#Class AB

[audio-luddite]

Dangerous.

I got my Tax statement and it is a refund. DO NOT SPEND IT!

But hey can it hurt to look around?

First I checked up on a couple of LPs I have been thinking about. I want a copy of Joan Baez "Diamonds and Rust". Back in Uni my audio buddy and I listened to that one a lot. It was his copy. I still remember the sound. I want one of my own to listen too with my current system.

On his old system ARC SP3a1 preamp, HK Citation 12 amp, Advent speakers (there was only one model). It was warm and rich and resonant. There was this one cut I remember an amazing piano sound with that LP.

The other LP is maybe perhaps a gourmet copy of Famous Blue Raincoat by Jennifer Warnes. I have two copies of consumer grade pressings. There are some old ones kicking about. IMPEX made one of those fancy box issues which costs three digits and even though I really like the record that is too much money.

I found a less fancy Impex issue, but it is sold out. Discogs has some but..... Damn what the market can bear is quite a lot sometimes.

OK lets just check out the CAM listings. No duty and usually no tax, but shipping can be a bitch for heavy stuff. I seem to like stuff that is heavy. Hey there are some interesting amplifiers.

This one caught my eye.

It is a Pioneer M 25. Dual mono check, that is good. It looks really cool to me. It is 150 Watts full tilt, but is high bias and runs Class A up to a few Watts. She is very handsome to me. It is not very unreasonable at just over $1k, but from a dealer that promises free shipping coast to coast from Ontario. (That is at least $100 bucks). It was a statement amp for Pioneer back in the day. Really tempting, mostly because of the look, dammit.

Oh it's harmless to keep looking right.

Just look for amplifiers under $1100 and there are hundreds. (No tube amps worth looking at that price for sure)

Oh, what is this?

These are Audio Research DS450s. 450 Watt per channel stereo. The owner used them mono into the second ugliest speakers I ever saw. He wants $4700 for the pair original cost $18k. So one for $2350? They are solid state. According to ARCDB they are quasi Class D? That is interesting from a technical perspective.

The ARCDB description notes the power supply is conventional linear with big transformers and Capacitors. I doubt those tiny class D amps can actually work as I do not see how small switching power supplies can put out enough amps. I mean the wires are tiny too. Normal speakers need amps more than volts to work right. But here the output circuit is high current switching. And ARC brags they make everything in house rather than buy "modules" from you know where. So efficient, and ampere heavy.

Too damn expensive for this human, but I am intrigued. Leave it to ARC to avoid the Switching Power supply and have a heavy and expensive iron hunk in the front. I think that is confirmation that of my suspicion there is a fundamental flaw in Class D tiny amps.

I find it amazing the price on much of this stuff. I mean it is just for a stereo after all.

I also find it amazing that reviewers spew so much ignorance about the stuff they criticize. Regarding the big ARC I read a man who praised all the other amps ARC made as "Class A". Obviously confusing the type of circuit with some "class" of quality. He also thought that the aluminum case was for shielding RFI from getting into the amp, but with 400khz switching frequency, it was probably shielded to keep stuff in.

It is fun to explore the listings. I have found treasure from time to time.

[takmiblog]

不都合な真実（２）

　廉価なD級アンプ素��の性能をデータシートで見る限り、低出力時のTHD値は確かにAB級アンプのそれにかなわない。しかし実際に低出力（ミニワットのレベル）で静かに両者を聴き比べてみると、D級アンプのプレゼンスの良さに驚かされる。

　これはあくまで私の仮説であるが、D級アンプの場合、たとえ再生音量を絞ったとしても、駆動電圧振幅は常に一定かつ高位（=Vdd）に保たれるため、Loud Speakerを駆動する能力（リニアにスピーカを動かせるかどうか）が（AB級アンプに比較して）高いためではないかと思われる。鳴らしにくいスピーカで比較すると良くわかる。D級アンプは実に軽々と鳴らす（鳴らしきる）のだ。（大雑把に言うと）D級アンプの場合、パルス幅の正確性は担保されているのでGNDとVddの（動的）安定性にのみ着目すればよい。見通しがいい分、隘路にはまり込むリスクが小さい。総合的な音のキャラクターはプリアンプの設計でどうにでもなる。よってD級アンプがAB級アンプを駆逐するのは時間の問題なのである。

