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In the Forum: Audio Discussions
In the Thread: The loudspeakers for a powerful SET
Post Subject: Networks as power sinks and source-able LFPosted by Paul S on: 4/18/2008
Believe, me, I agree wholeheartedly that running the DX4 down to 150 Hz is sub-optimal. In my case it is a compromise that has more to do with working efficiency vs. aural continuity than SPLs. I have also though of adding a 10" to handle that narrow range, but which 10"? The Lowther is so freaking fast that it tends to leave other drivers for dead, and so crossovers tend to be too obvious/discontinuous.
Mats, I also agree that no driver should be wrung out, and I regard my own 40 Hz/15" as level matching rather than an assult on LF. Although I suppose 70 Hz limit would sound better, that is not low enough for me to enjoy music, and had I gone that way I would probably have bi-amped from the start. One way or the other, that last octave is elusive via FR SET/40 W, and my experience at dividing up the nether regions is limited, at least as far as SET is concerned.
Like we discussed up this thread, another factor is one's ability to aurally pinpoint a woofer operating at higher frequencies, and I suppose this would be especially true if the woofer is quite different from the Lowther. This is not something I've tried yet, but i can say that the 150 Hz was source-able only very rarely. Ironically, it was source-able when everything was otherwise at its considerable best and LF was really cranking. I figured out that the vent was just a tiny bit too big and a piece of weatherstripping actually made the woofer disappear. However, it is that close, in my experience, at 150 Hz.
At this point, using my present compromise as a reference, I just need a little more grunt at LF x-over point, which I think I can get by massaging x-over.
But that extra LF is elusive.
Greg, I look forward to hearing about your WE experiments.
Best regards,
Paul SRerurn to Romy the Cat's Site