I'm currently looking at doing a speaker upgrade on my 13 roadglide with the stock head unit. Looking at different brands of speakers (sooo many ) and I get confused big time on all the speaker lingo. I'm wanting a good quality speaker that will plug and play with the HK head. But, I also want a speaker that will run good off that but also will have the capabilities to to pushed by a AMP later on. The 2 and 4 ohm thing seems to be the biggest thing I run into and have no idea which I need.