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Thumping through subs when it feels like it

B1n0ry

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(Hi all, 1st post, new to forums, etc etc)
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
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).
vn_wagon90 said:
When i hook just either one of the subs up to the amp + on + and - on - , the bass is low and sounds destorted
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.
 

acarmody

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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

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.
 

acarmody

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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

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.
 

vn_wagon90

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184356_10150092541376010_728306009_6739091_723978_n.jpg

the gain is only about halfway
188914_10150092541216010_728306009_6739085_6791054_n.jpg

at idle
183226_10150092541271010_728306009_6739087_2690178_n.jpg

when bass hits
183955_10150092541311010_728306009_6739088_525983_n.jpg

settings of the amp
184298_10150092541436010_728306009_6739092_1582480_n.jpg

Just to show the output, Its max output altogether is 600watt
183612_10150092541171010_728306009_6739083_7767312_n.jpg

just so u can see what is powering it all
183102_10150092541106010_728306009_6739079_7437042_n.jpg

Yes the wires are in there as far as they can go :) An nice and tight to :)
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
 
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vn_wagon90

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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 ???????
 

vn_wagon90

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They have all just been redone, could it be my alternator not supplying proper volts ?? as in its on its way out ??
 

xxaussiepridexx

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since the start
 

xxaussiepridexx

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all the wiring is brand new i have replaced it 2, and yes the gain is as low as it can go, i think i may have found the problem but im not sure how to resurrect it. my subs are 2 ohm stable but the amp is a 1 ohm stable how do i bridge them to run at 1 ohm stable any help would be great
 

acarmody

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all the wiring is brand new i have replaced it 2, and yes the gain is as low as it can go, i think i may have found the problem but im not sure how to resurrect it. my subs are 2 ohm stable but the amp is a 1 ohm stable how do i bridge them to run at 1 ohm stable any help would be great

I need the amp model number and the subs model number, and I will tell you.
 
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