Sorry, it has been a very busy time and i didn't have a ready answer so it got shunted aside for later -- thanx for the poke (no-one should ever be worried about giving me a poke, i appreciate them if i've missed something i should have done).
I have pretty much abandoned dome tweeters and try to avoid any XOs between 300-5k so don't have sufficient experience to give an adequate answer to that question. One of the reasons that i'd consider replacing the top 3 drivers with a single one, going active, and pushing the XO down to the baffle step (about 225 Hz in the box in question). I'd suspect any change in tweeter will require XO work.
dave
All these old speakers were expecting the source to be vinyl and the high frequency units one would choose often changed with the advent of the CD, never mind improvements in speaker unit manufacture, amps, etc. If you like vinyl and/or old rock music then a metal domed tweeter might be a better choice than a fabric domed one. What I'm saying is find a pair of speakers you like listening to with your type of music and your type of source and see what tweeter it uses. I'm afraid that the best ones are usually the most expensive! So long as it will cross over at a frequency compatible with your bass/midrange then 'all' you have to do is design the crossover. Yes, that may be the hardest part. You will have to enlist some local help or climb a learning curve. Have fun ;-)
No worries Dave, I appreciate that others are often busy with other things. My pc has been down too and I've been working away so I could just as easily have missed a reply.
Yes Geoff it looks like a learning curve will have to be established. I know it can done, I just don't have the fine details.
Your point about my speakers and vinyl is very good one and something that's never crossed my mind before. I've just bought some new amps and I'm using them with some TDL Studio 4s, again probably more at home with vinyl. I've been evaluating the system today via cd and wondering why I enjoy vinyl so much more......
Yes Geoff it looks like a learning curve will have to be established. I know it can done, I just don't have the fine details.
Your point about my speakers and vinyl is very good one and something that's never crossed my mind before. I've just bought some new amps and I'm using them with some TDL Studio 4s, again probably more at home with vinyl. I've been evaluating the system today via cd and wondering why I enjoy vinyl so much more......
When I was in the UK I bought a pair of C.Rogers TLs. This was in the in the early 70s. Have carried them round the world until I reached final resting place in NZ. These have served me well. Late last year I decided to have another pair made with XOs from Accoustic Sound. The bass is still awesome, the midrange seems to be a lot clearer, the highs just as good. They are an on-going project as "er indoors" has given permission to update the drivers as NOS becomes available.
Hi,
If it ain't broke, don't fix it, its a lot easier to replace the supertweeters
with no crossover mods, possibly only an L-pad on the supertweeters.
e.g. H0737 - Seas 19TFF1 0,75 inch tweeter - Europe Audio
or double the price, the origiinals, Coles 4001K Super Tweeter
rgds, sreten.
Kef Concerto crossover upgrade
I have tried to get information about AusKef or Falcon 53 crossover for KefKit3/Concerto. colin@hifiloudspeakers..info or Falcon propably have the information, but Falcon did not respond to my inquiy, e-mails to colin@hifiloudspeakers.info keep coming back as not delivered.
Do anybody know e-mail adress where colin can be reached, he probaly has best knowledge abouty Kef issues.
If anybody has scematics for AusKef or Falcon 53 crossover, it would be nice to get these. As far as I have understood these are quite similar to Kef Cantata or C7-3 Kit crossovers. Kit 3/Concerto used T27/SP1032, B110 SP1003, B139 SP1044 drive units. Cantata used SP1057 mid and T52 tweeter and C7-3 SP1057 mid and T33 tweeter, B139 was similar on all models. So even scematics propably were quite similar, component values must have been quite different.
I suppose idea was to use lower and steeper crossover between mid/bass to reduse effect of 1khz resonance of B139. Also upper crossover was propably modified to follow closely as possible to 18dB butterworth caracteristics.
I am quite shure that this would be quite improvment to ancient DN12 crossover. Resulting speaker might be even better sonically than Cantata or C7-B due fine performance of T27. I suppose that T33 and T52 were improvments only on power handling to T27.
So if anybody has any information about AusKef or Falcon 53 crossoover, let me know.
I have tried to get information about AusKef or Falcon 53 crossover for KefKit3/Concerto. colin@hifiloudspeakers..info or Falcon propably have the information, but Falcon did not respond to my inquiy, e-mails to colin@hifiloudspeakers.info keep coming back as not delivered.
Do anybody know e-mail adress where colin can be reached, he probaly has best knowledge abouty Kef issues.
If anybody has scematics for AusKef or Falcon 53 crossover, it would be nice to get these. As far as I have understood these are quite similar to Kef Cantata or C7-3 Kit crossovers. Kit 3/Concerto used T27/SP1032, B110 SP1003, B139 SP1044 drive units. Cantata used SP1057 mid and T52 tweeter and C7-3 SP1057 mid and T33 tweeter, B139 was similar on all models. So even scematics propably were quite similar, component values must have been quite different.
I suppose idea was to use lower and steeper crossover between mid/bass to reduse effect of 1khz resonance of B139. Also upper crossover was propably modified to follow closely as possible to 18dB butterworth caracteristics.
I am quite shure that this would be quite improvment to ancient DN12 crossover. Resulting speaker might be even better sonically than Cantata or C7-B due fine performance of T27. I suppose that T33 and T52 were improvments only on power handling to T27.
So if anybody has any information about AusKef or Falcon 53 crossoover, let me know.
Hi Geoff,
I am going to build a pair of these soon and was wondering if you would be so kind as to let me have a copy of this updated information. I too built a pair of these TL's in the seventies and was amazed by their stunning bass. I am toying with the idea of using an old pair of Linn Kan drivers for the Treble and Mid drivers with their crossovers, then use the original bass crossover for the B139's when and if I can find some.
Thoughts anyone?
Yes something similar has been going through my mind recently but with the mid and treble driver in their own enclosure sat on top of a TL enclosure. Something LS3 5A came to mind so we're on the same track but I reckon there are better mid/treble combinations available now than the ubiquitous B110/T27 and for less money too. I think I'd stick with the good old B139 though for the TL cab as I can't think of a modern equivalent that would give the same bang for the bucks.
Incidentally just like Sreten suggested I repaired my IMFs with a new pair of Coles units and I've been very happy with them 🙂
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