Thumping through subs when it feels like it
Hey all .. I have 2 x 12 earthquakes the old school type.. Now i have them disconnected due to a trip to QLD and kids stuff needing my boot :P .. i went to put them in and not if i hook one on its ok but sounds crap, If i plug both in it starts thumping randomly at will, it doesnt matter which one i plug in first, it still does it .. I am using a US Audio 600w max output 1 x 240w @ 14.4 v or 1 x 200 w @ 9.4v (yes its shit .. but its been a great amp so far) i have turned all the gain and everything down and just set it for a bass back up, (so u can just hear it) and ideas why it could be doing this, it has never done it before and i was told 15 differnet stories by Autobarn and i really dont care to much for what they have to say!
Donati..Whoa Green
The reason you got 15 different answers at Autobarn is because you found 15 different idiots.
First off, if you plug the subs in and disconnect the input to the amp does it still make noise.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
LMFAO .. I was being nice .. But yes you are right, yes it does stop .. But i have noticed another thing .. it might be helpfull. I have an idoit gauge, cause i was having dramas when i first installed it, that tells me the volts that the amp is getting .. When it thumps it goes from 13.8 - 14.0v (car runnning) to 12.5 - 12.8v when there car is off ign on, it goes from 13.2v to 11.8 - "Lo". Does that make any difference to the answer of what it could be ?
Donati..Whoa Green
I'm thinking that the problem isn't the amps or sub but the source, but maybe not.
When you say you hooked one sub up but it sounded crap, did you have the amp set to LPF about 80-100hz?
And how did you wire them up when you hooked both subs up? Diagram would be good?
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
I just relised i havent given all the info mate .. the amp is a mono block amp there is no HPF or LPF switch.. it is set on Z BASS @ 8DB and the the other dial is set at about 95DB. When i hook just either one of the subs up to the amp + on + and - on - , the bass is low and sounds destorted it i go + on - and + on - it sounds worse .. So the wires are right when it is POS on POS and NEG on NEG .. What i will do is Upload some pic 2 morrow arvo of the subs and amp and see what you can come up with
Donati..Whoa Green
Yeah photos would be great, especially of the amp ends since I have never heard of those settings before.
Also if you get a chance try and find another source to drive the amp. Another H/U or something. Even just getting a mates car parked next to yours and just running the RCAs from one car to the other.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
Sorry it has taken me time to do it. .I have been flat out .. But here are the pics of the amp and subs abd voltmeter
Last edited by vn_wagon90; 27-02-2011 at 02:02 PM. Reason: Added
Donati..Whoa Green
Got any bigger pictures?
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
How can i make them bigger .. There just off the phone, they have been bigger on my facebook pics, and my desktop, Just not here
Donati..Whoa Green
Go to your facebook page, right click on the images, get the direct url for them (In firefox its right-click 'copy image location') in the post reply page here there is a button called insert image, click that, insert image url, and done, rinse and repeat for each image.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
Sweet mate .. gimme 5 and ill get them up
Last edited by vn_wagon90; 27-02-2011 at 09:50 PM.
i cant get them any bigger, Thats doing the way you said to do it .. can i email them to you ??
Donati..Whoa Green
Sure but I'll have to look at them tomorrow after work.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
captain halfajob
my amp did that once when the earth lead wasnt connected properley. tightened it up and it stopped.
just sayin'
Sweet as mate .. I noticed for some stupid reason, My earth is a shit one at that .. I am going to change it all today and see if it reacts different. But i noticed, that when it starts to thump and i turn the volume right down to 0 it thumps worse .. Then i turn it right up and it stops :S .. Bu thanks for the Heads up mate
Donati..Whoa Green
Is that speaker wire for ground wire???? I'm surprised it hasn't melted yet. Anyway replace that first. General rule is the exact size or bigger than the power cable.
See how it goes after that. Chances are you are experiencing big voltage drops because of that ground cable.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
Ok all changed the earth to nice and thick stuff (off cut to the power cable) now i have a mega power drop when the bass hits .. about volt drop (13.8v no bass to 11.1 worse case it hit when bass hit).. Normal ??? I can upload the pics now .. HAHAHAHA ..
I will post the one up off the amp in 5 .. need to go take one
i still ahve the thumping .. But not as bad .. So that earth wire was a problem .. Next i am thinking RCA leads or AMP .. Or tho the amp has been repaired 4 times from melting lol
Last edited by vn_wagon90; 01-03-2011 at 09:16 PM. Reason: Cant spell for crap !! lol
sorry guys bare with me as i am new with this site, i have a 1800watt mono block kenwood amp and two 400 watt soundstream 15inch subs with a 2000watt capacitor, with my amp as low as it can be it cuts out all bass at high volume turn it down for a second or two it comes back on and also i have dimming lights at half volume. i thought that the capacitor was supposed to help it but it seems to do nothing at all is there any suggestions anyone could give me thanks much appreciated
Has this happend all of a sudden or has it been like this from the start ??Originally Posted by xxaussiepridexx
(Hi all, 1st post, new to forums, etc etc)
xxaussiepridexx, you are hijacking someone else's thread, but I think your issue is with power. I think the amp is cutting out due to voltage drop. Make sure you have a thick enough cable running from the battery (fused of course).
I'm assuming that sub box is not split down the middle, and both subs are in the one big enclosure. Being the case, hooking up just one set of posts to the amp (one sub) will sound terrible, because the un-powered sub will be acting like a passive radiator, but 180 degrees out of phase. This would make terrible bass. Either hook up both sets of posts or it won't work.
Try with both subs hooked up, then take a measurement I.E. play some music at a moderate volume and take note of how bassy it sounds.
Then swap around + and - on ONE set of posts and repeat the test. Same music, same volume.
The two configuration should be HUGELY different in bass level.
That is just one test, to make sure you have the 2 subs wired in phase. It's something you can try pretty easily.
Another would be to see if the signal is OK. Get a cable that is 3.5mm earphone plug on one end and RCAs on the other. Use an iPod or some other MP3 player as a source. See if that works properly.
Donati..Whoa Green
2000watt capacitor LOL, capacitors are measured in Farads. Pics of it or it doesn't exist.
Capacitors do nothing if the rest of the electrical system isn't up to scratch.
When you say amped turned down all the way, do you mean the gain? I suspect you have a wiring issue to deal with.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
Donati..Whoa Green
Did you properly bolt the ground in? Sand back all the paint? Bolt nice and tight? Can you take a pic of the ground cable? Though on a lesser resolution than what you sent me. 1 Megapixel is plenty until you get a real camera with real optics.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
the gain is only about halfway
at idle
when bass hits
settings of the amp
Just to show the output, Its max output altogether is 600watt
just so u can see what is powering it all
Yes the wires are in there as far as they can go
I dont have the thumping since i have change then negitive wire again to suit the bolt up system to the base of the amp and since i re did the pos wire so possible just a shitty connection
Last edited by vn_wagon90; 02-03-2011 at 09:24 PM. Reason: Double of pics
Is that volt drop a good thing or a bad one ?? Dont get me wrong for the car and and what the amp is , it freaking pumps .. I also have a kenwood mono block, maybe i should use one for each sub for the time being ???????
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