Official Rythmik Audio Subwoofer thread - Page 272

Well glad it's not just me. I think it's trying to play much too low frequency with too much volume.

hey guys thinking of buying a fv15 hp. i currently have a rw12 and a denon 4520 will the two work well together or ditch the rw12

Dump it no doubt.

thanks lol will do

FYI: The link to the installation guide - http://www.rythmikaudio.com/download/LV12R_Installation_Guide.pdf - brings up a "page not found" error.

Awesome! Brian since I am local I will give you a call to coordinate a good time to stop by your shop and pick one of these up.

Thanks everybody for your help to date. I just ordered an F12. It should be here on Monday. Can't wait to get the 8 year old Sony (10"/100W) sub out of my recently upgraded (Onkyo 605/Klipsch Quintet to Marantz SR5007/Klipsch Reference Series) system. I'm like a little kid waiting for Christmas to get here

Congrats on the purchase. I love new toys. Please check back in and let us know what you think.

Brian,

I have been waiting for this model to show up. Please post the pics of the final product here, so that I can make a decision to place an order. I will PM you with schematics of my room, and would appreciate your advice regarding placement. Thanks, and congrats on reaching shipment stage!

I'm not glad it's not just me... now I think we're both having problems Everything I read about this sub tells me it should handle that song with ease. Brian sent me some test discs that I should finally get a chance to use this weekend.

Has there been anymore updates on the latest up coming version of the F25?

That's great. I think everyone here loves that feeling too! Part of the reason why we're never finished upgrading

I have a 7 speaker Klipsch reference setup mated to my E15 and it sounds fantastic! You're going to be very pleased with the Rythmik! My E15 actually had a faulty amp (probably shipping damage), but Brian was on top of it, and he sent me a replacement amp which fixed me up. That guy takes great care of his customers.

I keep meaning to find the song and play it. But just FYI it was part of the demo at the get together in PA last fall and my FV15HP played it in that configuration with flying colors.

OK I just realized the track is on you tube so I played it through my BR's you tube app. Took the grills off to watch cone movement, played in stereo at -20, then -10. My subs are 3db hot. 14hz ext, Hi Damp, Line in cuz I thought I'd need phase but haven't touched it yet, AVR/12, 1-Port, Rumble off, Limiter On, power auto. I need to switch from line in to LFE and I found my minidsp so may start using that soon when I find some time to tweak. I found a post claiming the notes in that song are "36hz, 34hz, 33hz, 31hz, 17hz, and 7hz".

This track may be in need of a high pass filter which I may add with the minidsp.

I did not get bottoming out but there is that one repetitive inaudible 7Hz note that causes A LOT of cone movement. Right before the notes that hit hard/are audible. It happens a bit more extended then the repetitive note right after the quiet section about half way through and right at the end also. Frankly I was really impressed, but that super deep note is kinda scary. However it causes a lot of air moving around. I do feel it, just can't hear it, and I've got some room rattles that need to be addressed that were enjoying dancing to the song.

What's going on is that 7Hz note is below the port tune (14Hz) where the woofer no longer gets the pressure support from the box and begins flapping fairly uncontrolled (can someone provide the more technical explanation). That's when a ported design can bottom out and you begin to get in danger of port noise. I did not get any port noise at -10 with subs +3db hot, but I think if I kept going higher it could happen. It's just the nature of ported design and not a product specific issue. You get more output with the ported, but it has it's drawbacks too. I prefer the tactile ported nature and am going to experiment with a pretty steep high pass around 10 or 14 Hz.

Can't say whether your subs are having an issue but this definitely verified mine (one built last august, one built in December) are functioning properly.
Edited by dstew100 - 2/1/13 at 10:41am

Mine is a sealed F15 though.

That's really good to hear. I got that idea from other posts. Having problems isn't an issue, things happen. It's how you take care of them that matters. Now if it just wouldn't take 4 days to make the 7 1/2 hour trip from Austin ..... This is going to be a long weekend!

18000 watts on 10 15 inch woofers in a Honda civic impresses team Bass I Love You. How come Rythimk does not roll like that? Brian please don't answer.

