RAAL 1995 Immanis FilterSet

Full Product Description

Frequency Response Measurement & Correction

The Immanis is a fast, open, but bright sounding headphone. The headphone’s frequency response is a bit uneven starting with a 2 dB bass bump below 80 Hz. This is followed with a few smaller bumps in the 150 Hz, 300 Hz, and broader bump in the 400 Hz to 1.5 kHz region. There is a dip in frequency response in 1.5 to 2.5 kHz region followed by the largest deviation of +6 dB in the 3kHz to 6 kHz region which gives the headphone a distinctively forward sonic signature.

Engaging the high-resolution neutral convolution filter produces a ruler flat response, eliminating the “in your ear” upper midrange peak resulting in a neutral sound. The soundstage and depth of field is increased with the lead vocals and instruments “sitting in the pocket” of the mix.

The chart above plots the neutral frequency response. The bass extension filter restores Alex’s bass bump and extends the low frequency response to -3 dB at 20 Hz. The treble extension filter maximizes the high frequency resolution capabilities of the headphone. Depending on the music genre, quality of the mix and master, and how loud you listen, there is a filter to match.

Equalizing the headphone flat also equalizes the minimum phase response:

Ensuring flat minimum phase response through the midrange and high frequencies maximizes the immense and open sound stage of the Immanis. One could be convinced it is like a nearfield monitoring setup using speakers but without the room acoustics (or poorly designed monitors) messing up the soundstage. The Immanis with the FIR correction filters provides the most realistic sound stage better than any other headphone in this collection. A unique immersive listening experience.