What is an amp? And why does it REDUCE the volume?

  Рет қаралды 3,379

Passion for Sound

Passion for Sound

Күн бұрын

Пікірлер: 37
@triveninanda
@triveninanda 7 күн бұрын
Hi Lachlan! Great video. At 12:33, the left side calculation is wrong. At the gain stage, the noise levels will be 0.4V and not 0.8V. 12:38
@PassionforSound
@PassionforSound 6 күн бұрын
Oops! You're right. Thank you.
@tpro7224
@tpro7224 7 күн бұрын
Impressive amount of info packed in less than fifteen minutes. Hopefully your advanced hobbyists weren't bored, but as a newbie it's super valuable, thanks!
@PassionforSound
@PassionforSound 6 күн бұрын
I'm so glad it was helpful!
@taidee
@taidee 6 күн бұрын
I'm a fan of this series, keep it going Lachlan and thank you.
@PassionforSound
@PassionforSound 6 күн бұрын
I definitely will! Thanks for letting me know that it's valuable
@SteveASU
@SteveASU 6 күн бұрын
Yeah, this is great! Keep this series going!
@PassionforSound
@PassionforSound 6 күн бұрын
Fantastic! I definitely will. 🙂
@martinfox2244
@martinfox2244 7 күн бұрын
Thanks! Keep the series going
@PassionforSound
@PassionforSound 6 күн бұрын
I sure will 🙂
@giorgosapo4508
@giorgosapo4508 6 күн бұрын
Awesome video Lachlan 👏explaining so many things in a few minutes, very easy to understand!
@PassionforSound
@PassionforSound 6 күн бұрын
I'm so glad it was helpful!
@FisherMan-bh9dn
@FisherMan-bh9dn 6 күн бұрын
I took my family to Speaker Land last summer. It was much better then Disneyland and wasn't as expensive. I was pleased to see it promoted here. 👍
@PassionforSound
@PassionforSound 5 күн бұрын
😂😂
@Maccaboy1984
@Maccaboy1984 6 күн бұрын
I love that a dac is considered a ‘source’…. Surely the digital that feeds the dac is the source, the cd transport, streamer etc
@PassionforSound
@PassionforSound 6 күн бұрын
It's a source in relation to the amp. I'm trying to keep the numbers of terms to a minimum in these videos to avoid confusion.
@valentinobv
@valentinobv 7 күн бұрын
Hi. I really enjoy your videos, they are on point and well explained. By the way, in your right corner (left as I watch the video) is the new K17 from Fiio? :) Cheers.
@PassionforSound
@PassionforSound 6 күн бұрын
Yep! K17 review is coming soonish... I'm glad you enjoy the videos!
@User_not_found_403
@User_not_found_403 7 күн бұрын
Thought this was novice. but now things i didn’t get about amps, attenuation and db now make sense :)😊😊
@PassionforSound
@PassionforSound 6 күн бұрын
Yay! That's great news!
@dazza5456
@dazza5456 6 күн бұрын
Thanks Lachlan, very informative, actually went back and viewed the rest in the series. Would like to know a bit more about chip sets, many say they don't make a huge difference, but the company's that flog these products seem to make a big deal out of them. Looking forward to the next lesson 🤟
@PassionforSound
@PassionforSound 5 күн бұрын
Hey dazza, thanks for watching! Chipsets are a tough one because I don't know enough about the inner workings of their filters. What I'd recommend as an explanation of why they're actually different is to watch my video called "The Secret to Wonderful Sound" and then my interviews with Rob Watts who designs Chord DACs. He explains in quite technical terms why his designs produce soundstage depth in a way that no regular chip designs (except the new AK4499 + AK4191 combo) seem to do.
@dazza5456
@dazza5456 5 күн бұрын
@@PassionforSound Thanks, will do
@deadline7610
@deadline7610 6 күн бұрын
Well Done. Thank you & Linsoul. Around 8 min. into your video you talk about speaker requirements. I was looking at demo-ing a new pair of speakers. Right now I have a 5.1 system sending front 3 speakers to a external amp (via pre-outs). That is easily powering my 3 front 8ohm 91 sensitivity speakers no problem. The L/R demo speaker are 6ohm 88 sensitivity . My external amp can easily power them. Am I looking for trouble asking my Emotiva BasX A3 external amp to handle different speakers (center speaker 8ohms - L/R 6 olm"s) with different spec. ? I hope you understood where I'm going with this question. Thanks
@deadline7610
@deadline7610 5 күн бұрын
I reached out to emotive & got my answer. Yes it will
@PassionforSound
@PassionforSound 5 күн бұрын
Awesome! I was just about to say that it looks fine on paper, but that I haven't heard the Emotiva so didn't want to guarantee anything. They can though! 😁
@sudd3660
@sudd3660 6 күн бұрын
stated here: use the max output from your source or dac. and then here i come using a digital dsp as volume control, into dac and poweramp. i guess that normally you would have a preamp between the dac and poweramp. or a integrated amp which adjust the volume after the internal dac just before the power stage. but in my case my dac sees variable volume, so my noise is highest at low volume relatively, so that is why i can not hear an noise?
@PassionforSound
@PassionforSound 6 күн бұрын
It may be that your setup is introducing a noise floor that's higher than ideal even if it's not audible. An inaudible noise floor can still do things like reducing the sense of soundstage size. That said, many volume controls introduce their own issues with signal loss (i.e. damaging the signal as it passes through) so you could be trading one issue for another and the net result is equal. If you're enjoying your tunes, that's all that matters!
@robertobuatti7226
@robertobuatti7226 7 күн бұрын
