“You can’t manage what can’t be measured.”

Add one of the affordable new USB reference microphones to Spectralissime running on the netbook and you have a potent, affordable toolset for high-quality measurements. This was once the exclusive domain of high-dollar specialty gear!
It’s a real treat. Highly recommended.

– Graves On SOHO Technology Blog


SPECTRALISSIME is a stand-alone Realtime Spectrum Analyzer (RTA) for Windows.
It is based on a high-precision band-pass filter bank – adapted to the human hearing.

SPECTRALISSIME supports any audio source (WDM, KS, MME, ASIO, VBAN) and manages up to 64 I/O on an ASIO device.

Typical Use Case: Professional measuring tool with a calibrated microphone (see manual).


Freq. Bands

24 Bit/96 kHz

-140 to 0 dBfs

10 to 100

Updates per sec

20 Hz – 20 kHz

Constant Precision

SPECTRALISSIME supports Windows XP, VISTA, WIN7, WIN8, WIN8.1, WIN10 (32/64-bits).

Audio Engine
44.1, 48, 88.2 or 96 kHz
DSP Processing
Monitoring Output
WDM, KS, MME, ASIO (32 kHz to 96 kHz) – 1 to 8 channels
Physical Inputs
WDM, KS, MME, ASIO (44.1 kHz to 96 kHz) – mono or stereo.
Virtual Input
VBAN Input
VBAN Stream (44.1 kHz to 96 kHz) 44.1, 48, 88.2 or 96 kHz
MIDI Remote
– none –
Bands Number
60, 120, 240 bands (FAST or RTA).
Measure Number
Single analysis possibly coming from stereo signal (A, B, A+B, A-B).
10 to 1000ms (including standard SLOW, FAST, IMPULSE).
A, Z (Flat).
Level Scale
6dB,10dB and Isophonic scale(140 dB dynamic).
Frequency Scale
Decade (x10), Octave (x2) and Music (20Hz to 20 kHz).
Level Scale
6dB,10dB and Isophonic scale(140 dB dynamic).
Display options
Max, Average, PEAK, RMS, Peak detector (Bubble).
XML file



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RTA with 60, 120, 240 bands.

SPECTRALISSIME provides 60, 120 and 240 bands frequency analysis through two kinds of filters: FAST Analysis and RTA Analysis on a 24 bit resolution range (-140 to 0 dBfs). It performs a frequency analysis with the same constant precision on the full-range of 20 Hz – 20 kHz – 10 to 100 times per second. Thanks to the consistent spectrum analysis SPECTRALISSIME allows a better understanding of any audio phenomena.

SPECTRALISSIME can analyze any audio sources, coming from an audio interface with ASIO, MME, WDM or KS interface format. Alternatively it can analyze audio from a VBAN Stream (LAN). The integrated monitoring option allows to use another Windows audio device to monitor the analyzed signal.

SPECTRALISSIME can display PEAK or RMS values on the spectral analysis and on the meter view, displayed on the right. It offers the possibility to display AVERAGE and MAX levels (with a HOLD option).

The display options provide settings for scale limits and sub unit display. The green cursor (on the left) sets the nominal level threshold (displayed in yellow). The red cursor (on the right) allows sets the max level threshold (displayed in red). A click on the
scale sets the threshold on the desired level.

The Average Level is given by a small bar on each frequency bar. The MAX Level is displayed behind the current measure in dark blue (or dark green). The yellow and red ranges can be defined, by simply moving the cursor on the left (green arrow) or on the
right side (red arrow).

SPECTRALISSIME provides different integration times through FPS selection (frame per second). For dB SPL measures, standard integration times are SLOW, FAST & IMPULSE. The Weighting menu allows the selection of A-Weighting or Z (neutral per default).


is based on more than 15 years of experience in digital measurements and one of our most successful audio tools from 2001:

Frequencies Analyzer.

The current SPECTRALISSIME combines simple operation with new essential functions for high-end, realtime audio analysis.



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“Bubbles” and Scales

Peak Bubbles

SPECTRALISSIME can display 3 bubbles showing 3 peak detections in 3 frequency ranges: (20 Hz – 200 – 2000 – 20 kHz).

Musical Bubble

SPECTRALISSIME also proposes to display musical Bubbles showing the musical note related to the frequency peak. If frequency scale (music) is selected, a piano keyboard will be displayed as frequency scale and the musical level notation will be displayed in the dB SPL scale (on the right). If the Isophonic scale is selected, the musical Bubble will also display level in musical notation.


SPECTRALISSIME provides 3 scales: 6 dB scale, 10 dB scale or isophonic scale (displaying dB SPL). For each scale type, a sub menu allows selecting additional option to display sub unit and set min / max dB range. SPECTRALISSIME also provides 3 frequency scales: the decade scale (more used in electronic), the octave scale (adapted to music analysis) and the musical scale (displaying a keyboard).

Isophonic Scale

The Isophonic scale displays the Sound Pressure Level (in db) and the equal-loudness contours curves for the human ear on the following main units: 20, 40, 60, 80, 100, 120 dB SPL. In this scale, the nominal levels (yellow) and peak levels (red) are following the equal-loudness contours curves.

This scale is also made to be used for acoustic measures, with any microphones. The CAL field allows defining a dB offset to adjust the scale to the microphone sensibility.


Use Case: SPECTRALISSIME innovates the spectral representation of the signal by introducing the isophonic scale. It allows a better understanding of the audio signal by visualizing the audible frequencies and the balance of the spectrum. Perfect for the measurement and analyzation of sound levels.

Videos & Tutorials

Standalone Application for Windows (XP, VISTA, WIN7, WIN8, WIN10 32/64 bits).
SPECTRALISSIME is distributed as Donationware!

For END USERs, SPECTRALISSIME is free to use! You pay what you want, when you want – if your find it useful. Thanks for your participation!

Use one of the Donate buttons and get a big thanks from us.

SPECTRALISSIME is affordable for everyone.

Please support our development team and help us to maintain our Audio Apps and continue to produce new amazing tools for the worldwide audio community. Thank you.

For Volume licensing and special deals, especially for company deployment or commercial distribution, please contact us to get a quotation and an agreement.