I would like them to be as loud as the idog
Check the wattage. If your cranking more watts through it than it can handle, it will destroy them.
After this, if power amplifier instructables were horses, we would be hip-deep in crap. look for them on the site, replace the outputs with 1/8 TRS (your typical Headphone plug-in,) and tweak the wattage to meet the maximum power wattage of the headphones.
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Plug them into a suitable amplifier.