Sound Quality Vs. Measurements - Page 72 - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th January 2012, 09:52 PM   #711
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
If everyone here would just do a bit of 'Data mining' with what we have already found with amplifier and speaker design, it would me much less confusing.
  Reply With Quote
Old 9th January 2012, 09:52 PM   #712
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Yes, a nice envelope would probably provide a nice pretty test. I am looking for something that causes a difference and to see if it correlates to the subjective test. Something extraordinary, a stress test if you will. All the nice "reasonable" tests I know of don't show anything different. Hey, I could be so far off in left field I am totally lost. I did see a difference. Relevant? Don't know. Just a difference.

If I can reliably reproduce the difference, than I can hypothize what parameters could be driving it and change that in an amp to see if it correlates to the subjective test. I suspect making a "good" amp bad is easier than making a bad amp good. Only then can I draw a conclusion with enough substance to have others reproduce the experiment and draw their own conclusions.

Tangent thought. You may have noticed I have them. We all know the original Fletcher-Munson experiments and how those evolved into the ISO standard for relative loudness. What I have never seen is the deviation across the tested population. We "know" the fair gender hears higher frequencies and likely the critical 4K range with greater sensitivity that we do. By how much? All I can find is the normalized curves. Has anyone seen the data correlated to differences in the population? Has anyone done any measurements on brain activity to determine if there is a difference in what we detect, and what we process as sound? I my not be using the best search terms.
  Reply With Quote
Old 9th January 2012, 09:59 PM   #713
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
benb,
Data mining is old school. We have been doing it with data warehouse products like IQ for a long time. Where it gets interesting is when we shift to big data. THAT is something I actually do know a bit about. Multi-petabyte is one thing, but doing sliding window analysis on data bigger than can fit in memory for near real time analysis gets fun.
  Reply With Quote
Old 9th January 2012, 10:05 PM   #714
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
P6302's seem out of my price range. Anyone have suggestions on current probes with a more limited bandwidth? I have been out of the lab so long I don't know what is out there. They were really expensive back then. I guess I could just rig a hall effect transistor to a op-amp or something to give relative difference measurements. Butcher an old Bosch ignition module maybe?
  Reply With Quote
Old 9th January 2012, 10:14 PM   #715
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
[venting]Why does this discussion remind me of the metaphor of 'the blind men and the elephant'

I'm so glad the micro analysis of topologies is over...whew. When I set up a system for live performances. You know, the ones you like to recreate in a bedroom then complain about the timber of the drivers being wrong. It takes a long time to learn how to tune a room. If the amps are good enough*, then I say "good, next problem". (problems mostly created by architects, grrr) btw, I hate large hanging panels and Jumbotrons. Thanks for the large sonically reflective surface, .

*(btw, my definition of "good enough", is stunningly transparent, crowd pleasing and very very clean)

can you tell what I did today...

Tuning the room takes much more effort and makes much more of a difference than tweaking the output of the HF drivers or adding a soft filter and a notch filter to kill a standing resonance.

I wonder why designers get sucked into the minuta trap. ie. it could be .00000002% better if I just changed this resistor... why, it's good enough. I guess it would take a renaissance man to stop designing the amp and move on to design the drivers, cabinets and room. Well that and you can't sell the whole system just most of it.

I need a beer.
[/venting]

Sorry guys, I needed to get that out.
cheers,
revb.
  Reply With Quote
Old 9th January 2012, 10:21 PM   #716
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
Tvrgeek,

just a thought, have you tried taking one of the amp speaker combinations that your wife likes and moving it somewhere else. Say, outside, or in a bathroom or unfinished basement?

I wonder if it's the amp-driver or the amp-driver-room-number of people in the room- humidity level-time of day-etc etc.. you get my drift.
  Reply With Quote
Old 9th January 2012, 10:30 PM   #717
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Revb;

after tuning the room to sound how can you use it for taking a shower?
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 9th January 2012, 10:46 PM   #718
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Quote:
Originally Posted by revboden View Post
Tvrgeek,

just a thought, have you tried taking one of the amp speaker combinations that your wife likes and moving it somewhere else. Say, outside, or in a bathroom or unfinished basement?

I wonder if it's the amp-driver or the amp-driver-room-number of people in the room- humidity level-time of day-etc etc.. you get my drift.
Yup. It seems independent of the room. She does appreciate the tuning I have done in some of our rooms. I can't say enough about what large absorbers can do for imaging when behind the speakers, all of what I have done for the bass and so on. That seems independent of the harshness she hears. I would agree with the comment room tuning is a lot harder than system tuning. Doing it in a room and making it look not dominated by the sound system is even more of a trick. We try and keep our living room looking like a living room.
  Reply With Quote
Old 9th January 2012, 10:47 PM   #719
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
I need a refill.
  Reply With Quote
Old 9th January 2012, 10:58 PM   #720
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
If the singer has say sour throat it is room independent. He / she would sound as having a sour throat even in bathroom. So it is room independent.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Quality Control differences = variations in sound quality? KT Class D 3 4th June 2014 12:02 AM
Sound Card for Measurements Marik Solid State 2 2nd January 2012 08:59 PM
Sound Card Recommendations (For Audio Measurements) dchisholm Equipment & Tools 5 16th July 2011 09:40 AM
How to protect sound card during amp measurements? okapi Everything Else 13 2nd September 2008 03:06 PM
Sound cards - test and measurements jackinnj Everything Else 2 5th July 2003 03:02 PM


New To Site? Need Help?

All times are GMT. The time now is 07:40 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2