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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

D 450

D 450 is a 2½ way dual bass reflex system featuring a 6½"

woofer, a 6½" mid-woofer and a 1" DCD tweeter.

The 2½ way configuration has sort of become a hallmark of

Jamo. We are using this configuration in a number of products

starting with our highly acclaimed D 870 speaker.

The reason for choosing this configuration is that it grants you

the best of two worlds: The tweeter and mid-woofer reproduce

the full frequency range, so, this 2 way system is "securing" the

coherent, harmonious and smooth sound well-known from

traditional 2-way systems. Then the additional woofer blends in

below 150Hz to add the extra cone area and power handling

needed to give full fidelity in the low bass.

The dual bass reflex configuration means

that the cabinet of D 450 is divided into two

chambers – one for the tweeter/mid-woofer

and one for the designated woofer.

This gives several advantages: First of all the

sound pressure inside the cabinet from the

woofer does not influence the mid-woofer

and vice versa. This of course eliminates

colouration and thus results in cleaner

sound reproduction.

Furthermore, each chamber is optimized for drivers intended to work

in it. The internal partition is angled so that the mid-woofer is given all

possibilities of "breathing" freely whereas the fact that the woofer

couples acoustically to the cabinet adds "acoustic" weight to the

moving mass of the woofer and thus attenuates the woofer around

100Hz.

Finally, the partition wall also works as an internal bracing of the

cabinet and thus reduces cabinet vibrations – to ensure that what you

hear is the sound from the drivers – not from the cabinet vibrations!

D 450 features gold plated bi-wiring/amping terminals. With the upper terminals you

connect to the tweeter whereas the lower terminals connect to the mid-woofer and

woofer. This split was chosen in order to separate the heavy current flow in the midrange

and bass from the more delicate signal to the tweeter. The bi-wiring/amping facility gives

you all the possibilities of "tweaking" the sound balance.

The D 450 can be placed either by using the adjustable spikes securing a good mechanical

coupling to the floor independent of floor materials or, if you prefer to decouple it from

the floor, by using the enclosed rubber absorbers.