the gap in the armature assembly to be inconsistent from one element to another, which is another reason why the early models were more inconsistent in tone as compared to the later models. As I mentioned earlier, you will occasionally find one that really stands above the rest. Not a good idea! Some elements may have you guessing though, like the ones that may have been made in the late 60’s or, possibly 80’s. Most dynamic mic elements work in a similar way, but the design of these CM and CR elements is much different than typical moving coil dynamic elements, which work pretty much the same way a speaker works but in reverse. Modern vocal mics have a frequency response that goes way below and above the response of vintage mics, and don’t make for good harp mics at all unless you want to have a more natural acoustic sound. If you must clean up your element, use a lint free cloth with water or alcohol if needed and do not stick anything into the little holes in the face of the element. For products under $200 experiencing the above failures, a Musician's Friend gift card will be NEVER clean a magnetic element with steel wool, and if you use it to prepare a shell for painting, make sure that you remove the element from the shell and store it in a zip lock plastic bag or something to prevent it from coming into contact with the metal dust from the steel wool. These are the mics that made the MC151 popular with harp players. Now the 520DX mic is a different story. Their unique construction makes them much more durable than just about any other type of microphone element. a Card Payment, Manage Over the years, Shure used many different model numbers on the CR and CM elements which were used in many different types of microphones for other companies as well as their own. response listed as 100 to 7,000CPS, and one from 1961 would have the response as 100 to 9,000CPS, and then another from 1964 would say 100 to 7,000 CPS again, so possibly they noticed the subtle changes from one element to another too, and decided to change the specs although no changes were made to the microphones. The first digit is the year of manufacture, and the last two digits are the week of the year that they were made. This is because there are now a bunch of people seeking out every microphone ever made that has a CM or CR element in it on ebay. For example 322 would be the 22’nd week of 1953, and 943 would be the 43’d week of 1959, or, October 1959. So, the letter A could be either 1961, or, 1981. of There is a way to get some hints though. I haven’t seen a black labeled CR with a date code that began with a 4, but as far as I know, they were used up until late January or early February 1954. The letters ran alphabetically beginning with the letter A as 1961. Typical moving coil elements turn the mechanical vibrations of the diaphram into electrical signals via the coil winding around a fixed magnet which is constructed very similar to the way a speaker is constructed. Another thing I see on a lot of the old black labeled models is corrosion forming under the magnet assembly. I’ve heard a few people say that the model 440 bullet has a better tone than the 520. The impedance of a mic is determined by a formula, but as far as this website goes, we will refer to impedance as the actual DC resistance of the element because this is what most people think impedance is. I have had conflicting literature and specs sent to me by Shure. So which is correct? The literature sent to me was from many different periods in time, from 1949 through 1967 for the 520. Both the early Shure and Astatic mics had Brush Co. stickers on them. If you’re still having trouble trying to figure out the year your element was made, there are some other clues such as the tags used on the shells that may help, but this information should help you determine exactly when your mic or element was made. The early Aststic crystals were made by the Brush Co. which also made the early crystal elements for Shure mics back in the 30’s. These are few and far between, so don’t set out to find one unless you’ve got a lot of money to burn. One very important thing to keep in mind is that these elements are pressure actuated. Download PDF Harmonica mics have a very distinctive sound.

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