JAMO D 7LCR Opuscolo - Pagina 7

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However, under certain circumstances this can create a problem, which is why THX Ultra2

decoders feature a Boundary Gain Compensation filter.

filter compensates for the room influence at low

This

frequencies, as any room amplifies the lowest frequencies.

The magnitude of the room's amplification depends on

the room and where you are positioned – normally it

increases the closer you get to a wall.

This can result in too high bass level from approx. 60 Hz

and increasing downwards.

In the range between 20-30Hz it peaks up to 5-10dB in an

average room.

At first impression this could sound really impressive, but especially when listening to

music the sound can be "boomy" and rather annoying.

The Boundary Gain Compensation starts at 55 Hz -3dB and drops to –10 dB at 20 Hz.

For users of THX decoders without Boundary Gain Compensation, the D 7SUB has a quite

unique feature:

Boundary Gain Compensation is built into the D 7SUB on a separate input, thus granting

optimum benefit from the D 7 System with existing equipment.

The level control is placed on top of the D 7SUB elegantly integrated in the design. When

it is turned to the point of THX reference level a LED lights up – indicating the THX

specified input sensitivity.

Drivers

Tweeter

The tweeter was chosen for 3 main reasons:

1. Extremely low distortion

2. Totally freedom of accentuation of "s" sounds.

3. The low range extension

The 1" tweeter features a completely new

design of the diaphragm/dome called

Dual Concentric Diaphragm.

The coated textile diaphragm looks like

two rings, one on the "inner" and one on

the "outer" side of the voice coil – hence

the name "Dual Concentric".

The quite eye-catching centre plug has

two purposes: It is a wave-guide and it

clamps the diaphragm.

D 7 tweeter cut through view