I watched someones tank a while ago and he had 4 MP40's running, all fairly new. I have to say I found them noisy and pretty irritating because they were pulsing so it was constant winding up and down noise, would have been bearable if it was just set to constant flow but that would defeat the purpose. But it does depend on the person, when I asked the owner if he found it irritating he acted like he couldn't hear anything, but he must have been deaf IMO. I've used Tunzes mostly myself, you can barely hear them even close up with the same pulse effect.
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