Roland R4 Pro
Mics & Preamps
Portable and rugged 96 kHz - 24 bit recorder
Ideal for creating superior high-quality stereo recordings
Offers solid-state storage - free of drive mechanisms
High quality built-in X-Y configuration electret condenser microphones
USB 2.0 mass storage device - easily connects with both PC or Mac
PCM-D1 Main Page
PCM-D1 Large View
Built-in Electret Condenser Microphones
The PCM-D1's electret condenser microphones have extraordinary high sensitivity and low noise characteristics. All microphone casing parts are cut from metal and fit together nearly seamlessly. During capsule manufacturing, each part is positioned and the front and rear openings are adjusted with 100-micron level precission. Peaks and dips within the mircrophones range are minimized so that acoustic energy is transmitted effectively to the diaphragm in each microphone capsule. The frequency response of the microphone is nearly 30 kHz. The microphones are positioned using an X-Y pattern and then angled toward each other with the left and right diaphragms close together, thereby covering a wide sound range with reduced phase shifts. The recorded sound from these microphones has good depth, perspective and provides a natural sounding stereo image.
Superior Audio Signal Path
The microphone amplifier provided for each channel is the Analog Devices AD797, which boasts ultra-low noise and distortion. A variable gain circuit is adopted for amplitude control, thus improviing the actual signal to noise ratio. The line amplifier provided for each channel is the Analog Devices AD8672. Analog and digital circuits are mounted on separate circuit boards and also separately powered to prevent interference between circuit blocks. The analog circuit achieves superior linearity so that the recorded sound is output faithfully.
Outstanding Build Quality
The circuitry of the PCM-D1 is protected by a body made of 1 mm thick pure titanium. By means of a pressing process called "drawing", titanium is shaped into a box to achieve a body rigidity that cannot be obtained through bending or using pressed aluminum. The use of drawn titanium minimizes resonance, which tends to occur when the body comes into contact with acousitc energy. The surface of the pure titanium material undergoes a process that increases the hardness of the material. The surface is then covered with an ion plating (a nitrate titanium coating that is resistant to scratches). The finished titanium surface is approximately ten times as hard as that of alumite treated aluminum. In addition, a distinctive arch-shaped polished stainless steel frame is provided to protect the microphones from impact damage. This rugged exterior protects the PCM-D1's circuits and microphones plus enhances the high sonic quality of the recorder.
Simple Uploading to Computer
The PCM-D1 conforms to the USB 2.0 Mass Storage Device standard and this recorder's native recording file format is .WAV. This means recordings can be rapidly uploaded to a computer and used in conjunction with most common audio production software.
High Quality Signal Processing
The PCM-D1 offers comprehensive signal processing features for location recording including a unique limiter function, a 200 Hz high pass filter and SBM (Super Bit Mapping) noise shaping. The digital limiter uses an independent audio buffer that contains audio 20dB lower then the audio processed in the normal recording signal path. With the PCM-D1 limiter enabled, when a loud sound suddenly occurs during recording, the over level part of the sound is automatically set within the range of the maximum input level (from the alternative -20dB buffer) in order to prevent distortion. This limiter function won't compensate for clipping of audio that is suddenly in excess of 20 dB; however, the sonic purity of the recording is fully maintained by not applying conventional limiter signal processing techniques. With the PCM-D1 High Pass Filter enabled, audio below 200 Hz is filtered out and not recorded. This function can be used to reduce noise caused by the flow of air-conditioning equipment, outdoor air, etc. With the PCM-D1 SBM function enabled (optionally used for 16-bit recording modes), Super Bit Mapping significantly increases the dynamic range acoustically by reducing noise that is particularly easy to hear within the human audible band. In order to improve the audio quality when converting 20 bit data into 16 bit, the top bits of information within the lower data (usually discarded when recording in 16-bit mode) are integrated into the 16-bit data track. This is done by shifting audible noise up into an inaudible higher frequency range.
Located at Oade Brothers Audio 548 Meridian Rd. Thomasville,
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