EQ573-II - EQ Série 500, style Neve - DIY Analog Pro Audio
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  • EQ573-II - EQ Série 500, style Neve - DIY Analog Pro Audio
  • EQ573-II - EQ Série 500, style Neve - DIY Analog Pro Audio

EQ573-II Egaliseur pour série 500

459,00 $
459,00 $ TTC
459,00 $ HT

L' EQ573-II est un équaliseur paramétrique basé sur le design et les composants utilisés à l'origine dans les modules 1073 et 1084 des consoles Neve, qui a été adapté au format '500' d'API*.

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LIVRAISON GRATUITE à partir de 900€
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  Livraison monde

Expédition les lundis et jeudis.

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(à modifier dans le module "Réassurance")


EQ573-II

Bootstrap Image Preview


L' EQ573-II est un équaliseur paramétrique basé sur le design et les composants utilisés à l'origine dans les modules 1073 et 1084 des consoles Neve, qui a été adapté au format '500' d'API*.

L'EQ573-II peut être utilisé de manière autonome, mais également en tandem avec le préampli MP573, en insertion entre les étages d'entrée et de sortie, recréant ainsi l'architecture complète du 1073.

L'EQ573-II est le successeur de l'EQ573. L'amélioration porte surtout sur la facilité d'assemblage et la fiabilité du produit final. Le comportement audio est le même, les seules différences étant l'absence d'atténuation lors de l'insertion dans un MP573 et la suppression du Q intermédiaire dans la bande moyenne.

Il suffit de l'installer dans votre rack LunchboxTM compatible API* pour commencer l'enregistrement.


Points remarquables

    • Equaliseur à trois bandes et filtre passe haut
    • EQ "High shelf": +/-16dB @ 10kHz, 12kHz, 18kHz, 20kHz, 25kHz
    • EQ "Mid": +/-18dB @ 0.27kHz, 0.36kHz, 0.5kHz, 0.7kHz, 1.1kHz, 1.6kHz, 2.3kHz, 3.2kHz, 4.8kHz, 7.2kHz, 10kHz
    • EQ "Low shelf": +/-16dB @ 20Hz, 35Hz, 60Hz, 110Hz, 220Hz
    • Filtre Passe-haut: -18dB/octave @ 25Hz, 45Hz, 70Hz, 160Hz, 360Hz
    • Fréquences supplémentaires dans toutes les bandes
    • 2 valeurs de Q pour l'EQ "Mid" (1073, 1084-Hi)
    • Commutateur Pre/Bypass/XLR en face avant permettant l'utilisation en insertion sur le MP573 ou autonome
    • Circuit asymétrique en classe A
    • Circuit à inductances Carnhill
    • Disponible assemblé ou en kit complet (tout inclus)

Bootstrap Image Preview

Contrôles

1 Fréquence du filtre "High shelf" : De 10kHz à 25kHz (OFF=désactivé).

2 Niveau hautes fréquences : Règle l'atténuation ou l'amplification des fréquences hautes de -16dB à +16dB.

3 Interrupteur Q élevé : Modifie le Q du filtre "Mid band".

4 Frequence du filtre "Mid band": De 270Hz à 10kHz (OFF=désactivé).

5 Niveau du filtre "Mid band" : Règle l'atténuation ou l'amplification des fréquences de -18dB à +18dB.

6 Fréquence du filtre "Low shelf" : De 20Hz à 220Hz (OFF=désactivé).

7 Niveau basses fréquences : Règle l'atténuation ou l'amplification des fréquences basses de -16dB à +16dB.

8 Source Selectionne la source de l'EQ entre la XLR et un préampli MP573 connecté (OFF=bypass).

9 Filtre passe-haut : de 25Hz à 360Hz (OFF=désactivé).


Que contient le kit ?

Absolument tout!

  • Les composants passifs (résistances, condensateurs, inductances),
  • Les 2 inductance Carnhill,
  • Les composants actifs (diodes, transistors, ...),
  • Les éléments de commande de la face avant (interrupteurs, potentiomètres, commutateur rotatif, boutons),
  • Les connecteurs, relais,
  • Les circuits imprimés,
  • la face avant et la plaque latérale,
  • La visserie.

Vous n'aurez qu'à apporter la soudure (choisir une soudure de bonne qualité, diamètre 1mm max) et la Lunchbox.


Niveau de difficulté

L'EQ573 est un kit assez complexe en raison d'une densité élevée et d'un nombre de composants assez important.

Il n'y a pas de réglage.

PK008

Références spécifiques


Technical specifications

Mesure Conditions Valeur
Courant d'alimentation au repos Pas de signal d'entrée I = +/- 40mA
Impédance d'entrée f=1kHz sur entrée XLR 20kΩ
Niveau d'entrée maximum sur entrée XLR +25dBu
Niveau de sortie maximum avant écrêtage sur sortie XLR +26dBu
Amplification/atténuation max hautes fréquences   +/-16dB
Amplification/atténuation max fréquences moyennes   +/-18dB
Amplification/atténuation max fréquences basses   +/-16dB
Atténuation filtre passe-haut   -18dB/octave

The Sound Skulptor EQ573-II (Revision 2.2) is a professional-grade, inductor-based equalizer designed for the 500-series format. It is a hybrid architecture combining high-performance operational amplifiers, discrete transistor gain stages, and passive LC (inductor-capacitor) filter networks.

