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SubMersive HP+ & HP-Slave Subwoofer

(5 customer reviews)


Additional $200 savings through December 22nd on select finishes.

The SubMersive was the first product offered by Seaton Sound in 2006.  The first owners were all avid enthusiasts who learned about what Mark Seaton was doing with the SubMersive through the fast growing AVS Forum (link to AVS for a bit of nostalgia).  Since then the SubMersive has seen 4 upgrades over the years keeping it a top contender against the best subwoofers available.  Even more than a decade later the first pair of SubMersives in the linked AVS thread have been upgraded to our latest version of the SubMersive HP+ available here.  The SubMersive successfully demonstrated that it was both possible and desirable to offer low frequency extension to below 10Hz in room and dramatically higher dynamic capabilities.  You didn’t have to give up a concert kick drum if you wanted the room to shudder when depth charged on the screen.  The SubMersive has evolved into 2 variations and a highly refined subwoofer equally at home in the most impressive home theaters and complimenting exotic music systems.

Flat rate shipping of $125 each within the lower 48 states.

International customers please e-mail us with your shipping address and the number of units you are ordering for an accurate quote.  Shipping larger subwoofers internationally is largely determined by overall dimensions, so shipping two is often double the cost to ship a single unit.

In Stock orders have all parts on hand and will be assembled and shipped out within 5 days of ordering.

SKU: F18PA-2 Category:


The SubMersive HP+ is a high power subwoofer solution utilizing a pair of 15″ sealed woofers on opposite faces of the enclosure.  Each HP+ unit with its 4,000W amplifier can power not only its own pair of sealed 15″ woofers, but also and additional SubMersive HP-Slave unit.  In-room extension to below 10Hz is possible in the largest to the smallest of spaces.  Slave units can be placed separately from the HP+ unit such as one HP+ in the left front corner, and a connected HP-Slave unit in the front right corner, or units can be stacked for greater headroom from the same footprint.

SubMersive HP+ & HP-Slave
 Details and Specifications:

Amplifier & Controls:

  • 4000W continuous power amplifier (with slave connected)
    • 2400W continuous power as a single unit
    • Capable of driving our passive SubMersive HP-Slave to the same levels as a single HP+
    • 4 Conductor Neutrik SpeakON connection for powering optional slave unit
    • US designed, high current, high duty cycle, class D amplifier design
    • High efficency of up to 95% for maximum power from available home circuitry
    • Fully Manufactured in the USA (board level up)
    • Nominal 120V operation (HP i+/F2i+ version available for 208-240V operation)
    • IEC Power Cord (10′ length included) – right angle plug available
  • Connection options
    • 12V trigger and auto sensing – 3.5mm mini-cable connection
    • LED indicator for power, standby or error codes.
    • XLR -Female input (LFE/mono) with looping, XLR – Male output (internal Y connection)
    • 2 summed RCA inputs for LFE or Stereo inputs
  • Digitally programmable, detented, control knobs for precision adjustment and tuning
    • GAIN (volume) control – wide range for matching any system
    • LF Adjust (low shelf/adjust extension/room sizing) enabling adjustment of low frequency extension from 12Hz to 27Hz or +/- 8dB shelf (see graphs).
    • Low pass crossover 30-120Hz + 200Hz, precise, digital, Linkwitz-Riley 4th Order fitlers (24dB/oct)
    • Delay adjustment – 0-20ms for multiple subwoofer blending
  • Proprietary DSP performance optimization
    • Smooth anechoic/outdoor frequency response
    • Carefully optimized, proprietary overload protection – never fear for the well being of your subwoofer while the SubMersive maintains composure to much more intense playback levels
    • Smooth power response to 200Hz for seamless crossover with compact speakers
    • Shallow sealed roll off maintained in all LF Adjust settings
    • Shallow low frequency roll off typically yields 8-12Hz in-room extension
    • LF Adjust shelving & room size adjustment allow for a best fit with large to small rooms

Drivers & Design:

  • Dual opposed 15″ sealed subwoofer
  • Same acoustic performance as SubMersive F2+
  • Custom designed 15” woofer with 3” VC
  • Cast 12 spoke basket with large under spider venting
  • Kevlar-reinforced paper cone
  • Extended pole for lower distortion
  • Vented magnetic gap for low operational noise and thermal cooling
  • Made in USA


