Question about Samson RS12 HD PA Enclosure

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Something blew-up in the speaker cabinet. it turns out it's the protective lamp overload. May I know if you carry that? Thank you

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Fred Yearian

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Usually that lamp part ONLY protects the tweeter. If the woofer doesn't generate sound, then you probably blew the speaker as well. This speaker is rated at 250 Watts PROGRAM... that means your amp you drive this with should be no bigger than about 150 Watts RMS or you can blow the speaker. You should be able to get reasonable sound for a 20 foot square room with this unit.

Posted on Aug 10, 2011

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After hooking up the PA for practice, I heard a loud "pop," then followed by a burn smell, from my Mackie SRM 450 speaker, which I use as a monitor. No sound comes through but static and crackling. Is the...


The pop itself isn't necessarily a bad thing, but a burn smell and the fact that it's only outputting a crackle likely means that the built-in amplifier circuitry has been overloaded. This can happen a few ways:
1) Faulty power, either a bad cord or a bad outlet
2) Plugging the output of a power amplifier into this speaker - because it has a built in amplifier, this speaker only wants a non-powered line input
3) If the Thru output is (accidentally) plugged into anything that provides phantom power, that could overload the circuitry.
4) A short due to liquid or moisture contact - these cabinets are most certainly not waterproof
In any case, the amplifier part of the circuitry IS replaceable. If you're not comfortable buying one and replacing it yourself (I'd recommend eBay), take it to any shop that sells similar items. If you're extremely lucky, it was just a fuse that needs to be replaced, but chances are you'll need to replace the whole amp.

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Blown speakers?


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No low end from speaker. Sparks came out of backplate when switching the plug from jacks. Now the horns are only thing that works


If you failed to turn off the amp before changing speaker cables you have fried something. Since the plug shorts when unplugging, if the amplifier were on, the amp would sense the short and will often fry the amplifier or the speaker. You don't mention what the amplifier was. If the speaker were daisy chained to other equipment a ground loop probably formed and blew out the woofer. The horn often has Peavey's "SoundGard" circuit so it probably survived. NEVER change speaker cables while amp is on. ALWAYS secure the 1/4 inch type cables through the handle of cabinets so they can'tbe inadvertenly pulled out and burn up equipment. Your amplifier driving one of these should be rated at no more than 200 watts RMS. These "400 watt Prrogram" ratings are for the birds... fake advertising. Put 400 watts into this RMS and it blows out.

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The volume setting on the speakers has LITTLE to do with how hard you are driving them. Your source might be extra hot and overdriving them. Read the specs on the speakers and use a sound meter to check your level. The speakers, being only 12 inch, should fill a room 20 foot by 20 foot to about 95 to 100 Db which you are only allowed 2 hours in MAX to prevent hearing loss. At 6 hours you should keep it down to 85 Db SPL. I know several deaf musicians that were exposed to high sound levels in rock bands... a deaf musician is kind of washed up.

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What was the glowing inside my peavy pr 15 pa cabinet when I turned up my treble on my pa amp by accident? There was no damage I was just curieous as to what that glowing was


There is a speaker protection circuit that uses a lamp that will light IF you are driving the spoeakler TOO HARD !!! You can search for "Peavey speaker protection" circuiot online.

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What it sounds like is that the thermal overload protection is engaging because there is a component that is overheating. I don't know what the operating voltage is of 12AX7A/ECC83 but I would imagine that would be one of the hottest components in the chassis along with the switching power supply. There is an issue with your pedal however it is tough to say without looking at it. Sorry I couldn't be more help. Good luck!

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What is the fuse name/type


those are Red Dot Lamps. people most comonly know them as red dot fuses, ( whatever ) it just goes on the crossover to protect your hfd. if it blew you might want to take time to check your Tweeter.

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I have a Behringer EPX 2000 amp. The limit lights are lit up and the amp isn't powering up properly. There is a bad burnt smell to the amp and sub so i'm pretty sure something has blown. The limiter switch...


The limiter probably delayed the eventual damage. Nothing prevents all damage absolutely.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech for forensics and further action.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

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1 Answer

Protection light came on then went of now i get nothing when i flip the switch to on.


Likely an overload failure caused the protect light to come on, and then the fuse blew so all power is off... Do NOT replace the fuse as you will LIKELY do additional damage to components. Take unit in for repair immediately.
Note: These units are really hard to work on due to the way they are packaged.

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1 Answer

Wiring diagram


Blue should be positive

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