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Product 511150

Modulus Guitars Flea FB4 Bass Guitar   

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The energy and vision of Red Hot Chili Pepper's Flea inspired Modulus to create a bass guitar that bears his name. Now it's becoming a choice for pla...Read More

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A Flea bass for everyone.

The energy and vision of Red Hot Chili Pepper's Flea inspired Modulus to create a bass guitar that bears his name. Now it's becoming a choice for players making their own names. The Flea Bass 4 has a uniquely shaped double-cutaway alder body. Space age carbon fiber neck has a compound-radius composite fingerboard, pearl dot top position markers, and bidirectional relief adjusting rod. The Basslines MM pickup is controlled by an Aguilar active preamp. Includes hardshell case.

In the quest for neck-snapping, butt-shaking, groove-making tone, the Modulus FB4's carbon fiber neck will give you a huge head start. Each neck is a lightweight, ultra-rigid D-shaped shell made from dozens of layers of hand-formed, aerospace-grade, epoxy-impregnated carbon fibers. It rules for producing unclouded, even tone with abundant low and high harmonics. Because carbon fiber telegraphs attack more quickly than conventional wood necks, it also aids articulation and clearly pronounces attack dynamics. A nonstructural relief adjusting system adjusts in both directions, allowing for underbow and overbow. And your maintenance woes are over. Carbon fiber is totally impervious to the ravages of moisture and temperature changes. From fit to finish, this neck is pure bass voodoo.

  • Double-cutaway alder body
  • Space age carbon fiber neck
  • Compound radius composite fingerboard
  • Pearl dot position markers
  • Bi-directional relief adjusting rod
  • Basslines MM pickup
  • Master volume and 2-band EQ
  • 34" scale
  • 22 frets
  • 1.56" nut width
  • 2.45" width at 22nd fret
  • 19mm string spacing

Be like Flea. Order today.


Review Snapshot

by PowerReviews

(based on 30 reviews)

Ratings Distribution

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Reviewed by 30 customers

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(2 of 3 customers found this review helpful)


Modulus-Fine basses bad service

By Metro-

from Undisclosed

I have two Modulus basses a Flea FB4 and a Quantum 4. They both have a great modern sound, that I use for that type job. The Q-4 developed a separation problem with the phenolic fretboard splitting from the composite neck. It show a separation from the top fret to the G# on the E string. I treat my basses with great care so I do not know why this happened.This is where the major problem comes in. Only Modulus can answer the questions I have. I called the dealers, guitar techs, etc...they all tell me to cantact Modulus. I have tried & tried. Called many, many times to customer service..nothing...e-mail customer service numerous times...NOTHING. So I have a bass that the fretboard is comming apart and can get NO answer. This is very, very poor "customer service". As long as the bass hold together it is a very fine instrument, but if you have a problem...you are sunk.


Not just for techno funk

By Miss Kim-OTta-

from Ohio

My first bass was a Gretch "Monkee" model, so I've played different instruments and styles. This instrument is a joy to play and can assume about any sound on a flexible amp. I purchased a "B" stock model, so I got a great price. I wish these were more affordable products. Modulus customer service needs to improve somewhat to match Yamaha who sets the standard as far as I'm concerned. Of course, I could say the same about many other companies...


Worth Every Penny

By Joe

from Lynchburg, VA

I've been saving up for this bass for a very long time and I must say it was worth every second of hard labor. When I first played it I was immediately impressed with how much brighter and fuller of a tone it had than any other bass I had ever played. But when I started adjusting the string height and messing with the tone is when the amazement really started. I can get almost ANY tone I want out of this bass if I set it right. The carbon fiber neck leads to domination on the frets. I have also lowered to action to levels that would kill any other bass and there isn't a dead spot on this thing. I'm running it through a GK BackLine 112 amp and I can get any of Flea's tones with ease. I don't ever plan on using another bass other than the Modulus Flea Bass. It truly is amazing and worth every penny.

(1 of 1 customers found this review helpful)


Near Perfection

By Vidman

from Jordan, MN

This bass is simply amazing. Very comfortable neck and a very responsive pickup. The carbon fiber neck creates even response across the board (no dead spots here!). Of course $2500 is a serious amount of dough to fork over, but I firmly believe that you can spend a ton more money than this and not find a better product. I'm nit-picking here, but the only thing I would change about this bass is that you have to unscrew the back panel off to change the 9v batteries. A separate access to the batteries would be nice.



By Anonymous

from Undisclosed

The carbon neck is really different due to its light weight and super-even fret response. Some players will not prefer it but I think that's nitpicking. Try this bass and you'll be impressed with the feel of the neck for sure, it's an incredible technological advance for the instrument.


Top of the Line

By Flea Enthusiast

from Turlock, CA

I have owned my FB4 for a couple of years now and do not plan on upgrading ever again. I have not found a bass that is comparable to this in regards to sound, look, and feel! The tone is very distinct and this thing sounds great in any style of play. If you want versatility and quality across the board go with this. A little pricey, but if you got it, go for it.


Gnarley Bass

By nick-qFWOt

from Madison, AL

My bass teacher has this bass and it is a BEAUTY!! Modulus Flea FB4 Bass has an outstandingly amazing tone. Probably the best bass sound i have ever heard. Its a little pricey but Flea's signature ain't gonna be cheap.


I've got fleas

I own a very "shop worn", and accordingly, well priced early model with Bartolini pickups. The selling factors included its resistance to neck warping and feedback, as well as its sonic versitility. On the right amp, this instrument can go from 2006 back to to 1966. Often, I run mine in stereo with two different brands of 1x12s. (Think 2006 and 1966 again.) My biggest surprise was finding I can fly on this neck in comparison with other basses I've owed or, thankfully, borrowed. As a result, I sold my other basses and some signal processors I used to use to "improve" my sound.


A Dream Come True

By Anonymous

from Undisclosed

The sound in your head truly is the sound in this bass. Incredibly versatile, lots of punch, crystal clear tones across the fretboard, impeccable craftsmanship...What more could one want? The neck is absolutely wonderful, as are the balance and finish. The electronics have a nice bite to their sound. It's one of the best investments you could possibly make in your life.


Just for the funk of it

By mr.huckleberryslim

from Sinking Spring, PA

This bass has got to be one of the most best playing axes in the world, maybe even in the universe. Before I got this bass, I thought it was just like any other bass, but no way. The neck is so smooth and silky, no wonder Flea can play those sophisticated funk lines. It is also versatile, I can beat the crap out of it and it will withstand my neglection, or I could caress it like a baby and it will play the smoothest tones. The adjusting rod also allows me to make the the strings slack against the fretboard for that funky punk sound. The Red Hot Chili Peppers wouldn't be successful today without Flea. This bass made it possible for him. I love this bass!

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