YOUR subwoofer VIDEO thread - Page 4 - AVS Forum | Home Theater Discussions And Reviews
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post #91 of 137 Old 02-25-2017, 01:26 PM
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Just recorded this. Family is home so only 1 x bhs24 was playing. My daughter came running into the room from the other side of the house crying.

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post #92 of 137 Old 02-25-2017, 10:09 PM
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Quote:
Originally Posted by lz7j View Post
Just recorded this. Family is home so only 1 x bhs24 was playing. My daughter came running into the room from the other side of the house crying.

https://youtu.be/IwRtZi2dWbg
That might be the most excursion I've ever seen in a driver. You had to be near 4" peak to peak!?
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post #93 of 137 Old 02-26-2017, 05:28 AM
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I will set your new threshold then. Not mine:


Next time I put some video of mine...

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post #94 of 137 Old 02-26-2017, 05:51 AM
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Here is mine. newly acquired B&C 21DS115. Too bad it looks so tiny for 21" in the video, as it is massive...


Getting prepared put it in the proper box. Bassreflex 175l, basic tuning 33Hz, With large port area, I will propably stuff one or two (from four) ports to get in 20s with tuning in home usage.
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post #95 of 137 Old 02-26-2017, 07:58 AM
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Quote:
Originally Posted by lukeamdman View Post
That might be the most excursion I've ever seen in a driver. You had to be near 4" peak to peak!?
It's around 2.5-3". If I bump the trim another 2db, it will soft bottom in 10cf sealed with 6kw. My HST18's are closer to 4" P-P
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post #96 of 137 Old 02-26-2017, 04:29 PM
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Nothing nearly as impressive as those BHS-24's but here is my HST18 with single channel of an FP14k clone. Really not pushing it all that hard, the rest of the system gets too loud for my taste


Edit: and I just realized I recorded vertical, shame, shame, shame
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post #97 of 137 Old 02-26-2017, 06:15 PM
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Here is the SVS PB2000 playing ultra low frequencies from the beginning of the movie "Edge of Tomorrow" .
For next time I will need a better grip on the paper,
but you can see and hear the force of the driver.


Not bad for a 12" sub

Audyssey is a great start, but not always a great finish.
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post #98 of 137 Old 02-28-2017, 06:12 PM - Thread Starter
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Quote:
Originally Posted by Petr Berka View Post
I will set your new threshold then. Not mine:
https://www.youtube.com/watch?v=tHM0YbbdrX0

https://www.youtube.com/watch?v=cPD-g-hu8ho

Next time I put some video of mine...
Good lord! distortion has to be through the roof

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post #99 of 137 Old 03-01-2017, 11:13 AM
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Quote:
Originally Posted by newc33 View Post
Good lord! distortion has to be through the roof
Come on man. You're kind of slacking on your own thread.

We need some new material. Though I've yet to figure out if we're supposed to be impressed by high excursion or low excursion? I guess with your setup, it's the low excursion we should be impressed with
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post #100 of 137 Old 03-01-2017, 06:45 PM - Thread Starter
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Quote:
Originally Posted by albatros43 View Post
Come on man. You're kind of slacking on your own thread.

We need some new material. Though I've yet to figure out if we're supposed to be impressed by high excursion or low excursion? I guess with your setup, it's the low excursion we should be impressed with
Not really bud, it's just a subwoofer video thread and iv posted a few...

If it were a subwoofer excursion thread I would agree.

My subs aren't made for excursion man... they are designed quiet the opposite actually. Even at max it won't be impressive compared to most people here.

They might not move as much but damn they sure sound good

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post #101 of 137 Old 03-01-2017, 08:20 PM
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Here's another, this time the EoT intro scene. At 20 Hz the rattling noises are my front door and the entire opposite wall, especially the bathroom medicine cabinet on the other side of said wall, while at 15 Hz the "tinking" sound is my dining room chandelier 20+ feet away.


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post #102 of 137 Old 03-02-2017, 01:30 PM
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post #103 of 137 Old 03-02-2017, 01:45 PM
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This is about the only song I've came across that really is too deep for 99% of ported subs. I mean they will play it, but you won't feel much. I'd love to hear (feel) this at reference + in t18s, 4000 ulf, s2 , etc.


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post #104 of 137 Old 03-02-2017, 01:47 PM
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I can still feel my couch pressurize when the song plays but go up about five or six cycles, and then the whole entire house pressurizes, but then you're also in the port tuning frequency range


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post #105 of 137 Old 03-02-2017, 02:22 PM
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Quote:
Originally Posted by David Charles View Post
This is about the only song I've came across that really is too deep for 99% of ported subs. I mean they will play it, but you won't feel much. I'd love to hear (feel) this at reference + in t18s, 4000 ulf, s2 , etc. https://youtu.be/nb2qrGzN9YM


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post #106 of 137 Old 03-02-2017, 02:27 PM - Thread Starter
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Quote:
Originally Posted by albatros43 View Post
I've played this before and it's awsome! Hits hard at 10 and 14hz if I remember right
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post #107 of 137 Old 03-03-2017, 09:22 AM
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Quote:
Originally Posted by newc33 View Post
Not really bud, it's just a subwoofer video thread and iv posted a few...

