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  • DIY "Street Party Bicycle Stereo" anyone can easily build with minimal tools

    STAY TUNED!it's FINALLY happening! i'm building the trailer system! it will, IN THEORY, have 500 watts or more, a SEALED 15" sub for a tight thump, but moving some air too, and even a sound activated light show!i'll be using a nice sounding xduoo x2 media player, thumb controlled on my handlebar & playing uncompressed WAVs driving a 4 channel planet audio BB1200.4 class D amp in bi-amp mode with the front channels driving a pair of nice sounding 96dB efficient proel flash 8P mains with the rear channels bridged to drive the (discontinued, right when i was ready to buy it) JBL GT5-15" sub in a 1.9 cubic foot acoustuffed box with at least one 12v 18aH AGM (little, but heavy!) battery for low powered/short run time use.that's the BASIC starter system, though. i'd like to add ...see more »STAY TUNED!it's FINALLY happening! i'm building the trailer system! it will, IN THEORY, have 500 watts or more, a SEALED 15" sub for a tight thump, but moving some air too, and even a sound activated light show!i'll be using a nice sounding xduoo x2 media player, thumb controlled on my handlebar & playing uncompressed WAVs driving a 4 channel planet audio BB1200.4 class D amp in bi-amp mode with the front channels driving a pair of nice sounding 96dB efficient proel flash 8P mains with the rear channels bridged to drive the (discontinued, right when i was ready to buy it) JBL GT5-15" sub in a 1.9 cubic foot acoustuffed box with at least one 12v 18aH AGM (little, but heavy!) battery for low powered/short run time use.that's the BASIC starter system, though. i'd like to add more batteries, or better yet, switch to much lighter and more expensive too lithium ion packs, a fiberglass sub box & frame, and possibly 4 x 12" or 10" subs for tighter bass and higher efficiency.regardless of whether in build the 2.0 version, it, or the 1.5 version will also feature either a white, or possibly grey nylon shell around everything that will be internally illuminated on the front, back, top & sides by 5 TSSS sound activated "LED sunflowers" (the one i bought DESTROYS a cheaper one i tested in every way) turning the system into a rolling light show unlike anything ANY bike system has done yet, with really nice sound quality, if not the absolute loudest and deepest bass, but with a nice tight thump.TSSS sunflower demo (the colors are even more saturated than in the video!)here's a pic of the basic components, of which i have everything shown, but no sub box yet.if the pic is lofi, here's a better version i can't get the forum to displayhttp://usr.audioasylum.com/images/7/71618/complete...

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  • zeroemission commented on dan's instructable Off-Grid Party Sound Systems5 months ago
    Off-Grid Party Sound Systems

    just look for class D amps. they're around 90% efficient where regular class A/B amps are lucky to hit 50% efficiency. to my ears, class D sounds better too with more speed & detail.i'm using a cheap planet audio BB1200.4 amp for my system instead of having to run higher voltages with sure bare class D modules and especially because it is configurable as a 2+1 bridged bi-amped system with built in HP & LP crossovers. it's heavy for a little amp, but solves a lot of problems i was having trying to make an active 24v+ system that would need another 12v circuit for a crossover adding weight and complexity and the need for another charger.

