Go to Walmart get a cheap DMM($12-17) in which can be used for several electrical projects,so its not a waste of your $,and take it up to an Orileys/Autozone and get them to set it for you on Ohms readigs, if you cant figure it out,and or watch a crash course on You Tube.There is a reason for people putting things on Craigs List at Times.Trust yourself, and your Knowledge, not someone whom may take advantage of you..You walk up with tham DMM, and m sure he will state a different issue with the subs??Or he may not?Ohh I didnt know I had a blown sub..it sounded fine hooked up..Ya Im sure it did..at one time..if it sounded so good why sell them?Be my question.Be smart man..dont get taken..You may find that they are in Great shape also, and get a great deal, but utilize your resourses, rather than get taken, and be certain.Got an Electrician Friend? Call and ask him..call Home Depot??They sell em too/Lowes/Sears ect