Official JTR speaker thread - Page 811 - AVS Forum | Home Theater Discussions And Reviews
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Old 10-09-2014, 07:45 AM
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Quote:
Originally Posted by Sibuna View Post
Edge of Tomorrow... careful guys!

Post #38 has a graph, the OS wont play the lowest notes but there is enough above that that you will feel. the first post in that thread has a vid what it does with 2 Gjallarhorns.

The OS acts like an 18" sealed sub down low so it will still play the 10hz stuff just not with the same authority - at least I'm pretty sure how it works.
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Old 10-09-2014, 07:59 AM
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Quote:
Originally Posted by Sibuna View Post
Edge of Tomorrow... careful guys!

Post #38 has a graph, the OS wont play the lowest notes but there is enough above that that you will feel. the first post in that thread has a vid what it does with 2 Gjallarhorns.
The OS will act like a sealed sub below the port tune frequency and duals were pretty flat to 7hz in my room (as measured by Jeff). I think they may be able to reproduce that 10hz wave.

Here is the raw data main seat measurement taken by Jeff the day we installed the first OS's. The LFU model would have a bit more to give down low.
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Old 10-09-2014, 08:10 AM
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Originally Posted by RMK! View Post
The OS will act like a sealed sub below the port tune frequency and duals were pretty flat to 7hz in my room (as measured by Jeff). I think they may be able to reproduce that 10hz wave.
Yeah but that's just 3 18" (Lance's setup) sealed subs which would pale in comparison to the output of the OS above 20hz. I bet if you had ran some compression sweeps the low stuff would stop keeping up pretty quickly on a graph as you went louder and louder.

I'm not ripping the OS, it's my all time favorite subwoofer and I've heard a lot of subwoofers.
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Old 10-09-2014, 08:31 AM
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Yeah but that's just 3 18" (Lance's setup) sealed subs which would pale in comparison to the output of the OS above 20hz. I bet if you had ran some compression sweeps the low stuff would stop keeping up pretty quickly on a graph as you went louder and louder.

I'm not ripping the OS, it's my all time favorite subwoofer and I've heard a lot of subwoofers.
True, crazy output over 20hz but if it can get to 110db at 10hz then you will feel it in a normal sized room. Also true that the "effect" would be overwhelmed by the >20hz content. Please, let's not start that "importance of ULF" discussion again.

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Old 10-09-2014, 08:32 AM
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Quote:
Originally Posted by RMK! View Post
The OS will act like a sealed sub below the port tune frequency and duals were pretty flat to 7hz in my room (as measured by Jeff). I think they may be able to reproduce that 10hz wave.
I don't know how close to those numbers i got but I think I may have been in the area when it got a bit scary. My room will make a difference of course, but do you recall what your levels were on the subs and on the av to get flat to 7hz?
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Old 10-09-2014, 08:39 AM
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I don't know how close to those numbers i got but I think I may have been in the area when it got a bit scary. My room will make a difference of course, but do you recall what your levels were on the subs and on the av to get flat to 7hz?
I don't recall what the source was on those initial measurements. They were taken pre any EQ and I was really anxious to get to hearing them with actual content. Once I did, I didn't really care about the measurements ...

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Old 10-09-2014, 09:05 AM
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Since we're talking about extreme bass here, I am a bit worried about the impact these bass would have on the floor right above the basement. If i stuck some rubber pads (those rubber inlays they use for carpets) onto the concrete ceiling, then follow by some rockwool, would that help? I am thinking, when the big wave hits the rubber, it won't really transfer to the concrete, and therefore, won't be transfering thru the entire concrete slab as well.. i intend to stick the same rubber on all walls and floor.. so, all bass will hit the rubber first before being transfered to concrete...
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Old 10-09-2014, 09:27 AM
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Quote:
Originally Posted by Sibuna View Post
Edge of Tomorrow... careful guys!

Post #38 has a graph, the OS wont play the lowest notes but there is enough above that that you will feel. the first post in that thread has a vid what it does with 2 Gjallarhorns.
Adam,

carp and RMK! are right. An orbit shifter behaves at a minimum as an equivalent single sealed sub below the horn's knee, because it is a front loaded horn. (meaning one side of the driver faces a sealed space)
Dayton Audio UM18-22 18" Ultimax to be released


At best it behaves with a 2 to 3dB improvment over the exact same driver in a single sealed enclosure because of the horn's load.
Driver excursion below the knee, horn vs. sealed


So a pair of Orbit Shifters would strictly speaking be at minimum equivalent to two cap s1 below 25hz. However with the horn loading the pair might be closer to say 3 Captivator S1s? at the lowest frequencies according to the data represented in the thread linked above by LTD02.
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Old 10-09-2014, 09:53 AM
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well I stand corrected, for some reason I thought it rolled off higher then it does
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Old 10-09-2014, 10:30 AM
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So reading the information on the OS....it seems to have the best of both worlds in terms of sealed vs ported/horn. Why wouldn't one chose the OS over the S2? Seems to be the best of both.


Am I missing anything?

