DENON SC-R99

Commentary

In order to realize the concept that "only the diaphragm vibrates", this speaker system uses enroger technology to suppress unnecessary resonance.

First, it adopts a double D. A. S. (Dynamic Acoustic Scatter) structure.
Inside is DENON's unique enclosure combined with heavy porous ceramics, pursuing the ideal of "no standing wave" and "no plate vibration".
In the double D. A. S structure, baffle plate, top plate, both side plates and bottom plate are strongly bonded with super-synthetic porous ceramics. The weight of porous ceramics is added to five plates, and the bonding between the plates is strengthened to suppress vibration of the entire plate.
As a result, the frame of the woofer is fixed to a rigid baffle with a total thickness of 70 mm (40 mm baffle plate + 30 mm porous ceramics), and extremely precise piston motion is realized without instantaneous high power or with the frame and the enclosure getting shaky.
In addition, the porous ceramics dissipates and absorbs the standing waves generated inside the enclosure, improving the low-frequency quality.

Second, it uses the R. M. M. (Rigid Monocoque Mount) structure.
The tweeter has an airtight structure with a frame and a magnetic circuit embedded in a baffle plate, and the squaker is firmly mounted by a total of 65 mm consisting of 40 mm baffle and 25 mm sub-baffle.
This reduces displacement and vibration of the magnetic circuit and frame caused by the reaction when the diaphragm is driven, and transmits the driving force purely to the diaphragm, improving the S/N and sound rise.

A 32 cm cone type woofer is used for the low range.
The diaphragm uses a boron fiber diaphragm that uses boron long fiber for the first time in the world. It is driven by a magnetic circuit that uses a barium ferrite magnet with a straight line of 180 mm and a thickness of 20 mm.
In this diaphragm material, boron long fiber and carbon paper are fused on the back of cross woven long fiber carbon (cross carbon). The high elasticity and high rigidity unique to boron and carbon improve the sound propagation speed. In addition, different materials are combined to ensure internal loss.

A 6.5 cm dome type skoker is used for the middle area.
The new α - boron diaphragm technology is also been applied to the SCORCAR. A boron compound and titanium oxide are plasma jet welded on a base of titanium, which is light and highly rigid, to ensure an appropriate internal loss.
The diaphragm is supported by tangential edges and driven by a large strontium magnet with a direct 156 mm thickness of 20 mm.
In addition, in order to control the back pressure of the diaphragm, air vent holes are provided in the center pole and the top plate to improve the fluctuation of frequency characteristics, and the effect of the back sound pressure from the woofer is eliminated by the adoption of a firm back cavity.

A 2.5 cm hard dome type tweeter with New α Boron is used for the high range.
New α - Boron, which is made by fusing boron compound and titanium oxide on the surface of duralumin foil by plasma jet method, improves sound propagation speed and prevents the squeal of diaphragm material.
By improving the shape of the diffuser, we have also improved the directional characteristics of the ultra-high frequency range.

The network uses carefully selected audio-only parts such as an independent circuit for each unit and a low-loss, low-distortion silicon steel plate for the choke coil.
The attenuator is eliminated in order to improve the purity of the signal transmission system.

The enclosure uses a needle-resin-based high-density particle board with a Gerald Ebony wood finish.

Model Rating

Method	3-Way, 3-Speaker, Bass reflex system, Bookshelf Type
Units Used	For low band : 32 cm cone type For Middle Area : 6.5 cm Dome Type For high-pass : 2.5 cm dome type
Frequency characteristic	25 Hz to 50 kHz
Impedance	6 Ω
Maximum Input (EIAJ)	200W
Average output sound pressure level	91dB/W/m
Crossover frequency	500 Hz, 4000 Hz
External dimensions	Width 415x Height 715x Depth 417 mm
Weight	62kg