Vitalizer Mk3-T

Patented. Legendary. Spectacular.

The patented Vitalizer circuitry makes the Vitalizer 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.

The Vitalizer Mk3-T not only swaps the classic, golden robe of the previous model for the new, black design of the SPL Studio Series – the higher internal audio voltage of +/-18 V elevates this third generation SPL classic to greater sonic results and impresses with an even better and more detailed sound experience.


The five controls of the core of the Vitalizer


Drive controls the level going into the filter network. The level can be changed between -20 dB and +6 dB. In the center position (0 dB) the level is identical to the input level


The OVL LED indicates a potential overload of the input stages as well as internal overloads. The OVL LED lights up 3 dB before an overload. This ensures that the Vitalizer always delivers the perfect sound.

Bass Sound

The Bass Sound control can be used to adjust between two bass sound colors.

Moving the Bass Sound control from the center position (0) to the left makes bass sounds soft and warm, referred to as Soft.

If the Bass Sound control is moved from the center position (0) to the right, this makes bass sounds dry and percussive, referred to as Tight.

The scale dots on the right symbolize this contoured, tight bass sound and are therefore displayed in squares.

Video including Audio Examples

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Bass Comp

The Stereo Vitalizer Mk3-T features an easy-to-use and effective
“one-knob” compressor that is integrated solely into the bass
processing path, leaving the original bass content untouched. Attack, Release and Threshold are pre-set. Increasing the Bass Comp value on the one hand increases the compression ratio (Ratio) and at the same time lowers the threshold value (Threshold). The compressor works with a soft knee control characteristic to sound as unobtrusive as possible.

By integrating it into the bass path, the high end remain lively and airy even at strong compression rates!

The Gain Reduction LED “GR” indicates that the compressor is operating.

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Mid-Hi Tune

The Mid-Hi Tune control is used to set the starting frequency of a broad-band shelving filter. In line with the setting of Process control, all frequencies above this value right through to the end of the audio range are processed.

The control range is between 1.1 kHz (hard right) and 22 kHz (hard left).

One of the Sovtek 12AX7 double triode tubes is used within the Mid-Hi Tune filter and gives the mid frequencies even more accurate transparency with a soft and silky sound pattern.


The Process control determines the ratio between Bass Sound and
Mid-Hi Tune to the original signal and determines the attenuation
intensity of dominant mid frequencies.


The LC EQ is a mid-high processing stage built around a passive coil-capacitor (LC) network. The LC-EQ creates more presence and definition in the midrange, especially for speech intelligibility and transparency. In the high frequency range, the coil convinces with extremely low noise. The frequency can be controlled between approx. 2 kHz (Low) when panned hard left stop and approx. 20 kHz (High) when panned hard right. The high frequency structure improved with the LC-EQ ensures a cleaner separation of the instrumentation and provides silky highs.

Coils are known for their pleasant sound in filter circuits. In the 60’s, coil filters were often used, later replaced by RC filters (resistor-capacitor network) due to their high pricing. Nowadays, the coil sound is desired again, especially for the mid and high frequencies, since saturating the coil produces a harmonic behavior that is pleasant for the listening sensation. This can be compared to the difference between a tube stage and a transistor stage.


The Intensity control determines the level of the LC-EQ. As the intensity increases, the gain of the set high and mid-hi frequencies increases. At the same time, the perception time is shifted so that soft high-frequency components are not masked by loud ones. This improves speech intelligibility and clarity. The brilliance of any audio signal can be increased without sounding sharp.

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Stereo Expander

The Stereo Expander increases the width of the stereo image.

Working on established inter-channel phase principles, the Stereo Expander control is be used to increase the subjective soundstage width of any stereo source.

A Sovtek 12AX7 double triode tube is also used in the stereo expander. In it, the right and left channels are mixed together. The tube now adds its typical tube harmonic spectrum to the stereo signal, which consists mainly of straight harmonics.

In addition to widening the stereo image, the tube also produces a greater range of low frequencies, a clearer definition of reverb spacing and a softening of the high-frequency range, which has a very positive effect when processing digitally
recorded material.

The On switch is used to activate the Vitalizer Mk3-T. When activated, the switch lights up. If the device is in bypass mode, the switch is not illuminated.

When this switch is blinking, the device is in “warm-up” mode. The tubes are being brought to the optimum operating temperature.

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The De-Masking

A key feature of the Vitalizer technology 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.

Audio Masking Effect

Example: BOOM and PUNCH in the bass range

Audio De-Masking With Vitalizer®

Example: BOOM and PUNCH in the bass range

The BOOM is louder than the PUNCH and therefore shifted, making the PUNCH audible again. Result: More accented and powerful sound sound


Audio Masking Effect

Example: Vocals or instruments (choir, brass, guitars)

Vocal 1 masks the lower vocals. 2&3 will still be audible, but 4&5 will not be audible.

Audio De-Masking With Vitalizer®

Example: Vocals or instruments (choir, brass, guitars)

All vocals are audible. Result: More Detail, more transparency

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

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.

