JAMO D 7PEX Opuscolo - Pagina 10

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The MFB circuit is comparing the diaphragms movements

with the input signal.

The transducer at the back of the diaphragm monitors the

movement of the diaphragm by measuring the acceleration

of it. In the feedback circuitry the signal is converted to a

signal proportional to the speed. The speed is highest at the

resonance frequency and so is the negative feedback.

Consequently, the woofer receives less power in this area,

and combined with equalization the frequency response

reaches 20 Hz (-6dB).

It would be possible to make a subwoofer this size reach 20 Hz just with pre-

filtering/equalizing, but that would create severe timing problems. This would be heard as

the subwoofer "rumbling" all the time – i.e. not able to start and stop correctly. This might

sound quite "impressive" when listening to surround with a lot of explosions etc., but it is

also the reason why many consumers prefer to turn off the subwoofer when listening to

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

The very powerful amplifier combined with the MFB makes the bass reproduction

deep,

precise and detailed.

Auto On/Off

Forget all about the subwoofer once it is connected as this feature automatically sets the

subwoofer in stand-by after approximately 20 minutes without input signal.

The "start up" sensitivity is 3mV and it stays on as long as the signal is above 1mV.

Phase and Cut-off controls

Place the subwoofer where it is most convenient - the controls ensure that the sound from

the subwoofer can be adjusted to blend seamlessly with the sound from the rest of the

speakers.

Cabinets

Due to their compact size and the fact that the cabinets are made of MDF board, they are a

heavy and resonance dead base for the drivers to work in.

The MDF board used for the D 7LCR front baffle is 22 mm , the rear baffle is 25 mm, and

the bottom/sides are 19 mm thick.

D 7SUR has two arrays for the midrange/tweeter and the wood part of the cabinet is made

of 16 mm MDF board.

The cabinet for the D 7SUB is made of 25 mm MDF board which makes it very rigid and

resonance dead, contributing to the precise reproduction of the low register.

The finish of the system is Stone Grey with black fabric front.