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In the Forum: Audio Discussions
In the Thread: The loudspeakers for a powerful SET
Post Subject: Stretching itPosted by Gregm on: 4/25/2008
Paul -- I used 1st order & bandpass on the Beyma. I think that 2nd on the Lowther would have been better.
I set out to try and extend one "way" from the end of a wide-range drive unit, downwards. This I found to be well nigh impossible -- perhaps I should say, improbable. While I managed to get a commercially correct sound (i.e. I could measure all the frequencies were there) with 3-way, it just didn't sound right.There were sounds but no music* -- and a sort of "lumpiness" transiting b/ween one to the other.
*When I figure how to put this into words rather than mumbo-jumbo, I'll be sure to explain coherently.
Anyway, the best way of getting away with a 3-way spkr was using the dsp's 48dB/octave (hi & low pass) with delay. This of course, defeats the purpose of our experiment and required 3 amps (one for each "way") anyway. Unfortunately, I didn't have the components to try higher order passive filters.
The conclusion basically is, when the 15" was properly relegated to bass duties & the Lowther to pipsqueak duties, there was a midbass unit missing between the two. I.e., I couldn't integrate the two correctly, you could hear the transition from time to time UNLESS the 15" was cut off. Rerurn to Romy the Cat's Site