Headphone Reviews

The top-of-the-line model from America's leading headphone manufacturer, these are bulky, heavy, very business-like in appearance, and very, very good.

The ESP-9 is dual-powered: from the AC line, or from the input signal itself, The power supply is rather large and heavy, and appropriate in appearance to the phones. Amplifier connections are via wires with spade lugs attached, and speaker connections are made to the rear of the power supply. A front-panel switch selects speaker or headphone operation, and terminates the amplifier outputs with 10 ohms in the Phones position.

Construction is typically top-of-the-line Koss: Rugged, nicely finished, and apparently very durable, and the phones are easy to handle. (Many headphones are so loosely pivoted on their headbands that they swing into impossible positions whenever you pick them up.)

Almost a dead-ringer for the early-model Sharpe HA-10, Koss's PRO-4 ($45) is readily distinguishable by a large knurled protuberance sticking out of the lower part of the right-hand phone. This, in case you've wondered, is a mounting for a "boom-type" lip microphone, for use in speech labs and for communication purposes. (Sharpe and Permoflux also provide facilities for attaching a lip-mike.)

Over the years, I've listened to many headphones, beginning with the Grado SR60s I bought with my first paycheck. Since then, I've been lucky enough to sample many exotic cans, but I always return to the admittedly controversial realization that I happen to prefer ... earphones.

The first headphones I owned, circa mid-1970s, were made by Pioneer. They jutted out from my ears, with small, paper-cone speakers inside. "Head-Fi" is a whole different world nowadays than it was back then. The biggest change is Bluetooth, which lets us untether ourselves from our stereo systems.