Pop noise after replacing stock system

I have a 2000 Mustang GT and replaced the head unit with a pioneer.  It sounds great, but when you turn it on I get a pop noise in the front speakers.  They say it is normal.  Can anything be done to resolve this? 

Thanks

my cutlass popped when its on after replacing with a pioneer head unit. try unplugging yur antenna, even when playing cds, i got popping in my music with the antenna plugged in. Ive yet to fix the problem so i couldnt tell u how, i just leave my antenna unplugged because i dont use my radio anyways

Sounds like a turn on pop with the factory amplifiers.  Try this and see if it helps:

http://www.crutchfield.com/S-6e4lAFaoPXq/tech/kb327.html

As long as the amps use a 12v turn-on (I believe they do) this should do the trick.  All you're doing is building a delay circuit with a capacitor, and a diode.  Rather than using the headunit's remote turn-on lead, use the switched accessory wire.  Run a line from this lead, and put a diode in series with the cathode towards the amps.  Somewhere after the diode, wire an electrolytic capacitor in parallel with the amp turn-on lead.  Varying the capacitor's value will vary the turn on delay, I usually go with a 470 or 1000 uf capacitor.  Try this out and let us know if it works or not.

Superchuckles gave me the idea for this a while back when I was having a pop problem.  A quick search on google turned up the Crutchfield article.  I hope this helps.