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Official Power Sound Audio Thread - Page 44

post #1291 of 10050
Quote:
Originally Posted by Bill Fitzmaurice View Post

Quote:
Originally Posted by RickMa View Post

Bill, What smoken is talking about is a cup of water on a side table approx 15 feet away from the sub. On his older sub he could make the water ripple, but not on the new one.
The table will have a resonant frequency. If that coincides with a room mode that's excited by the sub where the table is located it could vibrate enough to make a water glass dance. A different sub might not excite that room mode; for that matter the same sub might not excite it if you move it a few feet. With measuring gear you could find out exactly what's going on in a flash, but without it you can only guess.

very interesting theory ... do you know how fast sound travels though wood? do you think wood could vibrate at every frequency? versus just one?

its not crystal..

cheers
post #1292 of 10050
Quote:
Originally Posted by deltadube View Post

so many mathematical things going on here look carefully if you want great sounding rooms.

Not trying to split hairs, but where's the doorway as many of us have multiple open doorways and wall openings in our listening area? eek.gif

-
Edited by BeeMan458 - 1/22/13 at 4:22am
post #1293 of 10050
Quote:
Originally Posted by Lebreeze View Post

Well after reading this thread. I decided to mess around with my positioning of my xv-15 again. It's crazy how big a difference a few inches can make. I think its finally dialed in now. I just watched War of the Worlds again and I was honestly a little skeared biggrin.gif:eek:




Your theater looks great. Excellent setup.
post #1294 of 10050
Quote:
Originally Posted by deltadube View Post

very interesting theory ... do you know how fast sound travels though wood? do you think wood could vibrate at every frequency? versus just one?
its not crystal..
Wood may not be crystal but a table still has a resonant frequency. So does a cup made of wood, as would a table made of crystal. And there's nothing theoretical about any of this; rather, it's long understood physics. The speed of sound through wood will vary with the density of that wood, but the average is 12,000 feet per second, as opposed to 1128 FPS in air at 68 degrees F at sea level.
post #1295 of 10050
Bulls fan here...i was watching this game last night ...except I wish I had ur setup :-). I bet it sounded awesome with that xv15 beast.
post #1296 of 10050
Quote:
Originally Posted by mrsinister View Post

Guess I should finally change my Sig and post in here. (Ive been trolling PSA far too long!)

Dual XV-15 on the way. 4 more days! Have a feeling this is going to rock a lot harder than my sealed ED Sub!!! biggrin.gif

Congrats, let us know your thoughts when they arrive. They are monsters, and the duals is an outstanding way to go. How big is the space they are going in? Dedicated theater or living room?
post #1297 of 10050
Quote:
Originally Posted by SmokenAshes View Post

Quote:
Originally Posted by suresh6877 View Post

I have another theory. Perhaps your HSU sub was not inert and as a result may have been vibrating. Now if that HSU sub was directly coupled to the floor (assuming not a concrete floor), could cause the floor to resonate. The table at 15' distance, which is still coupled to the floor could vibrate.

Probably

I just hooked up the HSU and ran the same scene. Lol now the water didn't ripple like it did in the video. Lol I'm going mental!




You are complaining that your XS30 doesn't move the water in that cup and Im complaining that my XS30 is shaking the whole living room?
post #1298 of 10050
Quote:
Originally Posted by losservatore View Post

You are complaining that your XS30 doesn't move the water in that cup and Im complaining that my XS30 is shaking the whole living room?

How much rumble are you writing about? eek.gif
post #1299 of 10050
I apologize I wasn't trying to come off as complaining just confused and wondering why.
post #1300 of 10050
I can understand your curiosity, I'm curious to know why as well.

I can only guess, but it sounds like Bill hit the nail on the head - your new sub just doesn't excite the right modes to make the water "dance".
post #1301 of 10050
Quote:
Originally Posted by Alan P View Post

I can understand your curiosity, I'm curious to know why as well.

