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DM-8a

Dreams Super-Wideband AMT Driver

 

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 The revolutionary DM-8a AMT Driver

 

            Ever since Mark & Daniel® had successfully developed his first- and second-generation Dreams AMT (Air Motion Transformer) drivers, from DM-1 to DM-7, M&D has made many significant breakthroughs on AMT applications and has also won the high praise of global sound experts and audiophiles.

 

            Yet Mark & Daniel does not stop there!  From late 2020, we have launched the revolutionary third-generation AMT product: the DM-8a Dreams super-wideband driver!  Based on the latest engineering materials plus M&D experiences on precision assembly processes, the new invented DM-8a Dreams driver is a stunning super-wideband AMT audio driver capable of operate within a 200Hz-19KHz bandwidth, reaching to 6.5 octave frequency ranges with high C/P value, hi-fi performance, modular integration as well. There has no other similar and/or competitive AMT products ever made in hi-fi industry.

 

            Since this AMT driver has the remarkable ability to regenerate over 200 Hz-19KHz, it ensures all music essence can be reproduce from just one sound driver, and yields the unparalleled true hi-fi reproduction due to AMT operation mode for excellent transient response, high resolution, coherently resistive impedance, and without crossover distortions between different drivers. In addition, the invention of low-end extension down to 200Hz represents another major significant improvement for hi-fi system application: with DM-8a AMT driver, it can be directly match with the sub-woofers popular to the market that may effectively simplify for hi-fi sound system design and complexity from now on!


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How does DM-8a Work
 
            The DM-8b driver is reliable and durable, capable of sustaining high dynamic sound output to produce true super-wideband sound reproduction; the basic design of DM-8a is  very similar to M&Ds DM-7 AMT driver except DM-8 has employed the special diaphragm with an innovated structure design to achieve the super-wideband characteristic.

* DM-7 AMT driver: http://www.mark-daniel.com/index.asp?Proid=28&table=sdr


            Constructed with 36 micro elements, forming a 15 micron (0.0006) aluminum ribbon in thickness, attached onto a super-thin polyimide diaphragm and pleated into shape, then meticulously fixed onto a special acoustic frame; this symmetrical ribbon array directly pumps out (or draws in) a sufficient quantity of air driven by the musical current signal, responding to high dynamic, acoustic power, pushing super-wideband frequencies down to the amazing 200Hz and up to 19KHz then.


            This integrated DM-8a AMT tweeter is therefore, a true over 6.5 octave wideband driver and has a large composite diaphragm that constitutes over 38 times the driving surface of the conventional 1 dome tweeter folded into this slim-shaped AMT sound reproducer. This unique driver is therefore, allowing for high power handling, good SPL output with low FMD pollution throughout the entire operating bandwidth, under such a compact size.

*  FMD: http://www.mark-daniel.com/index.asp?ID=18&table=Phylosophy

  
            DM-8sdiaphragm is sunk into an extremely strong magnetic loop with large NdFeB magnets creating a sophisticated and expensive structure to ensure proper operation of the driver, thereby yielding an outstanding 30 degree horizontal dispersion characteristic within a 200Hz to 8KHz (-5dB) bandwidth. Vertical dispersion is low, effectively avoiding undesirable reflections from ceilings and floors for better clarity and imaging under all listening conditions; this sharp vertical dispersion characteristic may also be beneficial for building the line-array tower to cut down sound interference between the drivers.
  
           DM-8a has a typical DC impedance at 4.0 Ohms (0.2 Ohms) and is completely coherently resistive throughout the entire audio band, without resonance, and without inductive or capacitive contributes. This perfect impedance characteristic provides a highly stable operative platform for the power amplifier; it also facilitates much simpler and more efficient crossover network design. DM-8a has a very steep roll-off slope at the low frequency end. While input signals are lower than 200Hz it will not cause distortions nor click noise; it simply does not respond in this fashion due to its mechanical attenuation. There is a self-recovery fuse inside of each DM-8 module to provide protection in case of an abnormal DC voltage presenting or too much high current drive from the power amplifier; the AMT driver is automatically placed back in circuit after the voltage irregularity has passed.

 
            Each compact-sized DM-8a sound module measures H120mm x W100 xD 32mm. Its iron frame is rigid and heavy-duty in construction with each module weighing up to 900g (2.0 lb); the DM-8a has a rather low average efficiency around 82dB/2.83V/1m. The inner wiring of the driver is also concise, only banana post connections are required at the tweeter.

 

            Different from an assembly line produced product, the manufacturing process of the Dreams AMT module is both time and labor intensive, requiring extensive hours and hours to assemble and test. Rather than just a simple, mass-produced, assembly line manufactured tweeter, the Dreams AMT driver requires utmost dedication in both precision technology and artistic craftsmanship throughout its creation.


  

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General Specifications

Model:  DM-8a Dreams Super-Wideband AMT Driver
Frequency Response200Hz - 19KHz
DC Impedance: 4.0 Ohms (0.2 Ohms)
Average Efficiency: 82dB/2.83V/1m
Matching Power Amplifier: 60 Watts
Connection: by the Banana Posts
Overall Size: H120x W100mm x D 32mm
Net Weight: 900g (2.0 lb)


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