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PULSE--Subwoofer Test - Page 3

post #61 of 254
Thanks!

The mains are Klipsch KLF-30s. Despite their sensitivity of 102dB and a rating of 200W RMS, they can't keep up with the subs! The center channel is a Klipsch C-7.

When I get to about -12dB on my pre-amp, the main amp (Adcom GFA-5500) clipping LEDs begin flashing on some material.

I suppose I could try that Pulse segment at -12dB, but I think my house would begin falling apart then! I have several large fish tanks in the house (200 gallons each), so I'd hate to take them out!

The subs already took out my calcium reactor (for the reef tank). Here's a picture showing a chunk missing from the blue base. Fortunately, the 20A breaker feeding the Crown amps blew, so I was able to hear the water splashing out of the reactor and act accordingly.

post #62 of 254
Thread Starter 
House destroying bass is so cool
post #63 of 254
When I played the scene I got "chuffing" at only -27db MV . Reference is -15db for 75db avr test tones. I have the SVS 25-31PCi tuned to 22hz.

Room is 12x16x8 or so
post #64 of 254
What is "Pulse"??
post #65 of 254
Quote:
Originally Posted by bigdaddy999 View Post

What is "Pulse"??

this movie:

http://www.imdb.com/title/tt0454919/
post #66 of 254
The equalization of this movie is all over the place. Dialogue was too low and the over all volume from the main channels were far from Dolby's reference levels. I think the engineer was on dope. He probably wrote the script as well.

Ian
post #67 of 254
Quote:
Originally Posted by bgillyjcu View Post

House destroying bass is so cool

I can't top pclausen, but my drywall is cracking on the wall that my IB is attached to.
post #68 of 254
Where do I get this PULSE test? Id like to try it to compare my old subwoofer with my new one? Thanks!
post #69 of 254
Pulse is a movie.
post #70 of 254
These sub tests are fun, but how do you know how much distortion you're getting? I can easily hit 110@LP with my IB but it sounds a hell of a lot different from 110 on something like a single VTF3HO.
post #71 of 254
Quote:
Originally Posted by Jesse S View Post

These sub tests are fun, but how do you know how much distortion you're getting? I can easily hit 110@LP with my IB but it sounds a hell of a lot different from 110 on something like a single VTF3HO.

It has been said that we can't perceive distortion at low frequencies until it gets around the 10% range. So I believe the differences you would hear with an IB sub vs. a ported sub is the differences in the system's group delay, natural response curve, etc.

The only way I have learned to test distortion with subs is when you increase your volume by 1dB, you should see 1dB on your meter as well. So when you start distorting an increase in volume by 1dB would not show a 1dB increase on the meter. It makes sense that these measurements should be nearfield (1m from the sub) so your room isn't much of a factor. This is how I conducted my Pulse test.
post #72 of 254


10% is quickly exceeded when you push these subs. This is the SVS PB12+/2.

Even at 95db it is already at 8%. At 100db it's already 15%. Raising in 1db increments only illustrates subwoofer compression.

I tried this scene in Pulse today on my IB. At 90db on the rat shack the walls and ceiling are already shaking. I can't see wanting to play this at 110db+.
post #73 of 254
Quote:
Originally Posted by Jesse S View Post

Raising in 1db increments only illustrates subwoofer compression.

I'll back up and correct myself that the 1dB method will be a good indicator of reaching your subwoofer system's limit and not a good method of measuring distortion alone. Distortion doesn't necessarily equate reaching your subwoofer's limits which I incorrectly correlated the two in my previous post.

I don't know how we can accurately measure distortion with the affordable tools we have at our disposal. Perhaps someone else can help out with that.

