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AcousticTheory
Приєднався 25 бер 2010
A complete mishmash of videos spanning many years where I, an older male autist, play with the many toys in my life. If this channel has a theme, it is that I have too much stuff. My field of greatest interest is audio and acoustics, and I also enjoy doing live sound, but I like many kinds of technical things.
Thunderstorm over Novi (less good quality, full storm)
I caught another thunderstorm over my apartment complex similar to the one I recorded previously; this one was also over in about 45 minutes. I had just come back from traveling and I was cooling my apartment down to the temperature I normally keep it at, so my air conditioner was running through this full video, which negatively impacted the audio quality, but many other air conditioners were running because it was a warm day. Also, a few times the wind was nearly strong enough to blow my tripod over. I hope you enjoy.
Переглядів: 94
Відео
Closed On Tuesday - "Under The Bridge", banter
Переглядів 87Місяць тому
Part of a performance by local Detroit/Auburn Hills band Closed On Tuesday, filmed at a private graduation party, where I provided sound. This was just before intermission, so some of the start of intermission is also filmed. Very relaxed environment and everyone had lots of fun.
Closed On Tuesday - "Bad Guy", "Dirty Little Secret", banter
Переглядів 130Місяць тому
Part of a performance by local Detroit/Auburn Hills band Closed On Tuesday, filmed at a private graduation party, where I provided sound. The atmosphere was relaxed and the band was having fun, as were the audience. 5:10 "Bad Guy" 10:12 "Dirty Little Secret" Lots of banter in between and in front.
Closed On Tuesday - "Come Together"
Переглядів 9010 місяців тому
Performed in my office's parking lot. I supplied the FOH sound. System is Renkus TRX121/9 over Community VBS112 (with upgraded DIYSG "Magnum" 12" woofers), power is Crown XTi2 series, and console is Soundcraft Si Expression. After this event, I decided a subwoofer upgrade was necessary, but there was enough bass for the parking lot (amazingly) from just two 12" subwoofers. The subwoofer grille ...
Portable Acoustic Hailing Demonstration (DIY LRAD)
Переглядів 1,3 тис.2 роки тому
This is a demonstration of a 4-cell column acoustic hailing loudspeaker I constructed (similar in concept to LRAD) being demonstrated on 100 watts from a battery powered amplifier. (The drivers can thermally handle up to 800 watts.) The design is focused on maximum output and clarity in the telephone bandwidth, from 400 Hz to 8kHz. The speaker is using 4x 2” exit, 4” VC compression drivers with...
Bose PowerProfile (Cadillac CT6) Bass Enclosure - CEA 2010 Bumps
Переглядів 1603 роки тому
Here's the Bose PowerProfile bass enclosure from the Cadillac CT6 playing 7-cycle shaped tonebursts (the same used for CEA 2010 subwoofer testing) at 20 Hz, 31.5 Hz, 40 Hz, and 50 Hz. Each toneburst track lasts about two minutes. These tonebursts are typically used for driving subwoofers to maximum burst output levels without causing the amplifier or woofer to experience thermal compression or ...
Bose PowerProfile (Cadillac CT6) Bass Enclosure playing White Clouds - Decaf
Переглядів 1713 роки тому
Here's a video of one of the two Bose PowerProfile in-floor bass enclosures from the Cadillac CT6 Panaray audio system, playing White Clouds, bass-boosted by Decaf. A subdued track with strong single-frequency energy; bass begins around 0:27 seconds in. You can hear how some tones are loaded by the port more strongly than others, as evidence of the energetic port action by this enclosure; the f...
Bose PowerProfile (Cadillac CT6) Bass Enclosure playing Woofer Cooker
Переглядів 2053 роки тому
Here is the in-floor Bose PowerProfile bass enclosure from a Cadillac CT6, playing THX - Woofer Cooker. (No woofers were cooked.) You can see the small 2.75" woofers working hard here, and you can hear port noise from feeding solid sub-sonic tones, but there was quite a bit more bass output in my room than what the video conveys; the woofers and enclosure play pretty well down to 40 Hz and even...
Bose PowerProfile (Cadillac CT6) Woofers - Hey Now
Переглядів 5203 роки тому
Here is a video of one of the four 2.75" woofers in each of the Bose "PowerProfile" under-floor bass enclosures in the Cadillac CT6, playing a section from "Hey Now" by London Grammar, a favorite bass test track. They are mounted in opposing, force-cancelling pairs in cast aluminum manifolds, which are then coupled to a molded plastic enclosure tuned to about 45 Hz, with a secondary resonance n...
Wednesday Morning Rain
Переглядів 363 роки тому
Filling up UA-cam with more rain videos. This is in the morning at my apartment complex. Vehicles show up toward the end (4:35), making noise, and a garbage truck is in the area. Too bad a nice rain like this had to happen on a Wednesday, which is trash day around here.
