Buy a 10 watt rated single Mundorf 2 ohm resistor and add it to the speaker by just adding it to one side of the speaker connection. And see if that works. If the speaker with them on is still loud enough, and stops the amp from failing. Solved. Mundorf resistors are from Germany, and if you are in EU, easy to buy online. If you are far away from anyplace, search around for a company which can sip them to you.
Then it was just the speaker impedance was too low for your amplifier. Adding the resistor solved it. You could then adjust the value of the resistor for best performance. But I would not go below 1 ohm added. nor more than 5 ohms.
Important to feel the resistor for HEAT. IS it getting hot when in use if so, you either need a heat sink for it, or a higher wattage resistor. (you could buy two 10 watt resistors with twice the ohm, and run them parallel So if you want 2 ohms, use two 4 ohms ten watt and use them in parallel )... If it is not getting hot, then it is OK as is.
This is an easy to do thing. And it could solve the issue. The 10 watt Mundorf resistors are cheap, and sound pretty good. If it were me, I would order a 2 ohm ten watt, and two 4 ohm ten watt right off to experiment. If the money $1,89 or so each US dollars. is not problem, you could buy a few values.. like a 1 ohm,a 2 ohm, two 3 ohm, two 4 ohm two 5 ohm... Then you would have a variety of values to experiment with to get BOTH the sound level high enough and the amp to stay working.
If it does not help. Then you are out at most $20 US dollars or so.
Then it was just the speaker impedance was too low for your amplifier. Adding the resistor solved it. You could then adjust the value of the resistor for best performance. But I would not go below 1 ohm added. nor more than 5 ohms.
Important to feel the resistor for HEAT. IS it getting hot when in use if so, you either need a heat sink for it, or a higher wattage resistor. (you could buy two 10 watt resistors with twice the ohm, and run them parallel So if you want 2 ohms, use two 4 ohms ten watt and use them in parallel )... If it is not getting hot, then it is OK as is.
This is an easy to do thing. And it could solve the issue. The 10 watt Mundorf resistors are cheap, and sound pretty good. If it were me, I would order a 2 ohm ten watt, and two 4 ohm ten watt right off to experiment. If the money $1,89 or so each US dollars. is not problem, you could buy a few values.. like a 1 ohm,a 2 ohm, two 3 ohm, two 4 ohm two 5 ohm... Then you would have a variety of values to experiment with to get BOTH the sound level high enough and the amp to stay working.
If it does not help. Then you are out at most $20 US dollars or so.