Thinking what you need to DO when matching Preamp & Poweramp, Don't. There is nothing to be matched.

[@NickP333]

Always appreciate your thoughts on anything audio related, Angela-Gilbert. I find that things like total gain, output impedance / input impedance, speaker sensitivity, etc. are a good place to at least start, but I’ve also heard some combinations that don’t really follow those basic rules and sound fantastic. It’s nice to hear your thoughts on the subject. Very much appreciated. Thank you. 😊🎶💜

[@angela-gilbert]

@@NickP333 Math is a good start. Ultimately, it is the listening to be the final judge. As I have stated in a couple of my replies here. I have used impedance combo to tune the system sound. When doing that, the math rules are out the window.

[@kvrhifi]

Excellent topic. This was reason I stick with RMe dac I can control output voltage for my Yamaha as3200. ( balanced connection) Dacs should have output voltage settings. Reviewers not mentioning about voltage outputs or gain levels . I learned how important to find balance between amps /pre amp gain , dac voltage output and speaker sensitivity level ..

[@angela-gilbert]

Voltage level vs Gain in db isn't a very common topic but it is correct way to understand the loudness and over all system volume. Marketing departments have not been using it to inform the public. Therefore, reviewers has to use terms that the general public understand. Many of the reviewers are also not necessary has deeper understanding of the topic from the technical point of view.

[@lm74829]

I felt this video was like made for me… thanks !

[@angela-gilbert]

@@lm74829 Glad you enjoyed and found it is useful.

[@danielesbordone1871]

Usually the rule of thumb is input impedance of amplifier / output impedance of preamp has to be a ratio of at least 20 , the higher the better , but I agree with the final judge being the listening test.

[@angela-gilbert]

Ratio of 1:20 is not even necessary. Higher is not always better, rather has lesser and lesser effect. Many applications allow much lower ratio and wouldn't hurt anything. As I have mentioned in the video, there are companies using 1:1 and they work just fine. When output and input impedance ratio get low or even goes into negative region, one can use to tune the system sound along with the length of the interconnects. However, in audio application length of cable usually has minimal effect of sound due to its low frequency range.

[@greenlanternseven]

AGY the Tesla of Audiophile HiFi audio equipment a super genius electronic guru that builds HiFi gear that puts the Titans to shame a Dragon Slayer at a quarter the price for some of the finest quality in music listening and can modify most people s personal amplifiers to epic levels to match , we are very lucky to have Angela Gilbert Yeung because the knoledge this person carries is Tesla and Einstein territory. ..I love Angela Gilbert Yeung SUPER GENIUS

[@ThePerkri]

Timely…. As an avid diyer, the issue of gain is something I am just starting to dive into. First experience with a problem of too much gain, was with a single ended EL84 amp that uses a 7199 tube on the input. Well, it is insanely sensitive…. So much to learn….

[@angela-gilbert]

@@ThePerkri The first rule of learning from my experience is don't be afraid to fail. As long as you have learned something, the lessen is worth it.

[@ThePerkri]

@@angela-gilbertVery good advice! Being a perfectionist is one of my personality defects… Suited me well in my previous career. Music, electronics, audio gear and photography have been part of my life for as long as I can remember. Pursued photography, in hindsight, should have taken my electronics high school teachers advice and gone the electronics route :) Been working on a pair of speakers for the past year that I am planning on taking to market with a friend/business partner. But I need to be open to having things not work perfectly right out of the bag.

[@angela-gilbert]

@@ThePerkri There is a fine line between good enough and not good enough. There is no perfect. What we think is perfect today may turn out junk 5 years from now looking back to our own work. What I am saying is, if it is good enough, push forward. Other will give you their opinions and some of them may worth your attention and some not.

[@ThePerkri]

@@angela-gilbert Thanks again! Agree, had the same thing in my photography career. Things I photographed long ago, do not stand up to what I can do now (if I did it any more…) I did However, take photographs when I was young - personal photos - that I am still very proud of. We are starting to take the prototype around to get people to listen to. So far, so good! Gotta, as you said, push ahead.

[@jameshutton5979]

GREAT CONTENTS

[@freeradical6390]

Artist- Seal Song- Violet :)

[@rvaillant]

Thank you for your thoughts. I figured "just hook it up" would be your answer, ha. Is there a formula to calculate voltage gain of an amp by using output watts and input sensitivity, or some other way as most do not give a voltage gain of their equipment.

