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Old 7th December 2015, 09:07 AM   #1
TobiasZ is offline TobiasZ  Austria
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Default We built something mobile

My brother and me built a bike-trailer for taking our music nearly everywhere. We took apart a pair of old yamaha speakers and a car subwoofer and constructed a chassis made of formwork panels which are normally used for making concrete molds. It's quite heavy but this also means it doesn't move a millimeter when played at high volumes.

regards,
tobias
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Old 7th December 2015, 10:51 AM   #2
xrk971 is offline xrk971  United States
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Nice! Love the design - angular panels like a military stealth tank only in yellow. I like the pop up DJ workstation too. More details please.

Drivers amps etc. what exactly are the panels made of?
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Old 7th December 2015, 11:44 AM   #3
TobiasZ is offline TobiasZ  Austria
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Default some details

hi xrk971, glad you like it! I attached some pics with details.

We are using a Hifonics Zeus amp Type Zxi 4404, rated 4x75 watts. It powers the two high-/midrange speakers and the sub (two bridged channels).

The panels we used are called doka 3-so, they are very widespread here in europe. i'm sure you have similar panels in us. its plywood made of three layers, glued and clamped together and coated with a robust layer of paint.
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Old 7th December 2015, 05:23 PM   #4
zman01 is offline zman01  Bangladesh
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Cool project TobiasZ. Like the concept and the execution. Have fun!
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Old 7th December 2015, 05:30 PM   #5
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Excellent results Tobias. Tell us, what is inside the enclosure between the two mid/hi speakers?
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Old 7th December 2015, 05:43 PM   #6
TobiasZ is offline TobiasZ  Austria
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Thank you all! The space is just a storage for the cables and some other stuff. Under the base panel we built another box which is open on the back side. The sub enclosure is built as a bass reflex system and has its port in the base panel which leads the soundwaves to the back, where the high/midrange speakers are mounted.
When driving, we can store the tripods in that bass box.

BTW: The battery has 52Ah and powers the system for about 3 hours at 2/3 volume. And the power is really awesome.

Sorry for my english, i hope you can understand what i mean.
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Old 7th December 2015, 07:32 PM   #7
chrisb is offline chrisb  Canada
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Tobias - not only is your English better than many native speakers posting here, but this is a pretty cool build. Is there another bike trailer with small beer fridge and propane barbeque grille?
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Old 7th December 2015, 07:47 PM   #8
xrk971 is offline xrk971  United States
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This takes the term boombox to a whole 'nother level.


I have to ask - what is max sustained SPL level at 1m? What is bass extension f3 in Hz?
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Old 7th December 2015, 08:07 PM   #9
zacster is offline zacster  United States
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Can you power that with a dynamo hub? 6v/3w is all you need, right?
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Old 7th December 2015, 08:36 PM   #10
chrisb is offline chrisb  Canada
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more likely to be 12V, and car audio amps generally need more than just a few amps to deliver rated power -it's not uncommon to see at least 40A at 12V - this guy I think comes stock with 60A fuse.

3 watt supply @ 6Vwould probably hardly turn it on
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