Goodmans Magnum K Refurb and Modification (part 2)

A place for DIY project discussions.
User avatar
Dr Bunsen Honeydew
Posts: 30758
Joined: Wed Jul 11, 2012 7:26 pm
Location: Muppet Labs
Has thanked: 0
Been thanked: 48 times

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Dr Bunsen Honeydew »

No, but it is still suck and see as things wont be changed that much.

Tim Catt
Posts: 62
Joined: Wed Nov 06, 2013 11:19 pm
Has thanked: 0
Been thanked: 0

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Tim Catt »

Fair enough. Thanks doc.

User avatar
Dr Bunsen Honeydew
Posts: 30758
Joined: Wed Jul 11, 2012 7:26 pm
Location: Muppet Labs
Has thanked: 0
Been thanked: 48 times

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Dr Bunsen Honeydew »

It was my decision I would use no crossover components on the bass driver but dope it, I would have a series capacitor on the mid driver to protect it from too much bass and leave it full range upward and dope the cone. I would use a single series capacitor on the tweeter to protect it.

But if you want to avoid doping then this will help you calculate a 3 way 1st order crossover. But you still have to use your ears especially for sensitivity.

http://www.kbapps.com/audio/speakerdesi ... ulator.php

Tim Catt
Posts: 62
Joined: Wed Nov 06, 2013 11:19 pm
Has thanked: 0
Been thanked: 0

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Tim Catt »

Dr Bunsen Honeydew wrote:I have never heard of a 3 ohm tweeter.

Anyway suck it and see if you want to.
The original magnum paper tweeters definitely measure 3ohms out of circuit. Is this good or bad for 3 way design?

Doc, I've given your suggestion of doping considerable thought and while I'm in agreement that this method is capable of producing superior results, I seriously doubt I have got the required skill or experience to achieve such results. I feel the same way about the first order crossover.

As it happens the tweeters I took from the Mezzo's are SEAS h-087's and imho are excellent. They have offered what i felt was missing from the Magnums which was that top end sparkle which completely detracted interest from the higher frequencies produced by snares and symbols mainly.

So for now my problem is solved but I'm interested to know what 'order' xover is already fitted into the Magnums because now that I've removed the lpads there is only really two caps and two inductors (not sure what they do) and that's it? :think:


Tim Catt
Posts: 62
Joined: Wed Nov 06, 2013 11:19 pm
Has thanked: 0
Been thanked: 0

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Tim Catt »

Cheers Doc.

Tim Catt
Posts: 62
Joined: Wed Nov 06, 2013 11:19 pm
Has thanked: 0
Been thanked: 0

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Tim Catt »

Hi Doc, Ronin is currently trying remove the l-pads from his magnums and I was trying to assist (probably blind leading the blind) as I have completed this mod, however my xover has a resistor where Ronin's doesn't and I cant work out where things are supposed to go in the absence of the resistor?

As always, your help will be greatly appreciated!

User avatar
Dr Bunsen Honeydew
Posts: 30758
Joined: Wed Jul 11, 2012 7:26 pm
Location: Muppet Labs
Has thanked: 0
Been thanked: 48 times

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Dr Bunsen Honeydew »

I will need photos as I am not there to look and I don't have the speaker. I would say just bridge the whole thing out of circuit and listen. It will probably need a fixed resistor in place of the pot you have to judge by ear but start with nothing.

Tim Catt
Posts: 62
Joined: Wed Nov 06, 2013 11:19 pm
Has thanked: 0
Been thanked: 0

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Tim Catt »

ronin xover.jpg

Tim Catt
Posts: 62
Joined: Wed Nov 06, 2013 11:19 pm
Has thanked: 0
Been thanked: 0

Re: Goodmans Magnum K Refurb and Modification (part 2)

Unread post by Tim Catt »

Cheers Doc, I've just added an image of Ronin's xover on this post. What are your thoughts?

Post Reply