Dimming Head Unit

So i have a 92 honda prelude with a pioneer deh-p4000 installed.  It is just running 4- 6 1/2" speakers (alpines.)  When i turn it up to the volume i like the cd player's screen dimms when the bass hits.  is this a problem?  I dont really care abou tthe dimming, i was just htinking maybe my speakers wouldsound better if that wasnt happening.  Sorry if this is should have been in car audio forum but its not really an audio q so i thought i would put it here.  Thanks in advance.Vive el Che

A futher note to add; The dimming is not a problem it just mean the headunit is working harder than it should. As boxmaker85 suggested, a small external amp is not a bad idea. You will get better sound and at the same time extend the life of your speakers and headunit.   Be careful whose advice you buy, but be patient with those who supply it.

Do the headlights dim at the same time? If they do, this is not a head unit problem or an external amplifier upgrade problem, but one of the availability of current. Meaning current draw from stereo > current capacity of battery and alternator. If more current is needed by the audio system, the first place that you will notice it is in the lighting circuits of a vehicle, be it the dash, the headlights or the cd player. Post up your findings.Top Secret, I can tell you but then my wife will kill me.

This problem is pretty common to most newer high output decks. You mau be able to help the problem by running a thicker battery power wire from the head unit to a good battery source of power in the car. (Yellow wire on Pioneer radios). A good source of battery power can b e found at the fuse box or ignition switch harness. Install 12 gauge wire and fuse it close to the vehicle's power source for safety. Also ground the Pioneer to a clean, paint free spot of the car's chassis as close to the radio as permissable. As mentioned, the dimming is normal under high loads and won't damage the radio. Overdriving the radio's amp can cause it to clip or distort. This can kill speakers, even if they are rated for more power than the head unit can put out. As recomended, consider upgrading to an amp to drive your speakers if you like it loud.sparky

No my headlights nor anyother lights seem to dim at the same time.  My headlights do dim however when i start my car.  I once heard that's a sign of a bad alternator.  Anyway thanks guys for all the posts.  Could you suggest a good amp for my needs or maybe just specs?  Keep in mind that i have no clue about amps.  thanks again.Vive el Che

Sparkie nailed what I was going to suggest next, follow his advice first before you head off on an amplifier search.Top Secret, I can tell you but then my wife will kill me.