JAMO C 80 SUR Брошюра - Страница 6

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reproduction of surround effects but also provides a remarkably deep and steady

bass. In other words, Jamo XBR combines the best of these two principles.

Because XBR carries out the electrical phase shift on one of the woofers, the

C 80 SUR are individually conﬁ gured as a left and a right loudspeaker. In this way

the perfect interaction with the front speakers is achieved i.e. there's a perfect tran-

sition between front and surround speakers when sound effects pan back and

forth across the room.

C 80 SUB

The C 80 motional feedback-controlled active subwoofer is equipped with two

very powerful 10in aluminium cone woofers in a closed cabinet.

The advantage of using two 10in woofers instead of one large one are two-fold.

One is higher power handling capability - as the heat is better disposed of in two

voice coils/magnet systems – and the other a faster attack - as a smaller woofer has

less moving mass and thus is better controlled. Finally the more compact resulting

design makes it a lot easier to ﬁ nd a suitable area to place the subwoofer. The cone

area of the two 10in woofers equals the size of one 13in woofer.

The sub's BASH® technology-based ampliﬁ er delivers no less than 1800W – more

than enough to secure sufﬁ cient headroom, even for a subwoofer reaching down

to 20Hz (- 6dB).

Ampliﬁ er

The important thing with subwoofer ampliﬁ ers is the ability to deliver high power,

something that's especially important for the reproduction of peak bursts (e.g. an

explosion or a bass drum) with full ﬁ delity. This has to be done with a minimum of

distortion and while maintaining very tight control over the woofer.

Due to the nature of a conventional class AB ampliﬁ er it needs to have a substantial

supply since only approx 60% of the power is turned into sound – the rest is turned

into heat. Consequently the heat sink of a conventional ampliﬁ er also has to be

enormous in order to cool it properly.

On the other hand a class AB ampliﬁ er also has some excellent advantages, such as

musicality, low distortion and a high damping factor.

So, wouldn't it be nice if we could combine these qualities with the efﬁ ciency of a

Class D ampliﬁ er?

That's why the development team decided to turn to a specialized technology that

met those needs – one that delivered high power output with high efﬁ ciency while

maintaining musicality, low distortion and tight control over the woofer. A patent-

ed technology called BASH®.

The key operating principle of BASH technology is based on a continually variable