ONKYO D-77MRX

Commentary

A speaker system developed with Premium Technology introduced everywhere to realize "improvement of dynamic S/N".

A 30 cm cone type woofer is installed in the low range.
The diaphragm uses a silk OMF (ONKYO Micro Fiber) diaphragm. This material was developed to be an ideal material that is lightweight, highly rigid and has high internal loss. It uses a matrix structure made of silk fiber and thermosetting resin. This reduces the inherent noise generated from the diaphragm itself, and the shape has been continuously improved to further expand the dynamic range and reduce distortion.
In addition, damper material with less natural resonance is used.

Equipped with 12 cm cone type skoker in the middle area.
The diaphragm is equipped with silk OMF diaphragm as well as woofer.

A 2.5 cm compound tweeter is installed in the high range.
The vibration plate is a combination of 2.5 cm aluminum magnesium alloy dome and 4 cm bicycloscone.

The newly developed S line edge is used for the edge part of the unit.
In conventional edge design, the absorption of propagating waves and the superiority of the amplitude linearity of the diaphragm were emphasized. However, the reflection due to the mismatch of mechanical impedance at the junction with the diaphragm caused the loss of spatial information. We determined that the cause was the shape of the edge, and repeated data analysis and hearing to realize the shape with the least reflection of propagating waves.

MDCT (magnetic distortion reduction technology) is adopted for the magnetic circuit.
The speaker unit converts electrical signals into audio signals in accordance with Fleming's Law. However, in the conversion process, distortion is generated due to complex mutual interference of magnetic fields. To solve this problem, we are pursuing technology to prevent interference of DC / AC magnetic fields by improving the symmetry of magnetic flux, and we are reducing various types of distortion called non-linear distortion, magnetic distortion, and current distortion.

The S. G. L. (Steady Ground Level) type isolated wiring network is used for the network part.
This system uses an independent board for each unit to enable separate layout and eliminate electromagnetic interference. In addition, an S. G. L. type one point concentrated circuit is used for the ground, which is the reference of audio signals, to prevent current from flowing in the ground line and to enable more realistic reproduction with a constant ground potential.

The enclosure uses a bass reflex system.
MDF is used for the entire surface, and 42 mm thickness is secured for the front baffle which especially requires strength. In addition, a dedicated wooden back chamber is incorporated in the back of the skoker to form an independent space, eliminating mutual interference between units due to pressure changes in the enclosure.

The speaker terminal uses a gold-plated brass scraping terminal that supports banana plugs.

There was a speaker stand as an option sold separately.
This stand has rivets on the bottom to prevent vibration interference between the speaker stand and the floor.
(If this rivet is used, scratches or marks may remain on the floor surface.)

Model Rating

Method	3-Way 3-Speaker, Basref System, Bookshelf Type, Anti-magnetic Type (EIAJ)
Units Used	For low band : 30 cm cone type For Medium Range : 12 cm cone type For high frequency : 4 cm compound type
Playback frequency band	30 Hz to 60 kHz
Max Input	150W
Impedance	6 Ω
Output sensitivity level	90dB/W/m
Crossover frequency	500 Hz, 3 kHz
Cabinet internal volume	56.0L
External dimensions	360 mm wide x 660 mm high x 380 mm deep (including RUNNET and terminal projection)
Weight	25.0kg
Sold separately : Speaker Stand AS-77FRX (1 set of 2, ¥ 36,000)
External dimensions	Width 360x Height 200x Depth 337 mm Riveted : Height 207 mm
Weight	6.5kg