  • Common enclosure to ensure matching in driver output
  • Locally produced with custom-tooled lock mitered construction
    • Pre-veneered shell cut by high precision CNC router
    • Pre-veneered sheet is machined pressed for superior veneer adhesion
    • Lock mitered joints insure sharp edges and matched wood grain wrapping around the visible front, top, and rear.
    • 1.5” thick driver mounting baffles
    • Full windowed bracing with dual-opposed cabinet to eliminate enclosure vibration
    • Opposed force configuration of drivers insures zero walking or rocking of enclosure
    • Selection of available wood species and stain options
  • Magnetically secured grills with no pegs to break or see when the grills are off
  • Dimensions: 24.25″ W x 17.5″ D x 25.5″ H (Link to PDF) (including feet & grills)
  • Weight: 120 lbs
  • Shipping Dimensions: 28″ W x 22″ D x 30″ H, 130 lbs


Acoustic Details:

  • Internal 4000W/2400W amplification (with slave/indiviually)
  • Anechoic response:
    • +/-3dB from 19Hz to 200Hz outdoor response (LF Adjust @ 12 o’clock)
    • +/-3dB from 12Hz to 200Hz outdoor response (LF Adjust @ full clockwise)
    • +/-3dB from 27Hz to 200Hz outdoor response (LF Adjust @ full counter-clockwise)
  • 24dB/Octave CROSSOVER selectable from 30-120Hz and Bypass
  • 0-20ms DELAY adjustment for blending front/rear subwoofer sets
  • Typical in-room extension to 7-12Hz

Additional information

Weight 128 lbs
Dimensions 28 × 22 × 30 in
SubMersive HP+(powered) or HP-Slave

SubMersive HP+ with 4000W internal amplifier, SubMersive HP-Slave

Cabinet Veneer

Black Maple, Black Oak, Rosenut, Espresso Cherry, Vintage Cherry, Golden Cherry, Clear Maple, Red Cherry

5 reviews for SubMersive HP+ & HP-Slave Subwoofer

  1. admin

    Check out what John Johnson of Secrets of Home Theater & High Fidelity had to say about the previous version of our SubMersive HP+ subwoofer in his review found here (HPi+ is 230-240V capable with the same performance).

  2. W Jeff Meier

    I purchased a Seaton SubMersive HP+ for my home theater months ago. This product is crazy good along with the outstanding customer support.

    I have worked in thousands of home theaters, some of which have over $300,000+ in audio gear alone. I do not remember a system with bass more to my liking than what I have now. Kudos to Mark Seaton for this ground breaking product.

    The low distortion bass I experience is a wonder every time I sit down to watch a movie. Couple that with deep bass that does not want to shake my home apart.

    I wish I could award this product more stars, but five is the limit. I could not be happier.

  3. Sudheer

    Never had thought of subs could be so big with so good clean bass. Was setting up a new home theater system in my new ranch home and bought the HP+ and HP- based on a close friend’s suggestion who had 2 of these from previous version. Can’t thank enough to my friend and Mark for these 2 findings. Anyone looking for a good clean and rich bass and have a some money to spend, your search is over here. Go for it and you will thank me later.

    It is really that good. Besides showing off my friends with “Hotel California” song, it is a pleasure to watch great movies with good sound tracks, especially action movies.

    Thanks Mark once again

  4. Michael d

    I have had the SubMersive for, I don’t know at least 13 years. It is an out standing product. It handles everything I play. But it does it so well. The bass can shudder the walls or be very discrete. No matter if it’s a bass monster or not, it does not matter. It still sounds great. Plus on music it fills in the bottom so well. From Tool to the Allman Brothers, all music sounds great. And as I said before, movies sound awesome. I can easily recommend this sub. Since I bought it I am now at an original HP+ level with 2400 watts of fury.
    Did I say I really like this sub, because I do.

  5. Scott Harding

    In over 20 years of differing home theater configurations (starting with Dolby stereo) the Seaton Sub HP+ is still the cleanest, most powerful bass I’ve ever heard in my theater.

    I’ve run many of the big name subs using the sub crawl, room correction, and all the tricks reasonable for the room I have and the Seaton, now 6 years old, still well outperforms the others often costing more.

    Anyone concerned about whether or not Seaton subs are a good spend can lay their worries to rest.
    Keep up the excellent work guys!

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