contact ener , he may have some amplfier to run your 308d2 , which is just a baby driver 400wrms only , ask ener if he have some 2nd stuff sound stream
Gold Ice , try that amplfier , which can handle upto 2 subs easilywhich rms @ 4 ohms 300~500Wrms , and @ 2 ohms 700~900Wrms
putting a special amplfeir for only single 308d2 ,may be waste of money
