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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... Read More

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  • Pro Coverage Eligible
    Pro Coverage Eligible Pro Coverage will repair or replace your gear quickly and get you back playing, gigging and recording as fast as possible-even accidental damage from drops or spills is covered.
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    Free Shipping This item qualifies for free ground shipping anywhere within the contiguous United States.
  • Easy Returns
    Easy Returns If you're not happy with your purchase, we give you 30 days to return it for a full refund or exchange.

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
2 year warranty for products purchased from us, with the exception of the 480 series.

Pro Coverage gives you added warranty protection for your new 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 Read More.

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


by PowerReviews

(based on 2 reviews)

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Reviewed by 2 customers

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(1 of 1 customers found this review helpful)


Really nice bottom end


from Phoenix, AZ

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...

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(5 of 7 customers found this review helpful)


nice device

By juan david

from Chihuahua, Mexico

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.

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