Hello Talkbass. I haven't been on this forum for years, had to re-register to post as I know the users here can give me the advise I need. I'm having a big problem, I dont know what's going on. I need help. Short version. I'm getting a nasty sound at very high volume mostly on low notes. More details. I have a solid state, strong 250 watt 4 ohm head. 80's model Trace Elliot AH250. I own a David Eden D210 xlt 8 ohm (with horn) and a D115xl also 8 ohm (no horn). I have used both cabs sperately and daisy chained together without issues plenty in the past. Recently I'm playing with a dear friend who unfortunately insists on playing as loud as humanly possible. Great guy, love the music, known him for years - no way to get him to turn down. I just use ear protection and don't bother trying. I've been using just the 210. EQ pretty flat. Very mid range focused sound. This entire post is in regards to the 210. Haven't tried the 115 yet. The problem seems to have appeared as our volume levels have gotten even louder. At first I thought it sounded like clipping, maybe a problem with the basses pre amp, but nothing should have been clipping. I put away my old active p bass lyte because it seemed worse if I used any low or mid eq on the bass. The next week I brought my old passive hwy 1 p bass upgraded with bass lines pickups. Volume was probably even louder this week. The amps volume is still not at max, but far higher than I've ever had it. Sounds like blown speakers at high volume and the sound just can't get any louder. Speaker cones look like they're bouncing off the grills they're moving so much. I turned down a bit to make it a bit better, but still had to be heard over the insanely loud Marshal, so I just played it because I didn't know what else to do. Is this the cab "farting out"? I've never been sure what was meant by that. If I turned down it was cleaner. Unfortunately I couldn't turn down enough to be truly clean. Have I damage to the cab playing it this way? I can't really test at home as I live in an apartment and the problem appears at insane volumes. For now I'm planning to bring both cabs next time and praying that I haven't seriously damaged the top cab. Will the second cab help? Do you think I've done damage? I'm really worried because of unfortunate life circumstances, i can't even afford to replace drivers in the Eden cab right now. Will adding the 115 help me get clean and loud? Is it maybe something else at play here? It's worse on low notes, happens at high volume. Sorry for the long post. Wanted to be thorough and I'm really worried. Any help is greatly appreciated. Thank you.