my amp blew both fuses!
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=5566
Printed Date: May 19, 2024 at 10:31 AM
Topic: my amp blew both fuses!
Posted By: demond96
Subject: my amp blew both fuses!
Date Posted: November 17, 2002 at 5:45 PM
 Hi everyone I've been receiving some good advice from you guys here on 12volt. So here I am again with a new problem. I have three dvc Digital Audio 4ohm 12" subs, wired in parallel(+ terminals to +terminals, -terminals to -terminals). My amp is a Visonik v2408 (600watts). The installation guide that came with the amp says that it is set up to operate on a minimum load impedance of 2ohms stereo, and 4ohms mono(bridged), or 8ohms in tri mode. the way I had this wired I guess that was a parallel wiring configuration, it played like this for a while until I removed the Xover and it played louder in my opinion so i left it that way. Now today when I tried to shake residential windows, playing "rep yo city" by E40 when the low end bass hit both my fuses blew. My fuses are 20 amp fuses. I could simply replace the fuses but that would not solve the problem. I could replace them with 25 or 30 amp fuses but I'm scared of what might happen. What should I do, Help me please.
Replies:
Posted By: jthom999
Date Posted: November 17, 2002 at 7:34 PM
which fuses blew? if it was the fuses in your amp, I wouldn't increase them, but if it was fuses on a distribution block you could match the current on those with the fuses on your amps.
Posted By: demond96
Date Posted: November 18, 2002 at 2:19 PM
 The ones that blew were on the amp, both were 20 amp fuses. As soon as they blew the amp shut down. What would cause this to happen and how could I correct it without changing my wireing configuration. -------------
Posted By: DeathsJester12V
Date Posted: November 18, 2002 at 3:09 PM
Demond...Make sure you don't have a Shorted out Sub, causing a massive load.... Make sure all your connections are good and solid... no matter what...DO NOT INCREASE THOSE FUSES!!!! You could Fry your amp It sounds like you have a sub shorted... ------------- Đễẳ†ђş 12\/ Ĵęśŧē®™
Posted By: demond96
Date Posted: November 18, 2002 at 4:30 PM
 O.k! I check the subs, replaced the fuses and jacked up the volume. After about 5mins, every thing seemed fine. So maybe it was a sub short. And maybe the problem is solved, if not I'll need more advice. Thank you for pointing me in the right direction. -------------
Posted By: Dan M C
Date Posted: November 18, 2002 at 6:40 PM
Also in the future you may wanna check your sub tensils,on my a/d/s/ rs.2 one of the tensils touched the back of the aluminum cone,my amp went into "protection" big time !,the lead fused itself to the back of the cone ! so they gave me a new sub,actually the one that got nuked was a 10" so i got a 12",looser bass but i love it anyway,my 10'' was tight like @#^%&...you know.
-------------
Dan M C
Posted By: demond96
Date Posted: November 19, 2002 at 5:37 PM
 -------------
Posted By: DeathsJester12V
Date Posted: November 19, 2002 at 5:45 PM
Interesting response..is it custom
-------------
Đễẳ†ђş 12\/ Ĵęśŧē®™
Posted By: demond96
Date Posted: November 19, 2002 at 5:58 PM
 A custom install job by a qualified installer. If thats what your asking. No it was not installed by a qualified installer. I installed this through time, trial and error. I had this in my explorer for about 2 years and never had this problem. I took all the precautions I know of and used new wires, fuses, distrubution blocks, head unit, subs, door speakers, and amps. Over time I came across these things at reasonable prices. So who can tell me what is going. Its driving me crazy. -------------
Posted By: chasesaccessori
Date Posted: November 20, 2002 at 1:02 PM
disconnect the wires from the amp and put a meter on it and check the ohms the speakers are showing. Hope its not less than 2. Next....check your ground! actually pull it off the vehical and clean it and do the same on the amp side. Check that the speaker wire does not have a hanger. no loose copper strands anywhere! ------------- (owner/installer)
Chase's Accessories
Ridgecrest, CA
in business since 92
Posted By: NyxBass
Date Posted: November 20, 2002 at 4:30 PM
if you are running 3 speakers in parallel each at four ohms, the simple math of Ohm's Law (Rt=1/((1/R1)+(1/R2)+(1/R3)+...) where Rt=total resistance R1,R2,R3=each resistor (speaker) in the circuit. put the numbers in, and you get: Rt=1/((1/4)+(1/4)+(1/4)) Rt=1/(3/4) Rt=1.33333333333333 (forever) Ohms. That is BELOW the rated lowest impedance of your amplifier. Now, you didn't say whether you have the amp bridged, if you do, the lowest you can safely load you amp is FOUR ohms. If you are in stereo, the lowest os two ohms. From your description I think you are bridged, but cannot be usre. If so, the reason the fuses blew was to keep the amp from frying. You're very lucky you havn't fried it thusfar. To make a safe load for your amp, you need to re-wire the subs to get a load that is HIGHER than 4 ohms. I'm not sure on your description whether your subs are dvc with each coil being 4 ohms, making each sub 2 ohms, or dvc, with each coil being 8 ohms making each sub 4 ohms. If each coil is four ohms, and everything is in parallel, you are actually running an effective load of 0.6666666667 ohms, WAY too low for your amp. With a little more information, we'll be able to help you get your subs all correctly ired. For now, just realise that you are running too low, and are in danger of frying your amp. ------------- /NyxBass
Posted By: demond96
Date Posted: November 20, 2002 at 5:14 PM
 My subs are dvc each coil being 4ohms. When I wire them in parallel They are 2ohms. All three subs together they are 0.66 something. For nearly a year I've had these subs and amp wired like this and had no problems. O.K, I recently pulled everything out to clean and noticed that I did not have my amp bridged, so I changed it to how the manual for the amp says to bridge it correctly. Thats when the fuses started blowing. So I changed it back to + from the right to + from the left and everything is back to normal. Why is that, the sound is the same but the fuses don't blow. I can turn the volume up and the fuses hold, bridge it and the fuses blow. -------------
Posted By: DeathsJester12V
Date Posted: November 20, 2002 at 8:57 PM
First...demond..that interesting response, was me being a smart allec...right above it you posted..jsut your name...jsut so you know... Second...because when you are bridging the amp the correct way, you're putting a 0.66 load on it, as you said...VERY FEW AMPS ARE 1 OHM STABLE, TO BEGIN WITH!!! and Visoninks...are only 2 ohm stable... Like we said...be glad the fuses blew, and the amp didn't decide to smoke you out of your ride.....Rule of thumb...if you're unsure of your amps abilities..do not drop any laod on it below two..so if you're running stereo, 2 ohms a channel...running mono..2 ohms total....... And the reason you're didn't have this problem before...you might have done a Series Parellel, or some other type of wiring scheme that didn't drop the load down below 2 ohms.... ------------- Đễẳ†ђş 12\/ Ĵęśŧē®™
Posted By: demond96
Date Posted: November 21, 2002 at 1:31 PM
 Thanks guys for all of your time. I do apprecciate your help. So far everything is playing well, for now. I still have everything wired left side+, to right side+, As long as nothing happens and it continues to sound low, loud, and clear, I'll leave it like this. But still can anyone say why this amp is playing with it being wired like this. Once again, thanks guys. -------------
|