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  1. #1
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    62

    Default Goodmans triaxioms

    In the course of readying a clients house for rental I was asked to remove and dump the speakers that were built into the upper corner of the lounge room, big boxes about 1.5m x .75m x .5m. I put them in the back of the ute and fortunately ( I think) I was too late to make it to the tip, so they ended up at home. My son talked me into trying them and to my surprise they sounded really nice, looking inside revealed a pair of Goodmans 212c triaxioms, 12" three way coaxial with level controls. Its been a long time since I listened to a pair of Tannoys; is my memory failing me or are the Goodmans nearly as good?

    The boxes suffered when pulled off the wall and being an odd shape are not really usable, I've been unable to find any info on box dimensions using google, do any forum members have links or info on box dimensions, any help is appreciated.

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  3. #2
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
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    2,810

    Default

    A good starting point would be to duplicate the originals, as either the speaker manufacturer or a third party manufacturer spent big bucks getting it right the first time. Small variations in size, shape, porting arrangements etc can make big changes (normally detrimental).

    Beyond that, some of the pre 80's texts on audio systems will discuss how to measure the accoustic parameters of the drivers and design approrpriate cabinets to extract optimum performance from the drivers.

    Yes, Goodmans did make some very nice drivers in the past, my father used some of their cinema sound drivers back in the 50's, when 5 W RMS was enough to provide decent sound in a 200 seat theatre. Unfortunately, I was more into Tannoys when I was offered the drivers in the late 80's, so they ended up going to god.

    Take good care of them, don't bi amp them or triamp them, and stick to moderate power level amps so that you don't overdrive them. If you are tempted to try to measure their parameters, stick to low power levels. I can advise from experience (I wasn't the panel op thank god) that these coax speakers do not like a lot of drive into the HF drivers. Someone hit the wrong switch on a new mixer in a new studio and dumped 150W RMS at 10KHz into a pair of Tannoy HF drivers. I had the waveform recorded for many years, one lasted 3 cycles and the other 4.5. Didn't hurt the amp one bit, it shut down and reset quite happily 5 seconds later, but there were no voicecoils in the drivers.

  4. #3
    Join Date
    Nov 2007
    Location
    Dundowran Beach
    Age
    76
    Posts
    19,922

    Thumbs up

    Goodmans were amongst the very best speakers ever made, especially considering the technology and accustic knowledge of the times.

    Wharfdales were the hot to trot speakers of the day but the Goodmans were a much smoother speaker and, in he opinion of many, the better of the two.

    It may be possible to track down old designs for the enclosures, but it seems the existing enclosures could be the go for a good design.

    BTW__ Lucky you.

  5. #4
    Join Date
    Apr 2006
    Location
    Hobart
    Posts
    5,107

    Default

    Goodmans are good speakers and its worth doing maintenance on them such as replacing the rubber surrounds if they have deteriorated. There are lots of designs for enclosures available and also excellent software for designing same. The science is now known, whereas it was largely trial and error plus experience when your Goodman enclosures were made.

    Hope Neil does not mind, but you would probably be better off posting your query on a specialist forum such as www.diyaudio.com

    Cheers

    Graeme

  6. #5
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    62

    Default

    Thanks for the replies, I did note the dimensions of the boxes that they came out of, and failing any extra info this is what I'll probably do. Just have to wait until #3 son moves out so I can set up his room as a listening room/library, our lounge is really too small for such large enclosures. The plan is to build valve amp, I've got a stash of valves from many years back and after almost tossing them out a few times in the past it's good to find a use for a few of them.

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