JOEMEEK JM27
User Guide

JM27 Description
The JM27 is a microphone in the tradition of classic studio microphones. It is a medium sized diaphragm true capacitor microphone with a Cardioid head. This feeds the FET type pre amplifier for low noise. The output balancing is handled by a quality audio output transformer. The capacitor element is manufactured to the classic �concentric electrode� design which provides smooth extended frequency response. Quality is further enhanced by using dynamic feedback actually at the capacitor element. This original technique eliminates distortions which can occur when using this type of microphone for high volume levels. The capacitor membrane is micro fine Mylar with gold sputtering, voltage polarized by phantom power. The microphone body is made of machined brass; Connection is via screened balanced audio cable with 3 pin XLR connectors.

Operation
The JM27 is capable of handling very high sound volume levels so it can be used safely close to musical instrument amplifiers. Often the best sounding instrument are close miced, so it is good to take advantage of the JM27�s high dynamic capability in these situations. It is also a very low noise microphone and suitable for low level or distant miced instrument recording to the highest quality. For voice recording, avoid singing directly into the capsule unless an efficient pop shield is used.

Using the JM27
The JM27 gives a very true sound, meaning that the quality of a recording will depend on microphone placement, and of course, the performer and the surroundings. The response of the microphone is CARDIOID; this means that it is much more sensitive to sounds from the front than from the rear. It is important to remember this when micing up instruments that project sound from different parts; i.e. drums, piano, reed instruments etc. The mic placement will affect the sound quite a bit, so do plenty of experimenting before a take. Remember that different areas of an instrument often produce very different sounds, instrument micing is a highly Creative business and a good technique can make all the difference to the final mix. Once again, do plenty of takes, and don�t be afraid to experiment. The JM27 is an extremely capable recording tool: used properly, professional results will be achieved. Pre amplification is also important to improve the microphone�s sounds. Quality systems like the new Joemeek TwinQ can optimize the JM27�s performance.

Problems
Should the microphone accidentally become damp and fail to operate properly (start crackling, or go very quiet) then place it in a warm and very dry environment for 24 hours. The ideal environment is an airing cupboard, or under a 100 watt light bulb for a couple of hours. The JM27 is extremely resistant to physical damage. but if the microphone fails to work after being dropped, it should be returned in adequate packing to the supplier. A double test and inspection system means that manufacturing faults are almost unknown but should any fault occur, it will be repaired (or replaced) free of charge excepting where the fault has been caused by physical damage.

Care of Your JM27
Although the �Mylar� membrane on the capacitor is more robust than the gold foil used by the German originals of the 1930s, it is still extremely fine and liable to damage if mishandled. There are two safety factors that MUST be remembered when handling these. 1) Keep the microphone dry. 2) Avoid wind or air blasts directly onto the capsule. NEVER blow at the capsule. This is the most important single rule for capacitor microphones. Damage caused by blasts of air on the capsule are often permanent and require the complete replacement of the capacitor element (microphone head). So, never use the microphone in the open air without substantial wind protection. Use of a pop shield in windy environments is essential. With instrument recording in the studio though, unprotected use will give the best sound. All electronic equipment should be kept dry, but it is even more important to avoid any damp conditions when using high quality capacitor microphones. Damp can cause partial short circuits in the polarizing voltage, and this will cause crackling noises and low output.

Specification
Dimensions Frequency Response Sensitivity Polar pattern 137X22mm 30Hz-20KHz 10mV/Pa-40+/-2dB (0dB= 1 V/Pa 1000Hz) Cardioid Diversity> 12dB (300-3000Hz) b Diversity> 15dB(1000Hz) 200 ohms 18dB (A Weighted) 130dB 135g

Connecting Up
Using a high quality balanced and screened audio cable connect the microphone head to the microphone amplifier input and switch on the 48V phantom power. NOTE: the microphone will not operate unless 48V phantom power is provided. A few seconds is often needed for the microphone to reach optimal performance, but be sure to have all audio levels off for the fist 30 seconds during power up.

Impedance Equivalent noise level Max SPL for O.5% THD@1OOOHz Weight

Warranty
The JM27 is warranted from defects for a period of 1 year, parts and labor. Register for your warranty at www.joemeek.com.