KEF c80 speakers
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sealy
Addicted Member
The C80 is a good speaker, but in my opinion, is not the equal of the Calinda.
The Calinda, even though it has a passive form of the B139, has much superior active drivers to the C80. The B200 mid/bass and T27 tweeter in the Calinda are much better than the mid driver and T33 tweeter in the C80 in terms of smoothness, imaging and overall frequency response.
Despite the fact that the C80 has the active B139 driver, the box size is inadequate for true deep bass. Thus, the bass or the C80 is rolled off around 40 hz.
The Calinda, even though it has a passive form of the B139, has much superior active drivers to the C80. The B200 mid/bass and T27 tweeter in the Calinda are much better than the mid driver and T33 tweeter in the C80 in terms of smoothness, imaging and overall frequency response.
Despite the fact that the C80 has the active B139 driver, the box size is inadequate for true deep bass. Thus, the bass or the C80 is rolled off around 40 hz.
burnsey16
New Member
KEF Calinda Tweeters- Please help and read ASAP
Hello all AK members, first i must thank everyone who has helped me out over the last few days
If you've read any of my previous posts you will know i have bought some KEF calinda's for $120 of ebay, there a beautiful speaker, wonderful sounding.
However one of the tweeters (model t27) has been badly pushed in and i think has caused damage to the sound. The speaker which its in lacks significantly in trebble and is much lower tone than the other speaker, thought there is no distortion crackle or any other effect from the tweeter.
I would just like to ask, is this due to the damage sustained to the tweeter or could it be to do with the crossover.
If this is the tweeter is there a replacement for the t27's ? I have looked on ebay and there is very little, often going for way to much than i can afford
If its to do with the crossover will the crossovers for the KEF calindas be replacable or fixable and at what cost?
I have attached 2 links below of the damage sustained to the tweeter to give you an idea. (sorry there not the best quality)
http://i883.photobucket.com/albums/ac37/Andrew199416/2010-08-1418-56-36340-1.jpg
http://i883.photobucket.com/albums/ac37/Andrew199416/2010-08-1418-56-02012.jpg
a GREAT thanks to everyone who can reply and help out
Andrew
Hello all AK members, first i must thank everyone who has helped me out over the last few days
If you've read any of my previous posts you will know i have bought some KEF calinda's for $120 of ebay, there a beautiful speaker, wonderful sounding.
However one of the tweeters (model t27) has been badly pushed in and i think has caused damage to the sound. The speaker which its in lacks significantly in trebble and is much lower tone than the other speaker, thought there is no distortion crackle or any other effect from the tweeter.
I would just like to ask, is this due to the damage sustained to the tweeter or could it be to do with the crossover.
If this is the tweeter is there a replacement for the t27's ? I have looked on ebay and there is very little, often going for way to much than i can afford
If its to do with the crossover will the crossovers for the KEF calindas be replacable or fixable and at what cost?
I have attached 2 links below of the damage sustained to the tweeter to give you an idea. (sorry there not the best quality)
http://i883.photobucket.com/albums/ac37/Andrew199416/2010-08-1418-56-36340-1.jpg
http://i883.photobucket.com/albums/ac37/Andrew199416/2010-08-1418-56-02012.jpg
a GREAT thanks to everyone who can reply and help out
Andrew
frperdurabo
AK Member
That tweeter looks pretty bad.
If it isn't blown - measure the voice coil with a multimeter, or listen carefully through a drinking straw held close to the tweeter - you MIGHT be able to push it out by using a vacuum cleaner (you'll need to attenuate the suction, somehow), or inserting a pin and pushing gently from inside. Searching AK for "fixing pushed in tweeter dome" will probably give more info.
Both of the above are, IMO, "hail Mary" plays...but what have you got to loose?
Single T-27s turn up on e-bay all the time.
The KEF B200 is a GREAT woofer. Maybe these are crying out to be e-waved? (I'm thinking the smaller, square waveguide)
If it isn't blown - measure the voice coil with a multimeter, or listen carefully through a drinking straw held close to the tweeter - you MIGHT be able to push it out by using a vacuum cleaner (you'll need to attenuate the suction, somehow), or inserting a pin and pushing gently from inside. Searching AK for "fixing pushed in tweeter dome" will probably give more info.
Both of the above are, IMO, "hail Mary" plays...but what have you got to loose?
Single T-27s turn up on e-bay all the time.
The KEF B200 is a GREAT woofer. Maybe these are crying out to be e-waved? (I'm thinking the smaller, square waveguide)
frperdurabo
AK Member
More suggestions on this thread: http://www.audiokarma.org/forums/showthread.php?p=3302421
sealy
Addicted Member
Has to be the tweeter. If you notice the two pins, one on either side, they are the anchor point for the tweeter diaphragm. You can pop the diaphragm off at those two points. If you do so, be extremely careful not to sever the voice-coil leads, which are as thin as a human hair. You can then use your thumb to push out the dome from the inside.
