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Additional resources: using speaker design software for woofer substitution

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When substituting woofers in loudspeakers, you'll need to find one that mechanically fits.  In addition, you'll want to consider the bass performance. Woofers have three parameters that affect bass performance. They’re collectively known as the Thiele/Small (T/S) parameters and are named fs, Qts, and Vas. Even if we knew what the original woofer T/S parameters were, it’s not important to match them. What’s important is that the replacement woofer is compatible with the speaker box.  Sealed boxes (i.e., no vent or port) are forgiving of a wide range of T/S parameters. The best simple advice for them is to avoid choosing a replacement woofer that has a Qts value larger than 0.7. Woofers with high Qts values have weak magnet structures and run the risk of producing boomy, resonant bass. Ported speaker boxes are more complex in design and are much more sensitive to T/S parameter changes than sealed boxes. If you want to do a good job substituting a woofer in a ported box, you’ll
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Additional resources: Tools, supplies, and test equipment

 Here are product links to make shopping easier for many of the tools, supplies, and test equipment described in the Electronics Repair Cookbook. Electronics Repair Cookbook CAIG DeoxIT D5 Figure 4-1 CAIG DeoxIT Fader F5 Figure 4-2 Techspray Duster Figure 4-3 Techspray Freezer Figure 4-4 Techspray isopropyl alcohol Figure 4-10 Loctite Quickset Epoxy Figure 4-11 Loctite Epoxy Repair Putty Figure 4-12 Loctite Plastics Bonding System Figure 4-13 Klein needle-nose pliers D307-51/2C Figure 4-17 Klein diagonal cutters D202-6C Figure 4-18 Klein flush cutters D275-5 Figure 4-19 Klein wire stripper 11046 Figure 4-20 X-Acto Gripster knife with #11 blade Figure 4-21 Wiha precision slotted/Phillips screwdriver set 26197 Figure 4-22 JIS screwdriver set Moody 58-0405 Figure 4-23 Klein 32 piece tamperproof bit set 32525 Figure 4-26
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Additional resources: How to use an oscilloscope

 As educator and Tech Explorations founder Peter Dalmaris says, "the oscilloscope is an amazing instrument that can help you gain a deeper understanding of electronics and how devices work. Beyond learning, an oscilloscope is a very useful tool when you work to verify, maintain, and troubleshoot electronic devices. In addition to the multimeter, it gives you the ability to literally probe a circuit and see it working (or not working). Over time, as you become more proficient in using it, the oscilloscope will allow you to know exactly what is going on in a circuit instead of only guessing." The Tech Explorations website provides an excellent set of tutorials on the subject, available at their website here:  https://techexplorations.com/oscilloscope/
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