Jivemaster Posted December 29, 2015 Posted December 29, 2015 I'm building a project over the next four months which needs an audio mixer say 2 mic and two stereo lines in, PFL and balanced line out. This is easy to source until I look for something that will work from 24v DC or 12v at a pinch. 1/ Can anyone suggest a mixer that takes a 12/24v DC supply please? 2/ How much output cable would you use before needing line drivers? -I'm planing to have 100m on a reel. Initially I want to avoid inverters for the risk of added noise.
Robin Pratt Posted December 30, 2015 Posted December 30, 2015 What's your budget? If you've got very deep pockets then the location recording mixers from Sound Devices or SQN will run from internal batteries or external DC supplies.Also , they're built like tanks. Available from Canford amongst others. http://www.canford.co.uk/Portable-mixers-and-location-accessories
sandall Posted December 30, 2015 Posted December 30, 2015 The small Soundcraft & Behringerr mixers use low-voltage AC supplies, but anything that uses a wall-wart PSU with a 2.1 or 2.5mm coax connector should work off a 12v battery.You probably won't get phantom-power, though I still have an old Audio Developments "portable" mixer that works down to 12v..
bruce Posted December 30, 2015 Posted December 30, 2015 Any small budget mixer was my initial thought too - but I had a look, and very few seem to run off a standard wall-wart. Most seem to be 14-0-14 or 18-0-18 supplies, or similar. Now here’s a slightly bizarre alternative - the Numark CD-MIX is a dual CD unit with built in tier. It’s got at least 1 mic input, and I’m sure it has balanced outputs. And it runs off 12V. No idea what your application is, but if it’s CD sources, then this might be a possibility... To answer the other part of the question - if it’s a balanced input and output, at line level, 100m should be absolutely no problem.
Dave m Posted December 30, 2015 Posted December 30, 2015 Is this for operation or fit and forgat?A couple of ART small boxes might do it, but they would need to be one box for mics and one for the line level, combined
MarkPAman Posted December 30, 2015 Posted December 30, 2015 Behringer do this little mixer which can run from 2 x 9V batteries (3 if you need phantom). I've no idea how the batteries are wired, so don't know how difficult it would be to get power from your 24V source, but it should be possible, if the 9V batteries themselves are not a useable option. Like most small desks, there's no PFL, though hooking the aux up to a headphone amp (also available in 9V flavour) could be a work around. Edit: Should point out that the outputs are unbalanced though :(
Jivemaster Posted December 30, 2015 Author Posted December 30, 2015 It's for a briefcase in a field set up with laptop and slow 485 (as distinct from DMX!) for the laptop to play music with cues for the firework firing system, however I need the facility to use a mic or two and send a line out to PA or a PA contractor.
david.elsbury Posted December 30, 2015 Posted December 30, 2015 Unbalanced outputs is super easy to fix- either use a Di box ( will drop to mic level though) or use a transformer, or something like an ebtech hum eliminator.
Jivemaster Posted December 30, 2015 Author Posted December 30, 2015 My findings so far are that all the mixers I've looked at use 18VAC or multi pin psu's. At worst I'll make a mixer, mix all at line level passively then send out as a slightly hot balanced line level. Question for people who would normally expect to receive a feed for PA, Line level? Balanced or not? I'm assuming that given a line level it can be padded down to mic level if needed, I'd rather not send out mic level.
henny Posted December 30, 2015 Posted December 30, 2015 How about something like https://www.bax-shop.co.uk/analogue-mixing-desk/behringer-xenyx-302usb-pa-and-studio-mixer?gclid=CLrgjsjPhMoCFQn4wgod-XkNLw Powered off the laptop and you get a usb sound card too
TomHoward Posted December 30, 2015 Posted December 30, 2015 Are those 1002B really unbalanced outputs? We have a couple of those - manual says electronically balanced - they are TRS rather than XLR but should still be balanced. I can try one on 24V if it's helps but I imagine they probably tap out a couple of different voltages since it runs on two. The InterM PP9214 rack mixers and similar all run from 24V DC. Overkill on the size but if you can rack it instead it could work.
MarkPAman Posted December 30, 2015 Posted December 30, 2015 Well, if there's a laptop available already, then there's plenty of USB powered sound cards that will do the in and out, and software that can do cues, triggers and audio mixing.
TomHoward Posted December 30, 2015 Posted December 30, 2015 That's true - a fair few like the MOTO 828 will do analogue mixing between the inputs & outputs on the card as well for monitoring.
MarkPAman Posted December 31, 2015 Posted December 31, 2015 Are those 1002B really unbalanced outputs? We have a couple of those - manual says electronically balanced - they are TRS rather than XLR but should still be balanced. Hmmm. Manual I looked at says TS jacks for all in and outs. You are right, it does say balanced in the "spec" part of the manual, but I'm right too in the diagram bit! How confusing. Who wants to email them?
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