Testing a pair of these shows sensitivity seeming to fall short, about 87 dB / 2.8 volts / 1 metre. (the actual sound level measured at 2V is about 84 dB, so extrapolated). Pulling off the deflection pads completely brings the output up another 3ish dB to roughly 90 dB until about 9-10 kHz, where it rises to about 93 dB. I know my numbers are close to correct since a Bliesma T25B on an Augerpro 6.5" waveguide comes in at 98ish dB, as expected.
The Raal spec sheet claims about 4-5 dB more than I measured for the 70-10D, so what am I missing here? Both tweeters show the same numbers and the response curves match well so it shouldn't be a case of a bad unit.
The Raal spec sheet claims about 4-5 dB more than I measured for the 70-10D, so what am I missing here? Both tweeters show the same numbers and the response curves match well so it shouldn't be a case of a bad unit.
Your numbers are probably 1-2 dB off but I won't count that against you. The data sheet says it crosses the 90dB line at about precisely 4kHz. That means they either lied on the 8 Ohm or on the spl. From what I've seen so far from independent measurements, the tweeter got an impedance of a LOT LOWER than 8 Ohm, so count on it, the spl is only reached at a tad above 4 Ohm and it only reaches the proposed spl at ~12-15kHz. Or, in other words, they straight out lied about the spl. These are still good tweeters but you probably should use them in an active speaker with a DSP, otherwise they are only usable as super-tweeters if you use a passive xo.