Rain Again
Переглядів 203 роки тому
Rain bazooka aimed at us today. Surprise nearby lightning strike at 2:37 (with nice warm yellow flash) and another one after that made me think again about being outside. Otherwise, just some nice rain. Video quality isn't the best, because something caused it to be a little out of focus.
Morning Thunderstorm at Apartment Complex
Переглядів 704 роки тому
If last night wasn't enough, it thunderstormed at my apartment complex again in the early morning. So I put the camera back on the tripod and set it out to catch the tail end. You also get to watch the rain end and the sun come out.
Thunderstorm at Apartment Complex (Full Storm with Timestamps)
Переглядів 9164 роки тому
This storm fit inside of 45 minutes, so here it is in its entirety. There were two downpours during this storm, and lots of lightning. My camera was on my balcony, under a small overhang that prevented it from taking direct rain. Also there was very little wind with this storm. No music or anything. I have the weather radio going at the start, but I shut it off shortly before things got going. ...
Before the Thunderstorm at Apartment Complex
Переглядів 554 роки тому
This is the preamble to the thunderstorm I recorded tonight. I was in and out of my apartment, adjusting the tripod, listening to the weather radio, etc., but there's some neat lightning in this one (check out the bolt at 3:45) that hopefully gets captured well enough. There was very little wind with this storm. It was a warm evening, so everyone's air conditioners were running, but I turned mi...
More Rain at Apartment Complex
Переглядів 164 роки тому
This is sort of like a re-enactment of the earlier video of rain at my apartment complex, watching rain from the same location, but it's a different rainstorm about a year later. The complex is located in Novi, Michigan, west-northwest of Detroit.
Desk Subwoofer - 1812 Overture (Finale)
Переглядів 1714 роки тому
Desk Subwoofer - 1812 Overture (Finale)
Tiny PA at 2017 Outdoor Party (In Reverse)
Переглядів 915 років тому
Tiny PA at 2017 Outdoor Party (In Reverse)
6x9 OEM Branded Subwoofer Excursion - HAM
Переглядів 1,6 тис.5 років тому
6x9 OEM Branded Subwoofer Excursion - HAM
3D Printed 2-Blade Fan with Wide Chord Blades
Переглядів 2,4 тис.6 років тому
3D Printed 2-Blade Fan with Wide Chord Blades
Piston Air Motor, 1/8 HP, 75 PSI test run
Переглядів 21 тис.6 років тому
Piston Air Motor, 1/8 HP, 75 PSI test run
FEDERAL SIGNAL 950B DIRECTONE LOUDSPEAKER (TEST VIDEO)
Переглядів 8226 років тому
FEDERAL SIGNAL 950B DIRECTONE LOUDSPEAKER (TEST VIDEO)
ATLAS SOUND SVT-78 VOICE/TONE SPEAKER (TEST VIDEO)
Переглядів 9476 років тому
ATLAS SOUND SVT-78 VOICE/TONE SPEAKER (TEST VIDEO)
ATLAS SOUND VT-157 VOICE/TONE SPEAKER (BETTER VIDEO)
Переглядів 9596 років тому
ATLAS SOUND VT-157 VOICE/TONE SPEAKER (BETTER VIDEO)
ahhhh, compressed air... some people mention steam, not really suitable unless you wanna deal with corrosion and babying it... and steam with all the safety valves and pressure gets a bit fiddly... but simply heating the incoming air, replacing that heat lost in compression and maybe adding a bit besides, does wonders for increasing output/reducing consumption. reasonably easy to do with a gas burner. only need to get 100C or so. the "ideal situation" is when the cylinder remains at slightly above ambient... cold is bad, cold is air not fully expanding, and attempting to absorb heat as it tries to expand. and unbearably hot is just a waste of energy, radiating away rather than adding to power by any appreciable amount. air may not have the thermal mass of steam, about half, but it doesnt have to experience a phase change with its invariable and unavoidable loss of 80%... without being able to vary the cutoff and expansive operation, it will mostly increase output and have relatively little affect on consumption though... "1/8 hp", but remember, thats just torque over time, and the torque is what counts... ie, Pressure, Length of stroke, Area of piston, Number of revolutions/min, all together, PLAN for HP...
Beautiful 💙
Rich sounds.
What tone module is that in the beginning?
It's just a no-name one from eBay. I don't know where it is now but you can find them with integrated power amplifier stages; I think this one was rated around ~3w of power.
can you please post a parts list?
The drivers are PRV D4400Ph-Nd. I used a 6" round exponential horn with a short flare; the ones I bought were from BlastKing. These components are sold for the crazy car audio constructions that are common in South America but they are well adapted to the use case of an LRAD-type speaker using the modular arrangement where an array of sources is built up to the necessary directivity and SPL characteristics that are needed. Also, any full range amplifier that can supply around 800-1600W into the load should provide excellent output; the one I bought to eventually use is 3000W but in this video I'm only using about 100W. Using more power might require DSP filtering to avoid overdriving the compression drivers at low frequencies.
