Kharma Sub Set Up- Review


I’d like to share my experience with other Kharma owners regarding integration of the new Kharma subwoofer with main speakers. I use CRM-3.2FE as my main speakers and was very excited when Kharma finally introduced a sub. With that said, I also acknowledge that I have tried numerous REL products (Stentor III and (2) Stadium III’s)
on different occasions with mixed results at best. The REL products were used with other speakers (Wilson WP7’s and Maggie 3.6’s).

My room is a finished basement approx. 18x23x7’4” with carpet over concrete.

Like most of you have seen at the recent shows (or pictures from the shows), the general consensus is to place the sub between the left and right speaker when using a single sub. The Kharma manual also states that this is a good location to start with.I initially set the crossovers in accordance with my dealer’s recommendation which proved to be a good starting point. BTW, the Kharma sub is the most tunable/adjustable subwoofer that I’ve seen. My results with this set-up were in my opinion OK and by far the best integration I’ve ever achieved with a sub. Well, that was until …….yesterday.

I called a friend in the area whom some of you may know, “Romy the Cat” and asked if he could help me with set up. I’ve known Romy for some time and trust his skills in system set-up and pointing me in the right direction in my quest for audio perfection.

Romy visited yesterday with all the tools of the trade. These included professional spectral RTA, RT60 and phase meters. His comment when first listening to my setup
was the integration was “deplorable”. Volume 8-10 db too high, phase off, peaks and valleys in the frequency response. These comments were based on his “ears” and not the test equipment. He also said the sub will never be optimized between the speakers.

Well, I insisted we measure the sub with my setup and Romy all the test substantiated Romy’s initial findings. Frequency response had peaks and valleys to plus 12db at 25 db to minus 11 db at 63 and 80 HZ. We moved the subwoofer to the corner behind the left speaker and after much experimentation/testing (3 hours) found the flattest frequency response to be with the sub driver FACING the sidewall. The driver is literally 4-5 inches from the sidewall. Our final settings on the sub were to cross it over at 17HZ and 70 HZ. with a 12 db/octave slope. This produces a relatively flat response in my room from 20-120 HZ. The worst peak or valley being –3 db around 40 HZ.

So how does it sound…………..absolutely stunning. Whether I’m playing acoustic jazz, electronica, rock or classical the sub integrates seamlessly and plays every note with weight, depth and the proper harmonic structure while completely disappearing (ala 3.2’s).

Anyone considering the purchase of this sub should take the time and effort to properly set it up. You will be rewarded handsomely.
rcupka
sirspeedy: It was not my intention to question REL's performance or even try to draw a comparison to the Kharma sub. My experience with REL was well ovver 2 years ago.

The key point I'm trying to make is that subwoofer set up
requires careful attention to detail (positioning, phase, crossover slopes)and I highly doubt most audiophiles can accomplish this just by listening (I couldn't).
I heard the Kharma sub at CES and thought it was fantastic. Compared to the rest of the Kharma line, it seems like a bargain.
Rcupka, the point about subwoofer setup was a point I was trying to make in my response over at AA. The thing is that if you buy a REL sub from an authorized dealer, a trained salesman will help you with setup. And they have also developed a systematic setup process that is suppose to be easy to follow. I've had good experiences with REL subs in dealer showrooms so the idea of an easier setup could in the future become a deal breaker because I know I probably lack the tools and expertise to dial in my sub perfectly. Sometimes, it's only as good as the user's ability to use it.
I think RCupka understates significantly what is happening in his room right now.

Having been a real skeptic regarding what some call fart machines, or should I say subwoofers, and been exposed as well as owning a fair number of them in various systems have never heard anything integrate to my satisfaction with mains and sound cohesive. Anything, except perhaps statement speakers with bass towers like Genesis 200’s or Martin Logan Statements, which are not standard subwoofer type setups and are in a different price range than when we discuss “subwoofers”. This includes, yes, flying out to CES to hear the subs in a couple of setups including 3.2’s and Midi Exquisites with the Kharma sub.

