JAMO C 807 Брошура - Сторінка 8

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frequency and so is the negative feedback. Consequently, the woofer receives less

power in this area and, when combined with equalization the frequency response

reaches down to an impressive 20Hz (-6dB).

It is possible to make a subwoofer this size reach 20Hz just with pre-ﬁ ltering/

equalizing, but that would create severe timing problems. In practice, this would

be heard as the subwoofer constantly "rumbling" – i.e. not able to start and stop

correctly. This might sound quite impressive initially, especially when listening to

soundtracks with a lot of explosions etc. Ultimately, however, it is also the reason

why many audiophiles prefer to turn off the subwoofer when listening to music - it

simply sounds annoying no matter how low you adjust the subwoofer level.

Combining a powerful ampliﬁ er with MFB makes for a bass reproduction that's

deep, precise and detailed.

Variable Boundary Gain Compensation.

Reaching down to 20Hz grants reproduction of the extreme bass content of e.g.

movie soundtracks with full authority.

However, in certain environments this can create a problem, which is why some A/V

receivers/decoders feature a Boundary Gain Compensation ﬁ lter.

This ﬁ lter compensates for the room inﬂ uence at low frequencies, as any room am-

pliﬁ es the lowest frequencies.

The magnitude of the room's ampliﬁ cation depends on the actual room and where

you are positioned – normally it increases the closer you get to a wall, which also

means that the problem gets worse the smaller the room.

This can result in too high a bass level from approx. 60Hz and increasing down-

wards. In the range between 20-30Hz it can easily cause peaks of up to 10dB!

On ﬁ rst impression this could sound really impressive but the sound will rapidly

seem rather boomy, especially when listening to music, and ultimately it'll just

sound very annoying.

To compensate for that, the C 80 SUB has a quite unique feature:

Variable Boundary Gain Compensation is built into the C 80 SUB to compensate for

a room's inﬂ uence at low frequencies.

If you only employ the usual adjustment options, such as cut-off frequency

and volume level, it will be impossible to obtain a linear in-room frequency re-

sponse. Variable Boundary Gain Compensation, however, allows an extra de-

gree of ﬁ ne tuning which will compensate non-optimal location of the listen-

ing position and any "difﬁ cult" acoustic properties encountered in a room.

All the controls (level, phase, cut off frequency, boundary gain and auto/on/off ) are

placed on the front of the C 80 SUB, elegantly integrated into the design so that