to more directly answer your question rather than ask questions, here are some basics.
Assuming that you piezo's are old, hopefully they are motorolas...
Most common, a circular load in square mount about a 3.5 inch, these have a natural rolloff of about 3500.Sensitivity around 92. Even though we made them sound better, we never got great results from them...
Round 3" mount expedential horn, Natural rolloff about 3200 hz. sensitivity around 91. With the right mods, these became fairly good fast like a ribbon, would get edgy without a lot of work.
2x5 never liked em, so didn't experiment
2x6... overall, we got the best results from these... took them apart, put a coat of latex damping on the cone, removed the resistor, filled the internal cavity. Put them back together, wrapped them in butyl tape, added appropriate resistor and they were surprisingly good. These had a natural rolloff of about 1800hz. Sensitivity around 94.
An amplifier see's these as a capacitive load, do not hook these up and test them alone, use a resistor if possible. You could pop an output if you aren't careful.
I hope this helps,
Tim
Assuming that you piezo's are old, hopefully they are motorolas...
Most common, a circular load in square mount about a 3.5 inch, these have a natural rolloff of about 3500.Sensitivity around 92. Even though we made them sound better, we never got great results from them...
Round 3" mount expedential horn, Natural rolloff about 3200 hz. sensitivity around 91. With the right mods, these became fairly good fast like a ribbon, would get edgy without a lot of work.
2x5 never liked em, so didn't experiment
2x6... overall, we got the best results from these... took them apart, put a coat of latex damping on the cone, removed the resistor, filled the internal cavity. Put them back together, wrapped them in butyl tape, added appropriate resistor and they were surprisingly good. These had a natural rolloff of about 1800hz. Sensitivity around 94.
An amplifier see's these as a capacitive load, do not hook these up and test them alone, use a resistor if possible. You could pop an output if you aren't careful.
I hope this helps,
Tim