Martin's

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Originally Posted by Marco

Nice one, Martin - the Jantzen parts are excellent. I'd be very interested to hear of how it all comes together (with pics, of course), so keep us informed :)

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Sure Marco. I am getting tremendous help from Troels Gravesen here in Denmark; besides his experience he has shown great passion and talent for for speaker building and designing crossovers. Troels has done a lot of measurement on the 15" Tannoy Monitor Golds prior to this and my little crossover upgrade will eventually be covered/documented on his website. Thanks Troels!!!

http://www.troelsgravesen.dk/MG15XO_..._layout_v1.GIF
Troel's way of showing the diagram makes it so much easier to understand.
http://www.troelsgravesen.dk/MG15XO_...finished_2.jpg

http://www.troelsgravesen.dk/MG15XO_files/MG15-B_12.jpg

Looking good Martin - can't wait to find out what you think of the final result :cool:

Marco.

What a beautifully laid out board, but so many components for a two way... I suspect you can only get away with it so well because the speakers are so very efficient and the components are way over-specified...

Looks like the 3Khz "bump" may well be attended to as well. Glad this chap has measured what he's doing. It's the only way when so much is changed (for the better).

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Originally Posted by DSJR

What a beautifully laid out board, but so many components for a two way... I suspect you can only get away with it so well because the speakers are so very efficient and the components are way over-specified...

Looks like the 3Khz "bump" may well be attended to as well. Glad this chap has measured what he's doing. It's the only way when so much is changed (for the better).

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Yes Troels does a beautiful job, very thorough. Actually we have not added any components compared to original one.
http://www.troelsgravesen.dk/MG15XO_...5-XO_large.jpg
Just adapting the above template schematic doesn't work well for us and we are not getting the results that we want. There is no quick fix upgrade!!

The drivers can be perfected much more, but getting there will require individual tweaking for each driver (apparently no two TMG15" measure the same and requires individual x-overs to perform their best). So my final x-overs may end up looking different. Will keep you posted.

Marco and others with TMG15...please read this and report back.

http://www.troelsgravesen.dk/MG15XO-up-grade.htm
http://www.troelsgravesen.dk/MG15-problem.htm

The X-overs are in place. The speaker-cabinets have been fully re-veneered in oak and later varnished. They now have a nice milky transparent finish, semi gloss, where the oak-wood grain clearly shows; all grain lines are vertical now.

The speaker-grill cloth have been replaced with black cloth especially chosen for its transparent audio properties. The previous PA-grade was not very transparent - huge difference here. Underneath the cloth (except for the drivers hole in baffle) I have glued 2 mm black felt all over the baffle. This gives a nice fit and makes the cloth look even darker.

I had to make a new back door in order to cover the opening to the obsulete internal amp. The new 12mm birch "backdoor" now has 24 screws; all screws are now 4mm torx machine screws and they are fixed in steel screw-in inserts for easy future inspection. The screw-in inserts were screwed into to epoxy glue for a strong fix.

Around the back door-opening in the cabinet (underneath the edges of the back door) I have glued a foam sealing tape to insure an airtight seal.

On the back, in addition to the 24 cool looking machine screws you will find an alloy faceplate with gold WBT-terminals.

I have kept the original furniture wheels...still evaluating my options but something has to be done here. I need a better fit/connection to my wooden floor.

How do they sound now? Well...more of the good stuff that made me want these beauties in the first place and less of the drawbacks. The sound stage is huge as previous but the upper end is sounds better integrated. Its clearly more detailed now. I really love these Lockwood Majors....they are so much better than my Dali Euphonia MS4.

Hi Martin,

Sounds wonderful... Pictures please! :)

Marco.

No piccies of the finished articles, Martin.....? :(

Marco.

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Originally Posted by Marco

No piccies of the finished articles, Martin.....? :(

Marco.

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Sorry mate! Waiting for a daylight opportunity..this weekend looks promising.

You'll just have to :cool: