I currently own a vibrochamp and 2 champs. I replaced the vibrochamp and one of the champs with jensen c8r speakers. (I wanted to preserve the original speakers). My last acquisition, last week, came with a destroyed speaker so I put one of the originals from the other 2 in it and I can't believe how much better it sounds than the other 2!! One of the originals has a flat round magnet which I am assuming is ceramic and the other has the smaller, almost cylindrical magnet with a u shaped bracket behind it. Is this one an alnico magnet and if so is this the reason my latest sounds so much more tonefull?