2 x Fosi V3 + 2 x 10A 48V psu - what the hell?

[jEDGEc0m]

If it was not in phase singer would never end up dead center ;-)

I know I know, I owe the recording! Too much work these days :-(

I have the microphone, but the ADC, you will not like, it's this one:

View attachment 480071

As I asked before, was it the Fosi labelled 19-25dB you used on right channel with LA90 on left?
You could put the 25-31dB Fosi with the LA90 instead of the 19-25dB - see if you find maybe an issue is isolated to just that one Fosi amp of the pair.

 

[dcolak]

As I asked before, was it the Fosi labelled 19-25dB you used on right channel with LA90 on left?
You could put the 25-31dB Fosi with the LA90 instead of the 19-25dB - see if you find maybe an issue is isolated to just that one Fosi amp of the pair.

I don't remember :-(

I'll have to do it again. But, I did use the XLR, I don't use the RCA connection.

The stereo image with both is present, singers are in center of sound stage, it is in phase 100%.

 

[jEDGEc0m]

I don't remember :-(

I'll have to do it again. But, I did use the XLR, I don't use the RCA connection.

The stereo image with both is present, singers are in center of sound stage, it is in phase 100%.

I quickly put my pair of speakers out of phase. I've not actually heard music out of phase for a long time or in any appreciable quantity.
arguably, something that is panned in the middle/mono kinda still sounds like it's in the centre. similarly, if i put the music in mono, the singer kinda still sounds centred. but just sounds bad and wrong.

 

[dcolak]

Singer should not sound in center if speakers are out of phase, how could he, the left and right are canceling each other, the voice should be all over the place. There is nothing wrong with phase using FOSI V3's.

 

[dcolak]

SMSL-SU 8 -> FOSI V3 mono -> Klipsch B3 -> not bad, not bad at all

 

[Hendrixon]

Since mid July up until mid November and still no measurement? no wonder this thread died
I just want to point out something, your right speaker goes to a corner, your left into an open space... and you used that setup to compare different amps per speaker regarding bass?

Good job

 

[dcolak]

Since mid July up until mid November and still no measurement? no wonder this thread died
I just want to point out something, your right speaker goes to a corner, your left into an open space... and you used that setup to compare different amps per speaker regarding bass?

Good job

A... no, this is a different room, different speakers. Try to keep up There is a door there too.

 

[Hendrixon]

Ahh a door, sorry mate, that changes everything lol
Different room, got that
So FF to today, bass still not there with the V3m?

 

[dcolak]

JBL Array 1400 - no bass, "hard sound"

JBL 312II - no bass, "hard sound"

JBL S38II - muted bass, muted sound

Klipsch B3 - yes bass, seems ok

The door is hard wood with sonic insulation (natural wool) and mass loaded vinyl. I bet it stops sound better than 99% of American made walls, lol.

 

[Hendrixon]

With the drywall and all that, I guess so.
Where I live we don't use that, here it's all cement blocks and concrete... a corner here reflect ALL the bass lol

 

[norman bates]

I've been looking at some older audio research class d mono amps (ds450m) locally.
It has a large transformer and piles of 10kuF caps under the hood.

Maybe you (we) are seeking massive current delivery from our amplifiers for the elusive bass........................

Audio Nexus: Audio Research integrated amplifiers Preamplifiers DACs New Jersey Home Theater NJ Audio-Video New York Stereos NY CD & DVD Players Plasma & LCD TV Projectors NYC Loudspeakers Stereo Receivers Electronics

Audio Nexus is an Audio Research, video, stereo, & home theater dealer & installer in Summit, New Jersey, minutes from New York. This page is our Audio Research newsletter. We sell Audio Research, Arcam, Kimber, NAD, PrimaLuna, Runco, Sonus faber, Totem Acoustic, Vandersteen & much more.

www.audionexus.com

so, it's class d with a linear supply......................

 

[Heinrich]

... The door is hard wood ... lol.

Mmmh, still "discussing" the initial rant on how really bad the Fosi amps were? The guy on the screen you posted I saw at least one time before, the very same moment, if my recollection doesn't trick me. Do you listen to him often, repeated?

