for most purposes, no helper tweeter needed - vocals in general are very good - cone excursion around 1/16" peak to peak for decent listening levels. On sustained organ pedal tones with a Rudy Rosa cd there's some "gargle" - possibly motor related as cone excursion is very low. - BG20 is nice driver for the money and for a K12. click the two pictures to get the aspect correct
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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Just saw this thread. So in your opinion, the BG20 has sufficient highs not to require a helper tweeter? I was thinking of trying this driver in a low cost MLTL but was wondering about the highs. Where do you have plans for the above enclosure posted?
not much response on this thread - BG20 is a good affordable musical driver and will work in a Karlson 12 - it could work in a smaller K- coupler if the bass were augmented. There's enough highs to be satisfied without use of a helper tweeter - the cabinet above is one of those "7-slit vent" K12s associated with Pioneer speakers and pretty much like the 1958 K12 save for a 30 degree baffle angle and no upper piece above the 10 degree cant port board. BG20 overall is probably better overall for this purpose than the over-rated BOFU whose surround rotted. It could be interesting to develop a new K-coupler for BG20 - or just use a different vent with the existing K12 form factor.
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