JAMO D 7SUB, Брошюра

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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.
This
filter compensates for the room influence at low
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