Aww comon.. you know you want to see what your subs limit is with this scene!
post #74 of 254
Quote:
Originally Posted by FroDaddy View Post

I can't top pclausen, but my drywall is cracking on the wall that my IB is attached to.

i have "nail pops" in the corners of my room

could be a coincidence

post #75 of 254
looks like "Pulse" will be on Starz HD:

STARZHD Thu 7/12 11:15 AM

STARZHD Thu 7/12 11:30 PM

STARZHD Fri 7/13 6:00 AM

STARZHD Sat 7/21 4:50 AM

STARZHD Sat 7/21 4:20 PM

STARZHD Sat 7/21 11:00 PM

i can't guarantee it will be in dolby digital
post #76 of 254
Results from Flageborg in Norway:

1. 110db at LP
2. (not an option in my Theatre)
3. acoustical endless
4. ref. my signature
5. MasterVolum -25
post #77 of 254
1. 108db @lp (11' away)
2. no, my ears can't take it
3 1600 cubic' basement, concrete slab
4. IB four Avalanche 18" drivers, Behringer Ep2500 amp
5. -10 (+1 is 85db in Avia) so about 11db under reference, LFE is 4db "hot"

I'll try louder when no one else is home but at 108db the walls are vibrating like mad
and the pressure on the ears is pretty high too. My drivers are moving about 10-15mm to hit 108db and they have 27mm of xmax. Also my IB "hatch" isn't sealed properly yet and it's rattling quite a lot. If I lean on the hatch the meter reading jumps about 3db.
post #78 of 254
Quote:
Originally Posted by Jesse S View Post

1. 108db @lp (11' away)
2. no, my ears can't take it
3 1600 cubic' basement, concrete slab
4. IB four Avalanche 18" drivers, Behringer Ep2500 amp
5. -10 (+1 is 85db in Avia) so about 11db under reference, LFE is 4db "hot"

I'll try louder when no one else is home but at 108db the walls are vibrating like mad
and the pressure on the ears is pretty high too. My drivers are moving about 10-15mm to hit 108db and they have 27mm of xmax. Also my IB "hatch" isn't sealed properly yet and it's rattling quite a lot. If I lean on the hatch the meter reading jumps about 3db.




Have you ever considered reporting for the weather channel?

Ian
post #79 of 254
Quote:
Originally Posted by otk View Post

looks like "Pulse" will be on Starz HD:

STARZHD Thu 7/12 11:15 AM

STARZHD Thu 7/12 11:30 PM

STARZHD Fri 7/13 6:00 AM

STARZHD Sat 7/21 4:50 AM

STARZHD Sat 7/21 4:20 PM

STARZHD Sat 7/21 11:00 PM

i can't guarantee it will be in dolby digital

DVR'd it today and it is in dolby digital on starz-HD and it's the most awesome LFE effect i ever heard !!!!!!!!

post #80 of 254
Yes, it is damn powerful. It's actually ridiculous. In fact, it's what made me start this thread:

http://www.avsforum.com/avs-vb/showthread.php?t=873147
post #81 of 254
I rented that movie to only test my subs. I never even watched it. When I add 2 more subs I will repost what I get.
post #82 of 254
Quote:
Originally Posted by MKtheater View Post

I rented that movie to only test my subs. I never even watched it. When I add 2 more subs I will repost what I get.

does the DVD have a DTS track?
post #83 of 254
I don't even remember, check out the first post it will say whether it was or not.
post #84 of 254
Quote:
Originally Posted by MKtheater View Post

I don't even remember, check out the first post it will say whether it was or not.

nope, nothing about DTS and i just checked netflix which pretty much confirms there is no DTS track available on the DVD but netflix is showing it available in hd-dvd which does have the dolby trueHD audio track which can be confirmed in this review:

http://hddvd.highdefdigest.com/pulse.html

*cut/paste of the audio portion*

Though labeled only as "Dolby 5.1" on the back of the box, 'Pulse gets a full-on Dolby TrueHD 5.1 surround track. Why the Weinstein company would decide to virtually hide such a nice selling point (as they also did on 'Clerks II') is a head-scratcher.

Unfortunately, despite the lossless mix, I thought the film's sound design was just okay. For a movie about technology, I expected a lot more eerie ambience. Where's the ominous static, the low bass tones, the doors creaking in the surrounds? Alas, aside from the typical shock stingers (yawn -- wasn't this stuff already passe ten years ago?), the rears lacked heft for me. Even the film's forgettable score and pop/rock songs sounded muddy and flat. Low bass and dynamics are also decent but not exceptional. Dialogue, however, was always intelligible, and well balanced in the mix. Not that you actually want to hear what any of the characters have to say.
post #85 of 254
I'm picking the HD DVD up at BestBuy on the way home tonite
(in about 15 minutes)

Although I only have a modest 7.1 Yamaha system,
and a 12" Velodyne 400 watt sub, I'm totally willing to spend the $25
to feel the walls shake in my little apartment.

