Headphone Buying Guide

Headphones come in all shapes and sizes, spanning the gamut from small and sporty to large and professional. Junking the set supplied with your MP3 player is also the easiest way to improve its sound quality. We step you through the ins and outs, as well as the technical mumbo jumbo.

1. Choose a form factor
2. Six key headphone features
3. More features and terminology
4. Specs that (mostly don't) matter
5. Headphone connection types
6. Accessories and adapters

Specs that (mostly don't) matter
You find a few of the following specifications on the headphones' box or on the manufacturer's Web site. Here's what they mean and why you can usually ignore them.

Frequency response
Frequency response specifications in full-size loudspeakers are generally pretty useless in predicting sound quality, but headphone frequency response numbers are even worse. Manufacturers have routinely exaggerated frequency response figures to the point that they're irrelevant. Even the flimsiest, cheap headphones routinely boast extremely low bass response performance -- 15Hz or 20Hz -- but almost always sound lightweight and bright. Generally, bass buffs will be happier sticking with larger headphones.

Total harmonic distortion
True, headphones with lower actual total harmonic distortion (THD) will sound better than those with higher THD. But the quoted THD numbers, like "less than 1 percent", aren't helpful in predicting sound quality. Listen to recordings of simply recorded acoustic guitar to assess the distortion of one set of headphones versus another. Some will sound appreciably cleaner than others.

Impedance
Generally speaking, the lower the headphones' electrical impedance (a.k.a. resistance), the easier it is to get higher volume. But here again, the low impedance is no guarantee of high volume capability; other factors can still limit loudness potential. Since many MP3 players have feeble power output, smart shoppers should check the loudness before purchasing any pair of headphones. To be sure, listen with your player.

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