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Romy wrote :

"...What I expected the S3 does very well – it runs at 600Hz with first order with no “issue” in the bottom region (250Hz Tratrix horn). The next step will be lowering the crossover point to 500-550Hz (that are ultimate objectives)... What however very much surprised me is the dynamic confidence with witch S3 cares the duty at 600Hz - very imprecise. The S2 was if not dying but really at the very last octave of it’s potency. If I run the Fundamental with S2 at 0dB in relation to MF then I felt it. Since I run the Fundamentals at minus ~ 9dB then the S2 was doing fine. The S3 does have more dynamic balls and it looks like at 600Hz it is still very much not “there”. It would be interning to drop crossover point with S3 at try it in 180Hz-210Hz horn...."

There should be no danger in running the S3s down to 500Hz; I am currently running a pair of S2s (same diaphragm as S3) down to 450Hz, 1st order, no problem.

The system is in a room that measures around 80m² with a 3m-high ceiling; in this size room, playing the system loud deos not distress the driver when filtered as described, and there is no evidence of honk at the lower end (the fundamentals channel in my case consists of an S2 into a 180 Hz horn). I should add that this channel is connected to the 8 Ohm taps, while all other channels are all connected to the 16 Ohm taps; the fundamentals channel is hence somewhat attenuated, but not a lot (the 180Hz horn is naturally louder).

Evolution of my own fundamentals channel :

I will now confess, after living with it both ways, to having gone some of the way back toward "misusing" my fundamentals channel.

http://www.goodsoundclub.com/GetPost.aspx?PostID=7760
That is to say, I am for the moment, allowing it to produce a full two octaves, as do all other channels of this system. The pair of drivers is now electronically filtered to work between 450 and 2000 Hz, 1st order (a 18µF cap followed by a 1.5mH coil).

jd*

Rerurn to Romy the Cat's Site