Hello. I've never had nice headphones before, and have never used any equipment that requires an amp. I kinda bought these on a whim without doing much research because I thought I could just plug them in my phone and be good. I'm trying to use the HD-600's with my computer and my iPhone 6s. What portable amp with just the basics would be the best bang for my buck? I'd like to stay under $200. I've tried to do research but a lot of it is greek to me. I don't really know the technical aspects that are talked about in reviews and posts on this forum, and I'm not sure what will work specifically with the HD-600's. I think I will just have to rely on simple advice about what's "best". I'm also confused about the sound card on my computer and whether it needs an amp. I am using a Gigabyte GA-Z170X-Gaming 7 ATX LGA1151 Motherboard. The manual doesn't explain it well but there are two "power" settings on the soundcard - 2.5X and 6X. I have no idea what the ohms output is on these settings. All I know is the sound on my computer is very loud. I have to turn my volume down to about 10% or else it is too loud for both my current headphones and speakers, and I think this is on the 2.5X setting. Is there any way I could measure the output? Any other advice would be appreciated.