Martin Logan xover ugliness and rebuild

JCarney · « **on:** 22 Oct 2022, 10:13 pm »

I have an old pair of ML Scenarios that I have had for 20+ years. I've decided to give them some love due to wear and tear from moves, and my youngest having them for awhile. I pulled out the xover and much to my horror I saw a no-no of the highest caliber in xover layout. I'll let the pic tell the rest.

JCarney

FullRangeMan · « **Reply #1 on:** 23 Oct 2022, 12:19 am »

But its not Made in USA?

JCarney · « **Reply #2 on:** 23 Oct 2022, 12:52 am »

I believe they were made in Kansas, but I"m probably wrong. I do know the Scenario was launched in 1999.

JCarney

FullRangeMan · « **Reply #3 on:** 23 Oct 2022, 01:21 am »

This is a Cary 572 assembled in Cary NC factory.

DannyBadorine · « **Reply #4 on:** 23 Oct 2022, 02:53 am »

Are you going to update the crossover? New caps (preferably better quality) and lay out those inductors in a way that they won't interact?

JCarney · « **Reply #5 on:** 23 Oct 2022, 02:58 am »

Yes I am DannyB, yes I am.

JCarney

Letitroll98 · « **Reply #6 on:** 23 Oct 2022, 09:47 am »

If I hear one more time, "the engineers who designed your product certainly know more than you about how to design it" I'll scream.

JCarney · « **Reply #7 on:** 23 Oct 2022, 12:25 pm »

Quote from: Letitroll98 on 23 Oct 2022, 09:47 am

If I hear one more time, "the engineers who designed your product certainly know more than you about how to design it" I'll scream.

JCarney

JCarney · « **Reply #8 on:** 24 Oct 2022, 04:34 pm »

I wanted to give a shout out to Martin Logan customer support. I emailed them this morning asking for the schematic and values for the Scenario crossover. Less than a half an hour later, I had a response with the schematic and values of the crossover wishing me best of luck with my project. I am very impressed and pleased. Thank You Martin Logan.

JCarney

artur9 · « **Reply #9 on:** 25 Oct 2022, 03:27 am »

Looks like the Flying Spaghetti Monster lives there.

JCarney · « **Reply #10 on:** 25 Oct 2022, 03:27 pm »

So I had never of the Flying Spaghetti Monster, so I looked it up.

JCarney

JCarney · « **Reply #11 on:** 31 Oct 2022, 06:22 pm »

I have both boxes braced and one box lined with Canopus deadening material. I placed my order for crossover parts this morning, and I'll order tube connectors from GR when I'm done here. Couple of progress pics.

JCarney

Zuman · « **Reply #12 on:** 1 Nov 2022, 12:46 am »

Pretty compelling demonstration here: https://www.youtube.com/watch?v=00tTZyLQ8-I

JCarney · « **Reply #13 on:** 1 Nov 2022, 01:17 am »

Thank You Zuman, that will help me with my layout. I've decided to go outboard with the xover, so I should be able to space them to minimize interference.

JCarney

JCarney · « **Reply #14 on:** 3 Nov 2022, 09:11 pm »

Some of the parts have arrived for the rebuild, and the rest are on their way.

JCarney

JCarney · « **Reply #15 on:** 7 Nov 2022, 07:38 pm »

I had to have one of the baffles that holds the panel replicated due to cracks in the original at a critical spot. I was just notified it is completed and I will pick it up in around 3pm. My xover parts come in on Weds. so I can finally get going on that.

JCarney

JCarney · « **Reply #16 on:** 9 Nov 2022, 05:07 pm »

Parts arrived!

JCarney

Tyson · « **Reply #17 on:** 9 Nov 2022, 05:28 pm »

Will they actually fit?

JCarney · « **Reply #18 on:** 9 Nov 2022, 05:39 pm »

Quote from: Tyson on 9 Nov 2022, 05:28 pm

Will they actually fit?

No, no they won't fit on the original board. I knew going in that the xover was going outboard. I'll build a box and the cover will be plexiglass. The 330uF is just a little less in diameter than a soda can and just as long. The 100uF is bigger around than a soda can, and about 40% the length of a soda can. Yikes

JCarney

JCarney · « **Reply #19 on:** 11 Nov 2022, 10:46 pm »

I've been playing around with parts placement on the board and I think I'm getting closer to what I want to accomplish by separating the inductors and transformer. I can finally see a picture that makes sense to me. My wife has a much better spatial recognition and placement than I do and she was absolutely wonderful helping me get to this point.

She's awesome!

JCarney