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Celestion Rocket 50's [message #13247] Wed, 24 March 2010 10:52 Go to next message
Van
Messages: 134
Registered: April 2004
Senior Member
Just picked up a Kustom K 250-4 head and cabinet.
Doesn't have the original speakers.
Inside I found 4 12" Celestion Rocket 50's.
Seeing that the head's 250W and the speakers add up to 200W, I'd be afraid of blowing one or more out.
Anyone have experience with the Celestions?
Re: Celestion Rocket 50's [message #13248 is a reply to message #13247] Wed, 24 March 2010 10:56 Go to previous messageGo to next message
LesS is currently offline  LesS
Messages: 477
Registered: December 2002
Senior Member
As far as power handling - the Celestions are fine.
The K250 power output is 125 watts RMS.
Re: Celestion Rocket 50's [message #13249 is a reply to message #13248] Wed, 24 March 2010 10:57 Go to previous messageGo to next message
Van
Messages: 134
Registered: April 2004
Senior Member
Really?
I assumed it was 250W.
Oh well, learn something new every day!
Thanks!
Re: Celestion Rocket 50's [message #13250 is a reply to message #13247] Wed, 24 March 2010 12:44 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4728
Registered: June 2004
Location: NY
Senior Member
The amp is 250 watts peak.
The tag on the rear of the amp if it is still there states 125 watts rms and this is into a 4 ohm load, so if your Celestions are 8 ohm models and are wired up for a 8 ohm load(serise parallel) the amp will only out put 75 watts rms and 150 watts peak.
If they are 16 ohm drivers and wired that same way the overall impeadance will be 16 ohms and the amp will output 1/2 of what I posted in the alst paragraph.
Re: Celestion Rocket 50's [message #13251 is a reply to message #13247] Wed, 24 March 2010 13:14 Go to previous messageGo to next message
rodak
Messages: 511
Registered: October 2001
Location: Georgia
Senior Member
Keep in mind that any amp can be pushed well beyond it's rated output if you drive it hard enough. At that point, you're into clipping, which sends square waves to the speakers. Speakers do NOT like square waves. So you can blow a 200watt speaker with a 50 watt amp if you push it hard enough. Conversely, you can safely drive a 50 watt speaker with a 200watt amp if you don't push it too hard. The type of signal figures into it, too. I think it would be almost impossible to blow a speaker if you were only playing a flute through it, but guitar fuzz and distortion boxes also produce nasty square-ish waves that speakers don't.

I think of amp and speaker wattage ratings as general guidelines, or rules of thumb. Too often people get caught up in using precise numbers (Oh, no, my amp is rated at 101 watts, my speakers are only rated for 100w!), and wind up missing the forest for the trees.


www.combo-organ.com
Re: Celestion Rocket 50's [message #13252 is a reply to message #13251] Wed, 24 March 2010 15:11 Go to previous messageGo to next message
LesS is currently offline  LesS
Messages: 477
Registered: December 2002
Senior Member
"I think it would be almost impossible to blow a speaker if you were only playing a flute through it, but guitar fuzz and distortion boxes also produce nasty square-ish waves that speakers don't."

Hey Rodak - I'm not sure that I agree with that.
I think a flute sample played on a synthesizer would be easy on speakers, but a flute through a microphone without a compressor could be pretty nasty to a speaker if the volume was set too high.

.. uh oh, I feel a story coming on ... different instrument - but I once sold a beautiful Kustom combo to a guy who blew the speakers immediately with a mandolin. He "only had it on 4" - but we know that 3 or 4 is full clean volume on most Kustoms and you can overdrive the amp into distortion even at that setting. How many previous owners over the years never hurt those vintage speakers with their guitars - but his mandolin destroyed them in seconds.
Re: Celestion Rocket 50's [message #13253 is a reply to message #13252] Wed, 24 March 2010 16:26 Go to previous messageGo to next message
rodak
Messages: 511
Registered: October 2001
Location: Georgia
Senior Member
You're probably right. I was just trying to think of the most sine-wave sound you could get, and being an organ guy, "flute" naturally came to mind.

But I think the point is the same. Mandolin....wow! I love bluegrass, can't imagine blowing speakers with that gentle music!


www.combo-organ.com
Re: Celestion Rocket 50's [message #13304 is a reply to message #13248] Sun, 28 March 2010 11:48 Go to previous messageGo to next message
pleat is currently offline  pleat
Messages: 1452
Registered: June 2004
Location: Belding, Mi
Senior Member
I don't think the celeston Rocket 50's are ava. in a 16 ohm version. So 4 speakers in the cab are going to give you a either a 8 or 2 ohm depending how you wire the cab. I'd suggest a Series and Parallel wiring to get the 8 ohm.
pleat
Re: Celestion Rocket 50's [message #13305 is a reply to message #13247] Sun, 28 March 2010 12:03 Go to previous messageGo to next message
Van
Messages: 134
Registered: April 2004
Senior Member
I may check this with another V/O meter, But I'm getting between 3-4 ohms across the 4 speakers connected which would be perfect.
Re: Celestion Rocket 50's [message #13306 is a reply to message #13247] Sun, 28 March 2010 12:06 Go to previous message
stevem is currently offline  stevem
Messages: 4728
Registered: June 2004
Location: NY
Senior Member
For low resistance testing you can not hold the metal ends of the test probs as it will throw the reading off.
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