You don't need a capacitor to connect two speakers in parallel, please explain EXACTLY what you're wanting to do.How to connect two speakers in parallel
using a capacitor without reducing the sound and which capacitor should be connected to different capacity of speaker.
In a low impedance audio system you would ordinarily specify a combination of speakers based within the limits of the power of the amplifier and if using 2 speakers in parallel on say a 4Ohm amp you would use 8Ohm speakers bringing the line impedance down to 4Ohm and you would have the maximum power possibly available. For more speakers a serial/parallel arrangement would be required to achieve the desired line impedance. You can check this with either a moving coil impedance meter or a digital Watt meter.Two same speakers in parallel draw double the current of one speaker and might blow up the amplifier.