Can someone recommend a decent amp? I had the 4XX and loved it but lost it. I had a cheap portable amp that helped the volume with my iPhone. I’d use them mostly at my while working from my laptop where I could either listen on it (cheap chromebook) or iPhone. Don’t know what a DAC does and it’s a bit more technical than I care to know about. I’d spend up to $300, doesn’t have to be portible, doesn’t have to be that expensive. Just a simple “get (fill in the blank)”. Thanks so much!!