Seadee456

has anyone ever replaced the nakamichi stereo out of the ls? all I get on the searches is about the gs and nothing on the ls. my passenger side speakers died about a week ago and then yesterday the rear driver's side died as well. I'm thinking that the headunit died, however i cant be sure. is there any way to test this? if this is the case im just going to replace it with a nice aftermarket unit. if i go this route, will i be able to retain the factory speakers? are they amplified at the speaker and will i have to replace them with the headunit? thanks for any help, really appreciate it cause this thing is driving me nuts.