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Goodmans Magnum K2
Goodmans Magnum K2
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Old 15th December 2009, 05:34 PM   #1
shortbloke is offline shortbloke  United Kingdom
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Question Goodmans Magnum K2

Hiya,

I've managed to procure all the ingredients (i.e. drivers and crossovers) for the afortementioned speakers and need some help with cabinet dimensions and wall thicknesses etc as I can't seem to find any info regarding these and will need to construct them. Also any infon regtarding the crossovers and suitable replacements would be much appreciated! (not much to ask, I know..!)

Thanks in advance!
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Old 15th December 2009, 06:31 PM   #2
planet10 is offline planet10  Canada
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Goodmans Magnum K2
The ones i dissassembled (i think that is what they were, shiny platiciced paper 12" woofer?) used 3/4" material, and i'd guess were about 2 ft^3 (i may actually have that recorded somewhere -- poke me if i don't remember to look it up)

dave
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Old 18th December 2009, 04:06 PM   #3
shortbloke is offline shortbloke  United Kingdom
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Ah! Thanks Dave - I'll poke you in a few days then if I haven't heard
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Old 18th December 2009, 07:23 PM   #4
planet10 is offline planet10  Canada
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Goodmans Magnum K2
Turns out it was a magnum XL i had. 1.76 ft^3 (50 litres).

12" woofer, picture attached.

dave
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File Type: jpg goodmans-magnum-sl-12W.jpg (110.1 KB, 262 views)
File Type: jpg magnumSL-12W.jpg (22.1 KB, 239 views)
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Old 19th December 2009, 01:48 PM   #5
shortbloke is offline shortbloke  United Kingdom
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Nevermind, thanks for taking the time to look into it! I've managed to find the external dims (H60cm x W38cm x D29cm). 0.75" (1.9cm) sounds about right for the cab. wall thickness, so taking that into account it comes to 29.22 litres or 1.03 cu ft. Would that really be big enough for the claimed 30 Hz? If I can't get the original cabs from the ebay seller I won the parts from, I may make some adjustments to the new cabs, such as increasing the size, adding bracing and maybe some rounding of the corners...we shall see though. I am pretty anal about certain things, hifi equipment being one of them, so am looking for a suitable tweeter replacement for these speakers as they don't match (aesthetically). Any ideas people?

Cheers,

Jamie
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Old 19th December 2009, 01:50 PM   #6
shortbloke is offline shortbloke  United Kingdom
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Those are pretty spanking looking woofers you've got there! Are they originals that you've refurbished or have you bought some new ones?
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Old 19th December 2009, 04:46 PM   #7
planet10 is offline planet10  Canada
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Goodmans Magnum K2
THose are the original woofers. The same kind of tech (but 10" & a cast basket) was made for Radford as the BD25.

The Goodmans boxes could easily be surpassed... just make sure you use plywood.

dave
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Old 19th December 2009, 07:38 PM   #8
shortbloke is offline shortbloke  United Kingdom
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Oh, not mdf? Why's that?
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Old 19th December 2009, 11:14 PM   #9
planet10 is offline planet10  Canada
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Goodmans Magnum K2
Short answer: MDF is not a very good material for building speakers out of.

Long answer: http://www.diyaudio.com/forums/const...akers-out.html

dave
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Old 20th December 2009, 06:38 PM   #10
shortbloke is offline shortbloke  United Kingdom
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Ok, I have the drivers and am well happy with them...well, the woofers at least. The tweeters are mismatched (only one says "Goodmans" on it - the other looks completely different and has a different dome material too) and the mids' diaphragms are holding on by the skin of their teeth. Still, 22GBP for the woofers, I think, is a bargain. So I'll have to check out replacement tweeters and 3" mids too. If you have any suggestions, please get in touch - if not, wish me luck!!

Jamie

Last edited by shortbloke; 20th December 2009 at 06:41 PM.
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