You explained it very, very well but I still found it quite confusing as I only have a basic understanding of audio, having several learning disabilities for all my 43 years and a low I.Q. I find things hard to follow with anything including math or science because I failed at those when I was in school and only have a basic understanding of math, but am interested in getting the best sound quality for my headphones, IEMS and speakers. I find the numbers confusing and way to complex in what an Amp does with voltage and current as I want to get the correct power for my drivers and don't want to blow out any of them but I do appreciate the explanation for a beginner audio enthusiast who wants to understand how these things work at a basic level. Could you do a very basic video in what RMS power is vs peak power in audio, I always see this spec and get confused.
@PassionforSound
@PassionforSound 6 күн бұрын
Hi Robert, sorry about all the numbers in this one. It was unavoidable. I've got more videos coming that will help to explain power for you in (hopefully) simple terms. It's very hard to keep the numbers out of it though because there are multiple factors that influence each other and it's hard to demonstrate that without the numbers. I'll see what I can do.
@robertobuatti7226
@robertobuatti7226 6 күн бұрын
@PassionforSound Oh thank you for that, I really appreciate it and thank you for the feedback, I'll be looking forward to watching that video.
@choffee
@choffee 7 күн бұрын
Not sure I follow the logic about the noise. The calculations on the right show in the last amp stage the noise has been multiplied by 8 but for some reason the signal has not. I think the output on the right should be 64v of signal so the ratio is the same.
@choffee
@choffee 7 күн бұрын
Ah spotted it. The DAC signal has dropped to 1v. I suppose that gives a reason not to do volume control in the DAC as the noise is constant. Do most pre-amps output a lower voltage signal? I suppose the volume control is cutting the volume as the DAC is sending out full volume signals so the amp can reach it's max if require and then the amp is only setting it's max for that max volume. Do amps work like this inside? Would it not make more sense to do the voltage amplifiction first so that the signal is stonger than any noise introudced in the amp? Then use a volume stage after the pre-amp so that the power stage gets the cleanest signal?
@choffee
@choffee 7 күн бұрын
A quick google for some block diagram of amplifiers seems to suggest that order of pre-amp -> volume/tone -> power amp which makes sense to me at least.
@PassionforSound
@PassionforSound 6 күн бұрын
If you boost the voltage first, you also boost the noise. That's why volume controls are almost always attenuators whether they're integrated in the amp or separate in a pre-amp
@JonDeth
@JonDeth 7 күн бұрын
*You did extremely well;* I'm an electronics=electrical engineer less completing my degree. We focus on voltage amplification in terms of SSA; small signal amplifiers. We focus on voltage and current when it comes to driving physically heavy loads such as speakers or motors; it's applicable to many things. When you choose to spend big money on a stereo system, in some cases you can buy speaker ensembles in a pair of enclosures that are paired with an amplifier with each being designed for one another. *This means the voltage and current balance collectively producing the power has used a highly sophisticated and reliable strategy so the speakers and amplifier are power matched.* So, arbitrarily, if the speakers reach maximum efficiency with 25 volts AC and 5 amps of current, changing speakers may have less favored results. Furthermore, we can get into better orchestrations of science because inductors in fact see VAR, not watts. VAR is volt amperes reactance and a far more accurate way to grade devices such as speakers and amplifiers when driving a reactive load. When we get into VAR based engineering for audio, it's why some companies are able to get absolutely insane amounts of money for equipment lol. In laymen's terms, it means the speakers and amplifier have been designed based on maximum efficiency characteristics matching one another's test data. There is a synchrony issue with the phase of voltage and current reaching the speaker's inductor at different times and and at a particular frequency, the two are then closest in phase at that specific point and that power reading tells us the VAR. If a company designs speaker ensembles and an amplifier based on VAR data, whether you have the volume at 10/100 or 100/100, it's always reaching maximum efficiency of power transfer at both those settings and everything in between. *Now with all that said, the boil down is do you prefer paper or plastic when it comes to cone material and other such things.* This really means no matter how efficient things are on paper and the test equipment, textures you prefer and the presence each speaker in an enclosure presents most often makes a listener whose concerns have very little to do with VAR efficiency engineering. It's important and scientifically highly important, but when it comes down to what you personally like, VAR means very little if the speakers used for the designing of that amp aren't of materials you prefer. Of course, you can always find a system with the materials you desire and VAR incorporated into the machines that make that matched stereo system. I imagine these days there's plenty of companies using a variety of materials and tuning everything to their flagship amplifier models so no matter what arrangement the consumer desires, they can give you the best of everything in a single solution.
@PassionforSound
@PassionforSound 6 күн бұрын
This is really interesting information and highlights the complexities that most of us have no idea exist in HiFi.
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