Recommendations for a new subwoofer?

Oh, and an afterthought: if I end up with a sub that has speaker level outputs but not a speakon connection, what would you recommend for cables? Are there speaker cables that are more amenable low frequencies, or would any good cable do the job? Thanks.

I like Rythmik a lot. They have great sound. I have a Rel HT 1003mk2, great for the price. But something about the Rythmik I just love.  Rythmik was a bit more so maybe not fair. Nemo Propaganda has reviews of both and I like his opinions. So far he has been on the money with his descriptions. Look for sales and return policies of course in case you don't like the sound.

Someone recommended Mini Micro Subwoofer cable lead - Super-Shielded - Hum-Killer on ebay (link) which I liked as well, but I've used the premium monoprice cable, monster, and haven't noticed any differences. So I don't think you need to spend a lot on cables. IMHO as always. 

I'm using two REL 212/SX subs and I couldn't be happier.

It is not looking like much of a competition. That Elac is a true sub with an excellent driver, which will dig down to 18 hz, as stated, no problem. One of the supposed competitors with a -6db down at 27hz is a ’woofer’, not exactly a ’subwoofer’.

Besides...if you have a purist rig, no measurement tools, etc, that elac came with some unique tools in its app. You put that elac in a location. Run the 2 cal sweeps with its app, one right next to the driver and one at your listening position. It will show you exactly what it measured and how it corrected for your listening position.

If it shows a huge suckout, null, etc on the app’s measurement, move the sub around and run the sweeps again, i.e., it gave you a integration tool that’s user friendly even for guys who may know not know anything about subs or room acoustics. Your chances of success could be much higher. Subs won’t magically integrate without availability and usage of the right tools...despite what the marketing said.

Ideally, you should lop your 2-way bookshelf speakers off on the low end around 100 hz or so with ’bass management’ (probably even up to 120hz with dual subs, depending on the room and not localize anything), i.e. prevent that speaker’s woofers from moving too much and pass anything below to the sub. If it moved too much, it will screw everything up at the upper octaves. In your case, it is tasked to handle everything upto 2000hz before some tweeter took over, i.e., it has a lot on its plate. So, you should be a good samaritan and lend it a helping hand. If you can eventually get your hands on something like a Yamaha R-N2000A, R-N1000A, R-N800A, etc amp with such features, it should do the job.

Hi OP

l would stick with Rel as you are there already to go with the dialling in with your pre use qualifications. No need for apps, just a good pair of ears.

Go for a T7i or T9i second hand. Both have 10” drivers, the higher the number the greater the amplifier power. No point in paying for a new X model in those sizes, there was no discernible difference to my ears. You may find a stereo pair would fit in your budget if used ones are abundant. They both have high level Speakon and low level RCA inputs. Rel developed this first and l advise you do not accept other brands that do not offer this. High level for Stereo and low level for those extra channels for home theatre…..it’s a no brainier with total flexibility. Rel may only go down to 30 Hz but l never found this a problem, my neighbours yes. Also don’t go for extra large drivers as your bass can end up boomy and bloomy. Smaller drivers are quicker and slicker.

l use two Rel T9i subs and as a guide, l bought second hand for £650 and £550 (roughly $1500) in the UK. One would be enough but two for me are best as you don’t have to drive a single sub so hard. Less chance of a bake off frying incident. You will take a risk of course with no warranty, but the choice is yours.

@cooper52 a good subwoofer cable will do the job. And no do not get a REL. They work but they're grossly priced for the performance you get

Also subwoofer doesn'magically work in a room so a bass management app is ideal. cos room modes are non negotiable. Physics can't be cheated.

Get this sub - S1512M – Power Sound Audio

Might be able to pick up a used S/510 within your budget. You’d be hard pressed to find a better sub at that size and price. 
 

And no do not get a REL. They work but they're grossly priced for the performance you get

That’s the complete opposite of my experience.

Modes, Nodes and Anti-nodes (sounds like something out of Star Trek)

A well known fact…… A stereo pair of subs actively reduce extreme room modes (and within my own experiences).  The sound waves emanate from different areas and bass dispersion is more uniform. Of course there are people with multiple subs, and stacked subs which are an altogether different room experiment.

I can heartily recommend SVS as a sub source. I have a pair of PC2000 subs that are surprisingly good and will in the right room give performance well below 20 Hz

https://youtube.com/MendItMark would have fixed it.

he informed me that one of the boards was fried

+1 REL

I checked out all the usual popular choices before making my “A” system selection.  
 