I can only guess, but it sounds like Bill hit the nail on the head - your new sub just doesn't excite the right modes to make the water "dance".
If you're really hell bent on seeing it dance get a sine wave generator and sweep it until you find the magic frequency. But aside from making a youtube video of it what's the point? Like this one:
http://www.youtube.com/watch?v=8TNjr91FxaA

Did your glass do dat? eek.gif
Edited by Bill Fitzmaurice - 1/22/13 at 3:06pm
post #1302 of 10050
Quote:
Originally Posted by SmokenAshes View Post

XsOk guys I'm confused. Remember that video I made of my HSU VTF3 MK4 with the Underworld Awakening scene with the super lycan and the cup of water. Well I played the same scene with the XS30 and the water didn't move...at all....like tiny little ripples. I don't understand. I know I have this thing dialed in because I just got done watching Total Recall and my god, at end of it with the fighting scenes in "the fall".....I literally felt like I got off a rollercoaster ride! My HSU never did that, it just felt boomy during that part. So my question is how come the XS30 ain't moving this water, I know for damn sure its more powerful from other scenes I have tried. I also have tried moving the cup of water around. I even placed it ON TOP of the sub and yet nothing!

Do you have your HSU in 16hz Tune mode?

 

It could be your HSU may be playing louder than the XS30 on some frequencies (if I had to guess; more output between 16-22hz). IIRC, the HSU is close to the Outlaw EX, but has a bit more output. If this is the case, it could be that the content your playing is highlighting those frequencies where the HSU has more output; and causing the ripples in the water.

 

Your XS30 will really shine from 30hz and up compared to the HSU, and could be giving you that tactile midbass slam rollercoaster ride; where the HSU might be perceived as 'boomy' (relatively speaking) during the same content.

post #1303 of 10050
Quote:
Originally Posted by Bill Fitzmaurice View Post

If you're really hell bent on seeing it dance get a sine wave generator and sweep it until you find the magic frequency. But aside from making a youtube video of it what's the point? Like this one:
http://www.youtube.com/watch?v=8TNjr91FxaA

Did your glass do dat? eek.gif

HA!!
Bill that was amazing. I'd be afraid of my house coming down lol.
post #1304 of 10050
Not sure of the size... my living room connects to the kitchen/dining room/upstairs/entire house. Really difficult to pressurize the room. Not a large house, just old and thin walls/hardwood.
post #1305 of 10050
Quote:
Originally Posted by BeeMan458 View Post

Quote:
Originally Posted by deltadube View Post

so many mathematical things going on here look carefully if you want great sounding rooms.

Not trying to split hairs, but where's the doorway as many of us have multiple open doorways and wall openings in our listening area? eek.gif

-

dam good observation smile.gif you can build pretty nice sound proof door ways too these days..

that string is from a guy named Winer he has excellent advice ...

http://www.gearslutz.com/board/studio-building-acoustics/610173-acoustics-treatment-reference-guide-look-here.html

http://www.realtraps.com/art_room-setup.htm

cheers
post #1306 of 10050
Quote:
Originally Posted by Bill Fitzmaurice View Post

Quote:
Originally Posted by deltadube View Post

very interesting theory ... do you know how fast sound travels though wood? do you think wood could vibrate at every frequency? versus just one?
its not crystal..
Wood may not be crystal but a table still has a resonant frequency. So does a cup made of wood, as would a table made of crystal. And there's nothing theoretical about any of this; rather, it's long understood physics. The speed of sound through wood will vary with the density of that wood, but the average is 12,000 feet per second, as opposed to 1128 FPS in air at 68 degrees F at sea level.

so like 10 times faster eh..

cheers..
post #1307 of 10050
Quote:
Originally Posted by losservatore View Post

Quote:
Originally Posted by SmokenAshes View Post

Quote:
Originally Posted by suresh6877 View Post

I have another theory. Perhaps your HSU sub was not inert and as a result may have been vibrating. Now if that HSU sub was directly coupled to the floor (assuming not a concrete floor), could cause the floor to resonate. The table at 15' distance, which is still coupled to the floor could vibrate.

Probably

I just hooked up the HSU and ran the same scene. Lol now the water didn't ripple like it did in the video. Lol I'm going mental!




You are complaining that your XS30 doesn't move the water in that cup and Im complaining that my XS30 is shaking the whole living room?

lucky guy whole house shaking
post #1308 of 10050
anybody know the rates to have an xs 30 or 2 xs 15 shipped to canada?

thanks
post #1309 of 10050
Quote:
Originally Posted by deltadube View Post

anybody know the rates to have an xs 30 or 2 xs 15 shipped to canada?

thanks
Give PSA a call. They are very helpful and will give you a quote.
post #1310 of 10050
Quote:
Originally Posted by deltadube View Post

dam good observation smile.gif you can build pretty nice sound proof door ways too these days..

that string is from a guy named Winer he has excellent advice ...

