Thanks , Paul ! I knew much of this , but never heard of a chopper ( other than a Harley-Davidson) .

Sounds like the "chopper" is a PFC (Power Factor Correction) boost topology SMPS before the normal voltage transform stage, it essentially (usually) makes a 400V DC stage from 230V AC (in Europe) supply and that can then be switched at higher frequencies with smaller transformer size for a given power for the wanted output voltage stage.

🤗👍THANKS PAUL…. 🤗AND I USUALLY UNDERSTAND …does this make me one of the chosen few 🤔😁💚💚💚

Very informative, i learned something new. Thank You!

I have both classes, and although my Class D sounds good, it gives me ear fatigue whereas Class A/B does not.

I am still amazed when I compare the size of my M1200’s against new BHK 600’s. Both rated at 1200 watts at 4 ohms.

Hi Poul Thanks for your videos, i guess i have seen them all. I understand why only a small tranformator i needed, but why are the filter caps so small on a Smpt compared with a linear PSU? Dosend the Smpt need a 'powerbank' like a linear PSU?

I've always wondered that myself so this was eye opening!! I

It keeps both the shipping weight and the monetary costs overhead factor down. For the companies manufacturing them. ie. Offshore somewhere in some back lane located in Taiwan.

That massive toroid on the shelf! 🤤

I recently went from a Class D amp to a conventional Class A-B power amp. Upon my first listen to the new conventional amp, I noticed that it had a very clear, unsmeared midrange and lower midrange. I was happy to be back on a conventional amp. Years ago, I built a pair of SWTPC Tiger B power amps... still among the BEST sounding amps that I've ever heard... very warm with a high level of fidelity. Nice video, Paul! Thanks!!

Thanks Paul for your very informative information on Class d amps. I am currently experimenting with a ganfet class d stereo amp. (Peachtree). My speakers are an Electrostatic Kaya by Innersound. I find that the Ganfets are quite impressive but at high listening levels it can not supply the needed current that electrostatics require and begins to poop out. To get the 400w/ch at 8ohms these amps are already bridged. The switching power supply just can’t supply that needed current. The company said the only way I might be able to get more current is to use only 1 channel of the stereo amp and purchase another stereo ganfet and use 1 channel from it. Does that sound to you a reasonable solution? I would like to know could a ganfet amp be modded with a traditional power supply that could supply more current? I know one of the earliest class d amps from John Ulrick of Spectron had large transformer based power supplies. Lastly, have you experimented with ganfets and do you ever plan to manufacture an ganfet amp? Hopefully, you could have some options to purchase with a ganfet amp such as a high current power supply and other options. Thanks if you have time to answer and sorry this is 🙄so long.

Switch mode poser supplies have just destroyed the old standard for judging amplifiers. Namely, the heavier the better. Such is progress.

Thanks!

Paul, would a switching power supply benefit from an AC to DC to AC regeneration power source, like PS Audio’s PowerPlant?

Novato was the original home of Wilson Audio

I most cases replacing a "switch mode supply" with a well designed "linear" supply in a class-D Amp will improve the sound. The "switch mode" supplies are just used to keep the weight and the price point down. It's more about marketing than audio quality. Of course Paul did NOT mention why you NEVER see "chopper-switch-mode" power supplies in Class A/A-B amps.

I bought a Aiyima A07 pro and upgraded the power supply to 48v 5a and the AMP gets warm to the touch. Is this normal?

Sir which is best for professional home audio system? Is it active crossover or passive crossover..?

A second reason that Class D amps have small power supplies: They don't waste half of the power supply's output by turning it into heat. A Class AB amp that makes 100 watts into the load will need a roughly 200 watt power supply. A 100 watt Class D amp may only need a 115-120 watt power supply to do the same thing.

You could just as easily put a switching power supply in a class AB amp and it would be fine.

In audio World super teacher, professor is sir you❤❤❤

Hey Paul are Linn Chakra amplifiers class D?

