Audio Database
Commentary

The ULM series 2-way speaker system adopts a newly developed magnetic circuit.

ULM stands for Ultra Linear Magnetic Path.

The center pole of the ULM series magnetic circuit has a notch in the center. By adding a thick copper plating or a copper cap to the notch, the nonlinear distortion of the magnetic material is eliminated. As a result, the distortion factor is less than 1/5 in the middle and high frequency range compared with the conventional magnetic circuit.
In addition, the voice coil uses a newly developed special synthetic resin adhesive, and the Woofer uses a metal bobbin to raise the allowable input.
In addition, by thoroughly examining the types and processing methods of pulp, which is the material of corn paper, we have realized a corn paper that is excellent both theoretically and audibly. In addition, the edge is made by combining a cloth with an ultra-thin special rubber that is hermetically treated and molded. This eliminates the valley that tends to occur around 400 Hz and realizes smooth characteristics in all bands. In addition, the lead wire is made of high-purity imported copper foil processed with a special resin, the life is extended more than 10 times.

A 20 cm cone type woofer is installed in the low range.

A 2.5 cm dome-shaped tweeter is installed in the high range.

Level control is mounted on the back.
The ULM1 switches the high-frequency output between 0 dB, -3dB, and -6dB.

The enclosure is hermetically sealed.
The exterior has a walnut finish, and the Sa RUNNET frame has a non-brim shape to eliminate harmful reflections and appreciation.

Model Rating
Method 2-Way, 2-Speaker, Airtight Type, Bookshelf Type
Unit For low band : 20 cm cone type
For high-pass : 2.5 cm dome type
Playback frequency band 60 Hz to 20 kHz
Output sound pressure level 89dB/W/m (New JIS)
95dB/W/0.5m (Old JIS)
Impedance 6 Ω
Maximum allowable input 50W (weighted pink noise 24-hour guarantee)
Crossover frequency 3.5kHz
External dimensions Width 292x Height 510x Depth 292 mm
Weight 8.2kg