If you like it, does it matter how it measures

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#83
TheGimp said:
I honestly expected them to sound the same considering how little power was used to drive the speakers, and the manufacturer of the receivers. I measured the power with my system when I had friends over for a gathering. Power level was such that one could carry on a conversation over the music. I listened to my sisters system much later, and it just didn't sound as good. It was a great disappointment to me. My expectation bias was such that they should have sounded identical.
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are you shure the different room or position of the loudspeakers had an influence?

Also same range amps can differ in inner design and can obviously sound different.

just hooking up the weaker amp to your chain could help decide.
 
#85
dadod said:
Here is an ClassA amp to be 10W on 8ohm, JLH 10W replacement. not so simple but without GNFB. Look the FFTs.
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Excellent information provided, but at only 10 watts, it doesn't really reflect 'real world listening applications'.
PS.
It is just my opinion, but to cover a broad range of speakers & music content, I have a general rule of 100 watts per channel,
and that being of high current capacity.
 
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#86
Depends upon speaker sensitivity. Use a 10 watt ACA amp with Tekton Double Impact speakers (98dB sensitivity) and they provide complete real world listening application.
Even better is an Aleph 30 amp -- with single-ended push-pull design. Considered by many to be Pass's greatest amp design.
 
#88
True but I find the tradeoff to be power versus purity. The more transistors, the less clarity. This is why the Aleph at 30-60 watts can be ideal. Single-ended but with enough power to handle speakers in the mid to high 80 dB range.
 
#91
Mister Audio said:
Excellent information provided, but at only 10 watts, it doesn't really reflect 'real world listening applications'.
PS.
It is just my opinion, but to cover a broad range of speakers & music content, I have a general rule of 100 watts per channel,
and that being of high current capacity.
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That was an answer to kgelee opinion abouth JLH 10W Class A amplifier.

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#92
@gabdx

please tell me more about tests with complex signals.

Me for my part as a loudspeaker aficionado I learned lately about the influence of amplifier topologies which can be quite obvious. I.e. for example how stiff a power supply is and what it does to the sound in practice.
 
#93
Freedom666 said:
for example how stiff a power supply is and what it does to the sound in practice.
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A "stiff power supply" really shows its advantage with music containing sustained 'energy content' such as Techno/Dubstep (for example).
A 'soft power supply' can deliver high transient power for a moment, but 'sags' upon anything sustained.
Another aspect of 'soft power supplies' is that they can't deliver double power @ 4 ohms VS 8 ohms >
This means that if you have speakers with high fluctuation of impedance, EG down to 4 ohms, you will encounter frequency response implications.
 
#97
kgrlee said:
Wanna post the circuit of this miracle device?
Can you post the link in another fashion? My browser says "not available".
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When it comes to audio amplifiers, I recommend differentiating and categorizing - analog amps:
Single ended,
PP,
complementary transistors PP,
half wave unbalanced complementary transistors pp.
This is a sufficiently precise categorization. Then consider the complexity, e.g. number of amplifying stages.
A distinction between A, A/B, B, C..., as taught in electrical engineering, is unsuitable in audio electrical engineering.
That's why the statement "wannabe Golden Pinnae Classe A" is basically a null statement here (for me).

This categorization has evolved over decades (but without DBLTs;-). I think I posted in this direction for the first time in this forum about 10 years ago - perhaps this forum is also a great opportunity for social analysis or psycho analysis, for example: discourse and interaction and language, negotiating terms, categories and such;-)

The circuit: no miracle device, but as simple as mentioned: half-wave asymmetrical complementary transistors pp, 2-stage. 1 psu, i.e. one voltage (not two psu: positive and negative) I don't need to write more precisely, as values are component-dependent. There is still something to say about the choice of transistors, because 9 out of 10 are audio unsuitable. As always, I recommend BD441, BD442, and perhaps a TO-92 2SA-2SC type, to start.
 
#98
Aside: the common statement "expectation bias" applies to everything and everyone. It is ergo a non-statement and only serves to avoid dealing with the development of complex methods of audio, sound assessment.
I recommend video as a start in audio: TV. Simply unplug, turn the plug 180 degrees and plug - if possible. Or leave out the extension cables. Or leave out the distributor. Or change the order of the devices in the distributor. And so on. What will be obvious to most people here in video is transferable to audio.
 
#99
The human brain often seems to prefer things that are not perfect.Like this music that is off pitch and often off rhythm but somehow just sounds great.Perhaps our brains are stimulated and enjoy a bit of a workout in filling the gaps and making sense of errors? And that makes it more musically engaging.
 
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#100
kgrlee said:
BTW, the JLH 10W Class A I tested used RCA TO-3 outputs. Can't remember whether these are supposed to have better clarity & definition than the later plastic devices 😲 Alas, my mains cables weren't hand carved from Unobtainium & solid BS by Virgins so my DBLTs are probably null & void :stop:
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TO-3 are among the worst-sounding transistors. This has to do with the housing and their connection: definition of current: of signal.
 
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