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SPL Stereo Vitalizer Mk3-T Program Equalizer  From SPL

The patented Vitalizer circuitry makes the Mk3-T an unsurpassed sound designer. Whether live or in the studio, audio productions sound more alive, have more details, more transparency, a higher perceived loudness and, if required, an overwhelming bass foundation.



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Manufacturer's Description from SPL

The Vitalizer is based on findings of psychoacoustics and audiometry. 

Its filter network is one of the few patented filters.

It makes the richness of detail of audio signals more audible. Interventions in the sound image are more of a musical nature. Music productions sound more natural, lively, differentiated, easier to understand, more deeply layered and more widely spread apart.



Drive controls the level going into the filter network. The bass emphasizes a soft or hard tone  and the compressor catches level peaks.

Mid-Hi Tune sets the frequency of operation above which frequencies are boosted and below which frequencies are cut.

Process Level adjusts the intensity of Mid-Hi Tune and bass.

In addition to the Vitalizer core circuit, the Stereo Vitalizer Mk3-T features a high frequency and harmonics stage with coil filters (LC) and a stereo expander to broaden the stereo image.


The De-Masking

A key feature of the Vitalizer is the unmasking of superimposed sound components. The Vitalizer thereby relates the time of perception of a frequency to its amplitude. Through a minimal temporal offset of loud frequencies, quieter, previously superimposed sound components are “de-masked” and thus become audible.


The Adaptation to Curves of Equal Loudness

The non-linear sensitivity of the human hearing is described already in the 1930s by the “Fletcher-Munson curves”.

These “curves of equal loudness” (today defined by the standard ISO 226:2003) illustrate the equal perception of  loudness as a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones.

The Vitalizer adapts the frequency spectrum to the curves of equal loudness, which improves the loudness perception in particular.


Inputs & Outputs

The two channels of the Stereo Vitalizer Mk3-T are equipped with Neutrik XLR sockets and jack sockets connected in parallel. The signal transmission is electronically balanced with a nominal level of +6 dB.


About Manufacturer

Sound Performance Labs! Full Range of Analog, Tube, and Digital rack gear with an innovative twist. With their most famous transient designer product, SPL has quickly become a household name in both the recording and live sound arenas.


Analog inputs & outputs; XLR & TRS Jack (balanced)

Maximum input gain

22 dBu

Input impedance

22 kΩ

Output impedance

600 Ω

Common mode rejection (1 kHz)

85 dB

Frequency range (-3dB)

10 Hz – 100 kHz

THD + N (0 dBu, 10 Hz – 22 kHz)

0.0019 %

Noise (A-weighted)

-99 dBu

Dynamic range

121 dB


Internal Linear Power Supply with Toroidal Transformer

Operating voltage for analog audio

+/- 15 V

Operating voltage for relays and LEDs

+12 V


Mains Power Supply

Mains voltage (selectable)

230 V AC / 50; 115 V AC / 60 Hz

Fuse for 230 V

T 315 mA

Fuse for 115 V

T 630 mA

Power consumption

max. 20 W


Dimensions & Weight

W x H x D (width x height x depth)

482 x 44 x 237 mm

19 x 1.73 x 9.33 inch

Unit weight

3.4 kg

7.5 lbs

Shipping weight (incl. packaging)

4.75 kg

10.47 lbs