The original unit provided knobs to control the low and high portions of the signal. The circuit itself is a state variable filter, which splits the signal into three parts (low pass, bandpass and high pass), applies a treatment to each of the frequencies, and mixes them back together. The NJM2150AD is a nearly-complete analog circuit composed of opamps, resistors and capacitors all put onto one chip, ostensibly to keep their secrets (sort of like a very expensive version of gooping)-but it certainly didn’t hurt their manufacturing costs either. The datasheet for this chip is readily available, although the chip itself can only be obtained from BBE-but the datasheet tells enough of the story that the circuit can be easily replicated with a relatively small number of components. The circuit itself is identical to the single-channel rack unit, but intended for use with guitar or bass.īoth the Sonic Stomp and the Sonic Maximizer use a specialized chip, a NJM2150AD, which was designed by BBE and manufactured by JRC/NJR. The later Sonic Stomp is a stompbox version of the rack unit that was originally released in the late 1990s or early 2000s. Many professional audio setups even outside the music industry utilize the “BBE process” to enhance sound quality. The circuit is said to create “frequency-dependent time alignment” so that the audio frequencies hit the speaker in a more optimal way. The BBE 482i Sonic Maximizer rack unit first appeared on the scene in the late 1980s and quickly achieved legendary status among sound engineers for the way it imparted clarity on the signal-often described as sounding like a blanket was lifted off the speaker cabinet. It’s based on work done by Bajaman (documented on FSB) and Sebastian Montti (stm) on DIYStompboxes in recreating the functionality of BBE’s proprietary NJM2150AD chip. The Lumin project is a workalike of the BBE® Sonic Stomp / Sonic Maximizer.
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