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Old 10-09-2014, 10:32 AM
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Quote:
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So reading the information on the OS....it seems to have the best of both worlds in terms of sealed vs ported/horn. Why wouldn't one chose the OS over the S2? Seems to be the best of both.


Am I missing anything?
1)Size - OS is like big foot

2)performance under 20HZ is inferior to S2

3)performance over 20HZ is superior to S2
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Old 10-09-2014, 10:44 AM
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1)Size - OS is like big foot

2)performance under 20HZ is inferior to S2

3)performance over 20HZ is superior to S2
True, it is a big beast and certainly not as pretty as the S2 but if you're going duals and maybe have them behind an AT screen and based upon this from RMK:


"The OS will act like a sealed sub below the port tune frequency and duals were pretty flat to 7hz in my room (as measured by Jeff). I think they may be able to reproduce that 10hz wave."


Seems like you can get the best of both from dual OS's.

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Old 10-09-2014, 11:07 AM
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Quote:
Originally Posted by Nabs17 View Post
True, it is a big beast and certainly not as pretty as the S2 but if you're going duals and maybe have them behind an AT screen and based upon this from RMK:


"The OS will act like a sealed sub below the port tune frequency and duals were pretty flat to 7hz in my room (as measured by Jeff). I think they may be able to reproduce that 10hz wave."


Seems like you can get the best of both from dual OS's.
I have 1 OS and a couple of HSU 15s sealed.

For me, personally, i prefer the music quality of the sealed subs. Unless I am listening to music with a lot of 'bass', i would turn off my OS. Both my HSUs works very well with the JTR 212s, making them sort of full range seamlessly...

Of course, when it comes to output, the OS will put both the 15s to shame.

This is not to say the OS is not musical.. since they do behave a bit like sealed subs, they are very, very clean, but for some reason, perhaps a tad bit hard to control... it's like having a bull in a china shop (although this saying makes no sense as bulls are quite adroid and will probably not break anything in a china shop)...
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Old 10-09-2014, 11:20 AM
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I have 1 OS and a couple of HSU 15s sealed.

For me, personally, i prefer the music quality of the sealed subs. Unless I am listening to music with a lot of 'bass', i would turn off my OS. Both my HSUs works very well with the JTR 212s, making them sort of full range seamlessly...

Of course, when it comes to output, the OS will put both the 15s to shame.

This is not to say the OS is not musical.. since they do behave a bit like sealed subs, they are very, very clean, but for some reason, perhaps a tad bit hard to control... it's like having a bull in a china shop (although this saying makes no sense as bulls are quite adroid and will probably not break anything in a china shop)...
Can you say EQ? ...

Get another OS, put em behind the screen, EQ them and say by by to the HSU's.
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Old 10-09-2014, 11:24 AM
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Quote:
Originally Posted by Nabs17 View Post
True, it is a big beast and certainly not as pretty as the S2 but if you're going duals and maybe have them behind an AT screen and based upon this from RMK:


"The OS will act like a sealed sub below the port tune frequency and duals were pretty flat to 7hz in my room (as measured by Jeff). I think they may be able to reproduce that 10hz wave."


Seems like you can get the best of both from dual OS's.
I believe your last statement is correct and were it not for my wanting to try full range speakers and now liking the sound of the 215RT's so much, I'd still have 212's and OS's. Probably should have gone with the non-LP 212's but that is really just second guessing as I personally did not find them lacking midbass.

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Old 10-09-2014, 11:28 AM
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Originally Posted by RMK! View Post
Can you say EQ? ...

Get another OS, put em behind the screen, EQ them and say by by to the HSU's.
I haven't tried that for sure..

But that would require me to get 'a good equalizer', and then use external amps.

I am perfectly happy with running everything off of my receiver.. i like things simple if i can get away with it...

And switching off the OS makes most music i listen to really, really good... and then switching on the OS for movies and other types of music.. that works for me..
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Old 10-09-2014, 11:38 AM
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Is this true for all or most FLH designs? I have never modeled a FLH only TH and sealed/ported/vented.

If so how does the driver behave at below its tune with a general FLH design? Does it need to be turned down to keep the drivers from over excursion or do they simply roll off with an added slope on top of the users set slope? Hope that can be deciphered to make a little sense lol.
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Old 10-09-2014, 11:50 AM
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I haven't tried that for sure..

But that would require me to get 'a good equalizer', and then use external amps.

I am perfectly happy with running everything off of my receiver.. i like things simple if i can get away with it...

And switching off the OS makes most music i listen to really, really good... and then switching on the OS for movies and other types of music.. that works for me..
I'm just messin witch ya, stay the course as you are smart to keep it simple.
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Old 10-09-2014, 03:01 PM
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(EOT) + (-16 subs) + (-10 master volume) / 0:37 seconds =

If I go down to reference, I'll probably have to blur out the next text msg from her
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Old 10-09-2014, 03:39 PM
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(EOT) + (-16 subs) + (-10 master volume) / 0:37 seconds =

If I go down to reference, I'll probably have to blur out the next text msg from her
Is it just me, or do the blurs look like pics of his junk?
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Old 10-09-2014, 03:43 PM
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Is it just me, or do the blurs look like pics of his junk?
OMG..I just spit up on myself....because I looked..and because I agree with you..and because I laughed like a little school girl
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Old 10-09-2014, 04:24 PM
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Official JTR speaker thread

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Originally Posted by RMK! View Post
Is it just me, or do the blurs look like pics of his junk?


