I might be interested in someone selling these locally but wanted to query any owners on how they are hooked to any Decware amp.  I have had no luck finding an owner's manual.  In looking at the photos, there is a high level and low level input/ouput.  Which is better?  And what is the difference?
Bob

Will is 100% correct in that his description is the best way to go.

But we have not yet answered the "difference" question you asked.

The difference between the two approaches is hard to explain without using a lot of words.  As briefly as possible ...

Understand that using the Low Level from your source to your subwoofer amplifier and a second Low Level connection from your source to your main amplifier, in effect, seperates your subwoofer amplifier from your main amplifier, leaving each on its own, making it more difficult for them to work together in many cases.

Using the Low Level only from your source to your main amplifier, then the speaker output from your main amplifier to your subwoofer amplifier High Level input ties the two together in a way that makes it easier to integrate the two systems into one coherent system.

I hope that helps with the second  "difference"  question.

The way Will describes it is the way it works best.

Let us know how the Omega subwoofers work out.

So, did you buy these?
Do you have them up and running?

Congratulations Kulafu. I have looked into those. They get nice reviews. I hope you enjoy.
I’m glad you asked this question. I had the same question and currently have Upscale Audio looking into it for me. My other concern is the Dual Mono aspect of some Decware amps, like the mk5 I ordered. I’m not sure you can use the speaker posts in this case, which Upscale suggest like members mentioned above. It can also limit the numbers of subs used. I may be only able to use the mono out on the csp3 as my sub out, limiting me to one sub.
Don’t mean to hijack thread. Am currently researching the Rel s/510.

Thanks Will. I know using 2 isn’t an issue, just not sure of the one. Rel will get back to me Tuesday. I always had a sub with smaller 2 way speakers, 25 years actually. Now, with the Zu Soul Supremes I thought I may be able to live without one. Apparently they have a very A shaped sound curve and the bass is there but in the periphery. Research has revealed that 2 subs is recommended in most cases.
At the price of the Rel s/510, I’m not doing 2. But, I could do 2 t/9x’s instead. I’m sure they are many levels above the Velodyne I used for 25 years. The more reviews one reads the more you want the next level up, s/510. Faster, cleaner, etc….
I did look at the svs subs as well. Read nice things. I’m looking at Rel due to good reviews like the SVS but also the shop I deal with carries them.
I also have read that a sub has an affect on the mid range. That was a factor for me starting to think about a sub again. The Zu’s are quite forward in the mid range and a couple of well known You Tube reviewers that like Zu, both state that subs really balance the sound. It certainly could be an auditory thing but it’s been mentioned that it could be changing the output of the mid and high. I guess it doesn’t really matter how if it sounds “better”.
Keep us posted how you make out with the SVS experiment.

I was looking to get a MJ Acoustics small sub on a freind's recommendation who has always been extraordinarily right for me. He has used the smaller MJ subs in many high-tone systems and rooms, and helped others tune theirs in other very nice system/rooms. He said that with this pretty musical sub, and the fine tuning ability from the seat, integration can be really good with a single sub. Also he said that this ability to seriously tune can even make it work in locations that could be unacceptable for subs that have less fine adjustability.

But having good bass already, and MJs having gotten fairly costly, and a bigger risk coming from England if they did not suit me, I was waffling on that decision so long it got ridiculous.... like several years as prices rose.

So recently I looked into the smaller SVS's having similar software tuning tools and by some reports being tuned better for music after some years of being considered by some to be a pretty good go to sub for movies, but not quite as good for music. So I decided to check it out, figuring the main risk was time since it could be returned for free. But after the initial listening seemed promising, I did have to make up some half decent signal cables, and a power cable for it.

Conceptually I am finding similar integration with this single SVS as my buddy's reports of the MJs, though I don't think it would work the way I have it if I was really wanting to crank the bass. Having the sub off to the side of one speaker, not centered, when set higher it can sound good with some recordings, but gets disjointed and overwhelming with seriously low bass mixes. So I set it to make those sound natural and unaffected.

