Blown Sub?

[Oh_Your_Blind]

Guys, I just got my 1000w Monoblock and 12" sub installed, but in less than 4 hours my sub has blown up..
I went into the shop this morning and he said there a shit sub. The sub has sat around for like a year not being used, but 4 hours of usage then blowing up.. doesnt make sence to me?
I micrometred the wires from the battery, the amp lights are on, and the sub and the boot smell burnt so its definately the sub.
Now the question is, whos at fault, the shit sub, or the audio shops installation? I need to know wether to buy a new sub or kick up a shit and say no its your fault you give me a new one.
If you need part numbers i can supply them.
Thanks

[StoneX]

Whoever was controlling the volume knob is at fault. A sub will only really get blown if it gets turned up too high.

[Oh_Your_Blind]

well he told me, if the next one blows up i'd get the sub replaced for free

[Oh_Your_Blind]

i got part numbers - Monoblock is KAC-8104D
Not sure on the sub though, its a Clarion
some pics:






Gain Sets:



Box Measurements
51cm wide 35 high
side on it was 26 width at the top
and 39 at the bottom
thats lookin straight at the sub

[Sway_OnVY]

I think (and could be wrong) it will depend on the RMS, If the Amp pumping out say 500rms and the sub can only take 250rms, ull kill it. I blew a Fusion Sub the same way.

[Oh_Your_Blind]

Serious. I should ask that ay.. Well he said, if I blow the next one which he's puttin in which is a fusion he'd replace. I get the feeling they knew it'd blow..

[Sway_OnVY]

Like i said man could be wrong, thats just the rule of thumb iv been using. I run a 480 rms mono (split) to 2 250rms subs and havent had a problem. Surely an audio shop would know if the amp will kill ur sub? Or adjust the gains and whatnot so it didnt overpower. But hey, a free sub is a free sub!

[StoneX]

You are wrong.

An amp doesn't make it full power all the time... A 500Wrms amp will make from 0W up to 500W depending on the person turning the volume up. If you have a 500W amp and 250W sub, the person can and probably will turn the volume up so the sub gets too much power and cooks. Usually subs hit their mechanical limit before their thermal limit. So you'll hear the sub tapping or rattling before it cooks anyway. I've been using 2000Wrms amps with 1000Wrms subs for years and have been fine until I played the sub until it clearly distorted... And guess what, it cooked

By the way, your bass boost should be turned back to 0 and your LPF changed to about 100Hz. The bass boost being on will have assisted in you cooking the last sub. Whoever set those amps up is retarded and you should not take ANY advice from them.

[acarmody]

Is that bass boost turned up to the max?? Thats kills stuff.

[Oh_Your_Blind]

So they have set the amp wrong? Should I be kicking up a shit saying you ****ed it?

[StoneX]

They didn't **** it. Bass boost isn't necessary though. It will just cause your equipment to distort quicker than normal.

The bass boost is on about 10. The flat side of the dial indicates the side to look at.

[Oh_Your_Blind]

so just accept its blown?
What can i do to prevent the next one blowing?

[holdenboy]

Get someonewho knows what their doing to set the gain / LPF / Bass Boost when you get the next sub. He should tell you the maximum volume level you can go to. Once this is done, do not turn up the bass or loud settings on the head-unit to get more bass.......this will result in a blown sub once again.

If youre still not happy with the amount of bass, by a better / another sub.

[Oh_Your_Blind]

thanks holdenboy.. thats all i needed!
one more thing. why would it blow.. what did i do?..
it was only on for about a hour and 30 of it, it was crankin

[holdenboy]

Could be a number of reasons....more than likely the amplifier was putting out a distorted signal, which destroys subs.

[Oh_Your_Blind]

so wont that ruin the next sub too?

[holdenboy]

Amplifiers put out a distorted signal because the amp isnt tuned right and/or the volume on the head-unit is turned up too much. This is the reason for me saying that you need to get the amp tuned by someone who knows what they're doing.

[Oh_Your_Blind]

Alright, well Im buying a 1200w kenwood sub from autobarn, its on special from 170 to 130, and getting it tuned and installed for 60, with a lifetime gaurentee.. Reckon its a goer?

[holdenboy]

Lifetime guarrantee ay? If they stick by that i'll be very impressed. Anyway....if they tune it right it will go fine, just remember its not "1200w", more like 300wrms......which is ideal for your amplifier.

[acarmody]

Just make sure they tune it right this time, and ask them what the maximum volume on the H/U will be.

[Joe Bellissimo]

I don't really agree with that maximum volume thing, it also depends on the volume of the source. Helpful, but not the be all and end all imho.

[Oh_Your_Blind]

Excellent. Well ill ask tomorrow.. Make sure its all done alright, ill question the guarrantee. Ill ask the maximum volume they think I should use. Thanks for all your help!

[acarmody]

I don't really agree with that maximum volume thing, it also depends on the volume of the source. Helpful, but not the be all and end all imho.

Its not the end all, but it is a nice easy 'guide/reference point'

[Oh_Your_Blind]

bought a kenwood 1200w on special at autobahn, 179 down to 119, then got it installed and tuned for 60. First thing he did was laugh when he smelt burning smell in the boot, put the bass down to 0 on the amp, fiddled and it goes alot better now!

[holdenboy]

Yeah, that burning smell is very well-known to installers

Good to hear you got it done properly.....just dont turn the volume / bass settings up too much.