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Hmm speakers.
All car speakers are made from little coils of wire between magnets that are attached to a cardboard (or similar material) cone. As the current varies through the coils, the cone vibrates and you hear the sound. End of story. Some car speakers are 8 ohms and most are 4. Every amp that claims 50W uses 4 ohm speakers. Matching between amp and speaker !!!!! The amp has no idea what is attached to it.
The quality of the fabrication does vary. You may be able to do and A B test between 2 sets of speakers and one will sound better than the other. HOWEVER, listen to both sets and then wait 10 minutes. Get some one to randomly connect a set and then you listen and see if you can identify which one it is. Better still, get in the car and drive at 60mph and then guess. Basically it will be a guess because you will not know the difference.
On the other hand if you are listening to that level of intensity, you cannot be concentrating on driving.
After a love affair with hi fi for 40 years, just use a reasonable quality speaker and it will be excellent. (Bigger diameter, better base and higher volume in general)
The only way that sound makers make money is by is making you believe there is a difference. There is very little in it in a car environment.
Save your money.
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