Well, it's a multi-part problem.
Underpowering speakers does a few things, but in and of itself isn't bad. It's these other things that become bad.
Simply, the speaker can't be controlled by the weak power source. Think of trying to drive a dump truck with a dirt-bike engine. You might actually get it to move, but not very well. At low volumes, this is fine and the speaker will do well. But when you start to try to push your volumes, the speaker's power-hungry nature will cause the power source to lose accurate control of the speaker. This can result in things like early distortion, added noise, all the way up to clipping and coil distortion that can actually damage the speaker.
The inverse (putting way too much power behind a speaker) is like putting a top fuel dragster engine in an otherwise stock sedan. First time on the gas hard, you explode parts left and right.
The perfect balance is giving the speaker the power it wants to properly operate without cooking it.Target is say 80-110% it's rated RMS potential. So with that speaker being rated 60W RMS and most of the stock TJ units I tested only having about 7W of output, you can see you're grossly underpowered. This is fine if you don't crank it. But if you try to boost it (even loud enough for topless on the highway may be too much), you'll eventually run into problems. Plus it will just generally sound bad at volume since you don't have the power to actually move the speaker.
Sir G. Cal - 2k Sahara TJ
Living and loving on borrowed time. Life with Multiple Sclerosis.
My MS/Life blog, Audio and Electronic write-ups, project how-tos, pictures, stories, and more.
Originally Posted by SirGCal
If you can't take a nano-second to press shift/period/etc. and make proper sentences and paragraphs, I don't know if I can take a few minutes to respond to your topics... It doesn't have to be perfect by any means, but a little effort goes a long way.