Audio-Technica AT4051B
The AT4051b is a modular small-diaphragm cardioid condenser built for professional recording and critical broadcast work. It pairs the AT4900b-48 body with an interchangeable cardioid head capsule, and direct-coupled balanced output gives it precise, transparent sound.
Small-diaphragm cardioids excel on overheads, acoustic instruments, and anywhere accurate transient response is essential. It handles up to 146 dB SPL, with a 10 dB pad extending that to 155 dB. Because the body accepts omnidirectional and hypercardioid capsules as well, one investment can grow into a three-pattern set. It runs on 48V phantom power over a 3-pin XLR output.
| Element | Fixed-charge condenser, modular (small diaphragm) |
|---|---|
| Polar Pattern | Cardioid |
| Frequency Response | 20–20,000 Hz |
| Impedance | 50 Ω |
| Max SPL | 146 dB SPL (155 dB with 10 dB pad) |
| Phantom Power | 48V DC |
| System | AT4900b-48 body + AT4051b-EL capsule |












