4/19/2024 0 Comments Hands on sound diffraction![]() ![]() Say you have a 150mm narrow baffle and you design your BSC to give a flat on axis response in a free standing measurement. Even half a dB tilt out in this overall balance across the midrange will not sound right.Īchieving this with a narrow baffle speaker in real world rooms is nearly impossible because the speaker is affected so much by the wall behind it at the lower midrange end. The balance between low midrange around 300Hz and upper midrange around 3000Hz is extremely critical to get vocals and imaging right. The speaker placement in relation to the wall behind it will dramatically affect the frequency response balance of the midrange across the 300-3000Hz range. How is a slim baffled speaker significantly more susceptible to room effects than a wide baffle?Ĭlick to expand.Because the lower and middle midrange will be near omnidirectional on a 150mm wide baffle. Only way of doing that is using larger drivers or adding a horn/waveguide to the tweeter to narrow its radiation pattern. The overall frequency response, ignoring slight ripple, at say 45degrees is going to be near identical for both baffle widths so you aren't going to notice any significant reduction in room effects, which probably need to be reduced somewhere on the order of 10dB to give a noticeable improvement. With a 600mm wide baffle perhaps with careful placement of the tweeter you can achieve +/-1dB through all listening angles where as with a 150mm baffle you may have to deal with +/-2dB. Increasing the width of the baffle only modestly decreases the amount of ripple in the response of the tweeter. ![]() The frontal radiation pattern depends almost entirely on the geometry of the tweeter itself. All baffles >150mm radiate 2pi for tweeters. The BSC frequency for a 150mm wide baffle is already about 600Hz, so almost no difference in the amount of tweeter frequencies radiated to the sides/rear of the enclosure occurs for baffles >150mm. Click to expand.How is a slim baffled speaker significantly more susceptible to room effects than a wide baffle? ![]()
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