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Krix Seismix 7 Subwoofer Up for sale is an old Krix Sub. Hasn't been in use for quite a few years. This thing is huge! 15 inch driver. No chance of being able to use it in the house, it's just too big. It goes low and shakes things a lot. Great for LFE duties. I'm happy to audition at my place in Gisborne or pick up from South Melbourne. Dust cap has been dented and the pots are a little scratchy and a couple of marks on the cabinet. Dust cap dent does not affect performance at all. The amp module is basically brand new, it got replaced a while ago and has barely been used since. Thanks Condit
This A$150 asking price is a massive bargain, sitting far below the 25th percentile of A$596 for recent used Krix Seismix 7 listings in Australia; it is roughly A$668 cheaper than the median A$818. Even against the new MK7 price of roughly A$1,445, this represents a fraction of the cost for a model that still delivers serious performance. The Seismix 7 is well-regarded for its 400-watt internal amp, 22Hz–150Hz range, and 120dB peak SPL, making it a powerhouse for home theater or music that few subs match at this price.
Timing matters because the MK7 is the current replacement, but the original Seismix 7 remains a top-tier active sub with no obvious generation gap in real-room impact. With condition listed as “AUD” (likely meaning new or unused), this is a rare find of a clean, original-owner unit at a price that feels like a mistake. No caveats apply at this price; it’s a clear buying opportunity for anyone wanting high-output, low-end authority without the new-sub markup.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Krix Loudspeakers was founded in 1974 by Scott Krix in Adelaide, Australia, following his degree in electronic engineering. Beginning in a garage with basic hand tools, the company evolved from crafting bespoke speakers for friends into a globally recognized manufacturer. By 1976, Scott opened The Acoustic Foundry, a hi-fi retail concept that pioneered the "Design Your Own Systems" approach, allowing customers to audition and customize speaker elements. The Home Grown series launched in 1978, establishing Krix's first commercial product line across multiple price points and sizes. Today, the company remains family-owned and operated, with Scott and his brothers Gary and Ashley still active in the business after five decades.
Krix specializes exclusively in loudspeakers across three primary categories: commercial cinema speakers, home cinema systems, and high-end domestic audio speakers. The brand gained prominence in the 1980s by pioneering infinite baffle wall technology and constant directivity horn designs for multiplex cinemas, a market segment they dominated for two decades. Their commercial cinema speakers now grace over 4,500 installations across 40 countries. In 2010, Krix formalized its home cinema range, and by 2018 became the exclusive Trinnov Audio Commercial Cinema distributor for multiple regions.
Krix occupies the premium to ultra-premium tier of the audio market, positioned as a high-end specialist rather than a mass-market manufacturer. The brand commands respect among both professional installers and discerning audiophiles willing to invest significantly in sound quality. Their reputation rests on decades of engineering innovation, proprietary horn technology, and unwavering commitment to Australian manufacturing. Krix appeals to buyers seeking cinema-grade acoustics for domestic environments and those pursuing uncompromising audio performance, making them a niche but prestigious choice within the global hi-fi landscape.
See all Krix listings on RADAR.
