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KEF 104 cross over
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proffski
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PostPosted: Fri Feb 25, 2011 12:42 pm    Post subject: Reply with quote

Richie wrote:
Mine are just screws, maybe I should fit bolts, would this be a captivated nut ?


I have never seen KEF using just woodscrews on larger drive units, tweeters yes but certainly not on B200 and ABR on the 104 unless it is a kit of course, but even then the correct T-Nuts were provided. Confused
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Richie
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PostPosted: Fri Feb 25, 2011 1:39 pm    Post subject: Reply with quote

Thanks, something like Araldite will do ?
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Richie
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PostPosted: Fri Feb 25, 2011 1:41 pm    Post subject: Reply with quote

proffski wrote:
Richie wrote:
Mine are just screws, maybe I should fit bolts, would this be a captivated nut ?


I have never seen KEF using just woodscrews on larger drive units, tweeters yes but certainly not on B200 and ABR on the 104 unless it is a kit of course, but even then the correct T-Nuts were provided. Confused


Thats odd, I have 2 pairs and they alll have just screws on all the drivers.....
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proffski
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PostPosted: Fri Feb 25, 2011 1:43 pm    Post subject: Reply with quote

Richie wrote:
Thanks, something like Araldite will do ?


Yes, when building my TLs/Labyrynths the nuts were sharpened and cleaned with fine emery & meths prior to being hammetred into the baffle.
Then they were glued in with Araldite and a hair dryer was used to get the adhesive to flow nicely... worked like a dream! Smile
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Richie
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PostPosted: Fri Feb 25, 2011 1:49 pm    Post subject: Reply with quote

Sorry, I standed corrected, the white ones do indeed have bolts but the other wood veneer ones are screws, maybe they are a kit as you say.
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Richie
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PostPosted: Fri Feb 25, 2011 1:51 pm    Post subject: Reply with quote

standed = stand lol
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audiolabtower
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PostPosted: Fri Feb 25, 2011 2:28 pm    Post subject: Reply with quote

the other strange thing is your flat suspension is a SP1054 as described in previous post? but the 104 and aB used SP1039 which was a special low distortion short coil, long gap B200, and the 1054 was only used in the Calinda?
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Richie
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PostPosted: Fri Feb 25, 2011 8:13 pm    Post subject: Reply with quote

Bit confused here, I think Jon's 104 is a kit, the front baffle looks different...
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proffski
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PostPosted: Fri Feb 25, 2011 8:15 pm    Post subject: Reply with quote

Richie wrote:
Bit confused here, I think Jon's 104 is a kit, the front baffle looks different...


Yes, I too noticed the chamfered edges, but to use woodscrews... Crying or Very sad
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T.O. Chef
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PostPosted: Fri Feb 25, 2011 8:45 pm    Post subject: Reply with quote

I thought when I saw Jon's that that the cab's were originally KEF factory made, but he'd constructed new baffles that jut outwards.
I was wondering how much internal volume it had added, how they were attached, and what if anything were used as grills.
And wouldn't that narrower baffle change the t-27 response characteristics?
Can you elaborate Jon?
Proff, I too have seen a lot of 104aB's but neer' a one with screws holding the B-200 / BD-139. Only T-nuts.
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Nimo_jon
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PostPosted: Sun Feb 27, 2011 2:31 am    Post subject: Reply with quote

On my both pairs of 104, the T27A are held onto the baffle recess by 3 tapping wood screws. The baffle is chip board and if too much torque is added, it would lost its grip. On one of the 104, I had to use epoxy and woodfiller to reconstruct part of the recess. I am going to use blots and nuts with washers at the back to hold the T27.

The B200 and SP1024 SBR are both held onto the baffle by 4 screws and T nuts. Using too much torque will twist the back nut anchor and destroy the back of the baffle. Madisound sells the parts.
https://www.madisound.com/store/index.php?cPath=404_18_393

Both 104 and 104aB use the SP1039 B200. It is critically damped suspension, Q~0.45 with short voice coil and large air gap.
The Calinda bass reflex uses the overdamped B200 SP1054, which has a Q of 0.23.. Long voice coil smaller air gap.
I once mixed the two up and used the 1054 on the 104. No good.
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T.O. Chef
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PostPosted: Sun Feb 27, 2011 3:57 am    Post subject: Reply with quote

Ah!
Mysteries solved. Correct B-200's in use. Bolts & T-nuts on them and the passives. Screws on the T-27's as prescribed Smile
I have wondered how a Calinda woofer would perform in 104 cabinet. Interesting to know the experiment's been done and the result's now documented.
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audiolabtower
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PostPosted: Sun Feb 27, 2011 1:33 pm    Post subject: Reply with quote

yes, good info about the 1054 in the 104 box. I often wondered what the difference was compared to 1039, given the Calinda and 104 were so close in design, and what would happen if you tried each in the other Smile
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Nimo_jon
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PostPosted: Thu Mar 03, 2011 5:50 pm    Post subject: Reply with quote

The 104 is sealed box design. Tapping the B200 will cause an associated movement on the passive reflector.

The Calinda is bass reflex design.

I would think of the two as entirely different designs.
The Q of the two drivers are very different.

Still, as an owner of a 20 year old Carton III, I prefer the 104.

Dang, I got bitten by the KEF bug again.
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proffski
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PostPosted: Thu Mar 03, 2011 6:14 pm    Post subject: Reply with quote

THe KEF Calinda a bass reflex design? Shocked
Not in this universe! http://www.kef.com/Resources/KEFTopics/KEFTOPICS_vol3no2_the%20calinda%20and%20cantata%20loudspeakers.pdf
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