What Is Frequency Response? || Understanding the Measurements Part 1

In this video - the first of many to come - I provide a brief summary of what frequency response in loudspeakers means.

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All of my tests are conducted using KLIPPEL Hardware and Software. KLIPPEL is an innovative leader in providing unique test equipment for electro-acoustical transducers and audio systems. Founded in 1997 by Dr. Wolfgang Klippel, the novel techniques developed for control and measurement systems of loudspeakers and other transducers are the result of over 30 years of fundamental research. This provides more accurate physical models of loudspeakers, micro-speakers and headphones valid for both small and large amplitudes. The focus is on revealing the root causes of signal distortion and defects and giving practical indications for improvements in design and manufacturing of audio products. For information on KLIPPEL products, please visit their site below:

[pieterboning]

Very straight and no jargon! Thank you!

[GuruPrasanna]

This is amazing and something I sorely needed. Thank you.

[jeremiahchamberlin]

This is my second time through your series. I can’t believe there aren’t 3.3k comments because an understanding of measurement fundamentals is so important. Of course, it helps if you can reference a work like Toole’s book and grasp concepts like psychoacoustics. 🙂

[shadowtzhar]

Thanks Erin, you made it simple and plain to layman like me

[Psyphonyx_Life]

Perfect! - We do need this data coming out. Everyone will benefit from your efforts =)

[JohnSmith-qico]

Absolutely excellent Erin! HOWEVER...please include how much smooting is used in graphs. Thanks plenty!

[gerritgovaerts]

Great series of videos, very much needed info for many audiophiles . I dissagree however that on-axis performance is the most important . It's actually in the off-axis dispersion that good speakers are separated from badly sounding speakers . It's not that difficult to design for a flat on-axis performance but Constant Directivity is way more difficult and very (the most) important !

[.crackthecase]

I found you by searching how to test sound frequency. I firmly believe in what influence sound has on everything. Just an idea there are many channels here on YouTube that I was led to believe were of real listening value to enhance quality of needs: bone healing: Heart healing: energy clearing: attract abundance while you sleep: clear congestion head: clear migraines. We have been saturated with amature producers of these videos and 1) need a way to test authentic vibration. 2)ask you tube to monitor this a little more. I have health care education and also had bones to heal and grow quicker by this technique devuces put out by Medtronic specifically bone stimulator. Maybe you could put out mor video content regarding this subject. Thank you.

[we]

Thank you for all the information and education for those of us who are not engineers! I agree all theses subjective reviews are not very useful! To me, music is just like food we all have different tastes! Now we can all agree that a Stradivarius sound much better than a cheap violon 🎻

[neiloppa]

You read my mind. I was wondering how to read the data and compare them.

[adamjj]

Nice video and great points Erin. I'm getting a little tired of the subjective only reviews out there. Without measurements, they are just pure entertainment.

[TylerStout]

Happy to see this series :) Not seeing the cta link in the description though

[rlowes]

Great video series idea Erin. As you say, hopefully it should help keep your videos a bit shorter by asking people to refer to these videos if they want to understand the data you’re providing in the review, rather than having to educate in as much detail in each video.

[ajc-thei]

Great video. I would enjoy one about distortion, especially with how to read distortion charts and the influence of the different harmonic distortions on different areas of the spectrum.

[astra]

Thank you again. Linearity in frequency response is transparency. No one would buy glasses with inclusions or tainted glass or uneven thickness for the purpose of reading books or magazines. And no bibliophile would recommend to do so.
No museum would expose paintings under tainted lights.

[noahnovotny]

Hey, Erin I really enjoy your videos! I know you focus on speakers and driver measurements mainly. I'd like to hear your opinions on amps. Do you think amps make much of a difference? Amir does a lot of amp measuring, but he doesn't really say much about how they sound. I've never really heard your opinion on the difference between amps. I know this might be more subjective than you usually get, but I hear so many people saying "this amp sounds better than this amp". Do audiophile amps have something special over something like a quality QSC or crown amp? Something that would actually make the speakers perform better I mean. I make DIY speakers and put tons of thought and effort into the performance but I don't have the skillset to make DIY amps. Would I really be getting better performance if I were to get something more high-end assuming I am not running out of power?

[Mikexception]

In fact measurement of frequency response in a way it is popularly understood is not available. Hard to explain in two words but it is mostly about timing during collecting measured data.

Measurement frequency response in anechoid chamber suffer from, basic resonance in relatively big chamber. So if such speaker "is flat" in chamber that particular frequency in smaller room may be downed and that is why it is so popularly advised to use sub-woofer., We will be better with speaker which has lowest frequency as own resonance or cooperating with resonance of listener's room than with one which has got results in not matching room resonance of chamber .

 Mostly due to heavy damping in chamber results in real room will emphasize the reflections of ranges which without treatment are hard to damp in such room . Such room damps well only reflections of sopranos That is why most speakers have too soft sounding in home and one of reasons for unnecessary hunt for higher sopranos That is why in my opinion measurements in chamber are false because conditions are although standard anyway artificial

[kevincheong]

Thanks for your effort. Good stuff. There's only one point if you may allow me to clarify. You mentioned in-room vs anechoic response being different; while it is true, frequency above the transition frequency, say 250hz, chances are my in room response and yours wouldn't deviate that much.

[nickfountain]

Curious about the X-Y frequency response graph. I think I understood what you were saying about your SPL (essentially volume?) on the left hand column can change depending on if you speak softer or speak louder. Does that also affect the Y axis (Frequency/HZ) response of the speaker. Or will that frequency/Hz response remain the same for the given speaker at different volume levels?

[patrikbjorling]

So what does a equalizer kills regarding to other sonic parameters?