If a 4 ohm tweeter is rated 20 watts, what would be the wattage rating if more than one tweeter are connected in series together?
In all cases of wiring multiple speakers together the minimum amplifier power required is the sum of all the power ratings.
The RMS power rating on a speaker is the power it requires not the maximum allowable.
The impedance that is seen by the amplifier would change, but the wattage that the tweeter can handle will always be 20 watts. Wired in parallel the power handling would still be 20 watts, but the system (2 tweeters in parallel) would be able to handle 40 watts (20 watts per tweeter).
If an amplifier is rated 125 watts (8 ohms) and 2 tweeters rated 100 watts and impedance 4 ohms each are connected parallel will that suffice? And, does the capacitor affect re wattage? Thanks, as always!!
Impossible to say. It depends how efficient the tweeter is, what volume you are trying to achieve and what other drivers are in the circuit. Even a 500W amp won't fry a 20W tweeter if you are only turning the volume up to say 15W to get the desired volume. However, use a 10W amp in the same situation and the amp will start to 'clip' (squaring off the top of the wave) at its rated limit, quickly frying the tweeter coils. Because of this, it's quite normal to use an amp rated higher than that of the loudspeaker system so that you don't need to drive it too hard. The power rating of a single drive unit is only a small part of the very complicated process of designing a loudspeaker system.
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