I doubt you can expect "clean" power, but if your goal is to satisfy a spl meter, they will work. A S/N ratio of 70db is about 10db lower than I will buy in any amplifier, personally. You seem to have the electrical to support it, which is where I suspect most people who have mechanical troubles with them fail. For $50, it is a ok deal...they are only about $120 new online. No where near the quality of the Amp you have now, but with your choice of equipment, I doubt you will be able to distinguish the sonic differences anyway.