Do I need a car audio amp?

Short answer for most aftermarket speakers to sound good is yes.



This is even more so the case for split/component speakers which use even more power because of the crossover for the tweeters.



Speakers have a power rating expressed in RMS. If you feed them this
amount of RMS power from an amp or more they will work at their best.
Ignore the other power ratings which are there for marketing.


Though your new aftermarket speakers may work just off a head unit.
Remember those high powered!!! aftermarket headunits 50Wx4 are really
only about 15Wx4 RMS. Your speakers will sound so much better with more
power that an amp can provide. If your only getting 15W from those good
aftermarket head units imagine how little the factory unit produces.



If you push the volume without a powerful enough amplifier you will damage/destroy your speakers because of "clipping".


Clipping occurs when an amplifier is asked to deliver more current
to a speaker than the amp is capable of doing. When an amplifier clips,
it literally cuts off the tops and bottoms of the musical waveforms
that it's trying to reproduce, thus the term. This introduces a huge
amount of distortion into the output signal. Clipping can be heard as a
crunching sound on musical peaks.



Speakers only output what they are fed. If you fed them wrong then you will do them harm.If you want your music to be loud, amplifiers are definitely part of
the picture. But whether you run your system wide open or softly enough
for conversation, a power amplifier will breathe life into your music,
bringing out all of its excitement and detail. Here are a couple of the
main benefits of adding an amp:


* Better sound quality — Adding an amplifier gives you a clean
power source that can drive your speakers without straining. Unlike an
amplifier built into an in-dash stereo, an external power amp isn't
limited by the space available — it can be designed without
compromises. That means your music will sound cleaner and more defined
at all volume levels.
* Power for upgraded speakers — A factory system or an in-dash
receiver may not do justice to your upgraded speakers. If you're adding
high-quality aftermarket speakers or component systems to your vehicle,
they may require more power for peak performance than your existing
in-dash receiver can provide.
* Powering a subwoofer — Subwoofers require significantly more
power than a brand-name or factory in-dash receiver can provide. A
separate amp is a necessity.

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