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Hi-Vi T20 ($5) - The cheapest tweeter in this test is worth the money with some limitations. The top octave response is rough but good enough. A smooth low end makes for an easy crossover but harmonic distortion limits useful low end range to 4 kHz. Off axis response curves available. Tested April 2008.
Hi-Vi TN25 ($8) - This is a neo magnet tweeter with a rear chamber. Flow restriction between the chambers causes two impedance peaks and a dip at 500 Hz. Harmonic distortion is generally too high across the board, and there are cleaner options in the price range. Tested April 2008.
Hi-Vi X1R ($9) - Worst performing tweeter in this group. I have to wonder if they were somehow defective, but my two samples measured the same... then went in the garbage. A dome material that's too light and flexible plus ferrofluid that's too thick = no impedance peak and horrible distortion. Tested February 2007.
Hi-Vi K1 ($9) - Smooth response. Shielded magnet, rather large 116mm flange. Low Fs for a tweeter with no rear chamber and a solid pole piece. High F5 below 2.2khz. Average to slightly high IMD. (not shown) Cross LR4 @ 2.2kHz or LR2 @ 3kHz for best results. Decent performer in a garbage price range. Tested September 2005
Hi-Vi TN28 ($13) - Bonus points for a neat looking top mount design. Minus points for energy storage at 8kHz. Tested in a typical configuration on top of an enclosure. High F5 at 1.6kHz will melt your ears if crossed over too low. Poor performer overall
Hi-Vi SD1.1 ($13) - "A" version tested. Nice performance for a tweeter of this price, and probably worth the few bucks more than the K1, but there are some consistency issues. Twin impedance peaks cause a slightly bumpy low end that smoothes out in box with typical baffle diffraction peaking. Slight rise in the top octave goes to flat a few degrees off axis. Make sure you have the shiny dome shown on the right. The dull one on the left measures horribly. Old/Other tests available. Tested February 2007.
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