So just before Christmas I received my Krix Seismix 3 MK7 and had the pleasure of listening to it over the christmas break and I can say there is a lot to like about this sub and so I have written my own review below which I hope helps people who are trying to make a buying decision on which subwoofers to go for, I have had the pleasure of owning other subs such as the SVS PB-1000, The Klipsch SPL-100, Krix Seismix 3 MK6 and the Paradigm Defiance V10, there are many more that I have owned, however I have written my comparison about these mentioned subs near the end of this review as they are within or near the same price range as the Seismix 3 MK7.
Design and Features:
For starters the New Krix Seismix 3 MK7 looks the same as the previous MK6, so the design has not changed as far as I can tell and even the specs on paper seem to be quite similar to the MK6. However there some changes and new additions to this sub, starting with the amplifier, where the MK6 gives you 300 watts rms and 600 watts peak, the MK7 now gives you a new amplifier that now outputs 350 watts rms and 700 watts peak so the power handling has gone up a bit and as well as that you also get wireless connectivity built into the sub itself, which allows for users to make use of the optional KS-700 wireless adapter which connects to the LFE/sub out on back of the av receiver or pre amp etc... and you can connect up to 4 seismix subwoofers on a single transmitter, which I think is fantastic and is a life saver for anyone who doesn't want to have too much additional wiring from the back of there av receiver or preamp etc... The other thing that has been changed is on the driver itself where according to the Krix website it says that the MK7 has "enhanced geometry within the magnet structure increases linear cone travel by a whopping 30 percent and allows superior driver control"(krix.com.au). So while the outside looks very familar from the previous MK6, a fair bit has changed on the internals with this new MK7.
My setup consists of 5.1.1ch Dolby Atmos/DTS-X Polk Signature series speaker system, with polk S20's as my main front, an S30 as for the centre and two pairs of the S10's for my surround channels and the Atmos/ DTS-X effects channels. All the speakers are running off a Yamaha RX-V1083 7.2 ch av receiver with a Sony UBP-X700 blu-ray player for movies and streaming content and a Harman/Kardon AVR 3000 which I use as my music playback amplifier (I use the same speakers in my system for both music and movies). After doing a subwoofer crawl I had the Seismix 3 MK7 sit on the left between the left main channel and the entertainment unit which actually turns out to be the most optimal spot for most of the previous subwoofers I've had. In terms of set-up, I had the subwoofer connected to the "LFE" input for the Yamaha avr (For anyone who doesn't know, connecting to LFE bypasses the sub's internal crossover which gives full crossover control to av receivers/processors), I had the sub's volume up to about 1 o'clock, and I had the phase set to about 180 degrees and 80hz on the crossover dial (using "line in" for the HK amplifier with the sub output level on the HK set to -2), as far as settings go on my Yamaha av reciever I had the sub level set at -1.5 and crossed my front 3 speakers at 80hz (small) and my surrounds/effects at 90hz (small).
I started off listening to the Seismix 3 MK7 with music where immidiately I noted that this is not like many ported subs that I've heard, in fact I didn't think that bass could be that clean from a ported subwoofer, listening to music "drums, drums, more drums" from Phil Collins (live at Montreux 2004) sounded great, the Seismix 3 MK7 played with great musicality and it was clean and tight, the Seismix 3 MK7's ability to start and stop notes was excellent, but that's not all, what really stood out to me though was when listening to Norah Jones's "Comes Love" was how well frequencies were separated, where some subs tend to create a one note wonder between double bass and drums, the Seismix 3 was able to keep separation of bass instruments, even at high volume the sub stayed clean and clear and I wasn't able to get the sub to jumble the bass notes. I can say so far that the changes that Krix has made to the MK7's driver has made improvements in the way it handles sound and overall for music the Seismix 3 MK7 sounded very tuneful. What about movies? Well I can say that the Seismix 3 MK7 provided very very solid LFE performance, playing the first scene from Toy Story 2 at loud levels gave the Seismix 3 MK7 a little work out and it was fun to listen to, I liked the way that all LFE notes didn't sound the same like some subs do with this very same scene, like when buzz is flying through the planet of emperor zurgs fortress buzz's jetpack didn't sound identical to when the ground beneath buzz opens up to the hidden tunnels which shows how this sub is pretty accurate. While it wouldn't go as low as say 20hz, I found this sub to still be a treat when it came to Kong Skull Island where in the scene the soldiers come to face Kong and all the choppers are flying towards him, the Seismix 3 MK7 made some really good impact from the sound of the chopper blades.I did play other movies like; Ready Player One, Pacific Rim, Transformers: Age of Extinction, Transformers: The Last Knight, Bumblebee, Edge of Tomorrow and Star Wars (most episodes) and all the while the Seismix 3 MK7 performed really well providing great impactful bass and I didn't feel or hear that the Seismix 3 MK7 was compressing, losing control, sounding unaturally boomy or bottoming out, overall it performed really well with my polk signature speakers.
