Understanding Power Amplifier Measurements

Tutorial on how to read and interpret power amplifier measurements. Examples measurements are shown for Topping LA90 Discrete, Fosi Audio BT20A Pro, and Luxman SQ-N150.

[AudioScienceReview]

Sorry about the audio quality. My external microphone got disconnected and video got recorded using internal camera mic. Hopefully you can still understand my voice.

[PiOhMy]

I learn more in an hour watch your vids than decades looking elsewhere. Thanks.

[gamerpaddy]

Amir & ASR is the "Project Farm" of HIFI, no bs, no marketing wank, only test results matter. thanks !

[zefrog]

Certainly makes you weary of all the YouTube reviewers that have raved about the Luxman for example.😂 Really is an industry full of crap and the majority of reviewers are actually just influencers.😂
Great work as usual, refreshing to see someone using actual science combined with honesty, no wonder a lot of those peddling high end gear really get annoyed by you. Nice to have somebody genuinely for the consumer.

[epi]

I love this channel and it keeps me in check with my addiction. I was at Apoxna ‘23 two weeks ago and drooled over many car & home priced gear.

[Projacked]

Have to say this again;
The whole point of listening to an expert, backed up by the science= > you lose all the myths very fast.
And that is all humanity needs imho.
Amir, you rock man.

[HeyYall]

This lecture made my day. I thoroughly enjoyed it! Second time hearing it!

[jeankazamer]

Also, Amir, usually tubes of 10 minutes are cut in like 20 segments. you are rolling straight through 1 hour plus long 😂😂 When someone is passionate and has mastered his passion this is what we get!! incredible sharing :) ❤❤

[TheLkdude]

Wow, the holy grail of amplifier measurements !!!, Many thanks for sharing this knowledge and for the fantastic presentation !

[annenominous]

Brilliant tutorial, must watch for folks that wish to learn the truth about amplifier performance. Not the full story, but certainly the easy to understand part of the story. Thank you!!

[eattoast]

this man is puttin out content. I love to see it.

[JesusMartinez-mkfc]

Now a masterclass on amplifier measurements Aimr. Excellent! You're killing it with this "understanding measurements" series of videos Amir. Great idea to present three different levels of performance and what sets them apart, a SOTA design, a competent performer and an example of what to stay away from. Furthermore, it demonstrates very well how higher cost gear doesn't always correlate with higher performance in this shameless marketplace. You killed three birds with one stone Amir; OK the last one was already dead. 😂

[motjones]

Nice job Amir. Very good idea to point out the top, middle and bottom of the specification spectrum. I thoroughly enjoyed your explanations and very good pace packed full of information. Thank You Sir.

[Untilitpases]

You've done it again! Thank your for providing so much x-ray vision to a "compromised" community (paradoxically claiming to chase high fidelity while lacking integrity/fidelity and debasing the discussion level 😁)
As a zen saying goes, a talk with a knowledgeable person is worth many a book. Even your passing comments are insightful. (Like when an amp might sound bright, likely separation to soundstage correlation etc.)

Thank you Amir, you already knows this but it bares repeating: you *are* making the world a better place in your way, and making lots of manufacturers angry 😂 in the process.

May you be blessed!

[jcrollman]

This is phenomenal- thank you Amir! With the hot marketplace today for vintage 1970's amplifiers, I'd be curious to do a comparison between an aged vintage amp and the same amp today with replaced capacitors and compare and analyze the difference.

[KevinLaffey]

Another brilliant, informative video. Thanks Amir.

[leekumiega]

Amir I am grateful you are testing and confirming or debunking manufacturers claims. One issue though when you tested vintage and newer Carver amplifiers you just showed that it measured poorly but did not listen to them to see if your above average listening skills could detect slight distortions . In order to keep relative costs down and provide the most power for the money with the ability to drive difficult speakers Bob feels that as long as you can not hear the THD+N then why spend the money to improve a measurement. I have a 1981 Kenwood monster receiver the Super Eleven that has fantastic specs for it's day but my Carver MXR 130 receiver brings out a lot more micro detail that I did not hear before. Same goes for my Sunfire AV receiver that I use mostly in stereo mode for music, friends that have much more expensive systems never said they could hear that it has a low THD+N rating when asked for an honest opinion. In the future please listen to equipment that measures poorly to see if the deficiencies are audible.

[masterxyr]

Brilliant walk-through all these graphs and steps, and even though I've been on the block for a bit, it's still helpful and elucidating to have such an exposition on the subject.
thanks a bunch

[masterxyr]

wow
the luxman sq-n150 is such a gorgeous piece of hifi gear and its finishing is sweet, and yet it measures 🤮
And just like you said, if there is so much objective noise and distortion, _nobody_ is listening to most of the detail, let alone *more* detail.
Thanks for such great work, Amir!
I enjoyed this long feature :D

[jeankazamer]

I cant keep up !!! crazy! masterclass ongoing 😂 ❤❤❤❤❤❤