1. Input Stage and Buffering

The signal enters the unit through the balanced IN+ (B10) and IN- (B8) pins. An OPA2134 operational amplifier (U1.1) serves as the initial input buffer. Relays (RLY1.1, RLY1.2) manage the bypass and routing, including an external Send/Return insert point at J2 which is used to insert directly in the MP573 preamp.

2. First Discrete Stage: Low and High Band Equalization

Following the input buffer, the signal enters the first of two discrete Class-A amplification stages.
  • Discrete Amplifier A: This stage is built using a trio of BC550transistors (Q1, Q2, Q3).
  • Feedback-Loop Filtering: Frequency shaping for the low and high bands is achieved by placing the filter networks within the feedback loop of this amplifier in a Baxandal style.
  • Low Frequency (LF) Band: Managed by the 47kA potentiometer (P2) and a bank of capacitors (C35 to C44) . Frequency selection is controlled by SW4.
  • High Frequency (HF) Band: Controlled by the 10kA potentiometer (P1) and capacitor bank C25 to C34. Frequency selection is handled by SW3.

3. Second Discrete Stage: Mid Frequency (MF) Equalization

The signal proceeds to a second dedicated Class-A gain stage for mid-range processing.

  • Discrete Amplifier B: Utilizes another set of BC550C transistors (Q4, Q5, Q6).
  • MF Band Filter: This stage features a passive LC filter in the amplifier's feedback loop (INb to OUTb).
  • MF Controls: Shaping is performed by the multi-tap L2 inductor and a series of capacitors (C48 through C59) selected by SW6 . Gain is adjusted via the 10kA potentiometer (P3).

4. High Pass Filter (HPF) and Output

Once the signal has passed through the three equalization bands, it reaches the High Pass Filter and output driver.

  • High Pass Filter: The output of the discrete stages (Node B) feeds the HPF section. This filter uses the L1 inductor in an LC configuration. The cutoff frequency is determined by SW1, which switches between capacitors C13 to C22 .
  • Output Driver: The filtered signal is buffered by the second half of the OPA2134 (U1.2) and then balanced for the final output by the THAT1646 line driver (U2). The balanced signal exits via OUT+ (B2) and OUT- (B4).

5. Power Supply and Voltage Rails

The unit utilizes the standard 500-series +/-16V power supply.
Protection: IN4004 diodes (D3, D4) provide polarity protection.
Discrete Audio Rails: Stable local voltage rails (V+a and Va-) for the discrete transistor stages are created using an RC filtering network with C83 (330uF) and C84 (1000uF) capacitors.


Assemblage et test du EQ573

Avis

Note 
Quality

Reinhard M
02/04/2026

Great EQ - love it

After the LA502, the EQ573-II was the second module I built. The EQ is significantly more complex than the compressor. The most important thing — and here I agree with the previous speakers — is to take your time. You have to work very carefully, especially when mounting the many capacitors. If you work neatly, they fit well on the board.

And now for the most important part: the sound. It’s a treat to listen with just your ears. I really enjoy working without the distraction of colorful EQ curves.
The highs are addictive. I have to keep reining myself in. With vocals and acoustic guitar, you reach your goal very quickly and put a smile on the musicians’ faces during recording.

Note 
Stefan
05/07/2022

my 2nd DIY-Module

This Module was my 2nd DIY build. After I learnd my lesson on my 1st build, what it means to organise all parts befor you start, It was a joy to build this EQ.
And in the end, the most important thing is, this module rocks!!! Compared to my UAD 1073 EQ the EQ curves are very similar and the sonic characteristics are very close, but through the hardware unit, the signal has more body, is more 3 dimensional. I really love this peace of gear. Next thing is building the MP573 an run the EQ through it...Thank you Jean-Pierre for these beautiful kits.

Note 
Matthias
23/11/2018

Perfect! The classic Neve EQ and very musical

This EQ needs a lot of patience and concentration while building it, but it is absolutely worth the effort. It’s the perfect supplement for the MP573 preamp. I use it in my studio for tracking on every single track. It’s so musical that you rarely need any other EQs with more bands. If the sound is allowed to get coloured in a nice way you can even use it for mastering – I did this and achieved great results in no time (faster than with a Pultec). It’s great that the EQ573 combines the 1073 and 1084 models: You have a bandwidth switch for the mid frequencies and more frequencies available for the high shelf. It’s worth looking at the frequency response while using it (with Waves Q-Clone for instance) – you begin to understand why you don’t need more EQ bands for a perfect sound ;-)
I disagree with the other reviewer here: I don’t find it harsh at all (if you use it "correctly"). But as always, you should also consider using it for cutting the frequencies you don’t need and not only for boosting. With a reasonable combination you have a high class musical sound and lots of possibilities.

Note 
ZMFG
01/08/2018

Good For Certain Things

For the record, I had never soldered before I bought my first Sound Skulptor kit (CP5176). Also, I am not a trained recording engineer. This is the only Sound Skulptor I would give a 4 (out of 6 I own). What I've noticed after using this for a little over a year is that it can be a bit harsh. I use it more for HF/LF cut, and gentle tuning in the inner frequencies. I run it "inside" of my MP573 (which I love!), and occassionally in series when I am not getting the results I'm looking for. The build is a little tricky getting the pots and set up straight, but I had a lot of fun learning how this parametric structure works.

Votre commentaire

EQ573-II Egaliseur pour série 500

L' EQ573-II est un équaliseur paramétrique basé sur le design et les composants utilisés à l'origine dans les modules 1073 et 1084 des consoles Neve, qui a été adapté au format '500' d'API*.

Votre commentaire