I have a 66 black face bassman with 2x12 cab. I am planning on using it mostly for guitar and recording of bass/ bedroom practice. I was advised by a guitar tech to change the speakers from the Jensen Bluebacks to something else due to the Jensens blowing and no replacement parts eing made for hem anymore. Another tech suggested changing for tone alone. What would be some good speakers to put in this cab for bass and guitar?