　先人・先達たちが

『D級アンプのほうがAB級アンプよりもスピーカの駆動能力が高い』

とこれまで評してきたことは、このことを指すものと思われる。やはり趣味のオーディオはデータの優劣で比較できるほど単純ではない。古い世代の人は（出来の悪い）D級アンプになかなかなじめないかもしれないが、新しい世代の人はAB級アンプやA級アンプの洗礼無しにD級アンプの音で育ってゆく。そんなところだろう。

An Inconvenient Truth(2)

[sunnibits]

does anybody need some soft jarthur in these trying times

[mellancholy-mushroom]

fantasy high junior year bingo!! i think some boxes are much more likely than than others but i’m excited to see ashsjsh :3

[takmiblog]

PAM8406

Class AB <-----> Class D

Power Amplifier

[guitarbomb]

Supro Unveils High-End Amp Series: Delegate Custom & Ambassador Custom

This new Supro series includes two combo amps, the Delegate Custom and the Ambassador Custom, Both hand-built in the USA using “ultra-premium” components.  Supro Style Supro’s Delegate Custom and Ambassador Custom both look great and have that classic vintage aesthetic.  The Valco-inspired wraparound cabinets, crafted from poplar and available in black or burgundy custom Scandia Tolex with gold…

[brittasbaggles]

now kith

[jesse-pinko]

Every other aspect of Jesse’s trauma makes me go oh no poor blorbo :( but his relationship w his parents and thinking ab it in the context of the series aftermath actually makes me unwell… they never even knew him they only ever saw the worst in him and now they’ve had that validated by his own actions and they’ll never know how sorry he is and that he was a good kid at heart and they didn’t imagine it and they still love him but how can they have loved him if they never even knew him and only ever saw the worst in him *flatlines*

[diapered-bun]

Rocking horses but make them dino themed! Baby needs to go ride their friendly trike(triceratops) to get their big feelings out. (Grinding against it in wet padding.)

[theoreticallyliving]

okay chat what if healer (cleric?) Vernias and wizard Sophist teaching eachother spells when they're bored

what if Sophist learns to heal and to revive and Vern learns fire spell and thunder spell n stuff that's more on the offensive

what if them, Nick, and Brent were on a journey together but didn't know eachother very well, like this is a sort of found family type trope or smth, and as they start like getting used to eachother and trusting eachother, Sophist and Vern stay up late at night and talk about everything and nothing, and one night they talk about their magic and like how they learned to cast their spells, and it evolves into them sneaking away from camp (they were probs supposed to be on guard but like the others will be finee) to find someplace where they won't disturb the others while they show eachother exactly how to do each spell

what if the other two only find out after Vernias recieves a critical blow in battle, taking the last of his hearts, and they see Sophist rush over and perform a revive, in the exact same way they had seen Vern do it over and over again, with an unsure look on his face as he recalls each step in his head and prays that he doesn't somehow mess this up

Vernias waking up, a huge smile on his face, exclaiming a cheerful "you did it!" and practically tackling him to the ground with a hug

what if all that?

[mintypsii]

probably won't finish this but yay screenshot redraw

what are they even gossiping about

[feel-the-fire]

That could’ve gone better.

**Note: This is a 20 year class reunion. Characters are 36 in this verse.**

[rogdona]

[amndees]

one more kuboyasu doodle before heading to bed bc this time he’s smiling :o)

[mylove-thresher]

Bunny stage…… fuaa……

[hommiepic]

Hi hiiii thought I’d share some of the drawing I made for my sketchbook cover!

My art classes first assignment was to decorate our sketchbooks sooo yk what I HAD TO DO!!

I guess u guys also get to know my name now so, like, hi