MC4/ Morel Supreme

[krismusic]

Hi. I have a pair of the original Musical Fidelity MC4's. I am thinking of replacing the metal dome tweeter with the Morel Supreme https://www.wilmslow-audio.co.uk/cat...5rkiogeedgt903
Does this sound like a worthwhile project?

[Inductor]

Originally Posted by krismusic

Does this sound like a worthwhile project?

Interesting and expensive...
Do you change the xover?
http://www.morelhifi.com/products/pd...t%20ST1048.pdf
http://www.clofis.nl/nl/seas/H0414%2019TAFG.PDF
Faceplate and inside diameters are different. The res.freq is high for the SEAS. 1700Hz. What might not matter with/if a very high xover freq. on the Musical Fidelity MC4. Better with the Morel Fs=680Hz. If you can afford the money on those old speakers (?) I would go forward.

[krismusic]

Hi Inductor and thanks for the reply.
It will be very useful to have the specs of the MC4 tweeter.
I know nothing about the technical aspects of what I intend but have a very knowledgable friend if I run into problems.
I have been speaking to Neil at Wilmslow Audio and he is very helpful too.
I am hoping to use the existing cross over.
I am a woodworker so adapting the baffle to acept a diferent tweeter should not be too dificult.
A better question to ask the forum may have been " Is changing the tweeter on a well designed commercially produced 'speaker likely to result in improvement?"

[David Gatti]

Very hit and miss project unless you plan to remeasure the drivers and redesign the crossover.
Try finding a tweeter with near identical specs (frequency response and impedance curve) for a straight swap. Check out the Vifa and Seas line. No need to spend more than 50 pounds per driver. Also think about upgrading the crossover components while you're at it.

[krismusic]

Hmmm. Looks like I am going about this the wrong way. Maybe I should be looking for someone knowledgeable on here to reccomend me a tweeter and build me a crossover. Any suggestions? Thanks for the help so far. You have saved me from an expensive mistake.

[alan-1-b]

Kris, go to: HIFICRITIC, audio review magazine, hi fi critic - and join-up,
then start a titled "Musical Fidelity MC4" thread there in the Forum's DIY HiFi section - its designer might reply !

[krismusic]

Originally Posted by alan-1-b

Kris, go to: HIFICRITIC, audio review magazine, hi fi critic - and join-up,
then start a titled "Musical Fidelity MC4" thread there in the Forum's DIY HiFi section - its designer might reply !

Wow! That would be quite something. Thank you very much for the link.

[Inductor]

Originally Posted by alan-1-b

Kris, go to: HIFICRITIC, audio review magazine, hi fi critic - and join-up,
then start a titled "Musical Fidelity MC4" thread there in the Forum's DIY HiFi section - its designer might reply !

Better it does... I don't have to spend more time reading this thread...

[krismusic]

Originally Posted by Inductor

Better it does... I don't have to spend more time reading this thread...

[Toaster]

If it's the original MC-4 with the rectangular Elac metal dome tweeter I doubt there was any significant response shaping going on in the crossover. I must've had about the first of these in amateur hands for a DIY design. Assume about 90dB/ Watt for the driver, although the overall system sensitivity may have been lower. I should think the nearest thing would be the SEAS 27TBFCG, even down to the slight roll off at the top end. The Elac was the usual nominal 6 Ohm impedance, IIRC, and had a back chamber like the SEAS, so the fs and corresponding impedance peak should be out of the way of the crossover frequency. It might well just drop in acoustically and electrically- but sadly not physically! If the tweeters are still working and you are looking for an improvement, the Elacs still sound pretty good by modern standards, but there's lots of choice for alternatives apart from the Morels, many of them cheaper and arguably as good or better. You may just get different rather than better though, in the context of the MC-4. On balance I'd probably stick with the Elacs until they break...