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  • No. of Frets:
    Scale Length:
    35" scale
    No. of Strings:
    Body Material:
    Alder with flamed maple top
    Neck Material:
    Graphite composite
    Body Finish:
    Polyurethane "Orange Crush" color
    Nut Width:
    Fingerboard Material:
    Bartolini dual coil pickups (emg35 size)
    Other Hardware:
    Gotoh gb7 tuners and Hipshot Detuner on E-string.
    9 lbs.
    EQ / Controls:
    Bartolini NTBT 2-band preamp; vol, pan, bass, treble

Recent Reviews

  1. Ballin'bass
    "A truly unique and amazing bass"
    Build Quality:
    Pros - Brilliant build quality with top notch fit and finish, super durable and worry free, can be set to have incredibly low action, non-tempermental neck, superb playability and comfort, very clear sound, tone that cuts like a knife
    Cons - Very unique range of tonal options that you could either love or leave (not sure that's really a con), rare to find/not many were made
    The Quantum Bass is arguably the most famous bass made by Modulus Guitars next to the esteemed Flea bass. However, Modulus is also known for making a few variations on their traditional designs, such as the Flea jazz bass, the TBX basses, basses with upgraded hardware and electronics options and, perhaps the most unique and intriguing production run of them all, the Quantum Turbo.

    The Quantum basses exist mostly as 5 and 6-stringers since far fewer 4-string models were produced. One could speculate a number of reasons for the lack of 4-string versions, one being that most people perceived the main strength of the Modulus graphite neck design being in the clarity of the low B-string and other detuned string tunings. This is a trait that I can whole-heartedly attest to. The "sweetspot/turbo" configuration is likely almost as rare as the 4-string Quantum and they were built in 4, 5, and 6-string models.
    The turbo configuration places two dual-coil soapbars so that the neck pickup is lower on the body than the standard Quantum, near where the Music Man stingray sweet spot is and sandwiched right below it is the bridge pickup with only about 1/2" of space in between them. Together in equal blend they give the bass a big command of the low-mid range frequencies, being very throaty yet smooth and articulate with a slight bump in the upper mids, right around what sounds like 700-800hz. The neck pickup soloed produces a punchy voice very similar to that of a Music Man Stingray while the bridge pickup soloed gives a very burpy, thinner, jazz bridge pickup tone. For reference I use DR Lo-riders ss 45-105 strings.

    The one I own is from 1996 and is especially rare because it is a 4-string Quantum Turbo (pictured). It came stock with Bartolini pickups and NTBT 2-band preamp, neither of which have I ever been a fan of. The pickups had too soft and polite of a tone to them. Almost "pillowy" and without much definition. Perfect for smooth jazz, dub or the like. Maybe some blues. But not for my style. The preamp, likewise, wasn't very flexible and the overall sound I got out of the bass discouraged me initially from playing it in my band as I like a strong, defined, aggressive tone for our style. However, the incredible feel and playability of the bass combined with the piano-like sustain as well as its sexy looks made me care enough to try swapping out the pickups and preamp.
    I ended up going top shelf with a set of Nordstrand big splits and a John east u-retro deluxe 4-knob preamp. With these transplants it suddenly came alive. The highly overwound split single-coil pickups (in emg35 covers) completely opened up the Quantum Turbo's potential to "bark" and "snarl" if I dug in hard, or sing richly and clean as a whistle if I played softly. But even though the dynamic capability and tonal intensity of the bass were enhanced, it still had a fairly limited usable tonal range, isolated to the lower mids. Adding the U-retro preamp broke that barrier down completely. Now the tone can be sculpted into an incredible variety of fine tuned shapes. The bass frequencies can be boosted a ton if I need it, I can add or subtract treble all I want and I can completely sculpt the mids to my liking which is paramount since the mids are the Turbo's natural territory.

    Overall I'd say the Quantum 4 string is an incredibly solid, very easy and fast bass to play with sustain for days which is even further enhanced by the upgraded 2tek bridge that mine was built with. The Turbo configuration has a particular tone range that will either make you love it or leave it. With the stock bartolinis that came in them at the time, they are not very tonally flexible but they may be just what you're looking for if that's your style. However, in spite of that, I can attest to their potential for versatility with the right electronics. They are a unique beast and if you can get your hands on one in good shape and you find the sound pleases you, don't let it go. It's a unicorn.
    Price Paid:
    $1,800 + cost of aftermarket preamp and pickups
    tastybasslines likes this.


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  1. ksukev
    Worse customer service of ANY bass company I've EVER dealt with. The difference between Modulus and Sadowsky are night and day. Roger would, I believe, crawl across broken glass to make a customer happy. Modulus won't even answer the damn phone.
    1. Ballin'bass
      Modulus has been known for poor customer service in the past, true. But the old company tanked around 2012 and then went bankrupt. They are now starting up under new ownership and they are very small scale, about 2 or 3 basses being built per month. It's all through planetbass.com. I'm sure the customer service will improve, but Tony at planetbass is usually easiest to get ahold of through email.
      Ballin'bass, Jan 11, 2016
    2. ksukev
      Good to know, man. I literally had to leave messages AT EVERY EXTENSION for MONTHS to get in touch with them. (I think I FINALLY caught a sales guy in working on the weekend, to be honest, they NEVER called me.) If I want another graphite neck bass, I'll go for a Zon or Status. I just won't risk it.
      ksukev, Jan 13, 2016
  2. Thomas Hainbuch
    Would you trade for a 6 string HS Bongo Bass?
    1. Ballin'bass
      No sir, sorry. That wouldn't be a fair trade at all. Considering that the value of this thing is about $2,400 (at least) with the upgrades and a used six string bongo hs is well under $2,000 in value. Plus this thing is too rare for me to part with and I don't play sixers. Sorry bud. But I know there's a beautiful q4 non-turbo on eBay right now going for 2,200 or so (no affiliation). It's about what you should expect, pricing wise for a good condition q4 these days. HOPE THIS HELPS!
      Ballin'bass, Jun 12, 2015
    2. Ballin'bass
      Also if you're into 6ers there is a really nice q6 going for about the same price on here. Sweet condition.
      Ballin'bass, Jun 12, 2015