That's really interesting. I always thought that way about speakers, too. I even had the thought that maybe i should just get a 200 watt speaker so I'll make sure not to blow it. But evidently that thinking isn't right. The tech told me with a 15 watt amp I'd be much more likely to blow a 75 watt speaker than a 20 watt speaker. Honestly, I don't understand it...
The argument that a low wattage amp will blow a high wattage speaker is odd. The only thing I could think of is heat. If a speaker doesn't move enough, the voice coil could overheat. I've never encountered this, I have a 5 watt amp running into a 75watt speaker with no issues.I asked the tech and he responded promptly and said:
“All the speaker output jacks do is divert the existing speaker wiring to a tap point where you can take them out to other cabinets. There's no other circuit interaction involved and no other circuit modifications made or required to do that. The theory of the mod is that when you plug into the speaker out, the internal speaker is disconnected by a switching lug and the tip and sleeve contacts of the jack becomes your speaker lead to whatever cabinet you choose..”
He seems to be dismissing outright the possibility that there could be current going to the speaker due to the speaker out mods. Instead, he thinks cranking 15 watt amps into 65 (et65) & 75 watt (eminence 15) speakers could be my problem. The green beret is a 25 watt speaker though. Why’d it blow? He also asked if I was using fuzzes and distortions, as if that was maybe the problem. But I’ve used boosts, overdrives, distortions, and fuzz pedals with these amp for years without problems.