Directional microphones consist of a diffuser as well as an amplifier. Many modifications are used by special services. Modern devices are produced with and without filters. Many modifications can boast of high sensitivity. According to experts, it is more expedient to purchase the model with two lithium batteries.
The minimum threshold frequency is 300 MHz on average. The impedance sensitivity does not exceed 3 mV. Many models use two amplifiers. The conductivity of the sound signal in this case increases quite strongly. On the market, a directional microphone for professionals costs about 12 thousand rubles.
How to DIY?
To make a directional microphone with your own hands, you must first install the cone. Many experts in this situation recommend the use of diode devices. Their minimum sensitivity index is on average 4 mV. It is also worth noting that the microphone will require a small filter that will cope with impulse noise. It is more expedient to select amplifiers of a low-frequency type.
Their energy consumption is not too high. It is also worth noting that they are compact and do not take up much space in the device. The battery is directly installed behind the diffuser. To increase the conductivity of the signal, it is recommended to use a constant adapter.
King EH031 device parameters
These directional microphones are mostly positive. According to experts, the signal conductivity in the device is quite high. A quality amplifier deserves special attention. This microphone uses a linear type. The protection system is used class PP40.
The operating humidity of this series microphone is 40%. According to experts, low frequencies are perceived by the diffuser without problems. Foreign objects significantly reduce the quality of hearing. This directional microphone works great up to 130 meters away. Linear audio output in this case is available. The modification costs around 8800 rubles.
King EH035 series microphones
This directional listening microphone is made with two dipole triodes. The amplifier is normally used low-frequency type. The sensitivity index at the impedance is 3.3 mV. According to the experts, the signal conductivity at low frequencies is quite high.
The modification's conductor is located at the back of the device. It is also worth noting that the model is equippedexcellent protection system class PP42. All this suggests that the modification is able to work at a distance of over 130 meters. Voice audibility at high frequencies is quite high. The compact dimensions of the microphone deserve special attention. The price of this product starts from 13 thousand rubles.
Features modifications King EH040
The microphone (directional) of the presented series is distinguished by high quality of audibility at low frequencies. The modification filter is used with a diode adapter. According to experts, the diffuser has a low signal conductivity. It is also worth noting that the model has problems with fast discharge. The battery in the device uses a lithium type, and it is designed for five hours of operation. He has very little energy. The amplifier in the model is of poor quality. The device costs about 12,300 rubles in stores
Shure SV200 device parameters
This microphone (directional) is great for listening at distances over 100 meters. If you believe the experts, then the low frequencies are heard wonderfully. The microphone adapter is of good quality. It is also worth noting that the diffuser is able to work at high humidity. A small filter that filters out unnecessary sounds deserves special attention.
Interference from extraneous vibrations, it filters quite well. However, there are still some shortcomings in the device. With high frequencies over a long distance, the model copes poorly. Line-out audio in this casemissing. It is also worth noting that the model is quickly discharged. In this case, the battery indicator sometimes burns out. The modification costs in our time about 14,300 rubles.
Shure SV300 Series Microphones
This microphone (directional) is best suited for use at a distance of up to 140 meters. The conductivity of the signal at low frequencies is quite high. At a distance of up to 80 meters, voice audibility is very good. The adapter for the battery in this case is selected dipole type. This microphone has only one diffuser. To connect headphones, a linear coaxial output is used. Also, the modification has a 3.5 mm jack. The high frequency sensitivity in this case is 3.3 mV.
According to experts, the device is not suitable for professionals in the best way. The model does not have an on indicator. It is also worth noting that the diffuser does not cope well with high frequencies. There is no adapter for a linear video output in the device. The battery charge indicator is not provided by the manufacturer. This directional microphone costs for wiretapping at a distance of 10-11 thousand rubles.
Features of Rode NTG-2 modifications
This microphone (directional) is made with two cones. According to experts, the signal conductivity at low frequencies is quite high. At a distance of up to 100 meters, voice audibility is good. There is no filter for impulse noise in this case. Also worthnote that the microphone amplifier is selected without an adapter.
If we talk about the connection, it is important to mention the presence of a coaxial connector. The modification also has a linear audio output. The audibility of high frequencies at a great distance is not very good. In this case, the sensitivity of the amplifier is at the level of 2.2 mV. According to experts, the microphone is not very good for professional use. It should also be noted that the set does not include a case. There is a directional microphone for wiretapping at a distance of about 14 thousand rubles.
Samson R23S device parameters
This is a compact and high quality microphone. According to experts, the model is quite often used by special services. The operating humidity of the device is 44%. At temperatures above 45 degrees, it is prohibited to use it. The diffuser of the modification is of the diode type, and the adapters for it are selected with two contactors. The filter of the model is standardly installed of a low-frequency type. The amplifier itself is used with a low-impedance adapter.
The threshold sensitivity parameter reaches a maximum of 4.3 mV. If you believe the arguments of experts, then the model copes with wiretapping at a distance of more than 150 meters. Failures in the operation of the amplifier are quite rare. The protection system at the microphone is applied class PP40. The price for this model starts from 10 thousand rubles.
Samson R25S series microphones
This is a professional quality microphone. According to experts, conductivitythe signal at low frequencies is acceptable. It is also worth noting that the device is allowed to be used in wet weather. The KE line output is used in this case.
The device also has a 3.5 mm jack. The battery at the microphone is of a 2 A lithium type. If you believe the arguments of experts, then the model does not cope well with high frequencies. Modification filters are used with copper insulators. The microphone is compact in size. The price for it starts from 9300 rubles.
Features of Sennheiser XSW 12
This microphone is not suitable for close listening. The impulse noise filter is of poor quality. However, it is worth noting the compactness of the modification. The microphone adapter is very secure. The sensitivity indicator is not more than 3.2 mV.
It is also worth noting that the diffuser rarely breaks in the model. The battery is used only for 3 A. The protection system is applied class PK40. The operating humidity of this microphone is 34%. The user can purchase goods for 8300 rubles.
