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Author Topic: Full aluminium Floating Stereo! Learned to TIG weld for this.  (Read 1415 times)
Smily
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« on: April 29, 2017, 09:10:40 PM »

1st Post!
No laughing at the welds.
38v LiFePO4 battery
Parts Express Digital amps.   100watts RMS per speaker  Sub at 300w RMS
B&C neodymium 15 sub
Infinity 6x9.  8 of them
other parts I dont remember.
Aluminium chassis ~15lbs     6061-T6  .063'' for top.  .080" for everything below the 6x9s
Battery ~15lbs
Rest of the crap ~50lbs
Total weight ~80lbs










« Last Edit: May 13, 2017, 01:57:50 PM by Smily » Logged
JDW1479
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« Reply #1 on: April 30, 2017, 04:59:44 PM »

Biggest wolfer I have seen on a river boombox.  When it hits, how does it affect the 6x9s?

Also, is that thing scorching hot after floating in the sun all day?

Would be pretty cool if you powder coated the entire thing.
« Last Edit: April 30, 2017, 05:15:48 PM by JDW1479 » Logged
Smily
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« Reply #2 on: April 30, 2017, 07:41:35 PM »

The sub is quite nice to have outdoors.   Everything sounds very nice and balanced well out past 100 yards.
The sub doesnt cause issues with the 6x9s as there are 8 of them to the one sub.  They easily handle the air volume.
This system easily overpowers standard cooler based radios and with far far better sound quality.   Having actual bass on the river really turns heads.

What you dont see in any of the photos is a ton of polyfill.   The enclosure is far too small for what all is in it.   Foam and fill effectively make the box larger.   The system sounds spectacularly bad without any foam or polyfill.   Bare aluminium is a horrific cabinet material.  There is foam dividers between each 6x9 to block sound coming out the back of each driver.

Cooling is not an issue as the aluminium is basically a giant heatsink.  I have also added a small computer watercooler which attaches to the bottom(which is in contact with the river water) of the unit and blows cool air to the top.   Its been out of the water in Texas 105f sun during sand volleyball and had internal temp of 160f and had no issues.

https://www.amazon.com/EVGA-Liquid-Cooler-Cooling-400-HY-CL12-V1/dp/B01N9X3HY1
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Ayebeehm aka Doug
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« Reply #3 on: May 01, 2017, 12:39:32 PM »

Do you have any vids of this guy in action? I'd really like to see it Cheesy
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Smily
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« Reply #4 on: May 01, 2017, 06:07:16 PM »

Do you have any vids of this guy in action? I'd really like to see it Cheesy

Not that I can easily upload.  I will have to dig them off of my waterproof camera.   Im going to be making some changes this month and will need to re-tune it. I will take a video then.
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Snoball
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« Reply #5 on: May 03, 2017, 05:04:51 AM »

This is amazing!!! I think this is the first "welded" contraption I have seen on this forum. I like all the large carabiners and the ability to latch on.

What size AH battery do you have and how long does it run?
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Smily
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« Reply #6 on: May 03, 2017, 11:52:54 AM »

38v 20Ah LiFePO4   760Wh   It can run at max volume for over 24 hours.

This thing is extremely efficient as all of the digital amps run directly off of 38v so there is no voltage conversion as with standard car amps.

This is something most dont realize with car amps.   In order to get thousands of watts into a speaker, a standard 12v car amp must boost the voltage up.  Over 100v in some cases.  This conversion adds a layer of inefficiency.   I have completely removed this step.   With digital amps this can mean a doubling in energy efficiency.
« Last Edit: May 03, 2017, 11:56:24 AM by Smily » Logged
JDW1479
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« Reply #7 on: May 04, 2017, 04:17:42 AM »

Where do you find these digital amps?
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Smily
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« Reply #8 on: May 04, 2017, 08:10:18 AM »

Im running 2 of these for the 6x9s:  https://www.parts-express.com/sure-electronics-aa-ab33184-4x100w-tda7498-class-d-amplifier-board--320-305


Main thing to note:  Because they have no internal voltage regulation they are fully dependent on what they are given.

The board says minimum power is 14v.  This will give you no where near the 100w its rated for.

To get the 100w you need 36v.

Power output (w/ 36 VDC power supply): 100W x 4 (6 ohms, THD 10%), 80W x 4 (8 ohms, THD 10%), 78W x 4 (6 ohms, THD 1%)

im driving over 38v for most of the batteries discharge curve which gets me well over 150w @4ohms.  I can easily destroy the Infinity 6x9s

My battery fully charged sits at 42v which is above the boards high voltage cutoff of 40v.   Usually takes about 5 min of just the sub running to pull the voltage down below 40v and the 6x9s kick in.


« Last Edit: May 04, 2017, 08:35:13 AM by Smily » Logged
Jonesy
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« Reply #9 on: March 24, 2019, 07:04:47 PM »

I like it-
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PARTY ROCK !!!!!!
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