My decision tree matrix : 

(1) We have all had our fair share of bad subwoofer experiences,.There is a kind of snobbery that exists in our world of high-end audio aimed primarily at receivers, car audio, home theater and subwoofers. Poor selection of subwoofers are responsible for many people disliking them since it is the subwoofer in these situations that tends to call attention to the system and cause many of the problems. The truth of the matter is that many subwoofers have fully earned their bad reputation in 2-channel audio …Most of them sound boomy, muddy and out of control with an obnoxious bass overhang that lingers so long as to blur most of the musical information up until the next bass note is struck.

Because everything in this hobby is built to its pricepoint, it faced the tension of finding premium performance Versus budget = a $3K - max $5K audition strata .

(2) As anyone who’s fiddled with subs knows, setup is at least half the battle when it comes to getting the most out of a subwoofer 2-channel system, and I can honestly say that good set-ups are a long-time labor of love. 

(3) Best of breed build with best of breed components, and premium warranty terms.

(4) Ethereal WAF with superior visual appearances , ergo choice of all-wood finish materials.

(5);a $5000 budget ceiling price-point.

My Take: ATC  C1 Sub Mk2 active subwoofer bested all contenders and pretenders with HARBETHs in my system. 

- Superior build components, premium all wood custom finish, a full 6- year OEM warranty, and it’s a down firing unit that somehow made its unit room placement easier,

- Highly recommended for an audition.

Review: 

https://www.theabsolutesound.com/articles/atc-loudspeaker-technology-launches-c1-sub-mk2-active-subwoofer/

https://www.hifipig.com/atc-launches-new-c1-sub-mk-2-active-subwoofer/

Subs should be seen and not heard.

In other words……

1.  You can see the sub or subs (unless hidden behind furniture or out of sight)

2.  From the sub or subs, no attention sound wise should be apparent. (No sound appears to emanate from them)

If your sub-bass does not integrate and appear to be coming from your speakers and spatially within the musical performance then:-

       A. Your sub or subs are rubbish.

                               OR

       B. You have not set up correctly.

Subs should not attract musical attention to themselves. They should be fundamentally “seen, but NOT heard”

Magic happens if subs can become invisible as well. That for me truly demonstrates everything’s optimal and set up correctly.

I got some very good advice once.  If you want the best sub, buy if form a company that only makes subs.  This should shorten up your list.  Good luck and cheers. 

Parts express makes a plate amp you could bolt on the back of you old sub as long as you put an ohm meter on the speaker and make sure it is ok. Enjoy the search.

+1 for Rhythmic Subwoofers.   I demoed the REL 812 and found the Rhythmic E15HP2-SE to be far superior and less that half the price.   I bought a pair…   The Rhythmic are deep to the point of inaudibility, very articulate (you can hear and feel the string vibrations on electric bass), and exceptionally fast (they pair very well with electrostatics).   And when well setup, you really don’t “hear” them, but turn them off and the soundstage collapses.

And speaking of Rythmik (correct spelling ) Audio and electrostats: for those who want the ultimate sub/dipole combo, check out the dipole/open baffle woofer/sub that Brian Ding created in collaboration with Danny Richie of GR Research. Add that sub to your dipole loudspeakers (including any and all planars) for full range reproduction down to 20Hz. The only sub of it’s type (open baffle, dipole, servo-feedback controlled woofers) available.

Many thanks to all for your suggestions and advice. Unfortunately, in my setup, I only have room for a single sub, and my late, lamented REL S/2 filled the bill admirably. While I’m intrigued by the Rythmik subs, there seems to be an availability problem at the moment and, reading through the info on their website, they don’t recommend speaker-level connections for their subs, but right now, it’s my only option. Nevertheless, the F12 looks like it would be a logical choice for my system. Otherwise, I can see the upsides of the Elac, and I’m very tempted to go that direction despite the fact that it relies on an app. And ATC, as good as it may be, is outside my budget. 

Also, I did some online poking around about bass management but couldn’t find any useful information about how I might incorporate that into the system I currently have, and I’m in no mood to jettison my Modwright amp on that account. This is probably a totally different thread anyway, and I might post that question separately. 

Still haven’t ruled out a new REL, just have to settle on which one if I decide to go that direction. 

