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Electronics 

The important things on subwoofer amplifiers are the ability to deliver high 
power – especially peak burst are important to reproduce e.g. an explosion or a 
bass drum with full fidelity. This has to be done with a minimum of distortion 
and a very tight control of the woofer.

 

Due to the nature of a normal class AB amplifier we would need to have a very 
big power supply since only approx 60% of the power is turned into sound – 
the rest is turned into heat. Consequently the heatsinks of these amplifiers 
would also have to be enormous in order to cool the amplifiers sufficiently. 
On the other hand a class AB amplifier has some excellent qualities – such as 
musicality, low distortion and high damping factor. 
So, if we could combine these qualities with the efficiency of a Class D amplifier 
it would be ideal . . . 
 
Consequently, the development team turned to a specialized technology that 
matched our demands perfectly: High power output with high efficiency while 
maintaining musicality, low distortion and tight control of the woofer. A 
patented technology called BASH®.  
 
The key idea of the BASH technology is based on a continually variable supply 
voltage which tends to zero when there is no input signal and reaches its 
highest level when the amplification requires power. This supply voltage is 
continuously variable but always lower than that of an AB class amplifier and 
thus a much higher efficiency is achieved.  
 
The outstanding energy efficiency (85%) achieved by this technology, allows 
very high output power, without heating up the amplifier and thus elimination 
of the need for excessive heat sinks. 
 
The power supply itself uses a high speed D class unit in order to constantly 
supply the amplifier with the appropriate power.  
 
Due to its voltage switching capability a BASH amplifier plays louder than a 
conventional amplifier of comparable RMS power. Simply by not being a 
voltage limited amplifier it has tremendous dynamic power capability. 
 

Controls & Features 

All the subwoofers features volume-, variable phase- and variable cut off 
frequency controls to make sure that the sound from the subwoofers can be 
adjusted to blend in seamlessly with the sound from the rest of the speakers. 
SUB 650 also features a 12V trigger input, so it can be turned on and off from a 
A/V receiver/controller that has a 12V output, ensuring that the subwoofer 
always will be active when the A/V receiver/controller is turned on. 

 

Содержание 250

Страница 1: ...Technical Description Jamo SUB 250 300 550 650...

Страница 2: ...evels SPL without compromising the sound quality It is quite easy to make a subwoofer play loud but it is a challenge at the same time to maintain precision and musicality This turned out to require d...

Страница 3: ...ted construction is used here as in the SUB 250 But with more cabinet volume allowing for deeper tuning more power and a 10 driver this subwoofer is capable of reaching down to 28 Hz 6dB Still with mu...

Страница 4: ...is no bass reflex port to contribute to a high SPL it delivers 110 dB sound pressure level The advantages of a closed cabinet is absolutely absence of port noise and an even better timing resulting in...

Страница 5: ...is based on a continually variable supply voltage which tends to zero when there is no input signal and reaches its highest level when the amplification requires power This supply voltage is continuou...

Страница 6: ...ification 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 i...

Страница 7: ...ne is moving Sub 450 550 For the SUB 450 550 a 10 driver is chosen The driver features an 38mm 4 layer voice coil with an X max at 15mm allowing for high excursions The heavy magnet system features a...

Страница 8: ...In normal setup the port is radiating towards the rear wall giving an even higher efficiency at very low frequencies...

Страница 9: ...250 300 550 650 Frequency range Hz 30 150 3dB 28 150 3dB 26 150 3dB 24 150 3dB Impedance Ohm 22 kOhm 22 kOhm 22 kOhm 22 kOhm 12 V trigger No no no yes Phase Yes variable Yes variable Yes variable Yes...

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