[@angela-gilbert]

Ahhhhhh, I am becoming predictable to you. 😆😁 Yes, there is a formula to calculate voltage gain in db from power output and input sensitivity. The voltage gain formula is Voltage Gain (db) = 20 ((log) Output Voltage / Input Voltage). For a 200 watt into 8 ohms power amp, it is 40V into 8 ohms. If the input sensitivity of this 200 watt power amp is for example 2V. The equation is Voltage Gain (db)= 20 ((log) 40/2)=26.02db. Most will consider it is simply 26db of gain.

[@rvaillant]

@@angela-gilbert Thank you. I have seen enough of your videos to know you would say, hook it up and see, ha.

[@n.lyndley.9889]

Take this advice from AGY, one of the most knowledgeable audio designers alive, rather than a KZbin reviewer with zero engineering background.

[@angela-gilbert]

Most knowledgeable? Far from it. I am only sharing my experience and hope people understand what I am saying.

[@GeneralLao]

This may be narrow minded thinking? I bought a power amp and same brand matching pre amp. was an amazing combo. I sold the power amp and bought the same brand Mono blocks. Again perfect match. I would assume the manufacturer would do their best to make sure the gain was correct with both their amp and preamp. I am not inclined to mix and match amps and pre amps.

[@angela-gilbert]

@@GeneralLao The manufacturer will do their best to match the gain but what is gain matching? What gain is perfect? It depends on the output level of the source and also depends on the sensitivity of the speaker. There is no perfect match. That's what the volume control is for. With now a day digital source being such high output, some of the mechanical volume control doesn't have enough attenuation to keep the music quiet enough for some apartment condo set up. Or Music is being way too loud when thr setting at 8 O'clock. It is a more common issue now.

[@GeneralLao]

@@angela-gilbert Yes I will be honest, With Digital my volume sits at 8 o'clock, when I play vinyl I get to 9 o'clock. At the end of the day, it sounds good to me.

[@WeeWeeJumbo]

i need to start rockin hats, jackets and matching kerchiefs. where do i begin? i’m not rich

[@angela-gilbert]

@@WeeWeeJumbo I designed and sell a lot of clothes. In this video, I painted me jeans and shirt only. The jacket, hat and pocket square are all stock waiting to work for me to put some paint on them. If you are on a budget, you can get some from thrift stores. Some of the online store also has good selection new and used. I got a lot from Yoox and some from ebay. Wait for the sales from Yoox if you ate buying new. They have stupid sales once in a while.

[@WeeWeeJumbo]

@@angela-gilbertthanks, cousin 😃

[@StealthParrot]

I thought that maximum power transfer is achieved when output impedance matches the load impedance? Whether or not this impacts sonic quality, I have no idea.

[@angela-gilbert]

@@StealthParrot You are correctly about the maximum power transfer. However, in the case of preamp driving a power amp at home use with relatively short distance, we want maximum voltage transfer..... mostly. In some exceptions, using impedance mismatch to tune the system sound is not unheard of. At least I have done it many times.

[@StealthParrot]

@@angela-gilbert Got it, thanks for the clarification.

[@thomasfi1275]

Is it possible to connect a pre amp to the line level input of an integrated amp?

[@angela-gilbert]

@@thomasfi1275 Of course you can. Adjust the volume control on the integrated amp to obtain desire gain.

[@thomasfi1275]

@@angela-gilbertthe data sheet of my lector zoe pre amp says, 20dB gain and 20V@250Ohm output…?

[@angela-gilbert]

@@thomasfi1275 Simply connect the preamp to one of the line level inputs of the integrated amp. Start both volume controls from zero. Turn the integrated amp volume control to approx. 9 O'clock. Play some music, then slowly turn up the preamp volume control. Get a feel of where the volume controls sound the best. Then enjoy the music.

[@thomasfi1275]

@@angela-gilbert thanks for your support! And please continue with tech talks.

[@timleelim9930]

The best way to judge an audio designer is to see what his/her record collection looks like. Definitely passed with, er ... flying colours 😂

[@angela-gilbert]

Thanks. This is about 1/3 of the whole collection.

[@CarlVanDoren61]

EE audiophile same design w cables

[@angela-gilbert]

@@CarlVanDoren61 My biggest beef about cable is when companies are using high frequency transmission line theories apply towards audio base band cable. That is when I draw the line.

[@CarlVanDoren61]

Yes, crazy expensive 😮​@@angela-gilbert

[@CarlVanDoren61]

PAD 1m silver usb cable DAC Direct, no preamp 😊 DAC to analog JLA crossover Path Audio 1.2 10w attenuator

[@akhtarizod5802]

Compatibility match , output impedance of preamp,/ input impedance of power amp.

[@angela-gilbert]

@@akhtarizod5802 How do you mean by "match"?

[@n.lyndley.9889]

This is fully covered within the video.