bcollins wrote:Taking some foam which is intended for air conditioner filters and adhere it to the rear side of the Wizzer cone covering most of the Whizzer
And as David P suggested, removing the dust cover and replacing it with a phase plug
All of these measures - supposedly - are to reduce the "shouty" sound.
EDIT:
One more thing: I have read, "It is imperative that full-range paper drivers be broken in for a considerable length of time prior to any critical listening. A minimum time period of 50 hours should give the cone and suspension an adequate work out."
these recordings were done with the Eminence drivers practically right out of the box. On the other hand, the Conn CTS full-range drivers have been in service since 1964!
Hi!
Yes - you're on the right lines. Until I blew it up with a rogue signal I used a Lowther PM2C for my Tuba stop. The slight shouty sound was ideal - but i modified it with a strip of cotton wool around the back of the whizzer cone, and a lump of cotton wool on the "nose" of the phase plug. Really superb.
But I would not worry about high frequency raggedness. In a pipe chamber there are so many interactions between pipes, so much diffraction, that the frequencies are not coming out of a pipe organ in an even manner.
"Running in" of full range units is vital. I have been using a pair of Lowther PM2Cs in Acousta cabinets now for 10 years. I should be using PM6C but like the extra detail of the PM2 - it's wonderful for baroque, brilliant for sax and jazz and altogether gives a hair standing up on the back of the neck realism. But at first they were hard and brittle in sound, especially on a violin, but are now really amazing. An additional joy of these speakers is to be able to reproduce an orchestra, outside, on no more than 30W RMS, 60W peak.
For your 8 and 4ft Diapasons I doubt if anything can compete with a full range unit.
Certainly also, you are right in using different speakers for different stops. I met an old member of the EOCS - Electronic Organ Constructors Society - who said that he had had good experience of using a variety of disparate units - he says that if you use different units it sounds like an organ - if you use the same units, it sounds like an organ through speakers.
Best wishes
David P