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In the Forum: Horn-Loaded Speakers
In the Thread: The most promising “best” commercial speaker
Post Subject: TD4001Posted by Merlin on: 7/21/2007
Keith could you clarify? The TD 4001 has 1st order acoustic slope below 1khz when mounted on most horns. So adding a 1st order electrical slope to that surely does not make a textbook 1st order crossover.
If the 1601a is being run first order above 600hz, that might well explain a lot of what I heard. There is a very good reason why most use steep slopes with the 1600's when run up into the mids. Indeed they are really best crossed over at 300hz or below in my experience - which no doubt they are in the larger models. IIRC it also has a rising response above 200hz.
Using an electrical first order slope for the 4001/703 transition is is just about feasible in my experience, but again leads to resonant peaks from beryllium diaghram break up modes becoming audible. One of the reasons I would add a TD2002 or similar in order to cover the bulk of the treble - as I believe they do in the larger horns themselves . The natural roll off of the 4001 above 5khz would usually preclude it's LP from being a true first order arrangement just like the HP so I am again baffled!
This news possibly partly explains my personal reaction at Munich. A single inductor in the 1601 will certainly give a very different type of bass/lower midrange than I would expect to hear based on my own experiences. Maybe it just needs a little time to readjust.
I am all in favour of 1st order slopes. It's just that they require VERY careful selection of drive units in order to avoid excessive compromises and I don't believe using the TAD catelogue provides for this.Rerurn to Romy the Cat's Site