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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old 7th June 2018, 11:21 PM   #5101
billshurv is online now billshurv  United Kingdom
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John Curl's Blowtorch preamplifier part III
And of course this landmark ruling
https://www.bbc.co.uk/news/entertainment-arts-43571144
Quote:
any more questions or contributions on CD or near field or lower distortion from drivers

Nope. You can't be bothered to read the labels on the graphs and just want to repeat your opinions rather than go off and look at the incredibly impressive work members here are doing to come up with better speakers so I'm done with that.
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Old 7th June 2018, 11:41 PM   #5102
RNMarsh is offline RNMarsh  United States
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Any one know anything... not opinion... about ac power conditioners and if they make an audible improvement = more accurate sound ??


THx-RNMarsh
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Old 7th June 2018, 11:44 PM   #5103
RNMarsh is offline RNMarsh  United States
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Originally Posted by billshurv View Post
Ed I am sure has some proper measurements with calibrated gear, but still has no bearing on what gets recorded, mastered and released for us to replay.
I am sure you can find what ever you need to know on Google. Professional info on SLP of live performances are all there. or your prof society to your hearts content.


-RM
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Old 7th June 2018, 11:46 PM   #5104
RNMarsh is offline RNMarsh  United States
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Originally Posted by billshurv View Post
And of course this landmark ruling
https://www.bbc.co.uk/news/entertainment-arts-43571144



Nope. You can't be bothered to read the labels on the graphs and just want to repeat your opinions rather than go off and look at the incredibly impressive work members here are doing to come up with better speakers so I'm done with that.
hahahaha pretty selective of you.... 130 db !!! Yeah that will make them deaf!


-RM
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Old 8th June 2018, 01:54 AM   #5105
Markw4 is offline Markw4  United States
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Originally Posted by RNMarsh View Post
Any one know anything... not opinion... about ac power conditioners and if they make an audible improvement = more accurate sound ??


THx-RNMarsh
Only opinion here, no measurements or other objective data. Opinion recently updated though.
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Old 8th June 2018, 04:27 AM   #5106
RNMarsh is offline RNMarsh  United States
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Originally Posted by Markw4 View Post
Only opinion here, no measurements or other objective data. Opinion recently updated though.
Then, I found a 1KVA ultra-isolation Xfmer in the garage to use on your PA. See what that does.


-Richard

Last edited by RNMarsh; 8th June 2018 at 04:31 AM.
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Old 8th June 2018, 04:48 AM   #5107
dadod is offline dadod  Croatia
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Originally Posted by RNMarsh View Post
No, I have not.
I've sent email and PM.
I'll send PM again with the address.
BR Damir
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Old 8th June 2018, 06:06 AM   #5108
RNMarsh is offline RNMarsh  United States
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I got it... multi-tasking like crazy right now. I'll get them to you.

-RM
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Old 8th June 2018, 07:31 AM   #5109
Markw4 is offline Markw4  United States
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Originally Posted by RNMarsh View Post
Then, I found a 1KVA ultra-isolation Xfmer in the garage to use on your PA. See what that does.
Right. Richard loaned me a prototype power conditioner to try out. Decided to try it with the Benchmark DAC-3. Played some music to refresh my memory then went looking for the DAC-3 power cord in the back of the equipment shelf. Turns out both the DAC-3 and AHB2 were furnished with very thick power cords, much thicker than necessary for the DAC certainly. Both cords feel like they might have shielding in them.

Plugged the DAC into the power conditioner and yes, there was a difference. Some harshness in the NS-10 tweeters that I had always attributed to NS-10 harsh tweeter lore was gone. Found the slotted tissue paper I had put over the tweeters was no longer needed or desirable.

Needless to say, I was very surprised, as I was not expecting any change at all. That being said there wasn't a huge problem with the tweeters before, and having it gone or reduced was not a large effect. It was still clearly an effect, and for the better.

Having been firmly in the 'if it needs a power conditioner there is a design fault with the device' camp and a 'power cord difference' disbeliever, I am still kind of trying to sort out why not even Benchmark can make a bullet-proof power supply. (I didn't change the power cord, to be clear, I am just questioning some of my old beliefs based the difference I heard with the conditioner.)

So, I have decided to try one of the big power conditioners Richard designed for Monster. Found a used one on Ebay. When it gets here we will see if any other change with the AHB2 and computer all on power conditioner circuits (each duplex socket is individually filtered with respect to the other conditioner AC output sockets).

Also, while at Richard's he showed me some pics of spectrum analyzer captures he took of power line noise when he was working on power conditioner development. If anyone is interested in seeing them maybe he would be willing to share, don't know.

EDIT: Richard also loaned me a little box he built to monitor AC power with a scope, or presumably with a spectrum analyzer. It has common and differential mode BNC connectors. Haven't tried it yet, but will.

Last edited by Markw4; 8th June 2018 at 07:57 AM.
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Old 8th June 2018, 08:07 AM   #5110
Jakob2 is offline Jakob2  Germany
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Jakob, what is your take on the soundwheel?
http://assets.madebydelta.com/docs/s...f_audio_UK.pdf
Good approach, id say - not that surprising due to the people working there - and therefore considering a lot of aspects that are in forum discussions routinely dismissed as "excuses"


Quote:
I feel this is a step in the right direction, although without relevant training materials we are back to square one. Maybe that is something we can work on in this forum, as in producing samples that people can use to re-wire a few synapses?
What the deltalab does is similar to the EBU approach -although that was related to the evaluation of music, but that is in a technical sense a very similar task - that ive linked in the past:

EBU Technology & Innovation - Assessment Methods for the Quality of Sound Material - Music
Assessment methods for the subjective evaluation
of the quality of sound programme material – Music

The EBU provided sound examples as reference material for the synchronization needed (SQAM):

EBU Technology & Innovation - Sound Quality Assessment Material recordings for subjective tests

Sound Quality Assessment Material recordings for subjective tests

available for download (information about the material as well)
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