John Curl's Blowtorch preamplifier part III

[Tournesol]

Then your "noticeable improvement" remains your preference and we will never know what the differences were. So, no benefit, and no loss, your comment can be ignored.

Its audio, guy.

Make your "own preference" by listening. My comment has only the interest to point your attention on some details about sound characters.

Now, if your question was about "what the differences are" (subjective), i can answer. Less grainy sound, more focused or detailed and better instant dynamic with film caps. I tried various film caps too, the differences were not so obvious (or determinant) to my ears: I'm not snobbish or an audiophile blind believer. Soi I choose good quality/price industrial ones. I will never even try esoteric over priced ones.

 

[scottjoplin]

Agreed for mixing/mastering near field is best,

But more than some people are stuck with their listening room the way it is, making that room sound ‘live’ @ LP is the ticket.

Edit......and actually not a bad idea to listen to the same recording in a studio monitor configuration before tackling the room. Good job!

I understand it's not practical for most people, but we were talking about accurate 😉 Constant directivity speakers still seem like a largely overlooked prerequisite to me though.

 

[mountainman bob]

My new build is a 10” mtm w/ b&c de250 in a seos 10 - 2 eminence delta 10”
Over lab 15 modules.

Ought to get me there!

Edit.....got all the pieces in the closet, coming soon; spring 2020!

 

[Tournesol]

Richard showed his method for accurate, and others showed it has many flaws, so, in many ways the question still remains. Ultimately how you decide whether something is accurate is subjective in itself, fun watching people try though.

I don't thing Walter & Richard were trying to establish a scientific discovery on the laws of physic in action, here. Just trying to find some correlation of listening experiences reported by many people with the usual available measuring procedures, to see if any correlation could be found.
Correctly driven or not, the presence or absence of results in this measuring work do not affect the reality (or absence) of the listening differences reported by several people that seems to make-you uncomfortable with.
It would be pretentious to pretend that we know everything and know how to measure everything.

 

[scottjoplin]

You make a lot of incorrect personal assumptions about members here, please put me back on your ignore list.

 

[scottjoplin]

My new build is a 10” mtm w/ b&c de250 in a seos 10 - 2 eminence delta 10”
Over lab 15 modules.

It sounds interesting, but can I have an English translation please? 😉🙂

 

[Tournesol]

Constant directivity speakers still seem like a largely overlooked prerequisite to me though.

Constant directivity is not the goal and i don't know any speaker able to achieve this. It is about no accident in the directivity curves that have the same influence than accident in the response curve in axis.

 

[Tournesol]

You make a lot of personal assumptions about members here.

Do-you mean about "egos" ?

 

[mountainman bob]

This

Denovo Audio Cinema-10

On top of these

Eminence Buyout 15" subwoofer

 

[scottjoplin]

T, I think you just want to argue, carry on without.

Thank you Bob

Nice 😀

 

[Tournesol]

T, I think you just want to argue

Not at all.
Just I try to think simple (is beautiful).
About tis cap sound question, I noticed some differences, chosen what was working better (for me), end of questions. What the hell ?
Tried to share my experience, it is like to share a good restaurant address. Nobody is obliged, and I don't sell anything ....

 

[scottjoplin]

A great post here from Earl Geddes https://www.diyaudio.com/forums/subwoofers/134568-multiple-subs-geddes-approach-199.html#post6008920

 

[scottjoplin]

Not at all.
Just I try to think simple (is beautiful).

Ok, I ment about your CD speakers post (mainly) and if you like simple (in some ways) what about dipole?

 

[Tournesol]

Ok, I ment about your CD speakers post (mainly) and if you like simple (in some ways) what about dipole?

Do-you mean this ?

 

[scottjoplin]

Even better without the baffle In Pursuit of a 20-20k Dipole Loudspeaker

 

[Tournesol]

Even better without the baffle In Pursuit of a 20-20k Dipole Loudspeaker

Don't it seems the opposite of what I'm looking for ?

 

[scottjoplin]

I'm posting it as an example of a CD speaker, there are many others and plenty of explanations, if you are interested, in why they are a good goal.

 

[vacuphile]

In attached picture You can see "distortion" caused by elyt coupling caps at input and in feedback arm in my amp. 28V RMS output (so quite full voltage swing), no load at output. So no output stage distortions.

Impressive! Into what load?

 

[gpauk]

My new build is a 10” mtm w/ b&c de250 in a seos 10 - 2 eminence delta 10”
Over lab 15 modules.

Seriously consider bi- or tri- amping. Get rid of speaker cables and power crossovers. They are always riddled with compromises...

 

[Tournesol]

A great post here from Earl Geddes https://www.diyaudio.com/forums/subwoofers/134568-multiple-subs-geddes-approach-199.html#post6008920

I don't fully agree with all says Earl Geddes.
Subjective assessments have a value depending on the knowledge and serious of the guy that report them.
They need to be verified by yourself to see if it correlate with your own experience.
Addressing a flaw need a correct scientific analysis to know the right direction to take.
Again, I'm not a believer, neither na audiophile, neither a pure objectivist.
My horns are spherical waves based. Before any publication of Le Clea'ch.
The idea was not mine, the choice based on what I heard.
I prefer the JBL M2 to the Earl Geddes NS15. There are many roads that drive-you to Rome.