Do the output devices on Class D amps exhibit crossover distortion? The solid-state, Class A amps I used to build, employed MOSFET's, in TO-3 packages, operated at 90 C, at 2 Amps of bias Current to achieve, Class A operation, by the designer's topology. AudioAmateur/Old Colony would sell the boards for 25 bucks/channel. I built the linear PS to easily deliver 4 Amps of bias Current, for more power. By building my own linear PS, 800KVA toroidal transformers were 90 bucks/channel, HEXFRED diodes, a couple of bucks a piece, large filter capacitance, from a surplus House, CHEAP, double bypassed those for less Inductance, as per J. Peter Moncreiff's instruction, in His Journals. Heat sinks relatively inexpensive too. I wouldn't pay the price, compared to someone else designing, building, marketing, etc for retail. I'm just too cheap, plus the learning experience is enriching. Yet the difference between operating the amps at 0 Amps bias current and 4 Amps bias current was amazing. Eliminating the amp of crossover distortion from the Transistors was ,"Magical", vis a vis sound quality. Today, my kit built, EL 509 based, Single Ended, Valve OTL I use, is 3% efficient, delivering 7 watts at 16 Ohms, 4 watts at 8 Ohms, so I use Lowthers at 15 Ohms and Raals at 16 Ohms, plus Stax ear speakers. I'm addicted.

Peavey IPR2 all the way up baby !.!.!.

nice

Back in the mid "70's as a Kenwood Rep, I was travelling with the Kenwood High Speed Clinic. I would go to HiFi stores and set up a test rig with a signal generator sending a 10Khz squarewave into any amp anyone brought in, crank the amp to stated power out into an 8ohm load and measure slew rate and rise time while reviewing the look of the squarewave out on the scope. The Kenwood was lab perfect with a 10Khz squarewave at full power. Very few others even came close! e.g. Yamaha tended to use quasy-complimentary outputs and even a sinewave looked bad! Sony had just come out with switching power supplies in their amps. After 3 in a row literally went up in smoke, I refused to test anymore switching supply amps. Fortunately they had signed wavers and the units were under warranty. I hope the design has come far enough since then! My concern being claims of a tiny class D amp at maybe 500W @ 4ohms from a wall wort supply?

I have 11 Peavey IPR2 7500 on my rack, Jesus Christ.!.!.! We talking power

I'm sorry but all this technical stuff confuses me. I'm not into Hi Fi for the tech I'm in it for the music. Does Class D sound as good as Class A or AB? Seems some think so and others say it doesn't, and then there is the debate about solid-state verses Valves (tubes). Tubes sound better seems to be the prevailing opinion (that's why SS designers always aspire to sound Tube-like). To me if its hot and inefficient but sounds great then that't the way to go. If it can be efficient and lightweight and sound as good then that would be the way to go. From what I understand Class D is getting closer to AB and AB is getting closer to A but if you want the most pleasurable/natural audio sound (and isn't that the goal of High Fidelity Audio) Class A with Tubes seems to be the gold standard at this point in time.

Modern class d is excellent! I just switched and won't be going back.

Watch out for scammers on this channel! They want you to believe that you have been selected as one of Paul’s winners. Don’t dm them!

More interesting meetings at ps audio, then.

Class D is blasphemy! Every morning I fry my bacon and eggs on my mini fridge sized Class A amp.

Thanks for the explanation,but honestly, I'm more confused now than I was at the outset...lol...with all of the gains we have seen in class D over the last few years, some are saying that class D is the future. Anyone here in the comment section have an opinion on this?

GaN technology is going to change all this, allowing a Class D to sound just as good as Class A It's not cheap, but it's relatively inexpensive for what you're getting

I guess I came right in time. 3 hours after released of this video.

Just for the record, Class D is not digital. The D stands for somerhing else. Hey Paul, what does the D stands for?

Paul you were all over the place in this one. You never answered the question. It was a very direct one.

i dont want my music chopped up. Thankyou very much

I would like a more detailed explanation please.

Half of your head is missing

Keep switch mode FAR... So VERY far away from my audio. My listening room is segregated to it's own circuit in the house, with it's own db box. You are not allowed to even plug in a phone to charge here. All equipment was home made, so power supplies also have 47nf caps over the diodes (BY229) in the rectifier to assist with cleaning off crap that comes from mains and are translated to the 30 or 50v path. Satan himself invented switch mode psu just to mess with us purists. Switch mode is a terrible solution to a world wide design flaw. Mains should have been 200hz globally. No way to recover from that now, unless you are willing to make all current electronics obsolete and start again.