I will answer ur questions
A fully functional crossover is an electronic cirucuit consistin mainly of Capcitors(Tweeters, midrange) and induction coil(Subwoofers).k ... i ll ask my audio guy abt tha capacitors ... n yeah wht do the crossover actually do ?? any particular brand of capacitors u suggest ... n wht rating ?? coz NEO suggested a 1 FARAD would do ..
There is active and passive Crossovers which is out of the topic.
These are used to differenciate the sound frequency.
Easily explained by,
a High pass filter is used to connect to ur tweeters and
low pass for ur woofers,
Midlevel or Band pass for ur midrange speakers.
Otherwise there will be too much current and low frequency enterin the Tweeters and midrane speakers which can damage them and make audio terrible.
If u look carefully on a oval 3 way speaker u mite be able to spot the capacitor on the tweeters and other midrange speakers
If ur going to waste money on a capacitor, go for atleast 1Farad!
n whts the SPL ... as u mentioned "the SPL of ur sub can be increased wit a monoBlock AMP and capacitor. "
SPL : sound pressure level, i will try explainin it wit an example.
Lets say there is a pond wit water filled
Size of the pond is equal to the watts of the sub.
Bigger pond means bigger watts.
Consider u throw a stone into the middle of the pond which will create ripples moving outward.
Size of the stone is equal to the watts of the amp.
Bigger stone means powerful amp which means better ripple.
IF u throw a small pebble, the ripple wont even reach the end and it will die off. IF u throw a moderate stone, it will reach the end, bigger stone will yeild better results. However, consider there is meteore which falls into the pond, the whole water will get splashed out.
Now tats it... Meteore can be compared to an amp having more RMS watts than the SUB.
Here the ripple is the SPL, i hope u guessed that.
SPL is the bass that u will feel, the effect that u get by having powerful amp.
Dont worry ur subs arent underpowered.