http://www.gearslutz.com/board/studio-building-acoustics/610173-acoustics-treatment-reference-guide-look-here.html

http://www.realtraps.com/art_room-setup.htm

cheers

Oh goodie. More homework. tongue.gif

Thanks for the linked information. biggrin.gif
post #1311 of 10050
I have decided I'm going to exchange the XS30 for the XV30.
post #1312 of 10050
Interesting. Why is that?
post #1313 of 10050
Took and I have been talking about it, the amount of help he provides is unparalleled. But the reason is I want that strong output in the 16-30hz range. Also he had told me the 2db difference in the upper bass wouldn't be a major factor in most scenarios. I've always had a ported sub and the XS30 would be my first sealed, I think I just like ported more IMO.
post #1314 of 10050
Tom and I is what I meant (dang auto correct)
post #1315 of 10050
Another reason that I'm looking at is if I'm going to spend the money, might as well get the baddest biggest MF they got so I'm not second guessing myself.
post #1316 of 10050
Quote:
Originally Posted by SmokenAshes View Post

Another reason that I'm looking at is if I'm going to spend the money, might as well get the baddest biggest MF they got so I'm not second guessing myself.
Ahh...Now that's reasoning for ya.
No doubt you will be blown away by the beast. Good choice.
post #1317 of 10050
Quote:
Originally Posted by dominguez1 View Post

Do you have your HSU in 16hz Tune mode?

It could be your HSU may be playing louder than the XS30 on some frequencies (if I had to guess; more output between 16-22hz). IIRC, the HSU is close to the Outlaw EX, but has a bit more output. If this is the case, it could be that the content your playing is highlighting those frequencies where the HSU has more output; and causing the ripples in the water.

Your XS30 will really shine from 30hz and up compared to the HSU, and could be giving you that tactile midbass slam rollercoaster ride; where the HSU might be perceived as 'boomy' (relatively speaking) during the same content.

I think you nailed it and this is clearly an advantage of a ported design vs a sealed when discussing bass around the tuning frequency. Of course you can overcome this by adding another XS30 smile.gif

There are always trade-offs with ported vs sealed. I really like ported subs, but they typically require a much bigger box.

XS30 dimensions:
(D x W x H): 23.5” x 18” x 22.5”

XV30 dimensions:
(D x W x H): 36” x 20.5” x 26.75”

If you can make the WAF work on the XV30, it is probably worth getting one unless you are going with multiples. Four XS30's would be awesome smile.gif
post #1318 of 10050
So am I hearing correctly that SmokenAshes doesn't like the sub because of weak response under 30ish HZ?

I thougth a sealed sub had a flatter response through the range(and lower) than ported and the ported sub only shined around the tuning. Maybe I should be asking this way...would 2 xs30s correct the problem he's having from 30 down?

I'm having serious problems trying to decide what I want, and was considering 2 xs30's becuase I have this dilusion that I need extension as low as possible. I think room size also plays a factor in how low a sub will realistically be effective and at 4600ft^3 I don't know how effective a pair of xs30's would be. Is 10hz feasible with a room that size?
post #1319 of 10050
to be honest I am in a ~2000ft^3 room with a single xv15 corner loaded and I am getting 75db down to 10hz so in short yes you should be able to get some response down to 10...might not be ruler flat but it will be there.

as Tom, puts it..98% of LFE content is from 16hz and up so is the goal realistic to go for the deepest extension possible?
post #1320 of 10050
Quote:
Originally Posted by JohnDean View Post

So am I hearing correctly that SmokenAshes doesn't like the sub because of weak response under 30ish HZ?

I thougth a sealed sub had a flatter response through the range(and lower) than ported and the ported sub only shined around the tuning. Maybe I should be asking this way...would 2 xs30s correct the problem he's having from 30 down?

I'm having serious problems trying to decide what I want, and was considering 2 xs30's becuase I have this dilusion that I need extension as low as possible. I think room size also plays a factor in how low a sub will realistically be effective and at 4600ft^3 I don't know how effective a pair of xs30's would be. Is 10hz feasible with a room that size?
Not trying to sound rude here but if you look at his previous posts, He is all over the place. One day he has a headache from too much bass, the next day he is upset because his cup of water doesn't move wink.gif. In my humble and most "uneducated" opinion, 2 XS-30s would be great in 4600 Sq ft. My single does wonders in 3000 sq ft. I had to go with nearfield placement because my listening position was in a null in the previous location. 2 subs would take care of that but not worth it on my setup. I would take the dual XS-30s any day!
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