Today was great!  To recap, here's a video on Pag/Nag math: https://youtu.be/w1i-A93CL7A This video recaps the concepts and also covers the math: https://youtu.be/GSZhIN9o_yQ This video talks about noise floor, signal to noise ratio, and headroom: https://youtu.be/s_FVx-vF964 Electrical power required (EPR): https://youtu.be/jQaYxLEchLk And series / parallel speaker wiring and impedance: https://youtu.be/hu8lhzOPyIU Here's human audio perception and SPL weighting curves: https://www.youtube.com/watch?v=PmEFL1uaDL8 In addition to covering DISCAS today, we'll also go over networking. Here's a summery: https://youtu.be/IWECXDgIoi4 And a short on addressing: https://www.youtube.com/shorts/rP1r7wScKVs I hope your PAGNAG homework went well. Come to class with questions, and we'll have another great day finishing off the course.  Thanks!  Jim 

Here are the screenshots for the homework problem that we discussed. https://imgur.com/a/XVGlKas  Remember that you need a 6db margin of feedback stability for an equalized system, and 12db for an unequalized one.  I'll post the videos to review for all of today's content in a separate conversation later. 

Hi, all! Thanks again for a great day. Lots of awesome discussion and sharing of experience.  Here's a video that recaps what we learned about logarithms: https://link.brightcove.com/services/player/bcpid1832000919001?bckey=AQ~~,AAABBhYFABE~,7IhC0foyW9w_SQgYQgVQ3ZBSD0IMFQSD&bctid=2047934719001  This is a video on performing log math with decibels: https://youtu.be/SQl7rR-oU3c  Here's another (older) video on using 20 log equations that came up in class: https://youtu.be/a237aMoWyP4   This is a review of contrast ratios and PISCR: https://youtu.be/sNs1iCikjyw  On Wednesday we'll be talking about SPL and weighting curves: https://youtu.be/PmEFL1uaDL8  Check the equation sheet for the formula on loudspeaker spacing. It ought to look awfully familiar.  Also, if you're curious about transducers like speakers and microphones, this is a fun video: https://youtu.be/CughnGkzqNc  If you haven't finished the DISCAS videos yet, please keep chipping away at them.  Catch you in class on Wednesday! Thanks,  Jim 

Today was great, thanks for all of the conversation!  For tomorrow's session, study up on the following videos: (also posted in the original welcome message)  How Electricity Works: https://youtu.be/mc979OhitAg 3 Phase Electricity and Power Generation: https://youtu.be/qthuFLNSrlg Inductors Explained: https://youtu.be/KSylo01n5FY Inverse Square Law: https://bcove.video/2BBrWH9 Wavelength, Frequency, and Amplitude: https://bcove.video/2VzySM7 Speaker Polar Patterns: https://bcove.video/2YyLwwH SPL and Weighting Curves: https://bcove.video/2WvHCn9 I'd also like you to research an electrical design concept called "the pin 1 problem". We'll discuss it in class, but I'm curious what explanations you might find on your own.  I'm looking forward to tomorrow's chat. See you then! Jim

Thanks for a great first day of class!  In case you need a refresher, here's a quick video on mathematical order of operations (PEMDAS) https://youtu.be/WLQ3q5fjWH8 and how to use the TI-30XS calculator https://youtu.be/6k2Ky9WOjyY  For class on Wednesday, please take a look at these videos on the AV project cycle and project management.  AV Project Cycle: https://youtu.be/k09P9FnENR4  Project Management Terms and Tools: https://bcove.video/31nqqTT  AV Site Survey: https://youtu.be/Mg4ZoBs46Uk  Needs Analysis: https://youtu.be/eN-PLol8YLw  To keep our DISCAS conversation moving, and to chip away at it a little bit each day, here's another clip that gets into the science of visual acuity and optotypes: https://youtu.be/Y_KC-i8vhbM 

Hi, all. Happy Friday! Class begins next week on Tuesday the 6th. I hope you're looking forward the topics we'll cover, and the time we'll spend together.  You should already have several resources available to you through the Xchange platform, and I believe you're also enrolled in an AV Math course on the main AVIXA website. In addition to those resources, I wanted to point you toward some great playlists on the AVIXA youtube channel. We'll refer to several of them throughout the course.  Learn with AVIXA: https://www.youtube.com/playlist?list=PLrDZTnChdo6EyJ26gsqqhIGS9uyUDY_OG  AV Math: https://www.youtube.com/playlist?list=PLrDZTnChdo6ES264DjkjCdHXFe-_k4uqM  Near the beginning, we'll be going through Ohm's law. Please brush up on that topic and bring your questions to class. These two videos are a great place to start: https://youtu.be/ec7nGgVYo7Y?list=PLrDZTnChdo6EyJ26gsqqhIGS9uyUDY_OG and https://youtu.be/6J6ZALYmB_g?list=PLrDZTnChdo6ES264DjkjCdHXFe-_k4uqM  DISCAS is another topic that we'll cover later in the program, and it's a big one that takes some time to process. Chuck made a 2-part video on that standard that I'd highly advise you to watch in preparation. https://youtu.be/owfDHc6fJ00 and https://youtu.be/_RWZqHc60mE Please check out those videos to get the wheels turning and start thinking of questions that we should dive into as a group.  I hope you all have a relaxing weekend, enjoy the holiday if you're in the states, and come back recharged and ready for a great course! I'm looking forward to meeting you all. Take care,  Jim