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fas42 fas42 is online now

diyAudio Member

About Me

  • About fas42
    Biography
    Probably worth mentioning I'm an EE, but life took me elsewhere after graduating ...
    Location
    NSW, Australia
    Interests
    Achieving totally convincing sound. As well as universal happiness, world peace, etc, etc ...
    Occupation
    Retired from the computing industry
    Country
    Australia
  • Signature
    Frank . . . everyone knows what a 'bad' recording is - it's one that doesn't sound good on their own, very special system ...

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  • Last Activity: Today 12:54 AM
  • Join Date: 19th June 2012

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View fas42's BlogRecent Entries
Latest Blog Entry

Posted 12th April 2014 at 02:40 AM by fas42 Comments 1
This will be a collection of ideas developed and experiences encountered in my personal foray into the world of audio. In part, this is to counter much of the negativity and beliefs out there about the limitations of bog-standard, vin ordinaire, reproduced sound from conventional recordings, heard via a normal pair of speakers.

First of all, the sound can get very, very, very good. Far beyond normal hifi, better than "live" much of the time ... so how can that be so? Because, typically for the recording session the positioning of the microphones, and acoustics, are optimised and tweaked by the sound engineers to pick up a "quality" well beyond what you as an ordinary audience member, concert goer, would experience.

So, how good? Well, for a start you can get "invisible" speakers, meaning that they can't be perceived as being the source of the sound; even if you go up to them and stare at them very closely, and move from side to side...

Posted 12th February 2014 at 04:10 AM by fas42 Comments 16
Posted in Tweaking
I mentioned in a thread a while ago about doing an exercise of engineering an amp capable of delivering 2k watts into a 1 ohm load, with distortion aiming at the magical ppm figure. This is still happening, and making progress ... key problem as I saw it was managing crossover distortion intelligently - I'm looking at a conventional class AB output stage at the moment - and it didn't make sense to try and control it using a classic global negative feedback approach.

By nature I'm an excellent scavenger, I look to see what ideas are already out there - so I'm trying out some concepts in using local negative feedback. This is evolving, step by step - and showing promise: in a simulation of the output stage only, getting effectively 2kW in 1R, at 200kHz with reasonable stability - and the waveform at this stressful frequency looks pretty good, there is still some crossover glitching, but I'm reducing the visible level of it steadily.

Posted 16th December 2013 at 05:23 AM by fas42 Comments 9
Posted in Uncategorized
Bummer!! After mentioning that Brad's (bcarso) units were doing very nicely I swapped CDs while they were set to max. volume, doing a good job on a classical piece. Unfortunately, the new disk was heavily compressed pop, my mind was elsewhere, and I hit the volume control a second too late - everything's OK except the right speaker has dropped about 6dB in volume, ...

I suspect that some protection circuitry has tripped, but it's not resetting. Which means, unless anyone has a good idea otherwise, that I'll have to dive inside and sort things out. But, on the other side of the equation that may be an excellent thing to do, it will give me a chance to do some more adventuresome tweaking ...

Trouble is, I'm lazy ...

Posted 23rd December 2012 at 03:07 AM by fas42 Comments 14
Posted in Audio Samples
As 'threatened' in a comment in abraxalito's blog I'm going to kick off posting and linking to some samples of sound generated by myself, at the moment examples of replay on my system, recorded using a very basic technique.

I'll probably regret it, but I'm going to put up a rough and ready trial run, to give a smell of what I'm aiming at. It's full of problems, but it gives some good indicators of what I'm dealing with, and hopefully some feedback will help me for future runs.

The system is my 'dud' HT all-in-one setup, heavily tweaked, and the recording device is a Fujifilm S4000 camera, which does HD video rather nicely, with mono 44.1/16 audio thrown in - that's handy. To maximise sound quality and minimise card storage used, hopefully, the lens was covered while recording, yes, no pics! Unfortunately, signal to noise is poor and the automatic volume control keeps falling over its feet, but you can't get everything for that sort of money ...

...

Posted 22nd October 2012 at 09:58 PM by fas42 Comments 2
Posted in Uncategorized
Well, as mentioned elsewhere checked out the first proper show we've had in decades, and in hindsight it has been a very worthwhile, educational experience. Not because I heard magic audio I've never heard before, but, because I then browsed a collection of other people's thoughts and takes on the various sounds heard at the event, on another, Australian, audio forum.

Which showed me that people are in very different spaces, as regards to what is considered, "proper sound". Obvious of course, but it still throws one, makes one question one's ideas and thinking on matters ... for a split second, at least ...

My personal take on the show is that there has been a very discernable improvement in the standard, or average, quality of sound of a normally assembled system which has had only a minimal amount of tweaking applied to optimise it. Problems that were obvious in previous such efforts were far less apparent, you didn't want to run screaming from...
Recent Comments
Obviously, I am a little...
Posted 12th April 2014 at 05:18 AM by fas42 fas42 is online now
A thought - the chip...
Posted 11th April 2014 at 10:44 PM by fas42 fas42 is online now
Some interesting behaviour...
Posted 8th April 2014 at 06:01 AM by fas42 fas42 is online now
Well, I'm rather pleased...
Posted 3rd April 2014 at 02:28 AM by fas42 fas42 is online now
Bizarrely, what's catching...
Posted 26th March 2014 at 04:19 AM by fas42 fas42 is online now
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