11 February 2025

DENON DCD-1610 (1988) | 20bit S.L.C.

 

DENON DCD-1610 (1988) | 20bit S.L.C.

The DCD-1610 is a CD player equipped with a real 20 bit super linear converter. Unlike dynamic bit shift converters that use attenuators and switching circuits, this Real 20-bit converter has no nonlinear distortion factor, and the 0 cross distortion, which is a problem at low volume, is caused by the resistance error of the MSB, the most influential bit in D/A conversion. Therefore, the distortion is eliminated by correcting this MSB. In addition, a 2D/A system with independent left and right channels has been adopted to eliminate the L/R time difference. The digital filter uses an 8 x oversampling digital filter. By increasing the sampling frequency by 8 x, the band gap between the music signal and the noise signal is widened, making it easier to remove noise components. This allows the use of lower-order analog filters to improve sound quality. The power supply circuit consists of five independent power supplies. One digital section, one pickup servo system, one display system, and two audio systems are supplied separately to prevent sound quality degradation due to mutual noise and voltage fluctuations. A linear motor pickup is used for the pickup mechanism to enable high-precision tracing. The pickup mechanical base is made of BMC (Bulk Molding Compound), which has high rigidity and excellent vibration damping characteristics. In addition, this mechanical base is made into a double floating structure with low-repulsion rubber and spring to increase the vibration absorption effect. The unique double chassis structure with inner and outer chassis prevents external vibration, increases rigidity and eliminates resonance. In addition, the bottom surface is covered with another reinforcing rigid metal from the outside of the external chassis to increase vibration isolation. In addition, vibration from the top surface is suppressed by adopting large auxiliary rigidity metal for the top plate and inserting anti-vibration material below the top cover. Wireless remote control is included.

DENON DCD-1610 (1988) | 20bit S.L.C.

DENON DCD-1610 (1988) | 20bit S.L.C.

DENON DCD-1610 (1988) | 20bit S.L.C.


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10 February 2025

YAMAHA NS-1200classics (1987)

 

YAMAHA NS-1200classics (1987)

Released by Yamaha in 1987 the NS-1200classics features a 30cm diameter cone type woofer, a pulp cone rather than the new materials such as cross carbon that were mainstream at the time. In keeping with Yamaha's style, spruce wood was used as the raw material. Spruce is often used for piano soundboards, and is said to have a beautiful sound. Yamaha chose spruce from among the various trees in the world, and after much effort, completed an original 100% spruce pulp cone for the company's famous NS-690III in 1980. The woofer of the NS-1200classics inherited that technology. The magnetic circuit that drives the woofer uses an alnico magnet. The squawker was equipped with an 8 cm soft dome type unit. This soft dome unit was made of cotton as the base material, impregnated with phenolic resin, and thermoformed, achieving beautiful mid-range reproduction with excellent reproduction of acoustic instruments. The squawker's magnetic circuit used an internal magnet type with an alnico magnet, just like the woofer. The tweeter was equipped with a 3cm soft dome type unit. It was made of the same material as the squawker. In addition, the magnetic circuit was also an internal magnet type with an alnico magnet, like the woofer and squawker. The cabinet was a sealed type, heavy and sturdy, with a total weight reaching 42kg. All five sides except the back were finished with natural American walnut boards, with a mirror finish with urethane gloss paint, giving it a beautiful and calm appearance design. In addition, a dedicated speaker stand SPS-1200 was available separately.

Technical data:
Format: 3-way closed type
Speakers:
30cm cone woofer
8cm soft dome squawker
3cm soft dome tweeter
Crossover Frequency: 400Hz (12dB/oct) 4kHz (12dB/oct)
Frequency response: 40Hz to 30kHz
Impedance: 6 ohms
Input Power: 75W
Music Input Capacity: 150W
Output Sound Pressure Level: 88dB/W/m
External dimensions: 375W x 740H x 380Dmm
Weight: 42kg


YAMAHA NS-1200classics (1987)

YAMAHA NS-1200classics (1987)

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06 February 2025

DENON PMA-1010D (1987) | Digital - Class A

 

DENON PMA-1010D (1987) | Digital - Class A

The PMA-1010D from Denon is a pure A-class pre-main amplifier with built-in D/A converter. It operates in class A up to 1W output (8 Ω) for low distortion and high quality sound. In order to cope with the temperature rise of class A amplification, the fin of the heat sink is doubled, and the block is firmly combined with a copper plate with good heat conduction and fast vibration damping, to achieve high heat resistance and no resonance. The power supply section is equipped with a large power transformer, fast recovery diode for high-speed rectification, and 48,000 μ F electrolytic capacitor for audio. Stabilization is achieved by the adoption of balanced floating power supply system. A large heat sink separates the power supply from the main signal system. The built-in D/A converter uses a 4 DA push-pull super linear converter. This converter consists of two carefully selected D/A converters for the left and right channels, each of which functions like a class A push-pull. It also consists of a four times over-sampling digital filter, a sample-and-hold circuit, and an LC-OFC 7th-order C. A. L. P. (linear-phase) low-pass filter. The digital input section consists of coaxial digital input and optical digital input systems. Equipped with a digital input selector using a high-speed C-MOS logic circuit, it automatically identifies CDs, DAT and DBS and transmits them to the D/A converter. In addition, in order to eliminate interference with the converter section, "opto-isolated" method by optical coupling is adopted. The power cord features polarity display. Technical data: Rated power 140W/ch 8ohm | THD 0.003% | Output bandwidth 5Hz-100kHz | Dimensions (WxHxD) 474x174x396mm | Weight 22kg

DENON PMA-1010D (1987) | Digital - Class A

DENON PMA-1010D (1987) | Digital - Class A

DENON PMA-1010D (1987) | Digital - Class A

DENON PMA-1010D (1987) | Digital - Class A



DENON PMA-1010D (1987) | Digital - Class A