Well if higher the number of RMS better the power THEN how will it be useful for the amp?Does more power means I have a better amp?Does it make any difference in the end output?
Also when i need to match speakers with the amp I have I am told that the RMS of speakers which I chose should always be more than what I have in the AMP.Is this correct?
Can you please explain what is S/N ratio?
OK.
Power is related with current that amp outputs to spk.Power=current*voltage
When you choose smaller spk ,you need less power.ie-when listening to ipod,
walkman you need very little power.If you check speci.of those,you will see
power in miliwatt.Still you can get very loud sound from device.
If you check car decks ,power required is hardly 50w.
For home use you need 70 to 100w(depending on area)
In open ground you need 1000w.
Other aspects r sensitivity(as said earlier)& impidence of spk.
Impidence is like resistance(spk coil)If imp is less (6 ohm)naturally more current will flow through spk,so more power is rquired.
So to drive 6oh spk, you need more power than 8 oh spk.
In other words check the spk impidence before you you decide amp power.
S/N ratio is signal to noice ratio-if signal unit is 100 & noice(distortion)is1
(signal/noice) then ratio will be 100(100/1)
So as we need less noice in sound S/N ratio has to be more.
Lastly as per electomagnetic theory,when amp send signal(sound) to spk,
another opposite signal is sent by spk to amp.
So amp has to cancle that signal & send newone to get mooth sound.
So if you select amp with slightly more power than spk ,its better.