Allo all, I have a Hartke 4x10 4200 Pro cabinet that has one blown, and 3 working drivers. It's my slave cabinet at our jam space. Still sounds good enough with 3 good and 1 buzzing speaker but would like to fix it on the cheap if I can. I don't really care about matching "cabinet acoustics" or other specifics like that. Just one that will fit in and work well enough without buzzing or breaking too easily. Don't care if it doesn't have aluminum cones. I bought the whole cabinet for $100, I'm not putting another $100 into it for the best speaker money can buy. My questions are: The speaker should be 8ohm, yes? The whole cabinet is 4 ohms. The only specific detail I can think of that might matter SPL capability of the speaker. Is it *THAT* important or should I really not care"? I'm assuming I need a 100 watt RMS speaker, as the whole cab is rated at 400 watts at 4 ohms. (100 per speaker). I'm not rewiring anything in the cab, I just want to plug and play. I'm currently considering this: Amazon.com: MCM AUDIO SELECT 55-2972 WOOFER POLY CONE 10 INCH MCM 100W RMS 8OHM RUBBER SURROUND: Home Audio & Theater Gets good reviews.