Product survey
The basic model is a
3/4" soft dome tweeter with diameter ø94 mm, total depth 41,5 mm, closed box of its own, with built-in different
chambers for maximum control of resonance phenomenon's. It has a black rough
color finish.
The type number:
DOME
TWEETER type D20dd-dbzz-xx:
* D = Dome tweeter.
* 20 = 20 mm dome diameter.
* dd = physical
all over diameter
* db = sensitivity in dB.
* zz = nominal
impedance.
* xx = version number
An example: D2094-9008-44 = 20mm dome, 94 mm diameter, 90 dB SPL, 8 ohm
nominal, and special version no 44 (identifying for instance a custom tailored
specialty).
Main groups, types and differences:
We
produce different version with different characteristics. As a general rule, we
produce two groups, each group offering an optimized standard version,
"OWI" and "OWII", both among the most excellent 3/4"
(20 mm) soft dome tweeters available in the world market.
OWI. This first group is especially well damped. With soft roll
on roll off and sensitivity around 87 dB. Characterized by
extremely low distortion and wide frequency area. Controlled drop off
far above 20 kHz.
Type:
D2094-8708-03 (87 dB, 8 ohm).
Top level in this
group is "OW I".
OWIIx. This second
group is more lightly coated. With very analytic sound
reproduction and extremely fast-settling step response and sensitivity around
90 dB. Controlled drop off just above 20 kHz.
Type:
D2094-9008-03 (90 dB, 8 ohm).
Top level in this
group is "OW IIx".
OW3 and 4. This third group is medium to heavy coated. With very analytic
sound reproduction and extremely fast step response, sensitivity around 90
dB.
Controlled drop off just above 20 kHz.
Type:
D2094-9008-04 (89 dB, 8 ohm).
Top level in this
group is "OW 3 and OW4". (they
replace the now obsolete old OWIII)
Some prefer
one and some the other. It's a kind of religion. All look the same in the
physical design, except for the dome itself, which is visibly different.
Especially OW3 and OW4 appear rather different because of their special color.
If you are still doubtful with respect to differences in
sonic quality between the tree types, you should read some more details here, but I suggest you
continue reading below for more details of general technical nature valid for
all types......
Exponential semi horn:
The
special exponential semi horn design, of which the dome diaphragm itself is an
important part, features an excellent frequency and phase response.
It goes like this:
As
frequency goes higher, only smaller and smaller parts of the dome diaphragm
near the voice coil actually moves. So, gradually from being a dome radiator at
lower frequencies, the unit turns into a ring radiator at increasing frequency.
During this transformation, the dome top itself becomes part of the horn structure
at higher frequencies.
This technique results in very advanced acoustical control, offering great
response linearity, low distortion and impressive phase linearity.
The magnet system:
The magnet system is driven into a saturated working condition. This means that
the highest degree of linearity is achieved.
The magnet is over dimensioned making it impossible for the soft magnetic iron
parts (top plate and pole piece) to handle all of the magnetic flux, resulting
in the fact that the air gap magnetic characteristics turn in to a
close-to-linear phenomenon without hysteresis problems, and with very uniform
magnetic distribution in the gap. At the same time influence from variations in
magnet size is eliminated.