Marantz DAC-1 160,000yen(1988 release) 146,000yen(around the 1989 time)

　
Digital-audio control amplifier aiming at daring to limit the music source and demonstrating the power.
Many noises (audio frequency out-of-band noise) were mixing, and the audio signal which the PCM treatment of compact disk, the DAT, etc. was carried out, and passed the digital analog converter was developed at the origin of the thought of sending the signal which removed it to power amplifier.

The low pass filter which followed compact-disk technology of the Philips Marantz group is prepared in an input stage, and the cross modulation according only the signal below a sampling frequency to the RF of through and an amplification part is suppressed.

By forming buffer amplifier before a master volume, a using of a low-impedance volume is enabled and the variation of the noise level generated with the location of a volume is reduced.

The transformer joint multifeed back circuitry which used as the base the output circuitry which reduces moderately unnecessary bands other than 20Hz - 20kHz, and takes out only an audio signal smoothly, and which is adopted as LHH2000 is adopted.
Furthermore, it is possible by giving a gain of +14dB to have a margin and to drive power amplifier.
Moreover, it has succeeded in perfect separate-ization of the gland of a chassis, and the gland of a power range system by having carried the output transformer.

By adopting a dual winding scheme as the secondary winding of an output transformer, the BTL drive of power amplifier is possible by outputting the signal with which about 180 degrees of a right phase output and a negative phase output of phases differed to output 2, and using these two outputs. (It is exclusively for Marantz power amplifier)
Moreover, the connection of an absolute phase is possible by using properly the output from which a phase differs.
By using output 2, a negative phase drive of right phase power amplifier and a right phase drive of a negative phase speaker are also possible.

The component partses which investigated quality are adopted also as each part for tone-quality pursuit of an ideal.
A toroidal transformer is adopted as a power transformer and the super permalloy core is adopted as an output transformer.
Moreover, nonmagnetic gilding is adopted as an input/output terminal. Furthermore, the Naked of aluminum is adopted as a volume thumb in order to prevent the sound pressure energy of the speaker called a vibration of the whole amplifier, especially a volume thumb, and cause of an oscillation.
In the printed circuit board, the insulation resistance value is raised using the glass epoxy group board by which the flip coat was carried out.
Furthermore, the copper plating chassis of non-magnetic material is adopted as a chassis, and in order to lower Resonance, the 8mm aluminum front panel and two 1.3kg die-casting side panels are used. In order to press down a resonance moreover, a 4mm aluminum top cover is adopted.

The play combined with digital line transformer DLT-1 by inheriting the design concept of the output transformer of LHH2000 is also possible. 

Form	Digital-audio control amplifier
Input sensitivity/impedance	300mV/47kohm
An Output power/impedance	1.5V/50 ohm
THD (20Hz - 20kHz)	0.03%
SN ratio (A curve)	110dB
Power consumption (Electrical Appliance and Material Control Law)	8W
Power source	AC100V, 50Hz/60Hz
Dimensions	Width 250x height 84x depth of 211mm
Weight	4.2kg

Posted in: Marantz, Marantz-Amplifier, Marantz-Amplifier-Separate, Marantz-Amplifier-Separate-Control