Do not base your answers of nothing, as said by Jason several times with good reason. I am seeing three different possible answers, and it is possible that none of them are right. Look at the product brochures from the ARS site, and you may be closer to an answer.
Pyramid head walks into a bar... there are no survivors.
FS T-Bolt wrote:How did the Thunderbolt outlive the 2T22?
I presume merely because the Thunderbolt was louder.
But the simplicity and less required maintenance of the 2t22 certainly is a plus.
Would be nice to see a time-line of all the sirens.
Now James, you say that the 2T22 was a dual-tone siren only and that the Thunderbolt could be single-tone, which to me means that CD and EMA prefer single-tone sirens. Why? What's wrong with dual-tone sirens?