If it were a subwoofer excursion thread I would agree.

My subs aren't made for excursion man... they are designed quiet the opposite actually. Even at max it won't be impressive compared to most people here.

They might not move as much but damn they sure sound good
I just did the math
your quads are pushing a surface area of 21.2sq ft or 3053.64 sq in.
they don't need much excursion.
The math also says your nuts, but you know that already!

I really want to hear what that system does, but I am in the wrong country, turn it up I can probably hear it from here.
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post #108 of 137 Old 03-03-2017, 09:54 AM - Thread Starter
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Quote:
Originally Posted by littlefoott View Post
I just did the math
your quads are pushing a surface area of 21.2sq ft or 3053.64 sq in.
they don't need much excursion.
The math also says your nuts, but you know that already!

I really want to hear what that system does, but I am in the wrong country, turn it up I can probably hear it from here.
Nice I haven't done the math myself so I appreciate that.

You got it man listen for earthquakes around 6pm central time lol

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post #109 of 137 Old 03-03-2017, 10:34 AM - Thread Starter
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Quote:
Originally Posted by David Charles View Post
This is about the only song I've came across that really is too deep for 99% of ported subs. I mean they will play it, but you won't feel much. I'd love to hear (feel) this at reference + in t18s, 4000 ulf, s2 , etc. https://youtu.be/nb2qrGzN9YM


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How do your amps feel after playing curtain shaker at that volume? I would imagine if you listen to that whole song that loud you will get some heat rolling in that amp

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Quad PSA T18s!!!!!!
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post #110 of 137 Old 03-10-2017, 03:30 PM
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Could this be anymore reason to switch to projection? So I get home from work tonight and crack a few Summer Shandy's and turn on some rap music, I settle on a song with some deep bass called "Rack City."

As I am sipping my beer, I notice that my TV is lighting up with white spots when the deepest bass line in the song hits. Granted my sub-woofer is flanking my TV like so many peoples do and I am on a concrete floor, but I didn't expect my TV to take so much punishment.

Is this HORRIBLE for my TV? The problem is, this is the BEST spot in my room for my sub (verified) so I hate to move it. Additionally, I like to jam out so I don't want to be volume limited, but at the expense of my TV, I would

I went on to the Bass Mekanik tone pack and found out that the TV ONLY shows white spots at 28-30 hz but the 28 hz tone is the most significant. Admittedly, I am new to home audio so maybe this is normal.

Dave
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post #111 of 137 Old 03-11-2017, 05:54 AM
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Here is my video... also my channel has games and such...

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post #112 of 137 Old 03-11-2017, 09:07 AM - Thread Starter
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Quote:
Originally Posted by David Charles View Post
Could this be anymore reason to switch to projection? So I get home from work tonight and crack a few Summer Shandy's and turn on some rap music, I settle on a song with some deep bass called "Rack City." https://youtu.be/7zUpo6XA-bY

As I am sipping my beer, I notice that my TV is lighting up with white spots when the deepest bass line in the song hits. Granted my sub-woofer is flanking my TV like so many peoples do and I am on a concrete floor, but I didn't expect my TV to take so much punishment.

Is this HORRIBLE for my TV? The problem is, this is the BEST spot in my room for my sub (verified) so I hate to move it. Additionally, I like to jam out so I don't want to be volume limited, but at the expense of my TV, I would

I went on to the Bass Mekanik tone pack and found out that the TV ONLY shows white spots at 28-30 hz but the 28 hz tone is the most significant. Admittedly, I am new to home audio so maybe this is normal.

Dave
I see you have that tv wall mounted. Would you be okay with the idea of just using it's stand and setting it on the entertainment center? I'm sure this would solve your problems, especially with a concrete floor. Your walls are just vibrating so much in and out that is putting pressure on the screen. Even with my t18s I never see any distortion in the tv at any volume and mine is on the stand.
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post #113 of 137 Old 03-16-2017, 10:36 AM
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After seeing @lz7j 's BHS vid.... I don't think I'm using my HS24mk2's correctly - they hardly move at reference (even though its ridiculously loud)
...Im guessing 1/4" travel at most....

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post #114 of 137 Old 04-29-2017, 08:21 PM
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Quote:
Originally Posted by eng-399 View Post
There is no way you are hitting 130dbA. Your mic cal is way off. Just sayin...
Your video starts at 86dbA, that's not something that can be easily talked over.
Your mic is about 36db hot I figure.