Another thought on this... If the ported caused cone huge excursion 7Hz note was prevented. Think how loud I'd be happy to crank it... If I liked the song for anything other than a hardware test. Cut the 7Hz I do not hear, and I could take that song up to some very high levels comfortably.

EDIT: What I really mean is the sub is working so hard to play a note which is inaudible. Cut it off and you can play the rest loud, or apply many woofers and power to play the subsonic to an adequate level (should be sealed or LLT for dat). 14Hz tune is very deep IMO, but you have to work within those bounds if that is where your system is at.
Edited by dstew100 - 2/1/13 at 10:56pm

Are any of your subs, dual driver?

TIA

I don't particularly have any desire to listen to "Bass I Love You" outside of testing purposes, but I'm having a much different experience playing the track than dstew100. I understand 7Hz is inaudible, but what's not inaudible is the noise coming from my sub bottoming out (not sure if that's the correct term -- it sounds like the driver flapping loudly against itself or really loud farting noises -- is that what port chuffing sounds like?). I can hear the noise clearly above the rest of the track at -20. It sounds awful and scared my dogs

I don't expect my FV15HP to go down to 7Hz, but shouldn't it simply not reproduce those notes instead of bottoming out at moderate volumes? I freely admit that I do not understand much of the science behind what goes into a subwoofer and how low notes are reproduced, but what happens if I listen to a movie with a 10Hz scene? Shouldn't I just miss out on that part and not have my movie experience interrupted by something that sounds like my sub is about to explode (in a bad way )? It happened again (I think) watching the movie "Beasts of the Southern Wild" -- which for a non-action film, surprisingly has some pretty nice LFE.

Please don't take my post the wrong way -- I think Brian and Rythmik are fantastic -- I'm just trying to figure out if I have a problem with my sub or if it's a problem with my setup or expectations of what the sub can/cannot do.

Woody777, I'm not the most technical on this stuff either but keep trying to learn more and more. This stuff is kewl.

I believe "bottoming out" is when the cone excursion is so much that the woofer physically hits the magnet. This is very likely to cause damage so until Brian comes up with some tests and/or recommendations for you I would cease that particular test.

I believe "port noise" can occur when playing below port tune where all of the sonic energy comes out of the port from the woofers backwave and is not coming directly out of the woofer itself. I think there's a point where so much air getting pushed through the port causes a "chuffing" sound.

So I think bottoming out is a physical "knock", cone hitting the magnet. Whereas port noise is caused by too much air and sounds like a "chuff".

Do you think your source volume could be vastly different from mine, can you play from you tube? I am calibrated to reference. I noticed we do have some configuration differences, not sure if that could be the cause of our different results. The limiter makes sound strangisms when it kicks in but the only time I have ever heard it was playing a long slow sweep starting at 5 Hz and the level was CRANKED at the GTG. The limiter kicks in so big SPL drop, then releases, then kicks in...sort of like pumping the breaks so SPL fluctuates. Any particular reason why you have this safeguard off? It may be worth a try to match my settings but start very low volume and stop at any sign of trouble. During that sweep I sure was glad I had it on.

How does your sub sound on material above 14Hz? I suppose another test would be to do some sine waves. They are very taxing on a sub so play short tones (maybe 15 seconds) and give the sub a break between (maybe a minute or two). I'd be curious how the sub performs in gradually decreasing sine waves from 30Hz down to 16Hz (also ceasing at any sign of trouble).

Clearly our subs are performing differently on that track and I too am curious as to the cause, I suppose it could be configuration but really I dunno????????????????

The voice coil former hits the backplate, to be exact.
Port noise is caused by the friction of the air vibrating in the port. If the driver is being pushed too hard or at too low a frequency, or both, the velocity of the air in the port is high enough so that friction causes audible noise. The situation is exacerbated if the port area is too small, as that causes the velocity of the air in the port to be higher for a given volume of air, per Bernoulli's Principle.

There is an F25 model which is due out soon, not sure when but before summer if I recall correctly. It is pictured on the Rythmik website. I believe it is a sealed dual 15" w/800 watt amp + servo. It should have more extension and output then the FV15HP.

tytytyty

Thanks. I've seen the posted image of the F25. Looks much like the SubMersive F2 but not with as much amplification. I wanted to make sure I hadn't missed anything.