![]() ![]() Because the drivers all have a very high Qts, I started to see how low I could go, getting maximum bass performance out of the drivers without losing the overall frequency balance.Īfter hours of simulation with Martin’s MathCad models, I found the best compromise was 55Hz, which is low for drivers with an Fs of 100 or 110Hz. The tuning frequency of the cabinet alone should be set lower than the driver Fs. These problems can be solved by different design parameters, which I have successfully used with the TABAQ design. However, there are some unwanted higher harmonics, which are out of phase with the driver, causing uneven frequency response. At the cabinet resonance, the output adds to the driver output. The whole idea with a quarter wave - or transmission line - is to extend the bass by the contribution from the opening. However, high Qts drivers can be difficult to control. The Tang Band drivers have a relatively high Fs and very high Qts, which means the rolloff is more gentle than a low Qts driver, and it is therefore possible to design a quarter wave with useful output well below Fs. My first test was with W3-926S, which I replaced with W3-315SC. You can use all the 3˝ drivers in this construction. ![]() The problems with baffle step are corrected with a simple filter, which balances the SPL in the listening room. The first time you listen to this speaker, you will be impressed by the quality of the sound and performance of the bass, bearing in mind the size of the driver and the lack of financial problems building it. The sound is open with no unwanted resonances, and the bass is relatively deep and clean. 1 is the Infinite Baffle (IB) response, and the solid line is the summed output from the driver and the opening. King for Dummies” on The TABAQ Sound Pressure Level (SPL) is impressive for such a small driver, with a very smooth and broad frequency response. Working with Martin’s models is quite educational, and I feel confident about quarter wave (transmission line) design. ![]() ![]() King and designed and built a successful TL sub (“The HideAway TL Sub,” 7/06 aX). In the last couple of years, I have worked with the useful simulation models from Martin J. They sure deserve a better construction than those found on the Internet. Inspired by debates on the Internet about quarter wave designs with Tang Band 3˝ full-range drivers, I decided to design my own quarter wave loudspeakers. Photo 1: The TABAQ speaker A transmission line designed and optimized for the Tang Band 3” full- range drivers. ![]()
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