With 50kW and 16subs, I hit about ~100dbA continuous. (Which is ~15db over THX.)
100dbA is nuclear loud, dude.
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post #115 of 137 Old 04-29-2017, 08:36 PM
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dbA rating wouldnt be my preference for movie theater sound.

https://en.wikipedia.org/wiki/A-weighting

but if thats what you favor, some say 100dbA is same as a lawn mower outdoors...not impressed.

here is a calculator for comparing a vs c

http://www.sengpielaudio.com/calculator-dba-spl.htm

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post #116 of 137 Old 04-29-2017, 09:01 PM
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Here is some random dude measuring a chainsaw. He is measuring at about 12inches instead of 39inches (i.e. 1m), so you have to subtract about ~7db.
Giving: 92dbA at idle and 114dbA at full RPM (at about arms length).

My mic was at ~3m, so you have to add 10db to get 1m. I hit a max of ~107dbA, so that's 117dbA, about 3db louder than the chainsaw.
About as loud as two chainsaws at full RPM at slightly more than arms length.

To calibrate your SPL meter to dbA, I'd recommend getting an external mic and confirming that REW and it matches with a 1khz sinwave. Say 70dbA for the sake of keeping your hearing.
Then you will get a proper SPL reading from REW.


dbA is for measuring tweeters and mids.
dbZ is for measuring mid-bass and subwoofers.

I recommend using dbA for measuring speakers and dbZ for bass. (Or dbC + ~6db for meters that can't do dbZ.)

The TermLab and SPL Lab are dbZ(S)-Max by the way. Similar to a properly calibrated UMIK for dbZ(S)-max (i.e not dbZ-peak which is often 10db louder.)

The UMIK maxes out at 120db-max or 130db-peak.
The TermLab and SPL Lab maxes out at >180db-max so they are ideal for measuring hyper-loud subwoofers.
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post #117 of 137 Old 04-29-2017, 09:22 PM
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Quote:
Originally Posted by BassThatHz View Post
There is no way you are hitting 130dbA. Your mic cal is way off. Just sayin...
Your video starts at 86dbA, that's not something that can be easily talked over.
Your mic is about 36db hot I figure.

With 50kW and 16subs, I hit about ~100dbA continuous. (Which is ~15db over THX.)
100dbA is nuclear loud, dude.
https://www.youtube.com/watch?v=d-6D1YgisJg
So with your 16 subs in your room you only hit 100db on average and peak at what? You should be way above that you have some big amps and subs in your HT room. As for my video that was taken a while ago I might of had my 4 LLT's playing along with those 8-12's I don't remember. I wish I could take back time and see if the cal file was loaded oh well no biggie. I'll load some videos soon with my 4-21's playing that should be fun.

As for my mic I use a SL Umn-6 mic that's calibrated from them

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post #118 of 137 Old 04-29-2017, 09:35 PM
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As a reference point:
When I went to JBrown's I brought my TermLab.

His room is like what? 2000cuft or whatever, and he has 4 Full Marty UXL-18's and two nu6000DSP's.

With the cones each doing ~1 to 1.5inches of excursion, we hit 113db @ 18hz @ ~3m on HTTYD end-scene.



Our first attempt at it we only hit 106 @ 24hz, which is near the noisefloor of the TermLab.
Realizing this I cranked it a bit more. Giving the above score.

1inch is nothing for the UXL's, obviously it had more in the tank,
but I didn't push it cause it ain't mine... (and we didn't particularly desire cops showing up, etc. )
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post #119 of 137 Old 04-29-2017, 09:43 PM
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Here's 4 LMS-18's with 10kW @ 2-ish ft.

It hits 117db @ 10hz @ 100% THD (5th harmonic), and about 120db @ 10kW.
(There was about near-0% THD when I first started the vid.)

Here is one LMS-18 getting 4kW with Bass I Love you, near-field. Those 7Hz tones are hitting about ~70mm's P-P here (out of 80mm's):

The TermLab is calibrated at the factory, it's solid-state, no moving parts, no mechanical limits and nearly impossible to tamper with. If it says you got X spl, then you got X spl at that distance. Which is kind of nice, no calibration needed and you know the numbers are legit.

I also double checked my CM-130 and UMIK and TermLab, they all match each other. Further confirming that my SPL numbers are accurate. I recommend the CM-130 as a handheld, it's pretty accurate, though limited to dbA or dbC (dbZ handhelds are expensive as hell!)

The UMIK itself hits like 10% THD by itself at around 120dbZ(S)-Max; and minimal THD at 115dbZ, so I recommend not running THD sweeps with it higher than that.

The TermLab and SPL Lab being solid-state, has no mechanical THD, all the way to >180db.
(But they do have noisefloors.)
I wouldn't trust the TermLab below 105db, it's too noisy down that low.
At least the V2 analog version I got, the new Magnum digital is supposedly better at low SPL stuff.

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post #120 of 137 Old 04-29-2017, 09:45 PM
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Just my focals at 12-13ft. it was distorting too much....this meter was calibrated with rew/umik at 90db...but who knows after that

attached rew with just 1 sub in bad spot
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Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5, Magnepan LRS
Subs: Rythmik FV25HP, Rythmik FV15HP
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