Good idea tvuong! If you guys are interested in doing this, then read on
If not, then that's ok too.
is an awesome tool to show what's going on with your TR as far as balance across the board as well as the intensity. I see no reason at all that it would not work well to compare these subs in another way in addition for TR. VibSensor for the objective part of the comparison to compliment the subjective when it comes to Tactile Response
That said, even if the TR results come in very close looking, they could still possibly feel a bit different, but probably not by much. The VS doesn't lie when it comes to Low Frequency Tactile Response at the seat, and shows pretty much exactly what's going on with your TR at the MLP in how much shake it's getting at all the frequencies.
You can use any material you want to run the VS measurements on (specific time stamps from movies, White Noise, Etc).
To start with though, I wound think the best would be White Noise 0-50hz. This would show the TR very well between the two across the board in LF and ULF area. Well at least it will from about 10hz to 50hz. The VibSenor has never shown under 10hz well at all and just drops off like a cliff, even if there is a good bit of under 10hz TR going on. No big deal though, as down to 10hz is good and right around these subs port tune.
To give you an example of what a VS graph looks like with the White Noise 0-50hz, I ran it on my system right quick this morning with my Subs Only (no TT in the mix). I ran it at -10 MV (Master Volume) since this is about the loudest I ever listen to movies and also my normal sub trim bump of about 10db (so about where you guys did your comparisons at IIRC). Or maybe you guys did them at -5db. Either way is fine. Anyways, the settings I used puts the bass right around reference or thereabouts down to 10hz and under.
So what does all that show?
Easy ....along the bottom of the graph shows the Frequency 0-50hz. It labeled across 10hz increments (i.e 10hz, 20hz, 30hz moving left to right). Then on the right hand side of the graph, it shows the intensity. The higher it climbs, the higher the intensity. They are labeled 1e-04, 1e-03, 1e-02 and so on climbing higher and higher. So for example, 1e-02 would be higher than 1e-03.
Then the BLUE, RED, and GREEN lines (axis) are the TR levels that were recorded. They span all the way across from 50hz on the right side all the way to 0hz on the left side. The BLUE line is the Z axis (up and down movement), the RED line is the Y axis (forward and backward movement) and the GREEN line is the X axis (side to side movement). Usually the closer these lines are in relation to one another, the better, giving a more powerful balanced TR feel.
If you look on my graph, all three axis are pretty decent in relation to one another as well as the 'intensity' level across the board being pretty similar, except in the 10-14hz region where I get a big TR spike that jumps about 10-15db on the Z axis (BLUE). This is from my suspended floor, as these frequencies really excite the floor giving this extra bump in TR. I use to cut it a bit, but really like the way it feels down this low, so I just leave it in there now.
),you may have something similar going on as well at certain frequencies since you guys are on a suspended floors too. The White Noise 0-50hz file when VSed will show if you do (it shows what going on with all frequencies across the board up to 50hz, excluding under 10hz of course since VS doest read well at all under this point).
So there is all that. Hopefully that all made sense
So how to do this:
If your guys are interested, it’s pretty easy for the most part. I use the IPhone 6 to run VS. It works great on this phone, but should work on others as well.
Steps for getting the White Noise 0-50hz file:
1. Go to the VibSensor thread HERE
2. In the 1rst post, click on the link WN and Bursts.
3. Then download the file named White_PN_131072_48000_0_50.wav
4. Burn it to a disc or use a USB stick or drive to play it through your Blu-ray player.
Steps for taking the measurements:
1. Download the VibSensor App (free app I think)
2. Open the app once you get it downloaded to your phone.
3. Press the acquire button at the bottom of the interface.
4. Before you take the TR reading, on the screen that comes up, type in the Title
: something like FV25/WN-0-50/-10mv for the Rythmik.
5. Then on that same screen set a 5 second 'Delay
' (so you have time (a count down before it starts recording) to start the phone once it's placed on the seat, and press play on your White Noise File (or time stamp on a movie).
6. Then on that same screen set the 'Duration
' of about 10 seconds. 10 to 20 seconds is good. Try to keep them to not much over 20 though or the lines for the reading get a bit squiggly and harder to read the longer the time.
7. Take the reading: 1. Place the phone face up on the surface of your seat cushion with the top of the phone facing forward. 2. Press ‘start’ on the phone to start the 5 second countdown (once it counts down 5 seconds it will start taking the VS reading for the duration you set (10 seconds for white noise should be fine). 3. In that 5 second countdown, place a 5lb bag of rice over the phone and press play on your remote control to play the White Noise 0-50hz file through your blu ray player to capture the reading. Use stereo. You can use Dolby or whatever, but I find stereo to be the best.
you’ll want to use a 5lb bag of rice on top of the phone for accurate results. We’ve tested different weights in the VS thread back when I was real active in it a couple of years ago and we all found that 5lbs is the best making it the most accurate in the 10-50hz range. It’s just enough weight to keep the phone in contact with the seat surface at all times (no weight and it bounces and moves around too much) but not too much to as skew the readings too much. You can easily pick up a 5lb bag of rice at the grocery store.
- press the ‘View Data’ (right next to 'Aquire') at the bottom of the phone. Press linear view to see it appropriately. Snap a pic if you want to post it. You'll probably have to save it to a jpeg file first though in whatever program you have.
May sound kind of complicated at first, but really it’s pretty easy after you do it once. Plus it can be kind of fun sometimes
You can also do this with any time stamp in a movie, which really can be fun to see what kind of TR your getting on some of your favorite bass scenes in these movies. I did an 8 second one last week (for fun) from one of the scenes from ‘The Incredible Hulk’ that I'll post as well just to give another example (from a movie time stamp if that's what you want to use). Time stamp and settings I used are in the 'Title'. It’s when Edward Norton falls from the chopper and hits the ground. Lots of LF and ULF
If you guys decide to try this to compare the subs even more, I hope this can help and wasn’t too confusing.
If your really into TR from these movies (which I think most of you guys are
), VIbSensor is an invaluable tool to have in your bag of tricks for many reasons IMO to get the most out of the TR in your system. VS is to TR like REW is to FR
So besides for just this comparison purpose of these two subs in this thread, you may find VS to be a great tool to help you get the most out of the TR (optimized) in your own rig, especially if you run TT's and NF subs in the mix.
Awesome thread and comparison you guys!!! I eventually went DIY with my subs for different reasons (mainly from a cost standpoint), but did have a JTR 2400 (older amped version) and a Rythmik FV15HP (I still have it and love it) at he same time and compared them quite a bit about 2 years ago. I pretty much totally agree with everything that had been said about the differences of the two and noticed it right away, as I had had the Rythmik already (and was really used to it) before I got the JTR. Both great subs for sure, but most definitely have different characteristics. I actually thought more so sound wise than TR wise though.
Cheers all and Happy Holidays!!