subs are fully broken in , now amp protects after a 15 minute romp.

[Bassin Buick]

just what the title says. any clue what i can do besides a different amp?

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[09civic 5,000+ posts]

what are you running again?

 

[Bassin Buick]

in the sig. its a pair of d4 american bass 8's wired to a 4 ohm final load running bridged off a zed made usacoustics usx-800f.

 

[winkychevelle 10+ year member]

Coils heating up causing impedance drop at a certain frequency? My guess is that somewhere in you bandwidth the subs drop below 3 ohms causing the amp to protect. Try a few different songs or a signal sweep.

 

[The_Grimy_One 10+ year member]

Only thing I can think of is that they are wired into 1 ohm and the amp is not stable at that, or it is just over-heating. I understand you said you havent changed anything, and it has just started happening, but those are my ideas.

 

[Imtjnotu 5,000+ posts]

overheating? could u hook up an aux. fan?

 

[Bassin Buick]

i know for a fact they are not wired to 1 ohm. lol. i am no noob , i think it's the coils heating up. the amp does way more than 800 , it will pop four 20 amp fuses like a a rubberband , gotta run 30's in it. i'm willing to bet it does between 1000-1100 watts , and my subs are only rated for 300 each , thats almost double the rated power they are seeing. the coils definetly get warm. so its prolly the impeadance dropping like winky said. i can do it in half the time if i play lil jon bitch slowed down. lol

 

---------- Post added at 01:54 AM ---------- Previous post was at 01:54 AM ----------

 

overheating? could u hook up an aux. fan?

amp is already fan cooled internally

 

[The_Grimy_One 10+ year member]

i know for a fact they are not wired to 1 ohm. lol. i am no noob , i think it's the coils heating up. the amp does way more than 800 , it will pop four 20 amp fuses like a a rubberband , gotta run 30's in it. i'm willing to bet it does between 1000-1100 watts , and my subs are only rated for 300 each , thats almost double the rated power they are seeing. the coils definetly get warm. so its prolly the impeadance dropping like winky said. i can do it in half the time if i play lil jon bitch slowed down. lol 

---------- Post added at 01:54 AM ---------- Previous post was at 01:54 AM ----------

 

amp is already fan cooled internally

I never said you were, I was just throwing it out there. Accidents occur. Throw external fans on it too!

 

[Bassin Buick]

i've also noticed it does it n this kind of scenario.............

sitting at a red light slammin , at idle , voltage around 12.5 , punch the gas on the green light , voltage spikes back up to high 13's low 14's , amp shuts off. this is after a song or two at high volume.

 

[Bassin Buick]

I never said you were, I was just throwing it out there. Accidents occur. Throw external fans on it too!

yeah , my dmm reads 4 ohms at the amps terminals. maybe i should put it on there after i get them hot and see what it reads?????

 

[winkychevelle 10+ year member]

Yea my guess is it's dropping impedance. Looking at your box specs it seems a little big for eights but I'm not sure. Last time I had this happened to me I changed my tuning of my box and the problem just disappeared. My 2510 d2 did this to me when I wired it to 4ohm on a older two channel. Changed my box from 1.27 tuned to 36, to 40 and it just disappeared

 

[winkychevelle 10+ year member]

Could be the voltage spikes as well I know a few Stetsom amps had this problem

 

[Bassin Buick]

well the spikes have always been there , so i'm gonna lean toward the impeadance curve changing with the heat.

 

[winkychevelle 10+ year member]

Run a tone sweep and take imp readings for 30-50 hz. The system doesn't have to be full blast for this. If the readings drop below 3.5 ohms for long the amp will prolly protect but during music it might only see that reading for a sec. Lil john bítch is mostly a continuous bass line and slowed it holding certain frequencies longer than normal.

 

[Bassin Buick]

Run a tone sweep and take imp readings for 30-50 hz. The system doesn't have to be full blast for this. If the readings drop below 3.5 ohms for long the amp will prolly protect but during music it might only see that reading for a sec. Lil john bítch is mostly a continuous bass line and slowed it holding certain frequencies longer than normal.

how do i measure impeadance with them moving?? i have never seen that done before , is there a procedure for correctly measuring like that?