I use my two Fosi V3 (the old stereo type) for over a year now and experienced no problems. I bought a third recently. You tell me that I got fooled? I use them with top ranking (Olive's) speakers and should detect an incorrect sound. Maybe I'm deaf or dumb or both.

You could measure the difference of the amps in situ, in actual operation if you had a technical background as a foundation. I you want to, please drop a line to trigger a summary on the how to.

 

[dcolak]

Mmmh, still "discussing" the initial rant on how really bad the Fosi amps were? The guy on the screen you posted I saw at least one time before, the very same moment, if my recollection doesn't trick me. Do you listen to him often, repeated?

I use my two Fosi V3 (the old stereo type) for over a year now and experienced no problems. I bought a third recently. You tell me that I got fooled? I use them with top ranking (Olive's) speakers and should detect an incorrect sound. Maybe I'm deaf or dumb or both.

You could measure the difference of the amps in situ, in actual operation if you had a technical background as a foundation. I you want to, please drop a line to trigger a summary on the how to.

I am not taking new pictures every time I post something, lol.

 

[Heinrich]

I think I know why I don't like Fosi V3 mono compared to Topping LA90 discrete mono:
...
Look at that THD + N over 5Khz. Play it loud and it sounds... wrong. I still owe recording the same song on a couple different amps

I just realized something that feels almost forbidden: confirming people in their belief that something is better, even if the reasons are purely subjective. I don’t need to understand those reasons; I don’t care, and they’re not really communicable—what people feel is their own thing. But when it comes to dragging a really good standard through the mud, that’s a different matter.

So now you’ve got Topping—great, fantastic, honestly, keep them! But how exactly is it helpful to make me feel bad about my amplifiers? So, I feel bad, you do better.

*Sigh, yet another person who hears everything no one else has ever heard—and feels the need to tell the whole world because it’s so important.

 

[kidprofessor]

Last night I did something different.

First round of listening - NAD M51 -> FOSI V3 monos -> JBL ARRAY 1400

Bass is there but... it's not omnipresent, it's not engaging the room, resolution is okeish.

Second round of listening - NAD M51 -> Left channel TOPPING LA90 DISCRETE bridged -> Right channel FOSI V3 mono -> JBL ARRAY 1400

I've matched the levels so that the singer's voice was dead center as always.

Music was from the album We Cut the Night by AaRON, songs Ride On, Invisible Stains, We Cut the Night.

I highly recommend the album, those songs are great to check the resolution of the system, the soundstage...

Listen to them, you'll understand.

People, the bass, it was on a whole new level, whole room was full of the bass, it was part of the soundstage, not "something coming out of speakers."

The clarity went up, resolution, all those sounds you usually don't notice, they were back.

So, my bias is... what... only in the right ear but not in the left ear?

View attachment 479974View attachment 479975

The sound between the right to left speaker in this room will be significantly different because one is near a corner and the other is away from the corner. Additionally, there is a window on one side and a door on the other side. Even with perfect symmetry, there will be differences in the speaker low end response due to the materials differences in different parts of the wall. If you want to track down the problem, or hear differences, you would need to feed a mono file to each side and place the speakers right next to each other. I would suggest the left side, since it is away from the wall. The huge differences in bass response due to the room placement will also effect the perception of midrange and highs. I would also suggest testing each side of the Fosi with two speakers right next to each other with a mono file.

 

[Heinrich]

The sound between the right to left speaker in this room will be significantly different ...

... and the ears (two) too. The whole story is so funny, and also the healing. I have a great offer for you. Send me the top-notch Topping(s), and I'll take the diff between that and one of a V3 while playing connected to a real speaker. The diff is then digitally added to the source (file) and all people can decide if it makes a diference--when played through the better of the two. Deal? Not to forget the icing on the cake. We, you, could determine at which relative amplification, the severity of contamination so to say, the added diff would become objectional, or detectable even.

But I hear you, we had it so often. It is always the same. Some natural born listener, sorry, hears something sighted, which is existential (see initial post) and likewise entirely unexpected to everyone else. Things unheard of, drama galore. All cuddle the new teddybear to make it come alive, somehow. But, me thinks, it's a fruitless endevour.

At least we have a thread that kicks the V3s into the garbage can. Don't litter, guys ;-) Send them all to me. (And give me more snapshots of the nice home decor.)