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12v rig problems..help |
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dan15550 
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Joined: 01 May 2015 Location: Bristol Status: Offline Points: 14 |
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 Topic: 12v rig problems..helpPosted: 06 September 2015 at 7:12pm |
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Hi
Ive just purchased a maxamp 20...wired it all up and the music is stopping and starting A video of the problem - https://youtu.be/2lOmaCUgtRk
my setup is a max amp, 12v battery, no power supply, eminence apt150, eminence alpha 8a and 3.5khz crossover Any suggestions? cheers
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mini-mad
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Joined: 13 July 2012 Location: london Status: Offline Points: 6903 |
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Posted: 06 September 2015 at 7:21pm |
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Wake the volume up and see if it still presists.
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If it sounds like a gorilla is trying to escape, turn it down.
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dan15550
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Posted: 06 September 2015 at 7:24pm |
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the louder the volume gets the more it skips
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lutkeveld
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Joined: 23 September 2013 Location: The Netherlands Status: Offline Points: 517 |
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Posted: 06 September 2015 at 9:02pm |
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Test with different sources and amps to single out the culprit.
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dan15550
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Posted: 06 September 2015 at 9:23pm |
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problem is ive no other amp, i have tried different sources and still the same outcome
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Offline Points: 378 |
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Posted: 07 September 2015 at 10:34am |
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What cable and how long to get + and - 12 V to the Maxamp, could the behaviour be under voltage due to power supply cable length / size?
I use 2.5mm^2 (max you can get in to the terminal) and its <200mm long. But as long as you using 0.75mm^2 or more and cables short <1m it should run OK, although 2.5mm is recommended... Dupe...
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Dupe...
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studio45
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Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Posted: 07 September 2015 at 2:22pm |
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I agree, it sounds like either the voltage at the amp chip is collapsing during loud bass notes and causing it to mute, or the chip is just faulty. If it is the first problem, much thicker and shorter battery cables should fix it. Do you have a multimeter? Ideally, the voltage measurable at the amp board's power terminals shouldn't dip more than 0.1v during a maximum-power bassline, or even less (but your multimeter probably won't be precise enough to read a smaller change....)
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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DJ-Dulux
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Posted: 07 September 2015 at 3:55pm |
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May also be worth driving the amp into a single eminence alpha 8a, cutting out the X over and tweeter. Maybe the X over is causing some issue in the amp?
Dupe...
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Dupe...
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dan15550
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Posted: 07 September 2015 at 8:28pm |
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Thank you very much for your replies. - I am using 1.5mm wire and a rather long length of it too, so that may be the issue. Im currently away in Birmingham till friday so ill have to wait till then to put your suggestions to the test. Ill let you know how i get on.
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dan15550
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Posted: 07 September 2015 at 8:30pm |
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To add i do have a multimetre, im not sure whether it is sensitive enough to test but i will certainly try.
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shagnasty
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Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7685 |
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Posted: 07 September 2015 at 9:47pm |
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if you meter bat+ve to amp+ve (IE line drop), even a £10 Meter should give you some info, but a solid supply is must to make real judgement about other faults, a quick test with like 100mm of 1.5m maybe a plan...
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dan15550
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Posted: 15 September 2015 at 8:20pm |
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Strange that is.. I first shortened the 1.5mm power cable i was using to a shorter length of about 125mm and still the same problem, i then tested each of the drivers on their own without the crossover and they both work fine so i figured it would be the crossover - so i got hold of a brand new crossover and the problem is worse. Would it be possible all this could happen from a bad solder joint? My solders seem solid but i havnt soldered for years and have no experience..it is the only thing i can think of?
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