It could be however, that the dome was pushed in to the point where the voice coil is damaged. That could be causing the sound issues. If damage has indeed occurred, I would start looking for another tweeter. As others have mentioned, they do come up from time to time.
It could be however, that the dome was pushed in to the point where the voice coil is damaged. That could be causing the sound issues. If damage has indeed occurred, I would start looking for another tweeter. As others have mentioned, they do come up from time to time.
burnsey16
New Member
T27 Tweeter Problems
Hi guys, its me AGAIN
If you've been following me ive bought the KEF Calindas with T27 tweeters that have some fairly serious damage,
http://www.audiokarma.org/forums/showthread.php?p=3917092#post3917092
However after suggestions from you guys i managed to pop the dust cap back out. It sounds moderatly better now.
I was wondering is there someway i can test/find the real damage sustained to the tweeters, without:
- using a multi-metre to test resistance/ohm's or any other multi-metre reading (would have to snip wire going from X-over)
- Using the straw method (allready done)
I think the damage is to the really high frequancies of the tweeter and it works, but misses out high pitch sounds (like high pitch drum symbols)
Is there a specific test to test this?
If its the coil is there any way it can be fixed as T27 tweeters a fairly expensive and i dont have a lot of dosh atm
haha
Also once again like my other Post, could this be the crossover??
A big thanks to everyone
Andrew
Hi guys, its me AGAIN
If you've been following me ive bought the KEF Calindas with T27 tweeters that have some fairly serious damage,
http://www.audiokarma.org/forums/showthread.php?p=3917092#post3917092
However after suggestions from you guys i managed to pop the dust cap back out. It sounds moderatly better now.
I was wondering is there someway i can test/find the real damage sustained to the tweeters, without:
- using a multi-metre to test resistance/ohm's or any other multi-metre reading (would have to snip wire going from X-over)
- Using the straw method (allready done)
I think the damage is to the really high frequancies of the tweeter and it works, but misses out high pitch sounds (like high pitch drum symbols)
Is there a specific test to test this?
If its the coil is there any way it can be fixed as T27 tweeters a fairly expensive and i dont have a lot of dosh atm
hahaAlso once again like my other Post, could this be the crossover??
A big thanks to everyone
Andrew
Recheck the tweeters again and visually look for any creases that may be left on the dome or at the surround circumference. My recommended method for pulling out T27 domes is to gently "suck" them out personally - works better than a vacuum method (better control).
If there is a crease at the circumference, the voice coil will be non-circular and probably rubbing/hung up on the pole piece. Anything more that a few small dimples/depressions left on the dome will affect its shape and the voice coil but its very hard to get all the dimples out once the cone had been inverted.
If you test both drivers out of the speakers, put them on an amp that has some type of tone controls - turn down or off any bass and midrange control and turn up about 1/2 way the treble controls. Then try playing some music with known high frequency content (Brasil 66, Greatest Hits, lots of sibilance). Don't turn up the volume too high because tweeters don't handle a lot of power. If it still seems like the tweeters aren't playing loud enough, then they have probably been damaged in the past.
If they play plenty loud, then try the same test with them wire in the speakers (or do this first before removing them). Then the problem will likely be in the crossover. Look for any resistors that may look burned, that is a giveaway that the speakers were overdriven in the past with high-freqency content or an amp went ballistic on it. I agree with replacing caps as the crossovers are well over 30 years old now. If you do replace caps, the recommendations above are fine and you should replace one channel first and see what the differences are compared to the stock other channel.
Regards,
Bart
If there is a crease at the circumference, the voice coil will be non-circular and probably rubbing/hung up on the pole piece. Anything more that a few small dimples/depressions left on the dome will affect its shape and the voice coil but its very hard to get all the dimples out once the cone had been inverted.
If you test both drivers out of the speakers, put them on an amp that has some type of tone controls - turn down or off any bass and midrange control and turn up about 1/2 way the treble controls. Then try playing some music with known high frequency content (Brasil 66, Greatest Hits, lots of sibilance). Don't turn up the volume too high because tweeters don't handle a lot of power. If it still seems like the tweeters aren't playing loud enough, then they have probably been damaged in the past.
If they play plenty loud, then try the same test with them wire in the speakers (or do this first before removing them). Then the problem will likely be in the crossover. Look for any resistors that may look burned, that is a giveaway that the speakers were overdriven in the past with high-freqency content or an amp went ballistic on it. I agree with replacing caps as the crossovers are well over 30 years old now. If you do replace caps, the recommendations above are fine and you should replace one channel first and see what the differences are compared to the stock other channel.
Regards,
Bart
sealy
Addicted Member
Once you get them working properly, don't attempt to play them real loud, especially with a modest amplifier. The T27 is not known for it's high power handling and does not take kindly to clipping. Most mid-sized KEF's of that vintage have power handling ratings of about 50 watts, or thereabouts.
