Audio Database

DA-Q100
Commentary

This is a 4-ch decoder dedicated to components with an SE logic circuit mounted on the decoder section that contains three types of matrices (RM, SQ, and QM-4), which dramatically increases the separation degree of the matrix 4 ch.

The SE logic circuit is used to improve the crosstalk problem of the matrix 4 ch.
This circuit uses the main signal to create a negative-phase signal, eliminating and suppressing only the crosstalk components that leak into each channel, and achieves discrete-like separation.

This logic circuit is based on the principle of the logic circuit. First, a comparison detection circuit detects the magnitude of the signal between the opposite channels and converts it into a DC control signal. This signal is sent to a gain control circuit (gain control), and the main signal is controlled to become an erase signal with phases opposite to each other of 0 ° and 180 °. Then, the main signal (the output of the matrix) and the erase signal are mixed by an addition circuit, and the crosstalk component is eliminated.
This structure ensures distortion-free sound quality unlike AGC, which directly controls the gain of the main signal, because the main signal is adjusted without any modification.

The decoder has built-in RM (Regular Matrix), SQ and QM-4 matrix, and is designed for wide adaptability to 4 ch playback.
As a result, most commercially available records can be played in 4 ch by switching the switch.
The CD-4 system can also be used as a 4-ch control center by installing a demodulator connection terminal.

Equipped with terminals for discretes, you can enjoy discretes just by connecting a tape deck.

It uses 4 large level meters of front and rear.

Model Rating
Type 4-channel SE decoder
Regeneration system General Matrix Method (Regular Matrix)
CBS type matrix method (SQ matrix)
Discrete method
QM-4 Matrix Method
Input signal level 200mV(rms)
Output signal level Forward 2 ch : 200 mV (rms)
Input impedance 100k Ω or more
Frequency response 30 Hz to 30 kHz ± 1 dB
Harmonic distortion 0.3% or less
Separability Between each channel : up to 15 db
Power supply voltage 100 VAC, 50Hz/60Hz
External dimensions Width 400x Height 144x Depth 260 mm
Weight 5.8kg