SVS PB-1000 - This was the subwoofer I had prior to the Seismix 3 MK7 and even now I'd still say that it puts out tough competition against the Seismix 3 MK7. For the money the PB-1000 goes lower than the Seismix 3 MK7 with its ability to hit that 19hz mark and even 16hz in room, however while I do like the PB-1000 a lot for its LFE performance, I did find it a little bit boomy for my tastes, especially with music as I listened to it I found that it could use a bit more tunefulness and a little bit more separation between frequencies, but nonetheless I still like the PB-1000 a lot and if movies are a higher priority over music than the PB-1000 has quite the edge here, but if you want something more musical but at the same time want some very solid LFE performance with future proofed wireless capability then the Seimix 3 MK7 has you covered, on top of this the Seismix 3 MK7 is a lot more compact than the PB-1000, but to be honest its kind of a tie here and it comes down to the kind of sound you are looking.
Klipsch SPL-100 - Klipsch are not really the first brand that comes to mind when it come down to subwoofers, but have owned the SPL-100 I can tell that its decent enough, by decent I mean that when listening to it by itself it sounds good if not great, but when it comes down to comparing the SPL-100 with other subs like the Seismix 3 MK7, I find that there is some improvement needed. For instance I find the bass to be boomy most of the time which sounds like there is quite a bump somewhere in the 40hz region and at times it can sound like a one note wonder, this means I wouldn't recommend it for music at all, the other problem is the port noise, I usually pick up port noise quite easily and to be honest I find the SPL-100 pretty annoying with the amount of port noise it puts out which the Seismix 3 MK7 has none of, but even with the port noise and even with only 200 watts rms, the SPL-100 can go louder at 40hz and above than both the Seismix 3 MK7 and the PB-1000, it also looks good with that copper cone and has built in wireless capability like the Seismix 3, but other than that the overall performance win goes to Seismix 3 MK7.
Krix Seismix 3 MK6 - This was a subwoofer I had before the SVS PB-1000 and it was a great sub, it did music really well and did movies nicely, but at the time I had the MK6 I wanted to go for something that hit a little bit harder and that's where the PB-1000 came in and did better in that regard, but comparing the MK6 with the MK7 is where I found the improvements, the MK7 hits a little harder, is a bit more controlled at high volume levels, handles demanding movie scenes a bit better, has more power on tap to play with and wireless connectivity. So its a win for the Seismix 3 MK7.
Paradigm Defiance V10 - This is actually a very good subwoofer that I have had the pleasure of listening to, the sound is very nice, it goes quite deep and its musicial even when comparing the sound quality with the Seismix 3 MK7 I found them to be almost on par with each other, but here is where the V10 takes the win, while it only has 120 watts rms, its very efficient allowing the sub to output very loud levels. The V10 has room correction via Anthem's ARC which has always been the best room correction system I have used and it can improve the overall sound of the V10 even more. The V10 also has app control which allows users to control and make adjustments to the sub from there seat using a smart device. so all this taken into consideration, this goes to the paradigm.
For the time so far I've had the Seismix 3 MK7, I've got to say that its probably one of the best I've had in the price range, I can hardly fault this subwoofer, I can safely say that the improvements that have been made to this subwoofer have worked, and I can say that it has also improved a bit over the previous generation. I would highly recommend the Seismix 3 MK7 to anyone looking for great features followed by great sound quality, but at the same time want something compact. The only thing that I can see that's standing in the way of this subwoofer, is the amount competition in the same price range on the market right now.
> Clean, tight, well defined tuneful bass
> Very Solid Performance for "LFE"
> Lack of port noise
> Improved amp & driver
> Compact size
> Wireless Connectivity
> Not really much usable output near 20hz
> Tough Competition