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Post by kiwiemo on May 8, 2017 22:15:35 GMT -5
Hi all. Been a while since I posted, it's taken 6months to final get my XPA-1's. But that's another story.
So I plugged the amps in, all correctly, and turned on a tune, working well, so up the volume a touch, still good, short story short, end result I think they fried my not so old KEF R900's. (8 months old).
Was the choice of amps to much for the Speakers??
Any help will be good
Chur
Kiwiemo
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Post by novisnick on May 8, 2017 22:26:50 GMT -5
Hi all. Been a while since I posted, it's taken 6months to final get my XPA-1's. But that's another story. So I plugged the amps in, all correctly, and turned on a tune, working well, so up the volume a touch, still good, short story short, end result I think they fried my not so old KEF R900's. (8 months old). Was the choice of amps to much for the Speakers?? Any help will be good Chur Kiwiemo I'm thinking that you may have fed the speakers too much juice. Its not unheard of ya know. How loud was it before they smoked? Did the amps redline or blow a fuse? |
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Post by dcg44s on May 8, 2017 22:41:54 GMT -5
Those are pretty efficient speakers (90db),if you blew them it must have been pretty loud.Were you giving it the gas pretty hard? Not trying to knock you here,we have all been guilty of cranking it up hard at one time or another.The amps are rated for more than twice what the speakers are even at 8 ohms so I suppose its possible but I would have expected you to back off before then.
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Post by leonski on May 8, 2017 23:34:05 GMT -5
Any AUDIBLE sign of distress prior to the smoke being released? It's your own fault, you know. Several things happen to speakers as you feed them more power. They get HOT inside, for one. Electrically they change, too. Simpliest Explanation:: www.sweetwater.com/insync/power-compression/If you like it THAT loud, you might consider Cerwin Vega. Some of them are pretty darn durable and will get you evicted from the STATE before they burn up. |
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Post by novisnick on May 8, 2017 23:47:19 GMT -5
Ive fed a set of Klipsch 28's with mt XPR-1's, ( 1,750 watts @ 4 ohms ) and never smoked them! They got loud and changed their sound signature a bit but I never over drove them. Loved the db's they were able to reach but I never listened to music at those volumes. NOT health at all my friends! 😋
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Post by kiwiemo on May 9, 2017 0:23:07 GMT -5
Thanks for the comments,
To be honest, the blue LED's only went to about 3/4 on the display, there was no sound change that I heard, I only notice the damage when I put on another track, and only drove it at the volume for maybe 20seconds. It was loud but clear.
Stupid question but why the one uniQ and not both?
Thanks
Kiwiemo
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Post by frenchyfranky on May 9, 2017 0:30:39 GMT -5
To your question; XPA-1,To much power??
Answer is: NO
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Post by lehighvalleyjeff on May 9, 2017 0:33:06 GMT -5
Your amp's Maximum Power is not the problem. I've run XPR-1's on bookshelf speakers (sounded amazing) with no issues. The problem sounds like you had the amps driving at 3/4 power nominally, however there is a difference between nominal and peak. One strong bass note could easily take the amp from 3/4 power to clipping in a fraction of a second.
My guess is that you pushed your KEFs way too hard and that in the future you might consider keeping the volume down. Your speakers and your amps both have limits. It's important to understand those limits before pushing any system to the edge.
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Post by novisnick on May 9, 2017 2:11:40 GMT -5
Your amp's Maximum Power is not the problem. I've run XPR-1's on bookshelf speakers (sounded amazing) with no issues. The problem sounds like you had the amps driving at 3/4 power nominally, however there is a difference between nominal and peak. One strong bass note could easily take the amp from 3/4 power to clipping in a fraction of a second. My guess is that you pushed your KEFs way too hard and that in the future you might consider keeping the volume down. Your speakers and your amps both have limits. It's important to understand those limits before pushing any system to the edge. I agree, I've also driven a set of KEF LS50's with XPR's and they loved the power, you just have to make sure you know the " Power of the Dark side "!! |
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Post by gzubeck on May 9, 2017 2:54:40 GMT -5
Hi all. Been a while since I posted, it's taken 6months to final get my XPA-1's. But that's another story. So I plugged the amps in, all correctly, and turned on a tune, working well, so up the volume a touch, still good, short story short, end result I think they fried my not so old KEF R900's. (8 months old). Was the choice of amps to much for the Speakers?? Any help will be good Chur Kiwiemo Are they still under warranty? Are both of them damaged? I see that they can handle 115 db...did you go past that volume? |
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stiehl11
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Post by stiehl11 on May 9, 2017 7:54:44 GMT -5
Speaker are rated for 115db, which is about half power for the XPA-1. 3db more and you're clipping both the amp and the speaker. If you were at 67% of the amp then one thump of the bass and you're in the danger zone. If you have THAT large of a room that you need to be driving amps and speakers at that level I suggest you look at pro-series gear like they use in auditoriums and arenas.
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Post by mountain on May 9, 2017 8:12:55 GMT -5
Sorry to hear this. I know I would be disappointed. Good luck getting your speakers fixed.
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Post by brutiarti on May 9, 2017 8:19:06 GMT -5
The opposite happened to me. I fried the ribbon tweeters of my helicons for feeding them not enough power.
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bootman
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Post by bootman on May 9, 2017 8:28:03 GMT -5
To answer the OP's question, no such thing as too much clean power.
But there is such a thing as the physical limits of a speaker.
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Post by novisnick on May 9, 2017 9:10:52 GMT -5
To answer the OP's question, no such thing as too much clean power. But there is such a thing as the physical limits of a speaker.
novisnick
CEO SMBS |
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Post by jcz06 on May 9, 2017 9:28:17 GMT -5
I have XPR-1s on Legacy Focus SEs......they don't miss a beat and love the power.....  |
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DYohn
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Post by DYohn on May 9, 2017 9:31:07 GMT -5
The opposite happened to me. I fried the ribbon tweeters of my helicons for feeding them not enough power. Not really. You fried them because your amp was clipping and sending too much power. It is impossible for "too little power" to fry a voice coil. But it's a common misconception. |
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Post by brutiarti on May 9, 2017 10:11:59 GMT -5
The opposite happened to me. I fried the ribbon tweeters of my helicons for feeding them not enough power. Not really. You fried them because your amp was clipping and sending too much power. It is impossible for "too little power" to fry a voice coil. But it's a common misconception. Yep, you are correct. That is the technical explanation |
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Post by Gary Cook on May 9, 2017 15:59:37 GMT -5
You really need to indentify which driver is "fried". So is it both speakers, left and right, or just one? It may not be both. Low volume, head close to one speaker and listen, then same with the. Once you have identified which speaker then you need to identify which driver in that speaker. Same process, low volume place one ear close to each of the drivers and try and identify which one it is. Good chance it's the tweeter, they usually die first from over driving. Replacing s tweeter or a pair of tweeters is no big deal, and not hugely expensive. So don't chuck out perfectly good speakers until you identify what's cooked and how much it's going to cost to fix it. Speaker repair people are common so check around your local area. KEF drivers can be obtained direct from KEF or from your local distributor.
Cheers
Gary
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Post by garbulky on May 9, 2017 17:01:50 GMT -5
Not really. You fried them because your amp was clipping and sending too much power. It is impossible for "too little power" to fry a voice coil. But it's a common misconception. Yep, you are correct. That is the technical explanation But it happened due to not having enough power! (rofl)Too little gave too much!  |
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