Ok, this is getting absurd, 60KW of subwoofers in a truck.

[BrianHG]

  Ok, this is getting absurd, 60KW of subwoofers in a truck:

[rx8pilot]

What? Speak up!

Never knew it was so fun to lose your hearing.

[Bud]

I hope they not run it while driving as it seems to put quite a resonant stress on the vehicle, which may disintegrate one day in the middle of the highway if they do.

[BrianHG]

I hope they not run it while driving as it seems to put quite a resonant stress on the vehicle, which may disintegrate one day in the middle of the highway if they do.

   
We need to visually figure the resonant frequency of that truck, and feed that guy a virus .mp3 song with the tone at a random spot for the right amplitude and frequency... Kaboom...

[Red Squirrel]

That's a ludicrous amount of power.  Zero practical use but pretty crazy.  Just the cooling fans of all that amp/power equipment makes it sound like a data centre in there lol.

[John B]

Just keep in mind that in a world of peak power bragging rights, the average power is a far more modest value. Even then, expect the definition to be stretched to the limit. It's like shorting out a big cap and saying its 60kW.

Just for comparison, here's a 60kW genset:

[raptor1956]

I've never understood the need to dick wave how much audio power you have and that much power in a vehicle of that size is about 3 orders of magnitude beyond anything you could safely use in that space/volume. 

Years ago I was driving along a country road when I came upon a small car with smoke billowing out of it so I stopped to see if I could help.  The driver was a young guy of about 21 years of age and he explained that he'd just installed an audio system and this was his test ride with it.  I asked how he powered it and he explained that he'd wired it directly to the battery so turning the car off would not cut power.  I had him pop the hood and discovered some 18ga or smaller lamp cord connected to the battery so I grabbed one of the wires and was able to yank it off with one tug.  I few moments later the smoke began to die down.  Turns out he'd used this same lamp cord throughout and the smoke was coming from carpeting that was being heated by the wire.  Who knew that high power and low voltage spelled even higher current and that running high currents with small gauge wire would be a problem -- certainly not this Einstein of a kid.

About 5 minutes later the fire department arrived but the smoke/fire was out.  Maybe I should have watched the car burn to the ground.  Wonder if insurance would cover the loss if the work was done by an idiot without regard for the safety implications.


Brian

[raptor1956]

Just keep in mind that in a world of peak power bragging rights, the average power is a far more modest value. Even then, expect the definition to be stretched to the limit. It's like shorting out a big cap and saying its 60kW.

Just for comparison, here's a 60kW genset:

True enough, but then a pro grade camera flash unit can output about 100kW while studio strobes can do as much a 1MW.  Of course we're talking less than a millisecond pulse duration.  That that kind of power can be provided by a battery powered unit running on 4-AA batteries/cells is pretty amazing.


Brian

[BrianHG]

Just keep in mind that in a world of peak power bragging rights, the average power is a far more modest value. Even then, expect the definition to be stretched to the limit. It's like shorting out a big cap and saying its 60kW.

Just for comparison, here's a 60kW genset:

His setup looks like 4x 370 amp 13.7v alternators +  6 truck batteries plus a bunch of additional super-caps.

4x370x13.7 = around 20000 watts sustained.

6 batteries at 250 amps for around 4-5 minutes, = 20000 watts for around 4-5 minutes before drain begins.

So I say, for a few minutes, it is possible he can drive 40000 watts.  With the super caps, around 5 seconds at full 60000 watts.

Long term, he can only sustain 20000 watts if he can keep those alternators cool, but, not the way they are stacked together.  They'll overheat and fry.


And by the way, those 4 alternators would drag around 30-40 horsepower from the truck motor.

[John B]

I'm not doubting it's a lot, but still I remain cautiously sceptical. For starters I'd like to see all the wiring and connectors. My experiments trying to run a couple of kW off 12V have shown me how hard it is pushing around hundreds of amps.

[BrianHG]

I'm not doubting it's a lot, but still I remain cautiously sceptical. For starters I'd like to see all the wiring and connectors. My experiments trying to run a couple of kW off 12V have shown me how hard it is pushing around hundreds of amps.

It's shown in the video.  Look at that huge steed buss bar in the trunk with all those 2 gauge wires running in parallel, with the super caps just behind them.  He says all his batteries are all mounted under the amps at the bottom of the truck.

The generator you pictured is quiet, cooled, designed for continuous activity under full load and multitudes of circumstances holding 50/60hz ac sinewave with a large fuel tank.  What this guy has done with his truck is unsustainable long term, but, with music, he only demos the system for a few minutes at a time with the motor revving.  It illustrates though he can hit some note at full power and plow through a song with bass lines up in the 40kw range, it cannot be sustained.  But what he has is more real than those Aliexpress/Amazon 4kw sub-woofers with a small amp the size of a shoe-box.

[BrianHG]

I just re-listened to the video where he describes his hardware.  I think he said he is using lithium batteries???  Can anyone else confirm, I cant hear clearly over the fans.

Seek to 22 seconds into the video...

[vk6zgo]

There is also the quite definite possibility that he lies on his teeth.

