Design Features The special form of the microphone body, with a relatively long and narrow tube behind the capsule, results in a sound environment with minimal reflective interactions directly in front of the capsule. Weight The microphone body is made of high-grade stainless steel, which provides high mass. As a result, vibrations and resonance from the microphone body are minimised. Materials Only materials of the highest quality are used to ensure maximum reliability under tough professional use. This means: · use of gold-plated contacts only · electronic components are selected for their proven quality in audio specific equipment, handpicked, and individually tested. · the microphone membrane is made of titanium for the highest possible sensitivity and durability · oxygen-free copper cables between the microphone and the power supply · specially coated circuit boards for optimal protection against damp and moisture · use of a special process for the production of printed circuit boards, which ensures the purity of the copper pathways, resulting in greater stability and performance of the circuit design. Power supply As part of the initial Sonodore philosophy, the RCM402 is 'active' powered via a separate power supply (PS-402), instead of using standard phantom power. Phantom-fed microphones are inherently less suitable for high-quality audio usage since they work as compressors: when, for instance, high dynamics are required, strong demands are made on the current supply of the phantom. As a result, the current supply drops drastically and the stereo image and frequency response collapse with it. To avoid this, the RCM-402 is available in a version with a separate power supply which allows a high-grade and exceptionally low-distortion amplifier to be placed directly in the microphone body. |
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| Experience teaches that if omnidirectional microphones are placed relatively far from the musical instruments that you want to record, the result sounds somewhat dull. This also applies to the Sonodore RCM-402. To solve this problem, Rens Heijnis developed a grid that boosts the higher frequencies more than the lower ones; it can be considered an acoustical tone control. The standard grid of the Sonodore RCM-402 (type PG-68) provides an almost flat frequency characteristic. The PG-78 grid, on the other hand (made of titanium) shows a rise of the high frequencies with a peak at approximately 15 kHz and a gain of 3.5 dB. These values should be added to the frequency characteristic of the Sonodore RCM-402 used in combination with the PG-78 grid. The increase of the high frequencies does not introduce any additional noise, which means that the signal-to-noise ratio even improves slightly when the PG-78 grid is being used. The directional characteristic is slightly influenced by the PG-78: from 5 to 10KHz the directional characteristic is a little better than it is with the standard grid (0.1-0.3dB); at 20kHz, the directional characteristic is slightly worse (depending on the angle: 0.1-1.5dB). The PG-78 differs from the standard grid in height (7.8 mm compared to a 6.8 mm standard grid), it has no slots at the edge, and it has a slightly different tint(less shiny). | |
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| For the RCM-402, for a boosted frequency response at approximately 20kHz. Together with the standard grid and the PG-78 there now is a wide range of possibilities for acoustic equalizing the Sonodore microphones. The PG-88 delivers a virtually ideal frequency response with a slight boost of 2.5dB at 20kHz gradually coming down to 0.7dB at 30kHz which is often perceived as delivering a more 'open' sound stage. For use at greater distances than 1 meter, this proves to be a very nice feature indeed. Many mastering engineers add this bit of 'top-end' in recordings... The Sonodore can add this now right at the source. All other qualities of the RCM-402 stay intact, like the exceptional impulse response and omnidirectional character of the microphone. | |
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