What I heard from the Kharma sub before setup was perhaps the best sub that is super easy to integrate and setup and have good bass. At CES I felt that there could be a little more tweaking to phase and perhaps placement but that it was pretty good, but not great sounding. Certainly better than other professionally setup sub satellites except perhaps for one. I however sensed some directionality some phase and integration issues and told Bill Parrish this. Maybe spend some time and they could be good, or at least better, I didn’t know but all I can say is that after the experience I wasn’t real excited about the sub. I came back from CES and against my better judgement based on my past experiences and what I heard at the show and after asking a lot of knowledgeable people on this sight and my knowledgable dealer and Bill at GTT what their opinions were, I ordered the sub and simultaneously dreaded their arrival, mostly due to my ears being hugely sensitive to crossover points and the havoc the wreak. That's probably why I ended up with 3.2's since to my perception they are very seamless.

Anyways, having heard that the master of disaster had paid a visit to RCupkas, I straightaway paid a visit yesterday. Here is what I found:

When I got to RCupkas house, I had very low expectations as he has a basement room and many world class speakers he’s had in this room had sounded very flat dead and some even bad. It’s a tough room and I’ve heard his 3.2’s there and felt like there was no way any bass could ever integrate and wouldn’t even be needed as he was achieving the finest results I’d ever heard in the room with the little Kharmas. Any hesitation I felt evaporated with the first notes. As far as the bass goes, it's not just a matter of bass. The 3.2 is not added to but rather is completed by having the sub in the system. Totally seamless (to my perception) sound non directional, tight , powerful and defined as anything I've heard. There was one disc I put on Sonic Trance by Nicholas Payton and I thought I was hearing a drum with awesome bass fundamentals. It was actually a very highly tuned sharply played electric bass! It was that tight.

Also, where the recording places bass is where it ends up. I played Infected Mushroom BP Empire first track as an allout bass test and it literally energized to entire room where the bass seemed to originate from OUTSIDE the room, surrounding you with waves of controlled pressure that would literally shimmer all around you with tighter more defined bass and the 3.2's STILL exhibited their just razor sharp imaging. It was stunning and I had never heard that effect before, even from Alexandrias. Our pantlegs were flapping but there was zero bloat, just pressurized energy in the room that made us giggle like little schoolgirls.

Guitars, male vocals and horns had weight and mass that was just stunning. Stevie Ray Vaughns strat sounded like it was in the room with the woody body and awesome majestic power and presence of the real thing.

Pink Floyd cut from Burmester has a low level harmonic that is just lost on most systems. Completely captured by this setup.

When called for the low end was sledgehammer like. On Peter Gabriel's So it was the best I'd heard Tony Levin's bass stick, even better than in concert.

There were only 2 tracks where I even detected there was a sub in the room, Victor Wooten's bass on a Bela Fleck disc. He plays the uppermost range of his bass, then flies down the scale you do hear a slight transition to the sub at around 60 hz or so where the notes are not as tight and are more expansive and less defined. Perhaps it was the sub, perhaps the recording, I don’t know.

Just spectacular, truly transcendent. The magic of the 3.2’s is still there, in fact enhanced by the sub creating more weight to vocals and instruments to create more of the pulsing sphere effect of sound resonating in multiple directions with weight and body with subjectively a larger and deeper more natural soundstage. Was it perfect? I don’t know, is anything? Perhaps with 2 subs you could get more texturing in the bass, I’m not sure and don’t really care. I have heard better bass but it was in a very custom system tuned and built for a specific room with retail cost of $60k just for the bass part of the system. It textured more.

Again, is it perfect? I’m sure it’s not but shock and awe describes what I heard that day and you’re still faced with the limitations of the 3.2’s being small 2 ways. If you play your music much above 80-85db then I would say perhaps there are better speakers and setups if you’re into huge symphonic no dynamic compression type sound, get some 120db efficient horns. If you listen however at near reasonable levels the Kharmas are just taken to a new level. The magic of the 3.2’s is not interfered with, it's enhanced and completed.
I appreciate the comments and I believe the results obtained,in truly,good faith.What I do question,and this is just me,as I too would probably do exactly as you did and stay within the same component family,is the fact that Kharma,GTT or whomever (oh yeah,can't forget Mr.V of TAS)has done such a GREAT job of marketing their,admittedly fine stuff that "only an 8500.oo sub bass system" will do this job,to this level.As hobbyists, like good sheep, we thank the parties involved in the marketing for only charging 8500.00 bucks.This is what is driving the price of the better stuff up,on a continual level.The fact is that there are other fine candidates in sub-bass performance that would probably do just as good a job(I see no reason why the better REL's could not,or the Audiophysic)for less money,but,then we would not see the "latest color picture,or reviewers choice" in the "latest" magazine.Arthur Salvatore,we need more of you guys!!