Hi Anti K,
May BMS 4540ND would be OK
http://www.bmsspeakers.com/index.php?id=bms_4540nd
or Ferrous 4538
https://www.thomann.de/gb/bms_45388_ohm.htm
and Slenium Horn HM-17-25
https://www.parts-express.com/Seleni...aign=100035528
Features:
- Horn Type: Bi-radial
- Minimum Frequency: 1,500 Hz
- Nominal Dispersion: 60o H x 40o V
- Throat Diameter: 1.0″
- Mounting Type: 1-3/8″-18 TPI
- Dimensions: 6.34″ W x 5.16″ H x 4.16″ D
Regards
Ivica