Made with a combination of leather, stainless steel, and fabric earpads, Harman Kardon's new Soho ($200) has a lot in common aesthetically with the company's 2012 headphone lineup, but is dramatically smaller than the gigantic over-ear models it takes after. The small square earpieces go on top of your ears rather than over them, and the deliberately compact, lightly padded headband holds them on pretty tightly -- arguably too tightly. Soho is shipped…