Making of M1

By Man-Sun Huh
20 Jan 1998

Cabinet and network

Cabinet drawing showing the front and side Fig. 3. Cabinet drawing .

I wished system Qtc around 0.577 (Bessel Alignment). This low Qtc can give very detailed response what I like. The optimum volume was 16 liter but I designed internal volume 20 liter and Qtc is measured 0.53. The network will raise Qtc somewhat.

Network
The crossover network Fig. 4. The crossover network Fig. 5. Picture of the crossover.

Here are some criteria for network design:

1. The simpler, the better. Only 8 elements are used. In tweeter signal path, single capacitor and resistor are used for pure sound.
2. Low crossover point (1800Hz). It can deliver a wide dispersion. But it need reliable tweeter such as D2905/9300.
3. Acoustically 4th. order Linkwitz-Riley filter slope around crossover point.

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