And a little postscript here, since it's too late to edit my original post: I mean speaker level INPUTS, not outputs. Oops. 

Speaker level inputs, not outputs. Oops

I think we all got that as a typo. 
Your observational reference about the general absence of line inputs…..

It constantly amazes me that hi level inputs are not offered as an industry standard on all decently priced (up market) subs. Why cut corners?  Maybe a deliberate marketing ploy by those manufacturers for a more customer perceived competitive retail price point versus the ones that do offer line inputs.  Hmmm

Well done Rel for taking the guess work out of it and offering line inputs AS STANDARD.

Footnote

Just to avoid any confusion, Myself and the OP are talking about high level SpeakOn (Nuetrik) speaker level line inputs.

Nuetrik connectors are regarded by professionals as the recording industries highest standard, for their robust construction and connective integrity.

@cooper52: Though Rythmik designer/owner Brian Ding prefers and recommends line-level connections, he offers his subs with a choice of plate amps that provide both high-level (power amp) and line-level (pre-amp) connections. My attitude on that subject is: Why add the distortion inherent in all power amps to the signal you send to your subwoofer amp? So that your sub suffers from the same imperfections as do your loudspeakers (the distortion of the loudspeaker’s power amp introduced into the reproductive chain)? Imo that’s a questionable approach, especially with a tube power amp.

I say, go ahead and get that T/9X. I might even got with a T/7X. I'm a fan of smaller subs for music. You can never go wrong with a REL. They seem much more musical and easy for blend with your speakers than a lot of other subs. Other subs may have more power and can go lower, but that doesn't make them sound better, at least not to me. Whatever you decide, enjoy your purchase and enjoy the opportunity to audition some new stuff. 

@cooper52: 1. "what would be a suitable replacement for that sub?" 2. "despite my previous experience with REL, is that it doesn’t rely on an app to get it dialed in to my system," 3. "Whatever sub I wind up with will have to have speaker-level outputs, because my integrated (ModWright KWI 200) doesn’t have a sub-appropriate input." 4."if I end up with a sub that has speaker level outputs but not a speakon connection, what would you recommend for cables?" 

1. As @deep_333 described, despite their use of the word subwoofer REL only manufactures Sub-Bass Systems (-6dB add on woofers).

From REL’s brochure "REL subwoofers (I still like our original term Sub Bass System for its more complete description of what we do)"

If you or any of the others here recommending sub-bass systems had the opportunity to experience an in home direct comparison between an actual -3dB subwoofer and a sub-bass woofer, the ability for the subwoofer to reveal the subtle recorded extra low frequency would be undeniably apparent. 

2. Since -6dB systems so dramatically roll off low frequencies their stated low frequency is only faintly audible regardless of how many units are used. Consequently they simply do not excite a rooms standing wave bass modes requiring only a gain adjustment at the expense of the recorded low frequency presentation.

3. & 4.Your ModWright KWI 200 is equipped with a pair of RCA Preamp outputs which you would use to connect to a subwoofer input. Blue Jeans or Monoprice Cable offer affordable custom length and type of subwoofer cable.

The recording industry more appropriately uses XLR termination interconnects. Not to be confused with the pro audio public address industries use of Neutrik Speakon termination at both ends between amplification and speakers. Always consult your amplifier manufacture (not REL) regarding REL’s three wire connectivity scheme to their amplifiers.

If you decide on an actual -3dB subwoofer I suggest its imperative to first preform the subwoofer crawl to locate your rooms standing wave bass modes for to proper subwoofer location options where the subwoofer will best integrate with the room, requiring the least amount of EQ adjustments followed by any further speaker integration adjustments. 

Good luck with your search.

@mcraghead Go ahead and get that Rel T9x

At last the side of reason……

But others will say, joining the side of reason….. is not always a good reason.

@m-db 

Great advice there and overall analysis and choices to consider.

Rel recommend the bass crawl you describe. It is in their set up manual. They even suggest an actual CD track (from James Horners “Sneakers” Soundtrack) for a constant repetitive bass drum strike lasting several minutes, to find the best location.

Quite by chance l had it…….. l collect film soundtracks... Simples!

I started with a Rel Quake 20 years ago….added a second. Graduated to a T7 after one Quake failed after 15 years. So impressed with the T7 l bought a T9i. I have now sold on the T7 and bought a second T9i and now run a stereo pair.

l would have no problems recommending this company to friends or family. Rel only make subs…. It’s what they do.