Right! I could do with a little advice here! I own a Laney RB8 1x15" 300 watt combo. As I'm sure most of you know, a "300 watt" combo, actually only puts out about 200 watts into the internal speaker, and needs an additional cab to produce the full 300 watts. What I want to know is, can you fit a 4 ohm speaker of suitable rating, and get 300 watts into the internal speaker? Laney said yes as long as I didn't connect another cab. But I want to know if anyone has done in the real world! If it works, it could save me having to buy an ext. cab to get the ohmage down to the required 4 ohm to produce the full gut wrenching 300 watts (!). Not to mention the hassle of lugging a second cab around.