Pass ACA Class A Power Amplifier Review

[Observer]

No, an e

un

so you say the pass labs ACA with all that distortion sounds like your real guitar ? What speakers do you use to replicate the effect ?

No, an e

un

so you say the pass labs ACA with all that distortion sounds like your real guitar ? What speakers do you use to replicate the effect ?

You take my answers from the contekst , I don't use ACA amp if you read carefully you should know that.

 

[Observer]

If there is class A And class D Which measures same, both should sound same.

No, they won't.

 

[Objectivist01]

No, they won't.

Why?

 

[Observer]

Why?

Maybe because they are different

 

[Objectivist01]

Maybe because they are different

How are two amps with same measurements different ?

 

[Observer]

How are two amps with same measurements different ?

Sorry, I can't help you. I will just quote a member who was longer here than me:
"this forum is not a very good place for any discussion which veers even a bit from its dogma"

 

[Koeitje]

I can't help you, so I will just quote a member who was longer here than me:
"this forum is not a very good place for any discussion which veers even a bit from its dogma"

We aren't veering from a dogma here, we are simply asking you to identify what would make it sound different. Not because we want to argue about it, but if we know what it is we can start measuring it and use it to compare amplifiers.

 

[anmpr1]

OK. I'm obviously an idiot. You win.

It's not a question of idiocy. At least at first. It's a question of learning, and changing one's opinion to fit the facts. The idiot part only arises when one is faced with facts and chooses to deny the facts. Also, there is no disgrace in changing ones views. My guess is that most folks here at one time or another believed in some sort of audio-foolery. Then, over time, we changed as we became more sophisticated and knowledgeable in our audio hobby.

Note: the fact that audible differences between gear (other than speakers or other electro-mechanical devices) have been shown to be mostly chimerical, that does not mean one cannot or should not own what they like. Even if it is strictly cosmetic. It does not mean that, say, a Behringer negates the reason for owning an Accuphase.

 

[anmpr1]

I am playing guitar... so I know "sound of live music".

Is that with our without the distortion pedal and a lot of overdrive?

PRS, Epi Dot, and not sure the Strat clone? Nice.

The only thing that is weirder and more controversial than the world of high-end audio is the world of electric guitars.

 

[Objectivist01]

Sorry, I can't help you. I will just quote a member who was longer here than me:
"this forum is not a very good place for any discussion which veers even a bit from its dogma"

That’s an easy way out when you cannot prove your point.

 

[Observer]

Is that with our without the distortion pedal and a lot of overdrive?

PRS, Epi Dot, and not sure the Strat clone? Nice.

The only thing that is weirder and more controversial than the world of high-end audio is the world of electric guitars.

It could be as you said, I am not sure.
Epi is 339, Strat is Am Standard. I use Trex reverb and Ibanez delay, overdrive is from amps dirty chanell.
Thanx

 

[Observer]

We aren't veering from a dogma here, we are simply asking you to identify what would make it sound different. Not because we want to argue about it, but if we know what it is we can start measuring it and use it to compare amplifiers.

Maybe you are not, but some unfortunately are ...

 

[Objectivist01]

Maybe you are not, but some unfortunately are ...

What makes you feel so? Is it because they are not agreeing to your bias which isn’t backed up with any parameters ?

 

[anmpr1]

So what, this amp should still be fine at 50W.

This is a big subject and has been debated endlessly. Rule of thumb: If your loudspeakers can play loudly with minimal distortion your amplifier can be huge. Literally thousands of watts. You'll tend to play things loudly because of the low overall system distortion.

If your loudspeakers distort badly when played louder, you can get by with a low powered amplifier because you won't want to listen at the higher levels. It is your loudspeaker's distortion that will make you turn it down.

Below links to a highly readable article explaining some of this:

http://www.audioheritage.org/html/perspectives/drews-clues/audiophile.htm

 

[Lorenzo74]

I am playing guitar, I was in the band until my back pain stop that so I know "sound of live music".
Still I play when I can, and I got my guitars (photo in attach)

one of the best reply regardless who’s right...

 

[Objectivist01]

one of the best reply regardless who’s right...

I too agree to that. like something from a classic novel or movie.

 

[Observer]

What makes you feel so? Is it because they are not agreeing to your bias which isn’t backed up with any parameters ?

I know and I can explain things which can influence sound, and I can demo that in listening room .. my wife or neighbour can hear difference with no problem. How can I prove it here on forum, where most of you believe in just one thing"measurment report". It is waste of time.

 

[SIY]

Please stop jumping on my replys which are not replied to you, be nice.
I know and I can explain things which can influence sound, and I can demo that in listening room .. my wife or neighbour can hear difference with no problem. How can I prove it here on forum, where most of you believe in just one thing"measurment report". It is waste of time.

Was your wife in the kitchen? That's usually how it works.

In all seriousness, if you don't compare things ears-only (and that means NO peeking, double blind, level matched), your assertions have no evidentiary weight. That's why you're taking flak, you haven't even done the most basic controls.

If you have to peek to hear the difference, you can't actually hear the difference.

 

[Objectivist01]

Please stop jumping on my replys which are not replayed to you, be nice.
I know and I can explain things which can influence sound, and I can demo that in listening room .. my wife or neighbour can hear difference with no problem. How can I prove it here on forum, where most of you believe in just one thing"measurment report". It is waste of time.

Dude you are talking about a totally different thing.
Yes you have two amps say a class A and class AB and you may subjectively find one of them superior to the other.

All we are saying is if you measure both of them, they both would be different in terms of THD pattern, SNR wattage and so on. But if you had two amps from a brand A and brand B , having same measurements, they should sound the same. So, if you know what do you strive to achieve from your system, you can look at the measurements and decide your purchase.

all I asked was what was that parameter which I have to look for differentiating a class a and class d amp to have different sound but same measurements. You simply said they sound different and nothing to substantiate what you said.

 

[BDWoody]

Please stop jumping on my replys which are not replied to you, be nice.
I know and I can explain things which can influence sound, and I can demo that in listening room .. my wife or neighbour can hear difference with no problem. How can I prove it here on forum, where most of you believe in just one thing"measurment report". It is waste of time.

This is a public forum, so all replies should be considered fair game...

'We' generally are going to ask for more than 'because I say so' here...as opposed to most audio forums where it is almost a competition to see who can hear the most unlikely things from the most unlikely elements (cable risers...audiophool digital cables...stupid high sample rates, etc), put into the most flowery/pornographic prose that can be created.

So far, no one has been able to back up any of it with anything other than more passion.

If you haven't ever gone through the (fairly substantial) hassle of setting up and completing a true level matched double blind test, it may teach you more than the decades of listening and playing you have clearly done.

It changes everything...