Featuring a proprietary, hand-tuned capsule, the Blue Baby Bottle SL is a studio condenser microphone which builds upon its predecessor to offer a switchable 100 Hz high-pass filter and a -20 dB pad to ensure a pristine captured sound, regardless of the source. It utilizes a large, gold-sputtered Mylar diaphragm, replete with a machined brass backplate to shape its frequency response; this creates the warmth and presence characteristic of Baby-Bottle-series microphones.

The Baby Bottle SL offers a cardioid polar pattern, giving you a frequency range between 20 Hz to 20 kHz—more than enough to record vocals, pianos, stringed instruments, and more. This frequency response has been tailored to offer a present midrange, a smooth top end, and a low end which will not overpower the recording. Furthermore, an SPL of 134 dB allows the microphone to capture a wide swath of dynamic material without damaging elements of the microphone. The microphone requires 48V phantom power to run, provides a dynamic range of 123.2 dB, and includes both a custom shockmount and a wooden storage box.