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This speaker system adopts the dumped bass
reflex method.
A-30mkII and A-25mkII have almost the same
design except for the diameter of woofer.

The dumped bass reflex is a semi-braking
system with a special glass fiber filled in the
opening of the grating in the lower part of the
baffle to give air to the woofer. The inner wall
of the enclosure is covered with two layers of
glass fiber and rock wool with different sound
absorption coefficients to reduce internal
reflection.
This structure eliminates over-braking of the
woofer, which tends to occur in a completely
enclosed type, and suppresses the effect of
resonance at the opening, which is pointed out
as a defect of the bass reflex type.

A 18 cm cone type woofer is installed in the
low range.
Instead of the heavy vibration system of the
long voice coil often seen in the completely
enclosed type woofer, a light vibration system
with small amplitude is adopted.

A dome-shaped tweeter is installed in the high
range.
Uses lightweight diaphragm as well as woofer.