Don’t bother reading this review if you’re not absolutely passionate about audio, because you’ll never understand how we can heap so much praise on a set of headphones that cost $1,100. Actually, headphones isn’t accurate; the JH|13 Pros are custom-manufactured in-ear monitors. And they’re better than great sex. Well, almost.The $1,100 price tag isn’t entirely accurate, either. Since each pair is not only made to order, but to fit your ears and no one else’s, you’ll need to pay an audiologist to create custom molds of your ear canals; this will drain an additional $50 to $150 from your wallet. And you might find the fitting experience uncomfortable or even downright painful. Trust us, it’s all worth it.Jerry Harvey—the JH in JH Audio—got his start as the tour engineer for Van Halen, and that’s where he came up with the idea of headphones that fit inside your ear versus on the sides of your head, blocking ambient noise so that all you hear is what’s coming through the cables. Harvey went on to co-found Ultimate Ears, which Logitech acquired some time after he left.To be honest, we were skeptical of Harvey’s claims when he came by the office to demo the JH|13 Pros. “Each monitor has two low-frequency drivers, two mid-ranges, and two high-frequency drivers,” he said. “There’s a three-way crossover and twin bores,” he explained as he showed us his demo unit, fabricated in clear plastic so we could see the components nestled inside. “Right,” we thought to ourselves, “but the diaphragms are only so big and can move only so much air whether there are six drivers or just one.” Then Harvey fitted expanding foam tips on the demo unit and squeezed them into our ears. The demo unit delivered a surprisingly good seal, and our skepticism began to diminish after we listened to a couple of tracks. The bass response was remarkable. “Ready for a custom pair?” Harvey asked. “Oh yeah,” we said. “Sign us up.”