The Mission 752 Freedom was well reviewed in Gramophone back in 1997: https://www.gramophone.co.uk/features/article/review-mission-752-freedom-loudspeaker
Quote: "These loudspeakers seek not to grab your attention with bravura displays of sparkle and punch but to woo you with elegance and sophistication. A most enjoyable experience."
That further justifies keeping the crossover components exactly as they are in order to maintain that 'easy on the ear' sound you obviously prefer.
Quote: "These loudspeakers seek not to grab your attention with bravura displays of sparkle and punch but to woo you with elegance and sophistication. A most enjoyable experience."
That further justifies keeping the crossover components exactly as they are in order to maintain that 'easy on the ear' sound you obviously prefer.
Thank you Galu. I have not seen that article but they indeed seem a very nice listen and subjectively have more punch than either my previous Stirlings and the the KEF LS50 Wireless 2 (active) before that. Just really engaging. A lucky find for next to nothing money. If I can get them back to original glory both inside and out that would make me very happy.
Funny this, I wasn't exactly breaking my head over it but I was contemplating for a while which way to go for the rear chamber tweeter damping and what to get. I just realised it was staring me right in the face, on top of my speakers ... . That should do it, if done correctly.
That looks like it may be closed cell foam. For your purposes you need open cell foam which is more effective in absorbing high frequencies.
You can test your foam by putting some water on it.
If it is closed cell foam it won't absorb the water, unlike open cell foam which will.
You will find open cell foam in a kitchen sponge scourer.
If it is closed cell foam it won't absorb the water, unlike open cell foam which will.
You will find open cell foam in a kitchen sponge scourer.
And while you’re there, get a wonder sponge. That (melamin) foam does an excellent job in sound absorption.
Thanks @markbakk - that's an extremely useful tip!
Sorbo Wonder Sponge:
Three of our UK pounds for a pack of four at that well-known online shopping emporium!
Sorbo Wonder Sponge:
Three of our UK pounds for a pack of four at that well-known online shopping emporium!
I looked into the properties of Melamine Foam, including its outstanding sound absorption performance in the high frequency range.
https://melaminefoamtech.com/melamine-foam/
https://melaminefoamtech.com/melamine-foam/
Well, I've ordered some melamine foam so that will be the next step. I have a question regarding the rubber surrounds of the main driver. Is there anything that actually needs doing to prolong their life. They are permanently covered and not exposed to sun light and they look fine. Is there anything to be gained by using a 'rubber care' product?
The surrounds will not be natural rubber.
They are almost certainly PVC, in which case no rejuvenation product is necessary.
They are almost certainly PVC, in which case no rejuvenation product is necessary.
Ok, last thing done on the tweeter. A friend with a suitably equipped workshop could have drilled the pole piece but I figured a/ it wouldn't make much difference and b/ there was a chance of destroying the magnet plus I very likely would have had to replace the ferrofluid again due to metal contamination. So I didn't bother. Anyway, thank you all for the kind suggestions. This little embarkment is probably child's play for you guys but I have two left hands which became obvious when I made a notable dent in the dome during the procedure. Being a soft dome it immediately disappeared. Had it been metal ... . I even managed to make a kind of dome shape of the melamine foam piece 🙂.
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I have noticed that the connections to the terminals, both the nuts and o rings are magnetic steel. Would I get any benefit replacing them with copper parts? Than you.
https://youtu.be/rmeUq01DOBs?si=-U3DTGM6355Z5GWN
https://youtu.be/rmeUq01DOBs?si=-U3DTGM6355Z5GWN
If you want to really be an audiophile take Danny's advice (GR Electronics) or something like that and replace the steel screws with brass. Apparently it makes for huge sonic improvement 🤔
You can replace with brass which is an alloy of copper and is not ferromagnetic.
However, I would not expect this to have a measurable effect on the performance of the tweeter.