Rcf Art 312

[sandaroadshow]

Hi, all

any ideas on why my art 312 speakers have blown drivers, I used them last night and I could smell how you would describe a burning plastic, I haven`t pushed them too hard but now 2 speakers have blown, and are still under guarantee, and it looks like RCF are going to charge for replacements do you think this is fair.

[spin mobile disco]

It would depend on specifics.
Were they being used on a generator or similar power device? It seems very odd that 2 should fail at the same time. i would look for some common link.
Did you connect something you shouldnt? Burning plastic smell is not something I would expect to smell from a blown speaker. It sounds like a curcuitry problem with the amp module. If they where nto overdriven i.e allowed to clip then they should be covered by RCF under warantee

[sandaroadshow]

I used carlsboro speakers on last nights gig at same power and these never had a problem nor did my old ART300 but when I first purchased these art 312 I was getting a loud humming noise from the speakers and had to switch off for a while then put back on and then say after 10 mins it would start again, after warm up then I would not get a problem all night.

the amp is a tamp 2400, speakers 300w each side volume I put half way to make sure it doesn`t clip.

Behringer mixer acer laptop. so nothing my end could have done it, but we had a big thunder storm that night, I was wondering if it was a power surge.???

can anyone lighten me on this?

thanks

Simon

[sandaroadshow]

As mentioned in post, I have blown 2 art312s I use a tamp2400 and behringer mixer, used carlsboro tonight with no problem but night before my art312 blew both sides.

On the night in question we had a thunderstorm and I lost the speakers, but when I first purchased these speakers I would get a huge humming noise coming through them, I checked the amp and it seems fine on other speakers but after warm up of around 10 mins it would stop.

As saying for smell coming from them it is like a ozone smell, I know I did not push them to the limit and now RCF want to charge me for replacements.

Can anyone please help me here on how these should have blown when all my other speakers lower watt work fine.

ART 300

Carlsboro I know people hate them but they work

thanks


Simon :bang:

[Excalibur]

As mentioned in post, I have blown 2 art312s I use a tamp2400 and behringer mixer, used carlsboro tonight with no problem but night before my art312 blew both sides.

On the night in question we had a thunderstorm and I lost the speakers, but when I first purchased these speakers I would get a huge humming noise coming through them, I checked the amp and it seems fine on other speakers but after warm up of around 10 mins it would stop.

As saying for smell coming from them it is like a ozone smell, I know I did not push them to the limit and now RCF want to charge me for replacements.

Can anyone please help me here on how these should have blown when all my other speakers lower watt work fine.

ART 300

Carlsboro I know people hate them but they work

thanks


Simon :bang:
Right, well I'd have liked to do a few A-B comparisons before they blew, but we don't have that luxury now.
Firstly, amp at 50% volume setting can actually be worse for clipping. I've seen when I had flashing lights if I turn the amp up, and the mixer down that the lights went out. Standard practice is amps up full or nearly full, and control it from the mixer, making sure it's green only. That amp is plenty big enough for those cabs, I'd have used the 1400, which is the equivalent to my C Mark.

As for lightning, well I'd have expected the amp to die, rather than the cabs, but I'm no expert. Surge protected power cables are cheap. ;)

Keep us informed, and we'll see what happens.

[NKR]

Your amp on 50% can actually be a major cause of clipping.

Clipping refers to clipping the top of your sound waves off, so rather than sending a smooth signal you actually end up sending square waves (also known as square waving). Speaker drivers dislike square waves heat up and die.

I can't find anything on the Impedance of the Arts, but assuming its 8ohm, by running your amp at half (T AMP 2400 appears to be 650 watt at 8ohm) you have just about balanced the speakers with the amp.

The smell could be the fact you have been sending current rather than decent signal and have cooked the drivers. If you had been using Peaveys you would have lit the cab up as the protection bulb would have come on.

Other question what did yor DB look like on the desk. Were you running over flat 0db. With the speaker and amp vitually balanced you had little head room. Running in the red would clip the backside off it and cook your drivers.

The burning plastic smell was probably cooked neodynium magnets and surrounds!!!

That is what could have happened, but without being there I don't know for sure.

[Excalibur]

Your amp on 50% can actually be a major cause of clipping.
Clipping refers to clipping the top of your sound waves off, so rather than sending a smooth signal you actually end up sending square waves (also known as square waving). Speaker drivers dislike square waves heat up and die.

I can't find anything on the Impedance of the Arts, but assuming its 8ohm, by running your amp at half (T AMP 2400 appears to be 650 watt at 8ohm) you have just about balanced the speakers with the amp.

The smell could be the fact you have been sending current rather than decent signal and have cooked the drivers. If you had been using Peaveys you would have lit the cab up as the protection bulb would have come on.

Other question what did yor DB look like on the desk. Were you running over flat 0db. With the speaker and amp vitually balanced you had little head room. Running in the red would clip the backside off it and cook your drivers.The burning plastic smell was probably cooked neodynium magnets and surrounds!!!

That is what could have happened, but without being there I don't know for sure.

I said that. ;)

It is, according to the manual, which Google found me. Can you use Google the other side of the Pennines? :p :D :D

Agreed again.

[NKR]

I said that. ;)

It is, according to the manual, which Google found me. Can you use Google the other side of the Pennines? :p :D :D

Agreed again.

I know you said that, but I just expanded on it as there are a lot of folk that don't actually know what clipping is.

Thought it might be. Over this side of the Pennines our big fat stuck together inbred fingers find it difficult to use google :D ;)

And once again harmony is returned and we are back to agreeing :eek: