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Ronnie wrote:

Listening to the horns, it seems that they indeed die somewhere below 120Hz. I was surprised, and a little disappointed that it seemed so steep. Good to hear that it's to be expected!!Yes, I'm using a 30-something-Hz 1st order high pass on them too.

Yes, what happens with horns is very similar to what depends with boats. When you do boats you always experience the “2 feet deficiency” as you fell that if you have a boat 2 feet longer then you would be able to feet everything…. Of course the longer boat does not help, as it will have also the “2 feet deficiency”. The very same happens with horns, as we always feel that it is were a few inches larger and a few Hz lower then it would be more fun…. It is the miserable human nature. We Cats are so much better! We juts hate everything regardless what it is….

Ronnie wrote:

The LF crossover point has been tuned by ear to 60Hz (1st order), and I was beginning to think that perhaps that should result in a dip around 100Hz. I guess I'll have to sit down and learn the crossover maths ;-)

Hm…. Forget about the math. You need a RTA and a good calibrated microphone in the listening position.

Ronnie wrote:

A propos that, My big-mouth-fostex-horns should be high-passed at the same frequency as the big horns are low-passed, right? I'm using 1st order 950Hz HP and LP.

Yes , most likely so.

Ronnie wrote:

There are just so many variables: LF-box positions, LF-volume (on the amp), XO point (pots in the line-level XO). The slightest change can screw everything up. especially turning the volume knob on the big-horn-controller-amp a fraction of a millimeter can be devastating or perfect. I've got those knobs glued in approximately the right place. :-)

Actually if you milliamp then you should get rig off all those knobs and use fixed voltage dividers at line level (and perhaps the  filters in there as well)

Ronnie wrote:

Anyway. The LF is wavy and that's why I've resorted to listening to beautiful sinesweeps tonight, trying to find the most even LF, and go on from there.

You will find a good setting, Ronnie, it might take for a while. Do not forget that your room might be no LF symmetrical and it is fine to use different dB and different cut offs for different channel. In-phase the LF and upperbass and sink any deeps with moving the LF cat off on right.  BTW, be advised that linearity of separate channels not always does the linearity of stereo mix…. BYW, if I were you and if the real-estate would allow, then I would place the speakers twice wider. Move them as wide unit the mid image become “thin”. Also try to move the bass arrays further from the horns but at the same distance from the geometrical “sweet spot”.

The Cat

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