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スピーカーシステム JAMO D 4CENのPDF 技術説明をオンラインで閲覧またはダウンロードできます。JAMO D 4CEN 12 ページ。 Jamo speaker technical description

(Sub)Woofer

The 8" woofer features a vented magnet system and a Ø 38 mm / 1½" aluminium voice coil

former. The 4-layer voice coil is 28 mm / 1.1" long allowing linear excursions up to +/- 10

mm / 0.4" – and still with >70% of the B*L product available!

The foam surround allows fast movement at its low frequency working range.

Amplifier

The D 4SUB features a 400 Watt Class D amplifier that

operates at a highly efficient 85%. This means that 85% of

the power consumption is dedicated to the speaker, and

only 15% is dissipated as heat.

It is manufactured from SMD components. The

advantages are that signal paths are kept very short and

that the electronics is much more resistant to the shocks

and vibrations that arise inside a subwoofer. The results

are better sound and a prolonged lifetime for the

subwoofer.

Auto On/Off

Forget all about the subwoofer once it is connected as this feature automatically sets the

subwoofer in stand-by after approximately 20 minutes without input signal.

The "start up" sensitivity is 3mV and it stays on as long as the signal is above 1mV.

Phase and Cut-off controls

Place the subwoofer where it is most convenient - the controls ensure that the sound from

the subwoofer can be adjusted to blend seamlessly with the sound from the rest of the

speakers.

The magnet system features a vented pole piece in

order to avoid over/under pressure behind the dust

cap (mechanical damping) when the cone is moving.

The cone is made from

when making paper cones, the water is pressed out of

the cone simply because letting it air-dry is way too

time consuming.

However, there is a quite significant advantage from

spending the extra time. When letting the paper air-

dry, the cone is approximately double thickness

compared to a pressed cone. Still the low weight is

maintained, but due to the increased cone thickness,

it is simply more rigid – an extremely important

feature for a long throw woofer that is going to be fed

by a 400 W amplifier . . .

air-dried paper. Normally