Cutting highs and lows on either side of the cutoff frequency setting is what BPFs do. Blue Microphones Baby Bottle Large-Diaphragm Condenser MicrophoneThe Baby Bottle is a cardioid polar pattern microphone, giving you a frequency range between 20 Hz to 20 kHz—more than enough to record vocals, pianos, stringed instruments, and more. Like the other newly launched SL versions, the Baby Bottle is a condenser mic with a cardioid pattern. This frequency response … Blue’s flagship tube mic, the Bottle, quickly became one of the standout recording mics in the industry, and with the Baby Bottle SL, that big, warm sound is still there. Although it may look very similar to their existing Baby Bottle, this new mic from BLUE turns out to be a different beast entirely. Figure 7: Frequency analyzer showing the response curve of a bandpass filter, where the lows and highs are cut on either side of a hill-shaped 'pass band' of frequencies. It gives the recordist a basis of the sound provided. Bottle B6 Capsule Frequency Response Frequency (Hz) This frequency chart of the Bottle B6 capsule is only a start. ... but the rather stylised frequency-response chart provided in the handbook reveals a reasonably flat overall response with an airy peak centred at about 12kHz and a small presence lift at about 2.5kHz. Just in a smaller form factor. How the microphone reacts in a particular application will differ greatly because of many variables. And for less than 1/10th the cost.