Baby Benthic Bass Unit 5.25" Passive Woofer

Baby Benthic Bass Unit 5.25" Passive Woofer


Price is for a single unit.

Ships worldwide from Tacoma, WA.

Orders are pre-paid.  Call or email for a lead time estimate at the time you are ready to place your order.

60 day in-home audition, 1 year warranty

This Passive subwoofer receives its input power from an Outboard Subwoofer Amplifier.  

Need help?  Feel free to call (206) 407 8439 for advice

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New! Baby Benthic Woofer that is smaller, less expensive, and still gives seamless integration with Orcas, Marlins, and Tritons used as single woofers or in stereo subwoofer pairs.

In search of ample bottom end to mate with your full rangers, consider the luxury of a passive subwoofer system, built in the same way as our full range cabinets to give tonally correct, powerful, omnipresent bass response. 

We've designed a passive subwoofer to facilitate near-perfect sonic integration with our fullrange speaker designs.   

Full range speakers have unique needs in terms of mating to any kind of subwoofer - active or passive.  By mimicking the hookup methodology and acoustics of large format passive subwoofers meant for recording studios in a smaller, compact package, we have attained the kind of performance and seamless sonic integration from a compact unit that is typically reserved for much more expensive subwoofer setups.

We have effectively addressed the common issues of poor subwoofer sound quality by considering that subwoofers are important speaker enclosures in and of themselves, even though they are only covering the one or two octaves that the full range speakers we've designed (Marlin, Orca, Triton) do not make it down to.  Furthermore, we have chosen a specific outboard subwoofer amplifier that works well with our passive subwoofer and full range speaker models.   


  • 11 3/4" x 6.5" x 8.75"
  • Passive subwoofers are compatible with any external subwoofer amplifier including our Outboard Subwoofer Amplifier models.
  • ~29hz response on the low end.  High frequency rolloff is set by external amplifier to mate with the acoustic roll off of the full range speaker.
  • (45hz for Triton, 90hz for Orca, 100hz for Marlin)
  • works well in either small rooms or large spaces
  • Can be networked into 4 pair arrays of subwoofers off of a single subwoofer amplifier by using our Octopus cables.
  • Selection of any cabinet material will yield nearly identical acoustical qualities due to internal bracing

The New Baby Benthic Bass Unit is a completely redesigned Dungeness Deluxe+Dungeness Max combination model released in early November, 2016.  The Baby Benthic Bass Unit now has solid Douglas Fir internal bracing, ideal golden ratio box proportions, A new, high excursion 5.25" subwoofer driver, and is a passive unit - which is acoustically ideal. 

All Baby Benthic Bass Units are outfitted with a subwoofer-adapted full compliment of parts found in our Depth of Field Enhancement Kit that goes into our fullrange speakers, as well as other enhancements native to this speaker design. These components were 10 years in development as of November 2016, but are applicable to older Blumenstein models via the Kit found here.

On the Benthic

The Baby Benthic Bass Unit is named after the ecological region at the lowest level of any body of water. The Benthic region can extend very deep into the ocean, into its lowest depths. 

Subwoofer Design History

With the release of the Baby Benthic Bass Unit subwoofer model, we have attained a new level of performance and acoustic integration from our subwoofer.   Mainly, this happened by making them passive cabinets, with the same quality solid wood internal bracing as is found in our full range loudspeakers.  Additionally, the new Baby Benthic Bass Unit's upgraded 5.25 inch woofer driver works with this passive, stiff-as-concrete-cabinetry to give an even quicker liquid presentation to the lowest regions.

The Baby Benthic Bass Unit is really a "Best Of" Blumenstein Audio subwoofer.  

In mid 2016, we decided that we needed to make an ultimate, super compact, lower power subwoofer model in order to keep up with the recent enhancements to the sound quality in the rest of our full range lineup.  So we went back, looking forward and borrowed our favorite features from our best subwoofer models from the past, that we've made from over the years.  We found an even more prodigious sounding and lighter woofer driver with an improved magnet, with stronger, lighter cabinet stiffening technologies borrowed from our Marlin, Orca, and Triton full range bracing topologies.  

Passive subwoofers are cleaner.  Period. 

Passive Subwoofers are acoustically clear of any smear or drag to the mid-bass and lower midrange because of the dead weight of a subwoofer amp chassis is missing.  A passive subwoofer can be hooked up to any commercially available subwoofer amplifier via the binding posts on the back of the enclosure (just like our full range loudspeakers can be hooked up to any commercially available stereo amplifier with excellent results)

Hassle Free Subwoofer Amplification

When hooked up to one of our new higher power Outboard Woofer amplifiers, especially the Hypex, the Baby Benthic Bass Unit will completely disappear into the mix while simultaneously astonishing you with all those low notes you've never heard/felt so clearly.  The Dayton is a great sounding subwoofer amplifier as well.  The point is, that because the Baby Benthic Bass Unit is a passive, acoustically purist enclosure, it can only make the most out of any subwoofer amp that it is hooked up to.

Enhanced Active Crossover compatibility

The Baby Benthic Bass Unit can be used to support a wide variety of loudspeakers and has been specifically voiced to be able to mate its prodigious bass support seamlessly with any of our full range speaker models (MarlinOrca, and Triton) when the Outboard woofer amplifier is given its appropriate recommended settings.  (recommended settings are supplied with each model upon purchase).

While the physical size of the Baby Benthic subwoofer is the smallest of any we have ever built, its bass sound quality, power, convenience, ergonomics, longevity, and suitability to almost any environment is by far the best we've ever offered in our lineup.  This is the one subwoofer that does it all!