At the "just there" levels I prefer over the range of recordings, it supports/refines the speaker bass with a single sub and can get fully invisible on most recordings, and as tuning skills seem to improve, lately it seems good on about all recordings I am randomly playing... So closer and closer, and tuned just so, I hope/think I am finding a set of adjustments that power up the bass some with decent speed and tone on sorry recordings, and a nice deep/solid/fast/natural bass with better recordings.

That said I can certainly imagine that two well placed could be easier than one, both for balance and filling the room more if needed. Here I have been keeping that idea in my back pocket, but not a lot of space left for it, so I am still hoping to get one to work.

I can relate to how a low low pass helps with just one sub DD. I was preferring pretty low frequency low passes for quite a while with a high dB slope, like 34-37 Hz and a 18-24 dB slope. But I really like my mids, so do not want to particularly flavor them with more bass rising into the mids. Also, all the salesman talk of filling the room with a big sub or two makes sense to me for really big, room filling bass with say movies. But in my 5000+ cu ft space, I am currently running this sub at -28 dB to get it right for bassier mixes, while not overloading the room with thickness or muddle. So it seems I have loads of headroom with the way I prefer this little sub sound.

But  recently, after getting the phase, volume, polarity, parametric EQs, as well as very low frequency rolloff frequency and slope more right for this space (they call the low cutoff EQ "room gain compensation"), I am beginning to like a mid 70s low pass better, and a 24 dB slope at this higher frequency is even more important for my needs to not color the mids, and to work across recordings. I like 76 HZ right now but we''ll see.

Earth, I suspect you can likely easily warm up/fill out the mids with RELs. With the SVS they had several preprogrammed setups with different EQs and other settings. And one I sort of liked for filling in the mids with a nice touch of fuller warming up in the mids was the "Music" setting. It has no low pass frequency setting. So presumably it is running full range for the sub, which is spec'ed at 20-270 Hz +/- 3 dB, so a fair bit of mid bass support. At this setting, it does integrate pretty well in this room with the phase, polarity, and volume set well, while shifting the bass tones more into the mids... just not quite what I am after.

It is a trip!

For speaker level sub setup, I am thinking of the sub as a support for the speakers/room, not a replacement for part of the signal. But I have been setting a max sub bass frequency and slope like a crossover sound-wise, trying to use the low end focus of a sub to support where the speakers can’t do it as well as the sub in my setting. My speakers/room go low but lose some articulation way down. So not a crossover circuit like some sub crossover setups where you run speaker cables to the sub first, through its adjustable crossover, and then wire what is left to the speakers from the sub... the sub doing the lowest stuff, and the speakers having those frequencies attenuated to whatever level by the crossover. Whereas, the speakers and sub getting the same signal, hopefully the sub can supplement the speaker’s low down weaknesses with musical integration.

Not having tried RELs I can't begin to suggest this SVS might be a better path than RELs, even with very fine adjustability from the seat. It seems REL's popularity for being fast and musical, and pretty easy to integrate is relatively common... what I have read or heard from others anyway. Though without two, can they be integrated as well without fine adjustments and in placements that might be a little suboptimal...don't know.

And I know how particular I am about balances, so the idea of very fine adjustments through phone/pad software appealed to me. My hope was that they would allow me to tune it as best as possible to my preferred system sound while adding a bit of refinement. But this too is theoretical, not having tried a REL.

I use an iPhone for the SVS app. The software can seem a little odd in some design parameters, but to me it is nicely done, pretty advanced and pretty easy to navigate. It has pages for:

Volume: 0 to -60dB
Low Pass Filter: 30-200Hz with a slope of either 6, 12, 18, or 24dB per octave (also with on/off button for testing)
Phase: 1 degree increments 0 to 180°
Polarity
Parametric EQ: 3 Simultaneous Curves, individually having on and off buttons.  
Room Gain Compensation: 25, 31, 40Hz with 6 or 12dB per octave slope.
Presets: 3 Factory presets that can be used as is with volume adjustments for simple integration. Or these can be adjusted with whatever user adjustments one wants beyond volume and saved as user presets. Or make up your own altogether, and save them with as many of the advanced settings as you want to use. Having user presets has been useful for comparisons of similar home-made preset settings and testing variations in an AB way.

