SpeakerTalk Forum Index SpeakerTalk
This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Kef 105.4 crossover refurbish & new bascabinets (p-6)
Goto page Previous  1, 2, 3 ... 5, 6, 7 ... 10, 11, 12  Next
 
Post new topic   Reply to topic    SpeakerTalk Forum Index -> KEF speakers
View previous topic :: View next topic  
Author Message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 1:16 pm    Post subject: Reply with quote

I just bought a pair of Kef 105.4 Their midranges (Kef B110) arenīt working, thereīs no sound at all. So, I changed them for another pair of Kef B110. Surprisingly there was no sound either.

What could be the reason the mids arenīt working? All 4 B110 mids I have seem to be just fine

Crossover problem?
Back to top
View user's profile Send private message
willem-57
Senior Contributor 200+


Joined: 18 Jul 2014
Posts: 218
Location: Netherlands

PostPosted: Mon Dec 01, 2014 1:26 pm    Post subject: Reply with quote

Yes, probably a X over problem. Most likely and hopefully it is only wiring that is not connected. Under you see the X over and i think that there is a problem with one of the wires that are attached on 1 of the 5 pins that you see in the middel right. They are market Gn, Bl, BK, etc.

by the way dutch?


Back to top
View user's profile Send private message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 1:30 pm    Post subject: Reply with quote

Hello,

yes, thatīs what I also thought. So, I took a piece of new cable and connected directly to x over yellow and green point (which are as far as I know for the midrange) to my midrange. There was still no sound.

I took midrange and connected very carefully directly to my amp and it played well.

SO, probably one of the caps dried out?
Back to top
View user's profile Send private message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 1:31 pm    Post subject: Reply with quote

And yes Iīm Dutch, also replied to your topic at htforum Smile
Back to top
View user's profile Send private message
willem-57
Senior Contributor 200+


Joined: 18 Jul 2014
Posts: 218
Location: Netherlands

PostPosted: Mon Dec 01, 2014 1:47 pm    Post subject: Reply with quote

Burgerking wrote:


SO, probably one of the caps dried out?



I think so, but strange that both the B110 sections are not working, 1 i can understand, but 2 ?


Last edited by willem-57 on Sat Dec 03, 2016 10:05 am; edited 1 time in total
Back to top
View user's profile Send private message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 1:48 pm    Post subject: Reply with quote

https://www.dropbox.com/s/blzlncys1l5vj0p/DSC_0649.JPG?dl=0
Back to top
View user's profile Send private message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 1:52 pm    Post subject: Reply with quote

Hello,

yes, those are the ones I bought. Tomorrow Iīll restore the housings of the woofers....

I donīt understand why both of them ainīt working, maybe Iīll just order new ALCAP caps
Back to top
View user's profile Send private message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 1:53 pm    Post subject: Reply with quote

Possibly the old ELCAP dried out? Donīt know thich ones are for the midrange?

I I know which caps are related to the midranges I can just order only them and see if it works

Is it true that the midrange wires are the green and yellow points on the x-over and from there the go directly to the midrange?
Back to top
View user's profile Send private message
willem-57
Senior Contributor 200+


Joined: 18 Jul 2014
Posts: 218
Location: Netherlands

PostPosted: Mon Dec 01, 2014 2:00 pm    Post subject: Reply with quote

Yes, they go directly from crossover to the midrange.
I believe that C6 is indeed for the midrange, the LL (LowLoss) are for the tweeter and the four big ones, C1-C2-C3 and C4 are for the woofers.

By the way, under your crossover there is a stamp with the fabrication date.
Back to top
View user's profile Send private message
Burgerking
Introductory Contributor


Joined: 01 Dec 2014
Posts: 9

PostPosted: Mon Dec 01, 2014 2:07 pm    Post subject: Reply with quote

I donīt see a stamp with a date on the back. If the LL ones are for the tweeter, than C5 C6 C8 C9 are for the midrange?

If so, going to try to order those first...
Back to top
View user's profile Send private message
willem-57
Senior Contributor 200+


Joined: 18 Jul 2014
Posts: 218
Location: Netherlands

PostPosted: Thu Dec 25, 2014 8:46 am    Post subject: Reply with quote

On the dutch HT forum the problems of burgerking have been resolved, it where indeed a couple of capacitators in the midrange section ( C6-C8 ) that where failing, replaced them with new ones from Falcon and has now a nice set of RR 105.4 's, end of story.
Back to top
View user's profile Send private message
willem-57
Senior Contributor 200+


Joined: 18 Jul 2014
Posts: 218
Location: Netherlands

PostPosted: Fri Feb 20, 2015 10:31 pm    Post subject: new bascabinets for the 105.4 Reply with quote

A specialist has made some drawings off the new bas cabinet for the 105.4 speakers. It will be made from 18 mm MDF and the internal volume will be about 5 liters more as the original cabinet. The damping will be better, carpened bitume on the panels and BAF in the middle. The real fabrication will be done by an profesional, speaker & co from Haarlem, Netherlands. And the cabinets will be black, that i can do myself, i also do things like the xo placement, cables etc. Total height will be about 110 cm, so 14 cm heigher as the standard 105.4, and it will have a slim, more modern look if you'll sitting before them.

Here some drawings:




Last edited by willem-57 on Sat Apr 11, 2015 2:32 pm; edited 1 time in total
Back to top
View user's profile Send private message
speakerguru
VIP Contributor 750+


Joined: 18 Nov 2005
Posts: 954
Location: Green Hut, Tovil

PostPosted: Sat Feb 21, 2015 9:56 am    Post subject: Reply with quote

Speaking as the designer of the original 105.4, and unfettered by production considerations, I would be inclined to give each B 200 it's own enclosure, i.e. put a divider shelf in the middle of the cabinets. Each woofer would then be loaded by the identical closed box compliance. Any box resonances would be raised where they are easier to damp and may even be above the pass band of the crossover. At high levels there would be less interaction between woofers due to any unequal non-linearities. The one complication would be sealing the inter woofer wiring.
Back to top
View user's profile Send private message
willem-57
Senior Contributor 200+


Joined: 18 Jul 2014
Posts: 218
Location: Netherlands

PostPosted: Sat Feb 21, 2015 10:35 am    Post subject: Reply with quote

Thank you for the advise Idea I have already been in contact with the builder and he confirmed that you have a point there. Cosmetic it will be a little less beautiful because the 2 B200's have more distance from eachother. But sonicly it will be better indeed! So the new design will be with every B200G in it's own chamber. Very Happy
Back to top
View user's profile Send private message
SaSi
Senior Contributor 200+


Joined: 24 Aug 2008
Posts: 223

PostPosted: Sat Feb 21, 2015 11:43 am    Post subject: Reply with quote

The point where the two B200 "meet" will be the weakest of the front baffle. So it's better to make the spacing about 20mm and mount an internal chamber separator there.

You don't need to make the baffle space that much. You can use the flange widths for that - if you feel the drivers need to be that close to each other.

IMHO, the bass drivers don't really need to be that close together.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SpeakerTalk Forum Index -> KEF speakers All times are GMT + 1 Hour
Goto page Previous  1, 2, 3 ... 5, 6, 7 ... 10, 11, 12  Next
Page 6 of 12

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group