Walktrough with Hermann Gier

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Inputs and outputs

All inputs and outputs of the Vitalizer Mk3-T are equipped with Neutrik XLR jacks with gold-plated contacts and Neutrik TRS jacks. The XLR and TRS jacks are connected in parallel.
The signal transmission is electronically balanced with a nominal level of +6 dBu.

On the output side, there are two signals per output. The processed signal can therefore be sent to two different devices. In case of a double assignment of the inputs, the two input signals are mixed together.

Looks great, feels great –
and lasts for a lifetime

The Vitalizer Mk3-T has a 4 mm thick, black anodized aluminum front panel and aluminum knobs milled from solid. The housing is made of high-quality steel and is powder-coated in elegant black.

Vitalizer Mk3-T & Channel One Mk3 @ Social House

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Sounds good

With all SPL devices we develop not only according to plan, but also by ear. Many important components are installed on the circuit boards using Through-hole technology. This way we can ensure that we can use the best sounding components.

Home is where the heart is

That’s why we manufacture all devices in our own production facility in Niederkrüchten on the Lower Rhine, Germany.


Play Video
Vitalizer Mk3-T Review & Demo
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Vitalizer Mk3-T & Channel One Mk3 @ Social House​
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Mix Bus POLISH!! - SPL Vitalizer Mk3-T
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Vitalizer Mk3-T Walkthrough with Hermann Gier
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Vitalizer Mk3-T (Korean Review including Audio Examples)


(Predecessor: Stereo Vitalizer Mk2-T)
Recording Magazin
Music & PC
Sound & Vision
Sound On Sound
MP Audio
Music Store
Release Time mit Top Product Award



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

Input impedance
Output impedance
75 Ω
Maximum input level
22.5 dBu
Common-Mode Rejection Ratio (CMRR)
86 dB
Frequency range (-3 dB)
10 Hz – 100 kHz
THD + N (0 dBu, 10 Hz – 22 kHz)
0.01 %
Noise (A-weighted)
-99 dBu
Dynamic range
122 dB

Internal Linear Power Supply with Shielded Toroidal Transformer

Operating voltage
for analog audio
18 V
Operating voltage 
for relays and LEDs
12 V
Tubes anode voltage
250 V
Tubes heating voltage
12.6 V

Mains Power Supply

Mains voltage (selectable)
230 V AC, 50; 115 V AC, 60 Hz
Fuse for 230 V
T 400 mA
Fuse for 115 V
T 800 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

Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.

Other Processing-Products

Mastering M/S Processor
Mastering Compressor
Mastering Equalizer
Passive Mastering Equalizer
Power Soak
Transient Designer 500
Dual-Band De-Esser 500
Stereo Image Bigger Maker
Tube Vitalizer
Program Equalizer
DeEsser Mk2
DeEsser Mk2
Transient Designer 4 Mk2
Dynamics Processor

Calculation of VAT (value added tax)

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If your country cannot be determined via geolocation and you are not logged in as a user with the billing address of your country, the prices are displayed including the VAT of Germany (19%).

What does it actually mean …

In Stock!

The product is in stock in our warehouse in Niederkrüchten, Germany, and will be shipped the same or next working day.

We process the orders after receipt of the order and update the stock in the online shop regularly. If the product is no longer available at short notice due to high order volume, you naturally have the right to withdraw from the purchase (see Right of Withdrawal).

In any case, you will receive an e-mail with details of the delivery and the estimated delivery time.

Available soon!

The product is not in stock in our warehouse in Niederkrüchten, Germany. Usually it will be available again within 5 working days.

In any case, you will receive an e-mail with the details of the delivery and the estimated delivery time.

Of course you have the right to withdraw from your purchase (see Right of Withdrawal).

Currently unavailable.

This product is currently sold out and unavailable.

Was bedeutet eigentlich …

Auf Lager!

Das Produkt ist in unserem Lager Niederkrüchten vorrätig und wird noch am selben oder nächsten Werktag versendet.

Wir arbeiten die Bestellungen nach Bestelleingang ab und aktualisieren den Bestand im Online-Shop regelmäßig. Falls das Produkt wegen hohem Bestellaufkommens kurzfristig nicht mehr verfügbar ist, hast du selbstverständlich das Recht, vom Kauf zurückzutreten (siehe Widerrufbelehrung).

In jeden Fall erhältst du eine E-Mail mit den Einzelheiten der Lieferung und der voraussichtlichen Lieferzeit.

Bald verfügbar!

Das Produkt ist in unserem Lager Niederkrüchten nicht vorrätig. Gewöhnlich ist es innerhalb von 5 Werktagen wieder verfügbar.

Auf jeden Fall erhältst du eine E-Mail mit den Einzelheiten der Lieferung und der voraussichtlichen Lieferzeit.

Selbstverständlich hast du das Recht, vom Kauf zurückzutreten (siehe Widerrufbelehrung).

Zur Zeit nicht verfügbar.

Dieses Produkt ist derzeit ausverkauft und nicht verfügbar.


Due to Covid19 there are no events scheduled at this time.


Aufgrund von Covid19 sind derzeit keine Events geplant.