Audio Database

Image of the M77
Commentary

Compact 3-way speaker system.

A 23 cm cone type woofer is installed in the low range.
The vibration plate of this unit uses a rotary sheet-forming cone with a mass of 8g. This is achieved by a new sheet-forming method in which the cone paper fibers are arranged concentrically on the surface of the cone paper. In addition, the Young modulus in the circumferential direction is approximately twice that in the radial direction. In addition, by adding a zinc-die-cast reinforcing ring, sufficient strength is ensured even under Dainyu force.
Several air holes are provided in the cone paper of the dust cap to equalize air pressure and reduce harmonic distortion.
In addition, a magnetic circuit with a magnetic flux density of 11600 gauss (total magnetic flux 68000 maxwell) using a ferrite magnet of 110 φ x60 φ x15mm is adopted.
At the same time, the polyimide bobbin prevents the wake current caused by the metal-related voice coil, and the coil itself is also treated with super-heat-resistant treatment. This results in the synergistic effect of the voice coil with sufficient consideration for the temperature characteristics at the time of Dainyu force, and realizes a drive system with high input strength and low distortion factor.

Equipped with 3.5 cm soft dome type skoker in the middle area.
The diaphragm is coated with a special blend of viscoelastic material with a large tan δ. It uses a soft dome diaphragm that is strong against large input. It is coated on carefully selected fabric nine times in layers to maintain uniform density and thickness.
It is driven by a 35 φ voice coil using a heat-resistant aluminum bobbin and a strong magnetic circuit using a large magnet of 90 φ x45 φ x13mm. It realizes a high power of 80W and 91 db that eliminates the image of a dome.
The inside of the unit is filled with micron glass wool and sufficient air damping is applied to reproduce a clear mid-range with good damping.

A 2.5 cm dome type tweeter with an ultra-wide bandwidth of 1000 Hz to 45000 Hz is used for the high frequency range.
Carefully selected fabric is coated with a special blend of viscoelastic material with high tan δ four times with a precision of milligram to create a lightweight diaphragm with uniform density and thickness.
This is driven by a magnetic circuit using a 75 φ x32 φ x12mm magnet to achieve high power and high efficiency.

The baffle plate and back plate are 18 mm thick and the other is 15 mm thick. It is made with Motoki, and it is also filled with sound absorbing material to suppress unnecessary resonance. It uses a high-quality open pore finish cabinet.

It is equipped with independent Klix/Klukš top level control for the middle and high frequencies.

Model Rating
Method 3-Way, 3-Speaker, Airtight Type, Bookshelf Type
Units Used For Low Band : 23 cm Cone Type (W2538A)
For Middle Area : 3.5 cm Dome Type (MD402A)
For High Range : 2.5 cm Dome Type (TW321A)
Playback frequency band 37 Hz to 45000 Hz
Max Input 80W
Impedance 6 Ω
Output sound pressure 91dB/W/m
Crossover frequency 1100 Hz, 6000 Hz (W, MD12dB/oct, TW18dB/oct)
Cabinet internal volume 26L
External dimensions Width 280x Height 453x Depth 310 mm
Weight 12kg