Sadowsky Onboard Bass Preamp

Onboard Bass Preamp (4-Knob System)

  • Prewired onboard bass preamp for J-style basses
  • With a metal control plate
  • Active preamp for passive pickups
  • 4-Knob Layout with controls for: Master Volume / Balance / Vintage Tone Control (P/P) / Treble and Bass (stacked)
  • Push/Pull function on the VTC control for preamp bypass
  • Can be installed with either the included control plate or with an electronics panel
  • Frequency esponse: 5 - 50,000 Hz
  • Bass control offers +18 dB boost at 40 Hz
  • Treble control offers +18 dB boost at 4 kHz
  • Total harmonic distortion (THD): 0.18% at 1 kHz
  • Input impedance: 1 Mohm
  • Output impedance: 1 kohm
  • Powered via a 9 V battery (not included)
  • Power consumption: 9 mA
  • Installation depth: 29 mm
  • Dimensions of motherboard (L x W x D): 30 x 21 x 25 mm
  • Up to 870 hours of battery life

Note: Register your instrument at www.w-distribution.de/Warranty to extend the warranty to 4 years.

Note: Register your purchase at www.w-distribution.de/Warranty for an extended warranty of 4 years.

Further Information

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11 Customer Ratings
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4.6 /5
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I am so happy with the sound
frankbassplayer, 11.12.2020
Originally, I was very inspired after watching several movies with Roger Sadowsky on YouTube. I found that the Sadowsky Onboard Bass Preamp (4-Knob System) was available for purchase from Thomann and came up with the idea of ​​installing it in my 2014 model Fender Deluxe Active Precision Bass Special Okoume.

The Fender Deluxe Active Precision Bass Special Okoume is a 4-string constant 9 Volt active bass with PJ pickup configuration and 4-Knob System. It really motivated me that by installing a Sadowsky Onboard Bass Preamp I would get the possibility of using my bass in passive if an unforeseen accident with the active electronics should occur.

On December 3, 2020, I bought it. It arrived at the nearest post office in Norway on December 10, 2020 and I installed it the same day. I removed the potentiometers from the metal plate and removed the strips to get long enough wires so that it was ready to be installed. The original onboard preamp was then removed in such a way that the wires from the pickups, bridge and the 9 volt battery were long enough to be reused in the new installation. It turned out that I had to make the holes in the okoume body a little bigger so that I could mount the new potentiometers. I attached the potentiometers to okoume body according to the same principle as they were originally attached to the metal plate they came with.

Soldering iron was necessary, because the wires from the P and J pickup had to be soldered in their respective places on the "blend" potentiometer. An internal earth connection had to be soldered to the Sadowsky jack connector. The user manual lacked an exact description of which of the 3 soldering points on the jack connector to be used. This was solved by seeing which solder point was used on the original Fender jack and doing the same. The connection to the 9 volt battery from the Sadowsky Onboard Bass Preamp was cut off so that the wires could be stripped and soldered in on the wires from the 9 volt battery in the Fender Deluxe Active Precision Bass Special Okoume. Here I had to be extra observant and careful to avoid incorrect connection. I chose to cover this soldering to prevent unforeseen short circuits.

And then it was finally time for a test. I plugged the bass into my Genzler Magellan 350 equipped with Fender Rumble 410 (V3) cabinet. Sadowsky Onboard Bass Preamp turned out to work perfectly and much better than expected. The quality of the sound was extremely improved. Bass boost and treble boost are much clearer in the soundscape. Vintage Tone Control (VTC) is nice. Blend control between neck and bridge pickup works very well. Volume control works very well. The bass also works great in passive (Passive is activated by lifting the VTC knob).

I'm so happy with the sound that I can hardly put down the bass. Sadowsky Onboard Bass Preamp (4-Knob System) will stay in my bass.

Should you be in doubt about how this is installed according to the instructions and lack knowledge about soldering, the installation is recommended to be performed by an experienced professional. But even that is worth it. By registering the serial number, name and address within 30 days on the Warwick website, a 4-year warranty on the product is obtained.
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fr Original review (Show translation)
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Le vrai son
PhilGood54, 30.11.2020
Installé sur une Fender Jazz Bass 5 cordes Deluxe Mexicaine, ce pré ampli a réalisé l'objectif que je m'étais fixé.
Le pré-ampli Fender d'origine était déjà très bon, cependant je ne pouvais pas avoir accès à certains sons comme celui de Tal Wilkenfeld lors de son solo mythique avec Jeff Back sur "Cause we ended as lovers".
Ce pré-ampli Sadowski a réalisé ce miracle !!! Sans même changer les micros d'origine.
Le son de la corde de Si est beaucoup plus précis dans sa définition.
Le growl des micros est bien mis en avant sans avoir à trop forcer sur les attaques.
L’installation n'a pas été très facile car je m’attendais à des branchements sans soudures comme sur les pré-amplis John East.
Le manuel d'installation fourni n'est pas assez explicite pour effectuer les soudures : j'ai réussi à le faire avec certitude en regardant une photographie de ce pré-ampli déjà installé sur internet.
Si vous voulez acheter ce matériel, je vous le recommande sans hésiter.
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fr Original review (Show translation)
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Presque parfait
Slost, 30.12.2020
Monté sur une basse Bossa Ujb4.
Ça rentre très juste, voire au chausse pied.
Heureusement, la Bossa est équipée d’une trape à pile ou pour électronique d’origine. ( au cas où, et c’est le cas). Ça doit être pareil dans une JB.
Autrement, très facile à poser, j’ai dû juste dessouder le jack pour récupérer celui d’origine.
Niveau son, en passif, je retrouve le son de ma basse.
Bonne balance, le tone est très bon, par contre le volume est peu progressif.
En actif, le volume devient très progressif bizarrement, j’adore les aigus vraiment exploitables et pas trop haut perchés.
La même chose pour les basses, bien grosses sans être trop boomy et exploitables sur toute la course du potentiomètre.
Le potentiomètre de tonalité fonctionne aussi en mode actif, c’est vraiment un plus.
Les potentiomètres ont l’air de très bonne qualité et font confiance pour le futur.
La petite carte électronique, par contre, me paraît plutôt fragile, je l’ai mise dans de la mousse.
Bref, je recommande vraiment ce préampli, facile à poser, efficace et complet, ce qui ne le rend pas si cher.
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de Original review (Show translation)
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Fast sehr gut
xv666tr, 06.02.2021
Der Klang des Sadowsky Preamps ist wirklich spitze, bei der Ausführung gäbs noch die eine oder andere Verbesserungsmöglichkeit.
+ Sound aufgrund der verwendeten JFETs (keine ICs)
+ verwendete Komponenten (sehr hochwertige MEC-Potis, Metallknöpfe mit je 2! Madenschrauben
+ echter Passivmode
+ Hauptplatine sehr klein aufgrund der verwendeten SMD-Bauteile
- unnötig: viel zu dicke Kabel zwischen den Potis und die Verwendung von Pfostensteckern erschwert die Unterbringung des Preamps im Elektronikfach (bei meinem Suhr musste ich ein Poti ersetzen weil die Schaltung sonst nicht unterzubringen war)
Aber trotzdem zu empfehlen
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£111
Excluding VAT; plus £8 shipping
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
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