I prefer to do it by sound. But I have been tuning with EQ for years, mostly pretty subtle, but enhancing room balancing EQ, and all by ear. At some point I got a mic and long USB cable I could use with REW, but never went there, so many serious listeners finding these methods unnatural sounding for their tastes. I can imagine this could be less the case with bass, but not sure, and guessing you can still fine tune "adjustments from measurements" to taste, but I have not explored this.

In contrast, I am really particular, and I have always liked carefully tuned by-sound EQ for refined system/room adjustments, to me making the music more beautiful and system more versatile. Though it may not be totally “flat,” by engineering standards, if close to balanced, I am thinking it can be better than the hypothetical “flat,” more alive and complex, more like real music. So I stick with it, slowly refining my discernment as a result I hope!

And being green in this sub world, I can’t be conclusive about how to best tune this one, but here is where I am so far.

I guess every system and room tuned optimally will end with different settings, but for me the main players seem to be volume, low pass frequency and slope, phase, and perhaps the room gain compensation and slope. I find them totally interrelated, changing one effecting the sound of changing the others. I am liking it best if I go for a tight/fast bass mainly, so timing/phase and volume adjustments at first, in my case starting with the default 80 Hz with a 12dB slope for low pass. And then I set the low pass and slope to sound "right" in terms of natural sounding bass spectral balances across recordings, hopefully with little emphasis on any part of the bass, and nothing missing on average considering the flaws of various recording styles.

Then, here, though it sounds good with no room gain compensation, so far I find it more versatile across recordings with it on 25 or 31 Hz. And the polarity is similar for me, finding it a little more natural/rich sounding without it, but perhaps more versatile and clean bass settings in this room with it on. Finally, the parametric EQs can be refining, using the same sound parameters, to tighten bass by lowering room mode zones that muddle the sound, or raising ones that might fill around cancelation frequencies, or just make the bass feel more impactful and natural. Here, either up or down in the right areas can be useful for clarifying a natural bass feel.

So I am going for a complete sounding bass that balances low to mid-bass within this system/room, so that, as much as possible, it sounds like a real bass or drum, or whatever. Fast, not too low and not too full, balanced so that I hear as much natural sounding bass complexity as I can with as little smearing or muddle as possible.... bass that is not overstated in the deepest mixes, and set so it does not overwhelm mid clarity or get thick or boomy across recordings. At the same time, I am listening for settings that feel like they open/richen the mids... to me indicating good bass settings with decent quality sub support can improve bass timing that can help balance system/room smearing issues.

It has taken me some experimenting to figure out the sweeter zones for each of these settings (still playing some), while gradually refining  balancing them together to sound "right" with more intense heavy bass recordings as well as improving bass on more sorry bass recordings like many earlier jazz recordings. A good seeming crosscheck for me so far: when I think it is all pretty good, I crank up the sub volume some and play some heavy bass recordings to see just how close I got with the bass pushed too much. Then I make minor adjustments if I hear some smear, masking, or heaviness, etc, and then go back to the more proven system appropriate volume. Still working it, and hoping I can "get there" for my needs without having to move into trial and error with different subs, or by deciding to do without as I have been for a really long time.

All that said, seems folks find some subs can be pretty good with well designed default settings, and simpler adjustments, but I really like tuning tools based in this early stage of exploring subs again.

Hope this helps.

Will

Yes fun coming, and who knows, whatever you end up with, maybe a sub will not be needed???

Great to hear. Congratulations! Give us some further impressions when you get them situated they way you like.