I think my sub is only capable of 24Hz-30Hz at best, but it should still be fun.
post #86 of 254
Quote:
Originally Posted by PioManiac View Post

I'm picking the HD DVD up at BestBuy on the way home tonite
(in about 15 minutes)

Although I only have a modest 7.1 Yamaha system,
and a 12" Velodyne 400 watt sub, I'm totally willing to spend the $25
to feel the walls shake in my little apartment.

I think my sub is only capable of 24Hz-30Hz at best, but it should still be fun.

lucky you. you're going to get to experience it in uncompressed "lossless"

i'm holding off on 7.1 until the format war settles down a bit and the equipment makers (both players and receivers) get their acts together
post #87 of 254
Quote:
Originally Posted by PioManiac View Post

I'm picking the HD DVD up at BestBuy on the way home tonite
(in about 15 minutes)

Although I only have a modest 7.1 Yamaha system,
and a 12" Velodyne 400 watt sub, I'm totally willing to spend the $25
to feel the walls shake in my little apartment.

I think my sub is only capable of 24Hz-30Hz at best, but it should still be fun.




Just don't get evicted


Djoel
post #88 of 254
WOW!, just Wow!!!
I must say, I have a new respect for you guys with premium sound systems,
superior amplifiers, and Large multiple woofers!!!
As the "pulse" begins when the girl starts down the hall, the bass frequencies are already dipping below the 40Hz capabilities of my front towers (Mission M34i's) Ö !
...without the sub on, it's just barely audible. But as she opens the door, and the bottom REALLY drops into the 20Hz's, My little Velo DPS-12 is huffin' like an old 2-Pack/Day Smoker who decided to take up jogging lol!

Sure the walls were shaking , even at low volume,
But when I pulled the cover off the sub, and watched my driver getting worked!...
it was clear to me this bass run is the King,
and it whooped my @ss and left my sub crying for relief.
I may need to tweek my crossover settings on my AVR and my sub

...the good news is I didnt get evicted, so it's probably a good thing I dont have anything more powerful...yet. Possesion on my new home is still 8 months away,
then "I'll BE BACK!!!"
post #89 of 254
Your DPS 12 is no slouch. Even in a large room it will cleany extend down to 20hz.(See Tom Nousaine's subwoofer review chart) As far as the Pulse sound track is concerned, yes it has this very dynamic scene and everyone expects it to produce great audio. But even in True HD, over all, it doesn't make the pack. It's a low budget movie, you can't expect the master to muster the sound of a high buget audio track. After all this isn't WOW or Lord OF The Rings, so except for that one sub 20hz scene, there really isn't much to make a real fuss about.

Ian
post #90 of 254
Quote:
Originally Posted by PioManiac View Post

WOW!, just Wow!!!
I must say, I have a new respect for you guys with premium sound systems,
superior amplifiers, and Large multiple woofers!!!
As the "pulse" begins when the girl starts down the hall, the bass frequencies are already dipping below the 40Hz capabilities of my front towers (Mission M34i's) Ö !
...without the sub on, it's just barely audible. But as she opens the door, and the bottom REALLY drops into the 20Hz's, My little Velo DPS-12 is huffin' like an old 2-Pack/Day Smoker who decided to take up jogging lol!

Sure the walls were shaking , even at low volume,
But when I pulled the cover off the sub, and watched my driver getting worked!...
it was clear to me this bass run is the King,
and it whooped my @ss and left my sub crying for relief.
I may need to tweek my crossover settings on my AVR and my sub

...the good news is I didnt get evicted, so it's probably a good thing I dont have anything more powerful...yet. Possesion on my new home is still 8 months away,
then "I'll BE BACK!!!"





Sounds like your having a good time with that demo,I've seen this using my Fathom F113 and the whole sofa experience a tactile affect,my Gf just looks at me with sheer terror in her face. She ask me do you think the neighbor mind! What are you going to do? We'll just blame the cars out side with blasting systems. I am aalso in need of a house...Then I can get twin F113


Djoel
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