![]() There's also several break-up nodes ranging from 9,5kHz and up. Notice the frequency dip in the 60-90deg plots at 4,5kHz, this is due to beaming (speed of sound in inch/speaker diameter), 13503/3=4501Hz). Measuring is knowing and now I'm pretty certain of the limits of these drivers.įrequency Response, 0-15-30-45-60-75-90deg (Baffle effect showing up below 2kHz). Since I started to use the more powerful measurement program ARTA for loudspeaker measurements I ran the ETON 3-400 through the same measurements as the Vifa tweeters to find the optimal range of usage. I posted a few thoughts about audibility of non-linearities but the thread didn't caught much interest This correlates with the 2nd order -> 3rd order HD ratio somewhat Logically IMD should be worse than HD since the distortion ain't related to any harmonics and taller IMD products are more widely spread.Īs you can see, the tone at 1kHz creating massive amounts of 2nd order IMD that's even higher than the 2nd harmonic! Check 4,5kHz and 5,5kHz which is the 2nd order IMD. Both are non-linearities but the general consensus is that IMD is more audible than HD (even if there's studies pointing out that non-linear distortion ain't very audible at all.). Wherever 2nd HD is high, 2nd IMD is high - if 3rd HD is high, 3rd IMD is high etc etc. IMD is harder to measure but it's basically strongly connected to harmonic distortion. Here's one IM test playing sine tones at 1kHz and 4,5kHz. IMD (Intermodulation Distortion) - Two Tone, 90dB/1m equivalent Below 2kHz the HD gets very audible, DON'T use this tweeter that low. The distortion levels above 4kHz at this output is among the better drivers I've tested and rivals my Scan 6600 in this range. Basically no tall order HD to be worried about, even H3 is below 0,05% from 4kHz and up. The driver have high amounts of 2nd order HD in relation to 3rd order HD, which is good. Above 3.5kHz the data is equivalent to 92dB/1m. Without it, distortion would be approximately 2-3% higher overall below 2kHz. I was afraid the driver would be damaged by feeding it fullrange close to Fs. There was a 15uF cap in series with driver during the measurement. %HD vs Amplitude (92dB/1m equivalent), taken "semi-nearfield" Stepped Sine Tones 1/48oct - Harmonic Distortion Ringing below 3kHz but looks pretty clean above 4-5kHz. Just differently.įrequency Response 0-15-30-45-60-90 degrees (Smoothed 1/48oct) The polar response and the sonogram below displays the same data as the FR-plot. Above 5kHz the driver act more and more directional, which is great, SPL is down a fair bit once the dispersed sound reaches the dash/windshield. The discrepancies above 10kHz are likely due to radiation from the phase plug. Forgot to generate a mean sound power response curve, but as you can see from the FR-plot below, each curve almost track perfectly vs angle until 10kHz. Each impedance peak have been averaged 5 times for better accuracy. ![]() All measurements are done psuedo-anechoic (gated), i.e no reflections in any measurements. I did some additional measurements on my tweeters (with the small waveguides).
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