BMS 4591 for PA systems?

the 4590 is a great driver, I use this in many a cab / project.

which Paudio horns ecactly? the 2" 60x40 and 90x40 square horns do not load much lower than 800ish imo+measured.. rcf hf950 or 18s xt1464 would be good to 600ish but 1.4" driver required.
limmerhorns have a great horn too that works well with bms coaxials.

re amps, a venue here has 4x 4590s running off an sae pqm8.. no issues at all since 2.5years other than the drivers sounding quite rough at high spl but thats quite normal with those bms coaxials, at some point they start to get harsh/have some serious distortion.

re horns suitable for low loading, i have recently heard a simple conical horn with a bms coax running down to 400ish hz - tbh. it sounded quite nice at lower levels + very efficient and even dispersion.

I think the major factor is not the driver but as bass en mass said the horn in question. The horns I use I have custom made, so were designed for the frequency band I needed the 4590 to play down too.

If you really need 600hz -6db the horn must be big enough, maybe something like this http://www.parts-express.com/jbl-2382a-2-flat-front-bi-radial-horn-120x40-4-bolt--294-425

And here's our waveguide.

After filtering and eq it plays 600Hz -3db, but it's huge, about whd 20x40x30cm and tuned at 350Hz. The lower you tune the horn, the better phase characteristic you'll have at crossover point and the lower pressure level at high frequencies above 10kHz. It's better to use horns from one octave higher the tuning frequencie. Something like this.

PavelP wrote: If you really need 600hz -6db the horn must be big enough, maybe something like this http://www.parts-express.com/jbl-2382a-2-flat-front-bi-radial-horn-120x40-4-bolt--294-425 And here's our waveguide. After filtering and eq it plays 600Hz -3db, but it's huge, about whd 20x40x30cm and tuned at 350Hz. The lower you tune the horn, the better phase characteristic you'll have at crossover point and the lower pressure level at high frequencies above 10kHz. It's better to use horns from one octave higher the tuning frequencie. Something like this.