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Tgf05354 20th January 2021 01:30 PM

New guy need some help with old speakers
Posted this under full range which might be the wrong sub forum, so re-posting here.
Hi, looking for some advice. I broke the terminal on my Vifa d25AG35 tweeter and am looking at options for replacing or re configuring my speakers.

My system consists of 2 rather old custom made transmission line units which originally came with KEF b110 woofer and T27 Tweeter. At some point they were rebuilt using a VIFA p13 mid-woofer and the above mentioned D25 (which is no longer available). I also have a pair of 10 inch sub-woofer which I am Bi-amping with a 24db/octive electronic crossover at 90hz (I can also choose 120hz). Im using a pair of Adcom 5400 amplifiers rated at 125W per channel to drive the speakers.
Looking for options
Should I try and replace my current drivers?
Should I try full range with something like the Markaudio 7MS and eliminating the current passive 2 way crossover.
Should I consider a single drive open baffle design
Id appreciate some feedback with options, pros and cons, etc.

Thanks, appreciate any help. If you need more info let me know.

Tgf05354 20th January 2021 02:57 PM

I found out that I can repair my tweeter with a replacement soft dome voice coil. So I am going that route for expediency.

system7 20th January 2021 04:08 PM

Sounds like a plan, some good tips at Meniscus on Vifa voicecoil repairs:

Vifa D27 Voice Coil - Meniscus Audio

The original metal dome:

I don't suppose this new $30 Vifa would sound much different:

Tymphany, DA25BG08-06 - Meniscus Audio

MAAC0 20th January 2021 04:46 PM


I broke the terminal on my Vifa d25AG35 tweeter
Can't You try to repair the terminal ? I mean soldering & fixing / gluing a wire there ?
Is the voice coil damaged beyond repair ?

Tgf05354 20th January 2021 05:03 PM

it was Miniscus that suggested the soft dome rebuild. They also suggested the DA25 tweeter, but it would require a larger hole for mounting. Tough decision, but I am leaning towards the rebuild unless someone can give me a compelling reason to go with the Da25.

The terminal is not fixable in my opinion

system7 20th January 2021 07:12 PM

Only difference I see in mounting the newer metal tweeter is you'd need to file off a bit of timber to accomodate the terminals being diametrically opposed. A work of 5 minutes.

A soft dome has a slightly softer sound. They'll both work. No need to change as a pair. Tiny differences.

I think you could toss a coin on this one. :)

Tgf05354 20th January 2021 07:31 PM

You are correct the baffle hole is the same other than the terminals. I miss read the dimensions. I did order 2 voice coils just to be safe. I found the metal cones a little fatiguing so I'm hoping the slightly softer sound will be more enjoyable. Either way I think I'll be satisfied with the results. Appreciate your advice.

Moondog55 20th January 2021 07:42 PM

Personally I think the silk dome is a better mate for the P-13. I've done a few Frankentweeters using Vifa Parts and I have a set of aluminium domes here in a Frankentweeter if you were interested in them but the domes do have some small wrinkles.
Full tweeters tho not just the butterfly VC
PM me if interested

system7 21st January 2021 12:25 AM

I don't know if you like delving into crossovers, but there is a famous design by Mr. Lynn Olson that uses near enough your drivers, so would work:

Ariel Speaker Page

You would convert the bass filter to 2mH, 6,8R and about 5uF for a single midbass and attenuate the tweeter 6dB, Depends if you are happy with what you have. Lynn knows what he is doing, but always felt his design worked best with valves.

Tgf05354 21st January 2021 12:56 AM

Thank you for the crossover info. It was probably 25 years ago that I replaced the Kef units with the Vifa's. They came with 2 crossover boards each which are externally mounted. I'm going to see if I can still read the values of the components. Hopefully they're not to faded to read. This has reawakening the audio hobby that was dormant for many years.

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