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dbx 120A Subharmonic Synth

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The dbx 120A Subharmonic Synth delivers the throbbing low-end bass you want. It produces new, Waveform Modeled bass notes an octave below the bass in the original audio-smooth, musical, and floor-shak... Click To Read More About This Product

Available 12-31-2017 You will not be charged until order ships. Email me when this is in stock.

Gear returned in mint condition. If you're looking for a virtually new instrument in possibly less-than-perfect packaging, this is a great value.
  • Includes 45-Day, No-Hassle Returns
  • Includes full manufacturer's warranty
Gear returned in great condition, with only minor signs of use, such as slight scuffs or pick marks. It looks and plays like new and may be considered an equivalent to display units found in retail stores.
  • Includes 45-Day, No-Hassle Returns
  • Includes full manufacturer's warranty
    Warranty Options
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Ship to Store Available in: 3-7 Days (estimated) Fairfax, VA (15.38  mi) View More Stores For Availability Store Information


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The dbx 120A Subharmonic Synth delivers the throbbing low-end bass you want. It produces new, Waveform Modeled bass notes an octave below the bass in the original audio-smooth, musical, and floor-shaking even when output at system levels well below system and hearing damage thresholds. Provides 1/4" and RCA input connectors along with balanced 1/4" main outputs which can be full range (including synthesis) or HF only, plus a separate subwoofer output with level control.


  • Individual control for two ranges of subharmonic frequencies
  • Separate low-frequency boost circuit
  • Separate subwoofer output
  • 1/4" balanced inputs and outputs
  • RCA input connectors
  • Front-panel LEDs show crossover status and synthesis activity
  • Patented circuitry ensures that mid and high frequencies are not affected
  • Built-in crossover with choice of 80Hz or 120Hz crossover point
  • Enhance bass audio material for use in such applications as nightclub and dance mixing, theater and film sound, music recording, live music performance, and broadcasting
Pro Coverage
2 year warranty for products purchased from us, with the exception of the 480 series.

Pro Coverage gives you added warranty protection for your gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Click To Read More About This Product.

Pro Coverage includes
  • Accidental damage protection
  • Expedited repair or replacement
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to five years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews

Review Snapshot

by PowerReviews
dbx120A Subharmonic Synth

(based on 3 reviews)

Ratings Distribution

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Reviewed by 3 customers

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(5 of 7 customers found this review helpful)


nice device

By juan david

from Chihuahua, Mexico

Comments about dbx 120A Subharmonic Synth:

It's a really nice device If you want deep and extended bass and It helps you to keep the "original program" bass. The only bad thing is that its not so easy to get the proper set.

(4 of 4 customers found this review helpful)


Really nice bottom end


from Phoenix, AZ

Comments about dbx 120A Subharmonic Synth:

I installed an JBL EON system in a game room for a client that loves it loud, he and I were front and center for Pink Floyd at Sun-devil stadium with JBL surround sound years ago. The system has 2 wall mounted 515s and the 518 sub on a Mackie 802VLZ with a media server PC, cable box and X-Box as inputs. The system sounds great and the client loves it but the sub just needed a bit more to really come alive and pushing the mixer EQs just wasn't doing it. I added the dbx 120A today and WOW!!! After setting it up, I was amazed how the system woke up. The x-over in the dbx works better than the one in the EON sub. There is plenty of adjustment to really tailor the bottom end to you liking. There is a sub level control and a separate control for the sub-sonic levels and how they blend with true bass. Separate level controls also for the low bass and really low base are also very nice. Very clean sounding and musical when tuned well. I like it better than the sub-sonic filter in the Drive-rack units that I use a-lot. I spent hours listening to all kinds of music and some action movies and had to run from the cops a bit on NFS Hot Pursuit and you could feel the bass in your chest like a live show or night club, we won't talk about sunglasses or keys falling off the counter or the garage door rattling in the front of the house. A really great product that I will use again - highly recommended...


Make your system awesome, or melt your subs....your choice.

By Chris R

from 'murica

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  • Clear Sound
  • Professional Functions
  • Versatile


    Best Uses

    • Events
    • Mobile DJ
    • Performances

    Comments about dbx 120A Subharmonic Synth:

    This replaced a Behringer UltraBass rack mount. I am just blown away at how versatile this thing really is.

    If you have waaay more sub and waaay more power than you really need, get this !!!

    You have to be careful to not try to get just any sub to produce the lows that come out of this unit. I have two custom 18 boxes that reasonably get down to 36, but I have a HPF that cuts everything below that. Using this will also suck dry a 2400W amp dedicated to the subs.

    With some common sense, you can get some amazing bass.

    The dual bands make dialing-in the rumble and shake quite easy. It has a built-in crossover, too. I wish it had a built-in compressor for the lows, but I have an ancient compressor that now gets used to keep me from totally destroying my subs.

    Again, my only advice....Physics. You can not get 26Hz @ 110db out of just about any speaker a normal person can purchase, no matter what the specs say. If you try to get lows out of your subs that they can not physically produce, it will sound horrible and you _will_ damage the speaker/driver, not to mention wasting an immense amount of amp power. Most subs will fall off around 40 and that's fine. Just be careful with the adjustment knobs for the super lows. Maybe even think about getting some kind of High Pass Filter or parametric EQ that will cut below 40...

    I think that if you have reasonable expectations from this device, you can certainly improve your rig... especially a DJ.

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