HISTORY:
Never heard of MORDAUNT SHORT? One of the better loudspeaker design and manufacturing companies formed in Great Britain (London) in the late 1960's and very proud of it! Mordaunt Short products were extensively labelled and marketed as MADE IN GREAT BRITAIN
Mordaunt Short (the company) was bought out by TGI around 1987, this is the same company that had also purchased Tannoy and Goodmans Loudspeakers.
Those who used and listened to their systems were not disappointed either, we had a nice Pageant system a LONG time ago and much later our studio guys wanted to listen to some MS20's to compare with their near-field Tannoys (mid sized bookshelf style) The MS20's were actually released during the period 1987 ~ 1993 in different "reincarnations" and I am pretty sure the set we had (and are now being offered as "organ donors") were from the early 1990's (TGI) period.
I have included a photograph of the rear label for identification purposes.
Rear ported, particle board sides/top/bottom and an extremely tight fit/secure polycarbonate/PVC front and rear - quite difficult to get "inside" and once there, I was stunned at the driver mounting used! It actually seems to be permanently embedded into the front panel! See my listing for the drivers to know more about what I found ...
I am clearing up ALL the ex studio and auxilliary equipment from our audio post production days, this MS20 SPARE PART is one of those items.
So what happened to the MS20's? (I hear you ask enquiringly)
They were often used by the sound engineer and "pushed" pretty hard, something that the MS20's don't like very much (much more suited to near field/lower listening levels) and as often happens, this resulted in one tweeter failing (burned out voice coil) After careful consideration I have decided that the usefulness of the MS20's was probably in the components it can provide rather than a complete non-functioning system, so here we go with this MS20 spare part ...
Please note, I have referred to this tweeter as 1 Plus 1, Why? I hear you ask (puzzled look on face)
As mentioned above, one tweeter voice coil was "cooked" but I am very much into sustainability, saving our landfill from ewaste and Ee - What is Ee? Take a look HERE
This advertisement is for ONE Tweeter which is fully functional, no problems at all. It's partner in crime has the open circuit voicecoil and it is also included in this advertisement - meaning two tweeters will be supplied, one working and one not.
FULL details are below, this second tweeter can be bought back from the dead! Read below ...
MORDAUNT SHORT - Loudspeaker Component (2) ONLY
PART: Tweeter (1) Fully functional Plus Tweeter (1) NOT functioning (open connection to the voice coil)
Part #: 91000899302
Ex MS20 Loudspeaker system
Soft metal dome
25mm
8 Ohm nominal impedance
74mm diameter magnet
COSMETIC CONDITION:
TWEETER 1:
NO damage to the tweeter mounting frame at all
Light crushing showing to the soft metal centre dome
Terminals are undamaged
TWEETER 2:
NO damage to the tweeter mounting frame at all
Again, light crushing showing to the soft metal centre dome
Terminals are undamaged
One very fine wire from the voice coil to the spade connector has gone open circuit - this is JUST visible! (Extremely small)
To discover this I needed to carefully remove the voice coil from the magnet, unfortunately I did not store the magnet correctly and the ferro fluid (brown marks on the magnet) needs to be "refilled"
All the original mounting screws are included
TESTING:
TWEETER 1:
Fully functioning prior to removal from the MS20 system
DC resistance measured at 4 Ohm
Nice sound when installed in the MS20 although I know other MS20 users do upgrade these tweeters in an attempt to achieve better Hi End performance
TWEETER 2:
Open circuit due to an open circuit in one wire from the voice coil to the terminal. This wire was intended as a type of "fuse" and Mordaunt Short used to supply "fuse kits" but that was a LONG time ago.
It is feasible to bridge this open circuit with suitable fine wire or better still, some original Mordaunt Short wire.
I have kept the magnet, voice coil/mounting frame separately so that the maximum options are available i.e just using the frame with a different tweeter for example.
Now that the photographs are finished, measurements taken etc, I have now placed all components onto a "foam bed" to protect the domes in particular. These are then sitting on a stiff cardboard base and sealed completely in bubblewrap, ready for shipping.
