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Trying to re-create my fathers setup

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Andrew123 View Drop Down
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    Posted: 12 Feb 2018 at 4:20pm
Hi Graham. Well you were right on both counts - the new woofers were quite a hassle to fit but the speakers now sound great. Thanks again for your suggestions.
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew123 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Feb 2018 at 3:12pm
Hi Graham

Thanks very much for the advise. I've sensibly taken it and ordered the Fane Sovereign drivers. I'll let you know how i get on!

Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2018 at 7:21am
I guess it's sag in the bass cone and that's pushing the voice coil out of alignment and so it catches causing the scratching noise. We have to remember that back in the day this was innovative but not fully researched or perfected as cones were later to become.

I would look into obtaining a paper surround replacement drive unit, something like a Fane Sovereign 500LF. I am sure you'd get good sound from it. I think such a low-compliance driver should help the cabinets produce an acceptable sound.

In fact, the 12-300 should do it!

https://www.thomann.de/gb/fane_sovereign_12300.htm

This being 8 Ohms and your Leaks maybe 15 Ohms? The simple crossover might well produce a decent sound, and the mid/tweeter would be attenuated by comparison meaning you could place them away from the walls and could get a decent tonal balance.

The fit might be a fiddle. Would I do it? Yes, but I'm an experimenter...


Edited by Graham Slee - 28 Jan 2018 at 8:01am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2018 at 6:20pm
Sounds likely Andrew. Yo7 could try by taking the drivers out and rotate them 180 degrees.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew123 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2018 at 5:00pm
Hi Graham

So I took the speakers to a friends house with a Quad 44 + 404 power amp. As you predicted they were exactly the same - very scratchy. Probably even worse than before. Bought them home and left them for a few days and thought about where I could use them as coffee tables.

Then a rather surprising thing happened. I was about to bring them into another room when i thought I'd give them one last go - and they worked absolutely fine. In fact rather well. Then i noticed that I'd left them upside down - the only thing that denotes which way up they are is the LEAK text along the top. 

Could it be that the cones on the woofers have dropped over the last 30-40 years and were rubbing on the magnets and turning them upside down has pulled them away? If so I could spin them around 180 degrees and turn them the right way up again. If it takes another 40 years for them to drop again I probably won't be around to hear it.
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2018 at 12:58am
Hello Andrew, I'm afraid I don't think driving them with a bigger amp will make much if any difference. It would seem you are witnessing the same scratching noise as I and many more people have. I do understand what you are trying to achieve and your fond perhaps nostalgic memories and feelings - I'm a softy too, but I think you may end up moving the Leak speakers on. They're old and time has taken its toll. They will only perform (if you get them working properly) stood with their backs to the wall. They need that to do any worthwhile bass. And placed like that they will not image. If I'd had the room (and more to the point if I'd got WAF) I would have used the best pair unmodified as furniture. Admittedly they do look the part. And apologies if you think my reply unhelpful or insensitive.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew123 Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jan 2018 at 10:26pm
Hi. Thanks for getting back to me.

Yes - it is the polystyrene/aluminium driver. Taking them apart sounds a bit scary! 
I'll see if i can find some instructions.

I'm going to test them on a more power power amp just in case the old Quad has seen better days. Probably worth a check.

Should have bought those Leaks you renovated a while ago!
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