Increase voltage for better sound....

[Mikka]

Hello all,

I'm a beginer, so please correct me if i'm wrong.


I found out coil will be very active when the voltage is high, so maybe the sub-woofer coil also act the same way. I never try this before, so I need you guys' command.

For some weaker amplifier, the power isn't strong enough to push and pull the subwoofer, so I got this idea by using a transformer to increase the voltage. The voltage will be increase as high as posible, depend on the tranformer. The voltage will be about 200V > 400V. Will it damage the sub-woofer or the amplifier itself. Can subwoofer or tweeter handle that kind of volt

 

[Steve Eddy]

I found out coil will be very active when the voltage is high, so maybe the sub-woofer coil also act the same way. I never try this before, so I need you guys' command.

Actually, it's the current through the coil which causes the cone to move. It's current which produces the magnetic field.

For some weaker amplifier, the power isn't strong enough to push and pull the subwoofer, so I got this idea by using a transformer to increase the voltage. The voltage will be increase as high as posible, depend on the tranformer.

While a transformer can give you an increase in voltage (step-up) or an increase in current (step-down), it cannot give you both at the same time. So stepping up the voltage with a transformer will not give you an increase in current as would result if you were to just use a higher power amplifier.

That's because while transformers will step up or down voltage based on the turns ratio, it reflects impedances as the square of the turns ratio.

So if for example you have a 1:2 turns ratio, while you double the output voltage of the amplifier, the load seen by the amplifier is increased by a factor of four. So if you're talking about an 8 ohm loudspeaker, with a 1:2 transformer, it will now see that 8 ohms as 2 ohms. At the same time, the output impedance of your amplifier is increased by a factor of four.

In the end, you only break even (less than even in any realworld scenario due to losses in the transformer itself). You deliver the same power to the load as you were without the transformer.

se