I made a spontaneous purchase of a cool looking device called Mighty Dwarf. It's a 5W speakerless portable amp. The seller reassured me that it would be compatible but I've searched high and low and can't find the technical specs for the iPad 1 headphone jack. The amp impedance is remarkably low at 2 ohms. I believe Apple's earphones are 32 ohms. Would it be safe to plug this device into the iPad? I'm worried that it might burn the audio circuit of the iPad.