The IN-9 Nixielyzer is an analog audio spectrum analyzer, based around the BA3830F analog analyzer chip. It offers the display of six selective audio bands: 63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz and 10 kHz.

As an extra feature, you can mix the signal of a build in microphone to the display, to use the IN-9 Nixielyzer as a stand-alone device when no audio source is connected).

The IN-9 Nixielyzer operates with six IN-9 Nixie Bargraph tubess and has two RCA stereo in- and outputs (for easy daisy chaining the device within an existing audio path) and also two 1/8" TRS jacks for simple connecting your MP3 player, mobile phone plus headphone for listening etc.

Both signals (RCA and 1/8" TRS are only internal mixed via an electronic zero ohms node and do not affect each other.

The IN-9 Nixielyzer uses no digital signal processor or FFT (Fast Fourier Transformation); so the display is stepless and fully in realtime.
Furthermore a modified dbx compandor ciruity was introduced to enhance the dislayed dynamic range.
The topology of the electronics corresponds to that of the proven EM800 Magilyzer circuity.

You surely know a VU meter, which shows the level of an audio signal, often build with LEDs on the DIY market.
The IN-9 Nixielyzer now separates this audio signal into six selective bands and show their special audio level within this frequency range:

• 63 Hz = Low Bass (e.g. Bassdrum)
• 150 Hz= Mid Bass (e.g. Bassguitar)
• 330 Hz = Low Mid (near concert pitch of the most musican instruments)
•1 kHz = Mid of voice frequency (e.g. the "beep" sound for indecent words in interviews)
• 3.3 kHz = Presence (e.g. "sch" in the word Schedule or the imitated sound of a steam locomotive)
• 10 kHz = Heights (e.g. "sssss")