Audio Database

SP-301
Commentary

This is a speaker system that challenges the possibility of a basic all-cone 2-way system without using new materials or new methods.

In addition to conventional measurement and analysis in an anechoic room, we conduct hearing tests in a listening room. The D-series wide-range DC pre-main amplifier is used for viewing.

A 32.2 cm cone type woofer with corrugation is used for the low range.
Corn paper made from foreign softwood pulp is a lightweight, rigid, non-pressed straight type with moderate internal loss.
In addition, by adopting an aluminum die-cast frame of sufficient strength on the edge of the up-roll type, which is thermo-molded with special foamed resin, harmful resonance modes are suppressed and the influence on other units is suppressed.
The magnetic circuit uses a 120 φ ferrite magnet, which is combined with a heat-resistant voice coil to improve linearity and transient characteristics.
In addition, the basic characteristics have been improved by giving sufficient consideration to details such as damper material, impregnation agent and adhesive.

A 3.6 cm cone type tweeter is used for the high range.
The cone shape is a straight type with good teeth, and the material is determined through repeated hearing, achieving wide directional characteristics with small-diameter cone paper.
A newly developed wave-shaped edge with good directional characteristics is used for the edge, and a die-cast frame is used for the frame.
The magnetic circuit uses an 85 φ ferrite magnet with a total flux density of 19600 Maxwell.

LC type is used for the network.
In particular, the core for the woofer uses an annealed large laminated core. In addition to suppressing the generation of magnetic flux leakage, we also examined the arrangement of parts to avoid electromagnetic induction such as coils and capacitors, thereby reducing the adverse effect on sound quality.
It is also equipped with an attenuator that can adjust the level of the high frequency range.

The enclosure uses a bass reflex type with acoustic particle board.
The internal structure is fully reinforced, three types of sound absorbing materials are effectively used, and each unit is installed in a symmetrical design to improve directional characteristics.
This item is finished with a new georgette crepe wall finish.

Model Rating
Method 2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type
Unit For low band : 32.2 cm cone type
For high pass : 3.6 cm cone type
Playback frequency band 35 Hz to 20000 Hz
Maximum allowable input 75W
Impedance 8 Ω
Output sound pressure level 93dB/W (New JIS, 1m)
Crossover frequency 1700Hz
External dimensions Width 390x Height 640x Depth 305 mm
Weight 18.3kg