Seems like 5 horsepower
The rating was only 1/8 HP, and I am sure my air compressor would not deliver that much.
Can volume be changed?
The VT-157 is just a loudspeaker; the volume is dependent on the level setting of the source audio component.
a
That is a nice apartment complex.
It has been pretty nice, though not cheap. I've been here about 7 years now, which seems like a long time, but I think the next step is buying a house, which could also take a while.
@@Acoustic_Theory that is always the end goal - best of luck brother!
I think it is a tornado alarm
It’s a lockdown alarm dumbass
It could be used for a variety of things. The mock message I used here was just because I needed something that would sound like a real alerting use case.
The sounds are very relaxing.
Such an insane excursion for a driver like that
Such an insane excursion for a driver like that
AMAZING song on amazing little drivers. I have them from Bose Videowave TV. Great video!
It's insane how these woofers were also used by Bose on their Videowave TV. Fantastic little drivers!
You need to use a lot of them together to get a useful amount of output, and normally in a cost-sensitive environment it's cheaper to use a single larger driver, if it can be fit into the available space.
Need a lot more details, links to the equipment you bought, etc. looking forward to additional details.
Tiny woofers doing tiny woofer things.
I like the sound quality in this video. The rain doesn't sound "off" like it does in so many storm videos.
I think the rain sound in many storm videos is 'sweetened'; this is just the camera microphone.
the bass is explosive ✨ 🔥😍
Hope you can show us how you made it, will be very interesting
You might be disappointed to learn how simple it was. I chose a compression driver and a horn that were well optimized for operating in the speech range, then I placed four of them in a column to get increased output.
The "Covid vaccination center" message is just an example use case scenario for this system.
hi . bass fane imperium xl ,mid beyma 12 mi 100 ,hi rcf 2 inch n 850.& my crossover activ schematic analogic 2 way plus my crossover pasiv.
Yep. (I think you meant to post this as an answer to my question on another video. If that's what you meant, then thank you.)
Price
Are these 4 subs opposed to each other?
Nice
What is price
Where was this storm?
Novi is in Michigan
LMAO
This is ..addictive..
The jazz at the end really makes it.
🤔🤌🤌 Interesting
Thanks for stopping by. Hope you enjoyed it.
I guess I'm here before everyone else.
Just ad a dobbel 12 box and one more of this kind and you got sound couch 😝
Berapa watt dan harganya pak.
Yes.
What psi is this capable of please.
It's not much. With a more powerful motor, its max is 6 psi.
Yes
How to buy it
I think this was from eBay
From where can I buy this motor.?
I think I bought this one on eBay
hmm this text to speech almost sounds like joey or something else so which text to speech you used for this particular message? was it from the mac text to speech?
That’s a Microsoft text to speech voice
Can this condenser be hooked up to a mini split system?
very cool
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I like the part where the dude goes inside.
I want buy this motor...pls send me details
I don't make or sell it but I think I bought it from eBay
Are you planing on puting this on something?
I'm getting a amr500 blower Powered by a 1/5 hp motor
Be sure to consider power loss in the belt drive also. If I had a 1/2 or 1 HP motor, I think it would be happier; right now the motor seems to run warm. I also have to investigate a possible issue with the upper bearing in my blower - right now it warms up to around 140-160 degrees F, which is not above the allowable temperature rise, but when I tried tensioning the belt to what seemed like a normal full tension, the blower overheated and began to seize (it was fine after a cool-down), and the motor bearings were also not happy. I loosened it a bit and it seems happier now but it has me concerned.
@@Acoustic_Theory I don't know much but its for my mini Thunderbolt 1000T and I *WILL* NOT run all the time But sometimes for tests or something
@@Acoustic_Theory good to know also can you do i tutorial on oiling it sense i just got one it would be very helpful
@@PeterLowenbrauGriffin- The original gasket that was on this thing since new in 1976 was no good anymore and wouldn't hold oil, so I had to make a new one. The guidance on oil filling is to take out both plugs and when the oil gets up to the lower one, that's all the oil it needs.
@@Acoustic_Theory so its the gasket for one of the oil screws right?
Right on
The belt needs tightening.
could you link them to a generator? Would it be strong enough to recharge the battery? I ask you why I'm conceptualizing an electric air hybrid
This would be too inefficient to run a generator to charge a battery; the volume of air needed would be enormous. You could use an air tank to store pressure from an air motor, then release it back to the wheels as a form of regenerative braking.
super
What is the price if this motor
so where is the drawing? hempopotamusloudspeakers.com. we specialize in TBH's.. I have these drivers so I'm curious. Thanks
Link is in the description.