I have a set of digital designs components that I got late last year....although they sound great, I just got a new car and I only want to run a sub amp. So now I must ditch my beloved DD components and look for something efficient that can be run off the radio's power and still sound great. Not looking to break the bank either. Size is 6 1/2. Average to smallish sized tweeter. Please help. And if you have some and want to trade out for my DD's, let me know, and I'll post a thread in the WTT section. Thanks.