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jessie.dazzle wrote:

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).

OK, if it so then my 550-600Hz limitation is not the limitation of S2 driver but my 250Hz horn. This BTW expanse what we have such a differences in assessment of leaking he the S2’s back chamber. (It was somewhere in past). In my case it let it the driver to go 50Hz harder (with some other issues arriving), in your case it was not good as you have a larger hors and there was so “room” for the driver to go down naturally. As I told before: the decision to go for 180Hz was very good on your part and now you are benefited. What is interning is that even in context of my 250Hz horn I do pick some benefits of S3: like higher dynamics at lower region. What would be VERY interning is to run S2 and S3 in 150Hz horn and to see if it possible to load them down to 350-400Hz. I have seen as S2 go apart at 450Hz in open air as the diaphragm-pressing plate is not good in S2. With S2 the diaphragm-pressing plate looks much better and it decoupled from the back of the driver – so I think the S3 will go lover, with no mechanical stress.

jessie.dazzle wrote:

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).

Well, it is very legitimate was to do the things. I see a few moments with increase of the low-path up to 2kHz I will outline below.

1)    The Fundamentals Channel at 2kHz with first order pass too much directional HF. Since the 180Hz  is relatively large (twice larger then 250Hz for instance) then the Fundamentals Channel axis will be higher and consequentially the mid lime of the system will be risen at 2kHz much more then at 1kHz. I personally would recommend of lower upper knee crossover point if you drop the lower knee crossover point, but it is only in the case if the minimum integration distance is important. With 80m² room I doubt that it is critical for you.

2)    If the upper knee of your Fundamentals Channel is at 2kHz hen you might not use 450Hz for MF Channel but go for 700-800Hz. This would add some HF extension to your MF channel and will make them MF less beamy.

3)    The biggest this that I see is the flatness of Vitavox drivers over the 1250Hz. Running the driver flat you will have let say  109dB at 500hz and 2kHz but you will have 113dB at 1250Hz. How do you deal with it? Using impedance compensators? Any other means?

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