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12v bike rig - Advice needed! |
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bfbs 
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Joined: 16 February 2013 Location: Germany Status: Offline Points: 3 |
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 Topic: 12v bike rig - Advice needed!Posted: 07 May 2021 at 9:29pm |
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Ground Loop....
It is a crazy think. On my Bike i have one audiosignal on 12V for the Sub Amp, one audiosignal for a littel mixing desk on 230v with a real transformer (galvanically isolated) ant a Opera 402D in an unknown Status. I mußt Isolate the Amp for the Sup to get no 50hz Noize.
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bfbs
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Posted: 07 May 2021 at 9:05pm |
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Moin.
I habe your project. 1 mbh118 / 1/2 EVMTL1 with Rcf L18S801 Carpower wanted 2x600 bridges. For 1kw @4ohm The Sub has 8ohm so only 500w go into the Sub. A swtiching Inverter for 230v pure sin1kw Any aktive top for the rest. Two agm with 95ah And you will have more than 6 hours Fun. I use this in two bikes paired with a guitar bug. Stereo for chritical mass... Runs in north oft germany. The weight is ca 120kg for the PA. https://werkstatt-lastenrad.de/index.php?title=Datei:20180525_210347.jpg I have build the Bike by my selve because there is no Seller of Cargobikes for this Load Volumen by weight. Bud You have a Trailer thats easyer to handle.
Edited by bfbs - 07 May 2021 at 10:34pm |
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Jack1991
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Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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Posted: 07 April 2021 at 5:48pm |
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Cool cheers Slaz, ground loop issues is another thing i have not heard of before. Ill have a look into that. I have just got a t.racks 12v dsp so have just been reading up trying to make sure im powering it correctly off a battery. Hoping the info helps CFLsound too
Edited by Jack1991 - 07 April 2021 at 5:51pm |
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slaz
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Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Posted: 07 April 2021 at 5:27pm |
Hmm .... well I can see how that might well be a problem with a lead-acid battery in less-than-optimal condition and/or near the end of its discharge cycle - and ragging the amplifier hard. I try (where possible/viable) to power ancillary bits of kit from their own batteries. We'd need to know the current consumption of the DSP .... I can see it would use a few watts - maybe somehting like 0.5A or so at a guess - so to play all day you might want 12V 5Ah or so. My 7-band car EQ (yeah, I know ... doesn'treally seem to degrade the signal though) uses about 200mA. I've always used a separate battery for that .... but its easy when (like me) you've built up a stash of various batteries over the years. BTW - it also neatly side-steps posible ground-loop issues. Edited by slaz - 07 April 2021 at 5:29pm |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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Jack1991
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Posted: 07 April 2021 at 12:39pm |
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Not sure if your planning on powering the DSP off the same battery as the amplifier? But i have just been told on another forum that doing that can cause voltage drop outs. Causing the DSP to lose power momentarily.
Edited by Jack1991 - 07 April 2021 at 12:53pm |
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studio45
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Posted: 06 April 2021 at 12:28pm |
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+1 for SX80's.
I don't know if you'e ever heard their ubiquitous 12" brother the SX300, but they were one of the best plastic speakers ever made. Just ASTONISHINGLY loud and tough as nails.
Assuming EV haven't let themselves down completely, the SX80's should be just as impressive. |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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slaz
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Posted: 05 April 2021 at 1:54pm |
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@ the OP ... I were you I'd be keen on those SX80. Reckon those would play nicely down to 100-120 or so. 10" and 8" (and even 6.5") are generally more optimal for vocal, guitar, KB ranges than 12s and 15s. Weight is 8.2Kg each, so 16.4Kg for the pair - and should lend themselves very well to mounting on sticks, shuftying around to suit the situation/dispersion etc. If you're not hell-bent on stereo, put both across a decent car amp channel (or bridged channels) for a 4R load - pretty much all decent car amps will work fine in 4R bridge. Oh yeah - and even if they don't work out 100% for your needs, they should be very saleable.
Edited by slaz - 05 April 2021 at 1:56pm |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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markie
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Joined: 31 October 2005 Location: Sunny Liskeard. Status: Offline Points: 4570 |
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Posted: 05 April 2021 at 11:40am |
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I have a pair of EV SX80s surplus to requirements. Good condition and all original drivers. PM if interested.
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If it's got wheels or tits it's gonna cost a fortune
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CFLsound
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Posted: 03 April 2021 at 11:42am |
So in regards to the bike the we are looking at a rickshaw/trike rather than a trailer. Our logic is that rickshaws often have two people on the back so one person weighing 65kg means that 130kg must be possible. Yeah it will be tough but my friend who is a bike nut reckons its doable. Also if we go with a modular speaker design we could also just go out with one sub and full range speaker and one battery if extra transportability is needed. We have some friends who are pulling 215kg of soundsystem on a trike at the moment. They do have an electric motor on the bike and this is something we are considering at a later date. I guess my needs on this forum are kind of outside the bike side of things anyway. I'm looking for a full range enclosure that can meet the thams nicely and that has clear plans laid out already so we can just build the things and get the tunes rolling. I think designing cabs is a bit beyond my realm of knowledge at the moment but its something i'd like to get into at a later point. Im also not sure I have the time to put into getting a really decent enclosure sorted! I have experience working with audio in a studio environment so working with the DSP and getting things sounding tight out and about is where im more excited to direct my energy. Unless designing the cabs isnt that hard and you guys reckon I should just give it a go? If someone can recommend any great driver and cab combos to go above the thams that would be wicked. Or are those B&C designs suitable? I like the look of them and it seems to me as if they will crossover into the thams nicely. The aesthetic is also a consideration. I like the stacked speaker/classic rig look so this is something I'd like to stay with. If we end up building more than we can carry on the tricycle then so be it, we can transport it other ways if necessary but carrying one sub and one mid top and one battery shouldnt be a problem at all. Keeping costs down is also a consideration and those neo drivers are a little pricey. Budget is £400 max for whatever goes above the thams.
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markie
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Posted: 02 April 2021 at 7:46pm |
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Yes, but it's twice the size and even with a neo driver probably a similar weight to the Volt cab. Plus it doesn't produce any bass so will need subs which will considerably increase the power usage.
For me the biggest consideration is the weight, If someone told me to pull 125kg trailer my response would be "On yer bike". The Volts would eliminate the need for subs and a processor so would allow for extra battery power and hopefully reduction in weight. It's another option. |
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If it's got wheels or tits it's gonna cost a fortune
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APW
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Posted: 02 April 2021 at 6:30pm |
The volts do sound lovely, however on a battery powered
system I suspect he’ll need something a little more efficient than a 90dB/w
driver. The B&C enclosure posted in the link above needs 1/5th of the power the Volt needs to produce the same SPL. Edited by APW - 02 April 2021 at 6:31pm |
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markie
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Posted: 02 April 2021 at 6:25pm |
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Yes, but I got the spec wrong, flat to 57Hz, -3db gives you 50.
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If it's got wheels or tits it's gonna cost a fortune
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Jack1991 wrote: