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Product survey 

Technical description 

The basic model is a 3/4" soft dome tweeter with diameter °94 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.

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