Hi-Vi Q1R

Despite its low cost and not at the highest level measured performance, I really liked the Q1R tweeter. The frequency response is smooth. The sound is very soft with a pleasant atmosphere and airiness. The rendering of micro nuances is very good, and the percussion is expressive. The tweeter has low distortion at low end, so it can be crossed really low, I think down to 1700 Hz. By its sound signature Q1R reminded me sounding of the ScanSpeak D2905/9500, D2905/9700, D2905/9900 tweeters. And if it can't reach the last two, then it can really to compete with the 9500.

The production quality is high, except the plastic flange, which nevertheless copes with its duties quite well. Taking in account the tweeter mass - 0.8 kg, I think, Hi-Vi Research company put in its product even more than the price allows. 

Originally, Q1R tweeter is supplied with ferrofluid in the magnet gap. In my opinion, ferrofluid has negative effect on sound quality, so, if it possible, I pull it out always and did it with Q1R tweeters too. So, all the measurement below are for a tweeter with NO FERRO FLUID. For comparing, in the "Impedance" part diagrams for original tweeter with ferrofluid and for tweeter with no ferrofluid are shown. For comparison, the “Impedance” section shows diagrams for the tweeter with and with no ferro fluid.

The THD measurements at voltage levels 2.83 - 11.2 V were carried out with High Pass Filter "on" (2nd order Butterworth type, 800 Hz cutoff, HPF2-800)