    building a "semi-efficient" bike trailer system. i'll be using a small pair of really nice sounding proel flash 8P 96dB 8" two ways as mains, an efficient planet audio BB1200.4 class D (nearly twice as efficient as regular class A/B amps) and a 93dB JBL GT 5-15 15" sub that will put more out at the bottom octave than high efficiency woofers which have fast rolloff under 70Hz, BUT will be tossing efficiency out the window some by going sealed, for sound quality and a nice tight thump, instead of porting which merely adds distortion to SIMULATE bass.version 1 won't be light either with at least 1 AGM battery, but in planning version 2.0, i'd like to lighten things up with fiberglass and lithium ion batteries as well as get some "free dB" by using 4 x 10"...see more »building a "semi-efficient" bike trailer system. i'll be using a small pair of really nice sounding proel flash 8P 96dB 8" two ways as mains, an efficient planet audio BB1200.4 class D (nearly twice as efficient as regular class A/B amps) and a 93dB JBL GT 5-15 15" sub that will put more out at the bottom octave than high efficiency woofers which have fast rolloff under 70Hz, BUT will be tossing efficiency out the window some by going sealed, for sound quality and a nice tight thump, instead of porting which merely adds distortion to SIMULATE bass.version 1 won't be light either with at least 1 AGM battery, but in planning version 2.0, i'd like to lighten things up with fiberglass and lithium ion batteries as well as get some "free dB" by using 4 x 10" or 12" subs for even tighter bass and possibly some extra bottom octave dB, but at least be able to move a similar or greater amount of air.in version 1.0, i'm balancing size, weight and cost just to get rolling ASAP. i have MOST of the system, but need a sub box, wiring, a circuit breaker, power meter, more batteries and to build a wooden frame to mount everything.EVENTUALLY, the system, whether i upgrade to fiberglass or not, will include a sound activated RGB LED light show.more than SPL drag racing, i'm building my system with an emphasis on sound quality. i could have theoretically lightened it up by using bare sure class D modules, but that would require a 24v minumum system where staying at 12v, i can add EQs or power inverters without needing a separate power supply.trikes and trailers are best if you want to build a really heavy and loud system.

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  • Add more bass to your speakerbox/subwoofer encloser on the cheap

    here's an article about "acoustuffing":http://audiojunkies.com/forum/blog/4777-ultimate-polyfill-subwoofer-enclosure-resource.html

    the general rule is to use 1 to 1.5 pounds per cubic foot of enclosure volume.i always thought pillow stuffing would be a cheaper alternative. you should see the prices some audio places charge for "blu-tak" which you can often get at dollar stores.i would have thought that "acousta-stuffing" would raise the Q of a speaker by limiting internal volume, but apparently, it has the opposite effect (provided you don't overstuff... it seems that 1 pound per cubic foot is better than 1.5 from what i've read) by making smaller (sealed especially) boxes "look" larger to your woofer by dampening back waves and lowering your f3 point.i've ordered a JBL GT5-15 for use in a 1.9 cubic foot box which actually is just short of the 2 cubic foot maximum recommended by JBL, b...see more »the general rule is to use 1 to 1.5 pounds per cubic foot of enclosure volume.i always thought pillow stuffing would be a cheaper alternative. you should see the prices some audio places charge for "blu-tak" which you can often get at dollar stores.i would have thought that "acousta-stuffing" would raise the Q of a speaker by limiting internal volume, but apparently, it has the opposite effect (provided you don't overstuff... it seems that 1 pound per cubic foot is better than 1.5 from what i've read) by making smaller (sealed especially) boxes "look" larger to your woofer by dampening back waves and lowering your f3 point.i've ordered a JBL GT5-15 for use in a 1.9 cubic foot box which actually is just short of the 2 cubic foot maximum recommended by JBL, but running the numbers, that produces a QTC of 1.15 where .707 is actually ideal. then when i ran the numbers for that QTC, i got an internal volume of 42 cubic feet! (about 4 feet by 4 feet square). on a graph, the bass definitely went deeper, but good luck buying an enclosure that big pre-fabbed.i'm going to try getting a couple pounds of pillow stuffing INSTEAD of using "egg crate" mattress liner as a poor man's acoustic foam to line the box with. pillow stuffing should not only be cheaper, but actually DEEPEN the bass and probably tame standing waves even better than mattress foam too and MAYBE even tighten the bass up by shrinking the air spring.so far, everything i'm reading says this is the way to go with a sealed box with a QTC over 1.0. thanks for verifying that acoustuff etc. is really rebranded pillow/teddybear stuffing.

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