Modulus Flea 4 String Bass Fb4

4.8/5, 4.8 from 6 reviews
The energy and vision of Red Hot Chili Pepper's Flea inspired Modulus to create a bass guitar that bears his name.
Flea4MetallicFlakeGreencollage2.jpg ModulusFlea43TSBcollage2.jpg
  1. Schwinge
    5/5, 5 out of 5, reviewed Aug 14, 2010
    Build Quality:
    • + splatter funk
    • - not a great value
    I have owned a modulus Flea bass for slightly over three years now, and I feel I have spent enough time with the bass to write a review of it.


    I have medium sized hands, and the D shaped neck feels quite comfortable. The glossy neck can be slightly sticky if you have sweaty hands. My modulus weighs about 9.5 pounds and DOES have a slight neck dive. The cutaway below the neck is nice, but it’s still slightly awkward to reach the highest fret. The shape of the body makes playing with the bass high on the chest uncomfortable. The Basslines pickup doesn’t have much room to support the thumb- I find it rather uncomfortable. The Lane Poor is superior in comfort.

    The fretwork is incredible. This bass permits extremely low action with minimal fret buzz, and still has no dead spots. Don’t get me wrong- this bass is a breeze to play.


    The truss rod is easy to adjust and the neck is impervious to warping from temperature changes. The nut is clean. The BAII bridge is easy to adjust and has a low profile. The Aguilar preamp gives this bass a hot signal along with plenty of bass and treble boost. The SD Basslines pickups are high quality (I ended up changing mine to lane poor but more on that later.) The wiring under the back plate is clean and well organized. Unfortunately, the batteries are beneath the back plate- swapping them takes some time. The Gotoh tuners are great- they are smooth and hold tuning very well.

    I received my Funk Unlimited with moderately high action. I was unable to lower the strings as low as I wanted- the BAII bridge could not go low enough. It was an easy fix by putting a shim under the neck pocket. After installing the shim there was a gap in the side of the neck pocket, about the width of a credit card. I have not noticed any change in tone or sustain, and the gap is probably my fault. After installing the shim I found that while the string spacing was still even, the strings were not centered on the neck.


    Imagine the sound of a Tyrannosaurus Rex vomiting thunder- in the best way possible. If you can mimic Flea’s technique, you CAN get Flea’s tone with this bass. The Basslines pickup sounds quite transparent and is very responsive to hand and finger technique. I have never heard a bass with a larger dynamic range. You can make a crunchy-punchy-explosive sound when digging in that is out of this world.

    I wanted an even more transparent tone and bought a Lane Poor pickup. The Basslines pickup was designed to mimic the Lane Poor pickup and is very accurate.

    I would NOT say this bass is versatile. It is difficult to get a traditional bass tone.

    I am still inspired by the sound of this bass. I would highly recommend buying this bass used.
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