[wraper]

With those 84db low sensitivity speakers, on top of that without a decent box, it's easy to make 60kW sound as loud like 6kW or even less on good speakers  . The measure their dicks power, yet it's not even representative of how loud their setup is.

[BrianHG]

With those 84db low sensitivity speakers, on top of that without a decent box, it's easy to make 60kW sound as loud like 6kW or even less on good speakers  . The measure their dicks power, yet it's not even representative of how loud their setup is.

Ahhh, so he has a good old 1-2% electric power to acoustic power efficiency...
I may personally have really good efficient 250watts/channel stereo, but, I still cannot even approach the breeze and vibration that guy is producing...

[coppice]

When turning up the volume on the stereo seriously affects the vehicle's gas mileage you've gone too far.

[BrianHG]

When turning up the volume on the stereo seriously affects the vehicle's gas mileage you've gone too far.

  I needed that...
BTW, lets install this system in a tesla roadster and shorten it's range a few fold, or, watch it slow down with every bass beat...

[wraper]

Ahhh, so he has a good old 1-2% electric power to acoustic power efficiency...
I may personally have really good efficient 250watts/channel stereo, but, I still cannot even approach the breeze and vibration that guy is producing...

It's just need to be low frequency and confined space to get that vibration. They are basically sitting within a subwoofer so it looks impressive. But actually it's not THAT loud as you might think.

[dmills]

Do NOT underestimate that efficiency thing, 84dB/W is crap by the standards of decent PA kit, which is typically 20dB better then that (My Nexo Apha rig was 107dB/W @ 1m, but rolled off hard below about 40Hz or so).

20dB is 100 times the power, so 40kW into 84dB/W speakers is only as loud as 400W into the good stuff.
Now the good stuff is typically large with very large and complex enclosures and is **Expensive** but less so then 40kW of power amp and all the supply cables and faffing about that goes with that.

It typically also does not go stupidly low (There are exceptions), the tradeoff being made in car stuff being massive low frequency extension into a closed cabin Vs efficiency in a box radiating into an acoustically large environment.

For really silly stunts see the Americans CB Burnoffs, redneck but you have to admire how far they can push it.

[drussell]

Dude needs more efficient speakers!...  LOL

A couple decades ago, I hit 136 dB in an SPL competition with just 360 watts RMS.  Of course, I was using two of my 2 x 18" bass bins (which are >102 dB @ 1W/1m) from my PA system in the back of my van.

Really ticked off the guy that had spent about $5000 on Phoenix Gold amplifiers and Dr. Crankenstein subwoofers to have me roll in there with a couple $129 Pyramid PB-300G amps and two PA speakers.  I beat him by 2 dB in a head-to-head tie breaker.   

We just did it for a lark.  A high school friend had noticed that there was a competition coming up and mentioned to me "Hey, how loud do you think your van would be if we put two of your bass bins in there?  Here, borrow my amp." 

Ahhh...  what fun... 

[Fryguy]

This is a really crappy setup in this car - I worked with a group of car audio nuts for a couple of years and started with my own car at a car hifi competition in 2006 . No , my ears are fine - i started in a sound quality competition with a total of 740 W RMS @ 4 Ohms - not SPL (Sound Pressure Level) .
So i have seen a lot - windows blown out of cars , concrete filled car chassis , car doors bolted tight with 24mm screws 10 cm spaced around and much more .

Have you ever heard the entire roof of a 4000 sqm trade fair building rattle because someone forgot to close the door on a car . . . there's a lot of fun in this . 

Let's see - there are 8 power amps SunDownAudio SCV-7500D rated at 1750W 4Ohms , 3500W 2Ohms and 7500W 1Ohm - if they are analog amps @ 4Ohms they will need about 300 A each for that or about 175 A if they are class D . For 7500W @ 1 Ohm class D they need about 750 A each . The power terminals take about 50 sqmm each pair - x3 = 150 sqmm - good enough . This might actually be real . . . 

I can't see any fuses installed in this car - great work !  We use 500A fuses from electric forklifts for this kind of installation .

The amps are rated to work up to 15,5V so a 4-cell LiPo set might really be installed under the car .

Some SPL-nerds at the car hifi show here used 8 single cell solar batteries in series running the amps @ 16V ! 

Anyway - this car moves a lot of air - really loud is something else .

[BrianHG]

Anyway - this car moves a lot of air - really loud is something else .

I just love that orange/white beach towel at 10min 10sec into the video, in the window.  It just looks so cool.

[Fryguy]

Yes that looks nice - a cavemans oscilloscope   

A few pics from my car hifi time . . .  No , i never made anything like this !

[bob225]

60k watts peak maybe (edit. 20-28k rms), 2000w is enough to rip steel panels and/or crack glass, exo would be proud

I wonder if they bbq off the amps heat output 


I do like SQ setups, I use to run alpine pdx amps, rainbow comps and a 12" alpine type-r, But my tastes have changed and its all about the OE look with everything hidden

[schmitt trigger]

You people do not understand!
If you face the subwoofers rearward, they will add to the thrust provided by an aircraft grade APU that powers the contraption.
That will cut at least a second from your standstill-to-100Km/hr acceleration time.

I hope people realize that I am joking.