Does a DIY Audio Crossover make sense? How passive filters work! || EB#41

Websites which were shown during the video:

In this video we will have a closer look at audio crossovers. That means I will demonstrate why they need to "split" the frequencies of your music signal and what components are capable of accomplishing this job. This way we will learn quite a lot about passive filter in order to answer the question whether it makes sense to replace an existing audio crossover or creating a DIY one. Let's get started!

Thanks to JLCPCB for sponsoring this video

Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod

[tuttocrafting]

I've studied passive filter at school, 6 month of studying just that argument.

Great Scott does it a couple of minutes video.

I used to draw lot of Bode charts!

[paulmimicry]

I always watch your electronic video, not because i can understand what your are saying (never understand even a single word) but i watch because im amaze, how you able to think and calculate that much.

[aaronvivian]

A huge part of the discussion missed when dealing with filtering components of capacitors and inductors is the phase change introduced. The phase change is visible on every one of your input/output examples on the oscilloscope. This is a critical consideration. For example, when a dual component (12dB/octave) crossover is used on both the high- and low-pass sections, the output for each will be 90 degrees out of phase totaling to 180 degrees, and the woofer and tweeter will be out of phase and cancel each other out at the crossover frequency. The correction for this situation would be to connect either the woofer or tweeter opposite to how they would normally be connected.

[joelrunyan]

Your "engineer penmanship" style is fricking awesome dude... I used to do calculations similarly in college... but I've lost it since I don't use it anymore

[McMasterProGenius]

FULL BRIDGE RECTIFIER... oh wrong channel :p

[donaldfilbert]

An outstanding - clear; concise; and comprehensive job covering the material !! Thanks Great Scott !!

[FreeCircuitLab]

In India we use rc filters at the input section and the filtered signals are separately amplified by multiple amplifier IC s, and for better low frequency response we use op-amp low pass filter at the input of the channel dedicated for subwoofer.then the stereo amplifier consist of three channels (2.1 system)

[truthseeker]

the crossover can be complex because of 3 things : 1) to flatten the impedance of speaker drivers so they act more like resistors because otherwise your calculations using that formula won't make sense once you change that dummy load resistor with real speaker driver. 2) how steep are your crossover ? Bessel, Butterworth, LR, 1st or 2nd or 3rd order etc. 3) how well behaved the frequency response of your speaker drivers. hope that helps.

[xgamerbih]

A little project/challenge for you, Scott:
since you love bikes, you could create a video converting a motor (2 stroke/4 stroke) from a carburetor fuel delivery system, to an EFI (Electronic Fuel Injection) one, since it's 2019! Surely not a challenge for somebody like you. Also, it can be done with any microcontroller, Arduino too, since it's all about reading data, and doing actions in the given timing.

[goodgoat]

You could improve the old cross over by simply replacing the capacitors which ALWAYS degrade over time. In order to start from scratch a crossover that gets the best performance out of the drivers or even to select a good set of drivers from scratch, you need the FRD and ZMA files or the ability to measure and derive them from the drivers themselves. Once you have the files, a free cross over design program like PCD (passive cross over designer) or WinPCD can be used to maximize the performance of the selected drivers. The enclosure type and size is also critical and there are several on line box programs. Parts Express provides the FRD and ZMA files for all of their Dayton Audio drivers and also offers several other brands of DIY drivers. The PE forum is a good source of information as is that of the DIY Sound group. The programs take care of all of the complex math.

[willwaguespack]

wow this video did a better job explaining filters than my EE proffessor

[architt]

JLC PCB is like your new intro, in every video

[davidmarek]

0:40 WOOW, amazing, Capacitors made by TESLA from czechoslovakia!

[mlkhegamefreak]

Your handwriting, the way you write and draw things is amazing

[julian]

I had to study 3 years of Electronics Engineering just to understand this video! Before i used to watch your videos and didn't understand much, but i watched them anyways!

[sobertillnoon]

-20dB per decade? Taking 10 years to turn down the volume seems kinda inefficient.

[Dudleymiddleton]

Your diagram drawing is very therapeutic! :)

[yasserghozy]

You are a highly educated man please make your explanations easier so that more people can understand

[nosafetyswitch]

I once wanted to put an LM35 inside the output filter inductor of my 3D printer to measure its temp. The high frequency switching induced a shitload of noise on the sensor's wires and would display nonsense. Thats where I remembered those RC filters... Needles to say that a low pass with fc around 500Hz did the job and the measurements were crystal clear afterwards. So dont neglect your filters people even in simple tasks!!!

[wonkysouceaasdsad]

Your channel helped me learning electronics, and I'm doing an economic college. Thanks😁