Hey you sound geeks, I'm looking to build a new Boom Bike and would like to run all this past you. Please comment and help me out. : )
Goal: A compact, well balanced, light weight, energy efficient sound bike with stable well made components that can take the road. Cost? No expense limit but less is always best.
Shopping List So Far:
Folding FrameCubage about. 140 Liter.Specially strengthen Bottom.Trailer Weight: 35lbsMax loading : 180lbSize: 31.5x24x14inch (LxWxH)The size of the tires are 20"(Diameter) x 2.125"Length with drawbar is about: 54inchPackage Size: 28x22x14inch (LxWxH).
Price: $219 each
Weight Unpacked: 31.31 lb(14.2 kg), Width: 21-1/2", Height: 28-3/4", Depth: 17"
Specs: Two-way sound reinforcement enclosure 400 watts program, 800 watts peak 8 Ohm One 15inch woofer with 2.375inch VC and lightweight neodymium magnet RX14 compression driver with a 1.4 inch titanium diaphragm 1 inch exit 90 x 40 degree constant directivity horn Tweeter protection Heavy-duty crossover Lightweight molded polypropylene enclosure Molded-in pole mounts system Heavy-duty metal grille.
Price: $44.00 each
2x 100 watt amplifier board integrates Tripath's high performance TC2000 and TP2050 chips. Powered by any DC voltage from 10V to 32V, this high efficiency design is capable of driving 4 ohm or 8 ohm speakers with up to 100 watts per channel. Volume control can be implemented via on-board DIP switches. An auto fan control function optimizes thermal management.
Possible Efficiency Modification: Is to remove the crossover in the Peavey PA speakers and install the Sure amp as instructed here. This may be a later project if I find I am loosing a lot of power. So it's possible I will only be using on Sure amp during initial phase.
The best 800w amp I have found may or may not a be a digital amp it's rated Class FD which I assume means it's a push pull digital amp. But I don't really know. It seems to be efficient and I would totally go this route if it meant I could push the power I needed.
Two of these look like they could push the power I need. Any thoughts?
130 dB dynamic range, bandwidth ranging from below 10 Hz to over 200 kHz and up to 60 dB of gain and a +48 volt phantom power supply.
Batteries, I really honestly cannot make up my mind. Again cost is not an issue only capacity, weight and how many I need to buy to get the amount of power I am requiring. When I do the crude math I think the Shorai $176's are the best option but I am not sure.
Power supply, again totally cannot make up my mind. In fact I am sorta at a loss how I would have both AC/DC power... All the inverters and supplies I have found don't seem to offer this option. Any thoughts?
And finally, how the hell am I going to fit all of this on the trailer? It's possible this is such a large setup that it would be unstable if I tried to modify the trailer design of the AOSOM. This may require me to build my own trailer but I have no metal working skills so I would have to outsource this. Anyone know of a good, and not busy as hell, metal worker?
Here is my rough sketch of what the trailer will have to have...
Did you try UV?
Spencer "Thunderball" Thayer! said:
I have a radio show from 4-6:30 every Friday. I couldn't get anyone to fill that spot so I had no choice but to skip the mass. Otherwise y'all would have at least seen my boom backpack. Regarding the Boom Bike 4.0, Nope. I have the speakers, got the batteries, the inverter and everything else I need. I simply cannot find anyone reliable to construct the trailer. Everyone is busy or a flake. Talking to one guy. Seems like he can do it. Might have it ready for Midnight M but that is the kind of ride you don't take a trailer on.
Looking at your drawing and knowing the size/weight of your speakers, I'd either add more bracing or go with very large diameter tubing. Especially for the tongue. You don't want any flex or it will impede handling and likely lead to rapid failure.
Tell who ever does the construction your planned use/load and they should be able to suggest ways to make it strong enough.
Good info. I wondered what caused the ride to pick up so much speed at that point.
I was disappointed to see so much of the mass had bypassed Albany when we came out on Fullerton.
I'm going to try to bring my trailer next month, if I see signs that there's some investment in keeping the mass from turning into a race.
James Baum said:
I must have missed the briefcase system. I like to move around and see all the bikes and equipment out there. I often start at the front and cork at least once just to see everyone, but this month I started in the back and tried to move to the front of the pack but met a situation once where I really needed to help cork as someone was having a difficult time with an asshat. Then I needed to stop and adjust something on Logan and try and call my wife to come out and wave as we went by the house which blew some time. So I cut the clusterfrak that happened on Kedzie when the group tried to go through that tight street (Albany maybe?) and tied to get up to the front but the cops up there were being total asshats pushing the leaders to ride too fast and not letting them stop and mass up. So when everyone cut off the head of the ride by going through the park I doubled back.
There might have been a few bikes I missed.
I saw one girl with a small ipod dock radio clipped through her backpack with the ipod dangling out of it. Don't know what kept the ipod in the dock without falling out.
Spencer, are you still interested in a bike speaker system? Check out bikebeatz.com. I build them in Lincoln Park. I'd be happy to let you try one out. Let me know if you have any questions. Thanks! - Jimmy