Hi
Last election I acquired two bad shaped paging horns, since the owner didn't bother asking them back. You know those round 25 or 30 Cm diameter cones, You put on the car roof.
Since they were deformed / oxidated, I took them apart and repaired / painted them and they work but I found some oxidation inside the drivers. The coils are 16 ohm 35W and were wired in parallel.
I am planning to built an amplifier, since I have two TDA7275 50W amplifier chips around, salvaged from my old Grundig Head unit. It will include a mic preamp bass & treble controls and will mix with an USB / SD card reader module or aux input. A few op-amps.
When I look at specs for drivers, what comes to my attention is the frequency response .. most of them go up to 7500-8000 Hz.
Is there anything I can do in order to step up the response a litle bit ?
Can I use ordinary PA compression drivers with them, since the originals are the same screw on type ? For example a Selenium D220 TI.
The voice coils sizes look identical to me, but the seleniums are made of titan instead of phenol.
I am looking at mixer schematics right now, since I own several ones but if anyone could post a circuit based on a commercial unit that would be great.
Thank You
Last election I acquired two bad shaped paging horns, since the owner didn't bother asking them back. You know those round 25 or 30 Cm diameter cones, You put on the car roof.
Since they were deformed / oxidated, I took them apart and repaired / painted them and they work but I found some oxidation inside the drivers. The coils are 16 ohm 35W and were wired in parallel.
I am planning to built an amplifier, since I have two TDA7275 50W amplifier chips around, salvaged from my old Grundig Head unit. It will include a mic preamp bass & treble controls and will mix with an USB / SD card reader module or aux input. A few op-amps.
When I look at specs for drivers, what comes to my attention is the frequency response .. most of them go up to 7500-8000 Hz.
Is there anything I can do in order to step up the response a litle bit ?
Can I use ordinary PA compression drivers with them, since the originals are the same screw on type ? For example a Selenium D220 TI.
The voice coils sizes look identical to me, but the seleniums are made of titan instead of phenol.
I am looking at mixer schematics right now, since I own several ones but if anyone could post a circuit based on a commercial unit that would be great.
Thank You
Repair them to factory specs and save them for next election, cattle market auction and similar duties.
Don´t try to polish a turd.
Don´t try to polish a turd.
Visaton has a design with a paging horn called 'Fiesta 25'. The horn is used from 700 to 3000 Hz.
FIESTA 25 | Visaton
You could try to use an equalizer to extend the frequency response up to 10 kHz. If your horns are folded, the folds prevent the response from reaching much higher and using different compression drivers will not help.
FIESTA 25 | Visaton
You could try to use an equalizer to extend the frequency response up to 10 kHz. If your horns are folded, the folds prevent the response from reaching much higher and using different compression drivers will not help.
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