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nkg 12th February 2007 11:32 AM

Goodmans 200C 12inch fullrange speaker
I bought a pair these speakers and was wondering if any body out there knows the specs for these speakers.

maxro 12th February 2007 09:33 PM

I've got a pair of Goodmans Twinax 220cs which, IIRC from a recent ebay auction, look exactly like the 200c.

I finally got around to measuring them recently:

Driver A:
Fs 32.3 Hz
Re 12.2 Ohm
Qms 13.33
Qes 1.02
Qts 0.945

Driver B:
Fs 31.7 Hz
Re 12.6 Ohm
Qms 11.27
Qes 1.01
Qts 0.927

Not bad for consistency. Fs matched within .5 Hz, Qt within 2%.

I started trying to calculate Vas with added mass, but was getting inconsistent results. Given the high Qt of these, I'll be using them on open or U baffles, so Vas is moot anyhow.


nkg 13th February 2007 10:09 AM

Thanks Maxro for your reply they do look identical I am new at this so I am not sure how to measure them so I will have to do some more homework but thanks for the start.

AMV8 13th February 2007 12:11 PM

Hi nkg

I still own a pair that I bought many years ago - my first real speakers. I also own Goodmans 12 base units, 8" units and mid and treble horns.

The 12" base and full range units were originally designed to be used in large cabinets with a restricted vent. The cabinet size was approx 1.3m high 0.6 m wide and 0.4m deep. The vent was approx 30cm by 20cm and covered in fine loose felt held on a metal mesh. The instructions did say that the vent could be partly uncovered or additional covering added depending on the room. If the cabinet is rigid they produce truly great base and go very low. I only stopped using then due to the growing frequency of requests for a smaller speaker - they do sort of dominate the room. I eventually built corner brick enclosures in my last house and that really worked!

I think I also have the crossover frequency information if you want that.

Hope that helps

nkg 26th February 2007 11:33 AM

Thanks AMV8 sorry I haven't replied eariler.

MykhailoM 25th February 2013 01:03 PM

Goodmans twinaxiom 200c Woofers
Hay Folks, can anyone please have a look at my Godmans 12" Twinaxiom 200c Drivers to check whether they have ORIGINAL Woofer layers in them or it should actually be pressed paper instead of some sort of plastic on them.

Here is the link to my Photos:

Many thanks

maxro 25th February 2013 04:55 PM

That's original. They are pressed paper with some sort of foamy shiny plastic coating on the front side.

MykhailoM 3rd March 2013 02:52 PM

Technical Paarameters or Specifications
Hay Guys is anyone can find the specification information for Godmans 12" Twinaxiom 200c Drivers ?

Many Thanks

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