Mission M31i M31ICR Manuale Utente

High grade OFC (Oxygen free copper)

Copper  is  an  excellent  electrical  conductor;  however,  oxygen  im-

purities within the crystalline structure can adversely affect that 

conductivity. By refi ning the copper to a much higher grade of 

purity, electrical conductivity can be improved and hence signal 

quality.

Ferrofl uid cooling

Treble voice-coils are fi ne wires and tend to get very hot 

when used for a long time, or at high volumes. This can cause 

distortion and compression if the excess heat cannot 

be removed. Ferrofl uids are used in treble drive units to sink

 heat between the voice-coil and the magnet assembly. They 

also passively damp the movement of the cone. They reside in 

what would normally be the air gap around the voice-coil, held in 

place by the speaker’s magnet.

Neodymium

Neodymium magnets (NdFeB) are one of a class known as 

‘rare earth’ magnets. They are also sometimes known as ‘super 

magnets’ because of their unbelievable strength and small size.

They are ideally suited to audiophile loudspeaker applications 

because of their strength, low weight, small size and their thermal 

stability.

Die-cast Chassis

Die-cast chassis are a huge improvement over plastic or even 

pressed steel units. Because of the manufacturing technique 

used, they can have a more complex three dimensional shape  

hence are much stronger.  Because of their higher strength, they 

can be manufactured with an open frame design. This allows 

air  moving  backward  from  the  cone  to  flow  and  be  absorbed 

within the cabinet rather than being reflected back through 

the cone. There is an obvious improvement to mid-range clarity 

and timing. 

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