Quote:
Originally Posted by Frohlich View Post
OMG..I just spit up on myself....because I looked..and because I agree with you..and because I laughed like a little school girl

Ha...Dirty old men :P
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Old 10-09-2014, 07:10 PM
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(EOT) + (-16 subs) + (-10 master volume) / 0:37 seconds =

If I go down to reference, I'll probably have to blur out the next text msg from her
Ha! I though mys wife an I were the only ones Tamar text each other in the same house. I occasionally get a txt message to turn things down too.
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Old 10-09-2014, 08:13 PM
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Besides the bass in EOT. The whole surround mix was just amazing. The movie really brings the best out of the slanted 8's. These S8's still amazes me in such a small enclosure. Got me to whole different level in surround sound and multi channel music. And honestly I think the 215's sounds best at FR. Even with the subs engaged.
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Old 10-09-2014, 08:22 PM
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Besides the bass in EOT. The whole surround mix was just amazing. The movie really brings the best out of the slanted 8's. These S8's still amazes me in such a small enclosure. Got me to whole different level in surround sound and multi channel music.
Can't agree with you more...the S8 are awesome speakers...And EOT is one of the best mixed blu-ray out and an excellent movie on top of that...Jeff should include it with every JTR order.
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Old 10-09-2014, 09:05 PM
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so I finally got to watch EOT and the opening sound wave was pretty crazy. I know my system isn't doing much below 15hz, but I was definitely feeling some crazy bass for a few seconds that I could not really hear, just feel. Not a bad movie either. Here is my movie eq with a -10dB sub trim and the subs at -3dB on the sub amp. This is with a 72dB sweep. Still comes out to about a 10-12dB house curve. We only watched the film at -20 though. Tmrw I'll try it at ref when the wife is not in the room


That scene for you guys that have the huge sealed sub set ups must be insane!
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Old 10-09-2014, 09:12 PM
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Quote:
Originally Posted by coolgeek View Post
I have 1 OS and a couple of HSU 15s sealed.

For me, personally, i prefer the music quality of the sealed subs. Unless I am listening to music with a lot of 'bass', i would turn off my OS. Both my HSUs works very well with the JTR 212s, making them sort of full range seamlessly...

Of course, when it comes to output, the OS will put both the 15s to shame.

This is not to say the OS is not musical.. since they do behave a bit like sealed subs, they are very, very clean, but for some reason, perhaps a tad bit hard to control... it's like having a bull in a china shop (although this saying makes no sense as bulls are quite adroid and will probably not break anything in a china shop)...
I really agree with the need for EQ, XO and time alignment with the OS. Otherwise it is like they can walk all over you system.
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Old 10-09-2014, 09:42 PM
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Quote:
Originally Posted by lbrown105 View Post
so I finally got to watch EOT and the opening sound wave was pretty crazy. I know my system isn't doing much below 15hz, but I was definitely feeling some crazy bass for a few seconds that I could not really hear, just feel. Not a bad movie either. Here is my movie eq with a -10dB sub trim and the subs at -3dB on the sub amp. This is with a 72dB sweep. Still comes out to about a 10-12dB house curve. We only watched the film at -20 though. Tmrw I'll try it at ref when the wife is not in the room


That scene for you guys that have the huge sealed sub set ups must be insane!
-3 on sub amp?? Very brave sir. Looking forward to your thoughts once you go reference.
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Old 10-09-2014, 10:08 PM
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I have a question about bass vibrating the concrete walls around my basement bunker and that transfers the bass/vibration out of that room into the room upstairs from it or throughout the entire house (as the concrete walls / brick walls are all interconnected).

My idea is to stick a thin rubber sheet on all walls (those they use for carpet underlay type, about 3mm thick, or, even yoga matt), floor, and ceiling... in my mind, when the bass frequency hits that rubber, much of it's vibrations would be dampened by the rubber and it won't transfer to the concrete...

Am I right? or would i just be wasting my time...?

I am not looking for soundproofing per se, but to reduce concrete/brick slab vibrations when hit with massive bass waves which could follow the entire concrete/brick structure of the house...
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Old 10-09-2014, 10:11 PM
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EOT - Big Question before i play this move....

Can I damage my OS with it? Does the OS come with driver protection? I would hate to pop in a movie in the future, and without any notice, suddenly my OS blows apart!

The real question is... if you already set your system to be reference and you love the sound for most movies, and you don't realize it, popping in a new DVD with massive bass.. would that fry your subs? If this is the case, then shouldn't all DVD comes with a label that says 'warning - could damage sub... go slow on it'..
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