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Cabinets 

 

All D 4 cabinets are made of heavy MDF board, a solid and resonance dead base for the 

drivers to work in. 
 

However, the most remarkable cabinet feature is probably the 

Double Curved front baffle. 

It is common knowledge that one of the most rigid constructions 

at all is a round shape; a ball, an egg etc.  
Therefore the front baffle of D 4 has been “cut out” from a giant 

ball and thus the name  “Double Curved” front baffle. It consists 

of a shell, moulded from foamed ABS plastic, mounted on an 

MDF board – with resonance damping foam in between. All 

materials are characterized by excellent acoustic properties i.e. 
high internal damping. This prevents vibrations from “travelling” 

from one driver to another.  

 

Also, the planar design gives optimum working conditions, i.e. a 

minimum of diffractions, for the asymmetrical placed tweeter. By choosing the 
asymmetrical design, no distances from cabinet top and sides to the tweeter are identical 

and thus edge reflections do not accumulate. The result is a crystal clear treble 

reproduction – which is essential in order to benefit from the extended treble contents of 

the new multi channel sound formats. 

 
The finish of the D 4 is a light anthracite lacquered front baffle combined with black ash, 

light – or dark apple wood finished cabinet sides.  

Summary of Contents for D 4 Concept

Page 1: ...Technical Description Jamo D 4 Concept...

Page 2: ...t Contents 1 General system description 2 The products 2 1 D 400 2 2 D 430 2 3 D 450 2 4 D 4CEN 2 5 D 4SUB 3 Driver explanation 3 1 Tweeter 3 2 Mid woofer woofer 3 3 Sub woofer 4 Electronics D 4SUB 5...

Page 3: ...ice of very high quality materials and development of completely new and very powerful driver units The sound reproduction of the D 4 is very detailed clear and open in the entire spectra with a large...

Page 4: ...der filtering D 430 D 430 is a 2 way bass reflex system featuring a 6 woofer and a 1 DCD tweeter This compact bookshelf speaker can be placed on a bookshelf or on the designated D 4FS stand providing...

Page 5: ...n 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 possibili...

Page 6: ...6 woofer So actually by reducing the cone area we achieved exactly what we wanted acoustically identical drivers and thus a seamless transition between the front speakers The D 4CEN is of course magn...

Page 7: ...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 bu...

Page 8: ...ly is in opposite phase resulting in zero or very limited output from the tweeter By clamping the middle of the dome and only using a ring of the cone area on each side of the voice coil the tweeter i...

Page 9: ...sult is a cone with very well controlled break up modes resulting in extremely low distortion all over and a very open and detailed midrange for optimum voice reproduction The basket is made of magnes...

Page 10: ...re lightweight 2 layer voice coils in order to achieve maximum attack the ability to start and stop precisely and minimum distortion these acoustic properties are of utmost importance for optimum voic...

Page 11: ...is going to be fed by a 400 W amplifier The foam surround allows fast movement at its low frequency working range Electronics D 4SUB Amplifier The D 4SUB features a 400 Watt Class D amplifier that op...

Page 12: ...ween All materials are characterized by excellent acoustic properties i e high internal damping This prevents vibrations from travelling from one driver to another Also the planar design gives optimum...

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