Does Op-amp Rolling Work?

[milosz]

Please don't give clicks to that shill

Censorship seldom leads to anything good. Have you listened to the files he posted, or is this an example of "contempt before examination?"

 

[Buckeye Amps]

Censorship seldom leads to anything good. Have you listened to the files he posted, or is this an example of "contempt before examination?"

Apparently you haven't read this entire thread...

 

[Geert]

Censorship seldom leads to anything good. Have you listened to the files he posted, or is this an example of "contempt before examination?"

Start here https://audiosciencereview.com/foru...any-confused-master-thread.61010/post-2256982

 

[milosz]

So, through opinion and innuendo it has been proven he's scamming with the files he posted. I see.

 

[Buckeye Amps]

And through objective, science-based facts. Yes.

 

[wwenze]

BTW- IMHO, I can order customized Converse sneakers. Why don't the manufacturers of this so-called TPA3255 Class D amp put a choice on the op-amp before placing order? For example - customize it with: 1. "meh" chip, 2. good chip, 3. better chip, 4. best chip, and 5—you can't beat this cheap I meant chip. . Dell e-commerce site started this way for selling home PCs, I'm wondering why Aiyima and Fosi Audio (and the latecomer Douk) can't do it? Why do I need to DIY it myself? If I want a certain signature of music where lots of reviews and recommendations are already done, why can't I pre-ordered it with the chip I think will work to my taste and just try them into my speakers?

That way I don't potentially destroy (or scratch it up) enclosures and the main board and most importantly. Also, I would like to save my very-very precious time!

Can you define what is 1. "meh" chip, 2. good chip, 3. better chip, 4. best chip, and 5—you can't beat this cheap I meant chip?

If not how do the manufacturers know how many buyers would buy what?

This is unlike Dell PC where a Celeron performs different from a Pentium and costs different from a Pentium. Meanwhile the other parts are often swapped without informing the customer since they do not affect the performance. There are lots of comparators, DACs, sensors on motherboards and chips, btw. We just don't hear about them because the only thing snake oil buyers know are that one op-amp in that particular location. Let's totally forget that the amplifier module has its own differential-amplifier input stage than you cannot replace.

Furthermore to add, we are talking about a component which does not bottleneck the performance. This is like giving a 400W computer a choice of 600W and 800W power supplies, you don't see Dell doing that either.

 

[amirm]

So, through opinion and innuendo it has been proven he's scamming with the files he posted. I see.

The fact that the captured files have different levels is not an opinion. It is a fact:

The third one which he and others seemingly preferred is so much louder that 173 samples clipped.

As I have explained before, innocent explanation is that they don't know to measure to make sure levels of matched in such comparisons.

Not so innocent explanation is that they played with each captured files until their favorite sounded "better" and post it.

Finally, he didn't post the files blind and ask people to vote. He specifically said which file is which, leading to folks naturally preferring the last one, especially when he pre-biased people in his video.

There is a right way to do such comparisons and they clearly either don't know, or do know and attempted to mislead. So don't put this at our feet. If I had posted these files, i would get the same criticism.

 

[Muddywaters]

He posts some example with audible differences. I suspect these are also measurable. Danny gets some things wrong but also he gets some things right.

very little if at all

 

[oleg87]

So, through opinion and innuendo it has been proven he's scamming with the files he posted. I see.

No innuendo here - failing to match levels reveals ignorance or intentional avoidance of the most basic controls. Any self-appointed audio expert so staggeringly ignorant is making content for entertainment purposes only.

 

[Tranquility Bass]

Please don't give clicks to that shill

You flat-earther LOL

 

[Buckeye Amps]

You flat-earther LOL

Huh?

 

[Bruce Morgen]

Huh?

Danny Richie calls folks who don't buy into his b00|$hit "flat earthers."

 

[Buckeye Amps]

Danny Richie calls folks who don't buy into his b00|$hit "flat earthers."

Ohh. Well that says A LOT about him

 

[pma]

Not so innocent explanation is that they played with each captured files until their favorite sounded "better" and post it

I am quite sure this is the case.

If the music sample files are made properly, level matched an time aligned, without clipping, then the difference between them after swapping the fitting opamps is negligible, far below any audibility threshold. “Fitting opamps” are those that have appropriate parameters for the circuit used and remain unconditionally stable in this circuit.

I doubt it is possible to persuade those who do not wish to be persuaded and who are not willing to learn.

 

[Old_School_Brad]

He posts some example with audible differences. I suspect these are also measurable. Danny gets some things wrong but also he gets some things right.

He gets most things wrong and is manipulative with bad intentions. Yesterday, while browsing through the comments on his video, I noticed that most of the critical comments had been removed. Just days earlier, the majority were critical, but now the balance has shifted completely. For example, I couldn’t find this comment yesterday:

Does Op-amp Rolling Work? [Video]

Let's give Danny the benefit of the doubt and say he didn't deliberately put his finger on the scale and make his recommendations progressively louder, then something is unusual with those 'artisanal' op-amps as they are louder in the recordings... Maybe someone would know how that could be...

www.audiosciencereview.com

Why would someone remove a comment like that?
There’s no justifying it and no way to hide it -he knows exactly what he’s doing, and his intentions aren’t good.

 

[375HP2482]

So, you're saying that opamps don't matter, so if my audio gear had IC709 opamps in it, it would sound just as good as if it had Sparkos SS3602's? Hmmm. I'm not so sure about that.

You might be surprised. We made and used PA mixing consoles in the early 70s that used LM747s (almost the same as the LM709, but duals like the LM5532). With a 0.5 V/uS slew rate you might think the sound was compromised, but not much. The musical energy in the higher frequencies is generally too low to challenge that slew rate. Recordings made directly off the console sounded good, especially after the introduction of electret microphones.

The summed channel noise, however, was a different matter. Fortunately, even with direct-coupled compression drivers, the audience was far enough away from the speaker stack that the noise wasn't really audible during performances.

You have to take your hat off to the inventors of the LM5532 at National Semiconductor, a product that has stood the tests of decades in audio. I still have an original copy of the National Semiconductor applications book, a huge bible for DIYers building just about anything in lower-frequency analog applications (built a phono preamp from it). Yes: LM5532's and electret microphones seemed to have been introduced in time to pave the way for the digital audio era.

 

[pma]

You have to take your hat off to the inventors of the LM5532 at National Semiconductor

It was SE5532, NE5532 in fact, not LM. Signetics company. But I agree with your post. Only that 741 or 709 could have been used only in case of low level stages (1V). Some designs used it to get >8V driving stages and then the slew rate limit was audible.
Below is the original Signetics datasheet, with application circuits.

 

[amirm]

I still have an original copy of the National Semiconductor applications book, a huge bible for DIYers building just about anything in lower-frequency analog applications

I would spend hours going through it. They seemed like gift from heaven! Free schematics for all sorts of things.

 

[pma]

I have a test rig to test dual operational amplifiers, at low gain and high gain.



If there are readers interested here, I can make quite detailed comparison of LME49720 (LM4562), NE5532, OPA2134, TL072 and LM1458 in a new separate thread. THDlevel, THDfrequency, CCIF IMD, DIM24 and DIM48, square responses. Just let me know.

 

[boxerfan88]

I have a test rig to test dual operational amplifiers, at low gain and high gain.

View attachment 438438

If there are readers interested here, I can make quite detailed comparison of LME49720 (LM4562), NE5532, OPA2134 and LM1458 in a new separate thread. THDlevel, THDfrequency, CCIF IMD, DIM24 and DIM48, square responses. Just let me know.

View attachment 438439

I am interested. Looking forward!