It should be noted that phase shift, however, is something which exists only in the frequency domain, because it is the rate of change of phase with frequency. In the time domain we should speak of the phase slope, which gives rise to the phase distortion that changes the waveform. In general, it is desirable for a good monitor amplifier to have a flat amplitude/frequency response between around 5 Hz and 80 kHz – two octaves either side of the audible frequency range – if good transient responses are to be expected.
Now it becomes very obvious that you heard the bell ring but don’t now exactly where the clapper is hanging. Please read some books on the phase subject.
What you try say is that an amplifier including load should have a group delay within a certain time band from 5Hz to 80kHz.
IMO it makes more sense to go from 20Hz to 20kHz with an even tighter time band.
Hans
Immediately provide this information to meneer Van den Hul. I really hope he appreciates it a lot more than I do.
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Dont you mean "wire most certainly being the most passive component"?
Maybe it's solder. That stuff that electrically bridges even shorter distances. Of course, they say that makes a difference too. There's no limit to how far one could "drill down" into this stuff.
I'll always remember the statement I once read long ago, something like "I know what you must be thinking; C'mon Walt - get a life - but it really does sound better"
Listening to reproduced music must be like getting a good nights sleep - you can toss and turn over all the infinitesmals - or at some reasonable point you can let it all go and just do what the bodily senses/brain do naturally; enjoy.
I see a pair of cornu spirals hanging on the wall in Bill's future. In car audio, I always wondered how they can say the soundstage extends out over the front bonnet when there's a solid windshield in the way, but maybe it can be made to happen.
!!CAUTION!! RHC Ahead!
In the late 1980's Richard Clark purchased the old Speakerworks Buick GN, and then in one of the first projects I ever did with him, he and I designed a car system with new 15x45° custom laid-up horns into Buick Grand National:
I remember the drivers were Altec, but I forget the p/n, maybe Ed can tell?
The 2" drivers were actually located in a wheelwell bump-out in order to get maximum throat length for lowest cutoff frequency. Still the pattern was poor (for a proper horn) but created much better imaging than any other car with tweeters and mids positioned anywhere around the dashboard or front doors. The soundstage did indeed extend past the dash/windshield...
The car had the two horns, two mids in the rear side panels, two woofers behind the gutted rear seats and close to 1KW of amp and was chock full of pro-sound gear (delays to align driver arrivals, eqs...)since that was the world we both came from. Just about the only car audio gear in it was the Alpine head unit (edit - and amps). It was almost pure stock looking inside other than the matching fabric horn grills. We removed the front panel from a Delco CD player and motorized it to fold back and reveal an Alpine head unit behind it and a ton of other new technology for the time...and started winning every single IASCA show we brought it to, and in the process redefined what sound quality in a car could be.......but this is going long.
Cheers!
Howie
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Are mark romex cables still manufactured? Very little information on the Internet. I wonder if these guys accidentally chose him or not?
Romex is solid copper wire used for 120 VAC power wiring in the walls of houses. See pic below.
Attachments
Blauert & Laws in 1978 have composed a table for our hearing
treshold for group delay deviation.
At 2Khz we are most sensitive with ca. 1 msec.
At 500 Hz it is 3.2 msec and at 8 kHz 2 msec.
For 20 Hz I’ve seen figures of 12 msec.
So this is the maximum allowable time band around the group delay.
If you want to go to extreme, which is not at all that difficult to achieve, you could specify a time band of +/- 0.25 msec around the group delay from 20Hz to 20 kHz, well within the most sensitive point at 2 kHz.
I think that most modern amplifiers meet this with ease.
Hans
Even for five conductors there is an application.
https://lh4.googleusercontent.com/4...cxGlpWbtrmj-IacxgahgieNLx7lJxUg8txaBVZb4IyWm6
I saw this, but did not find their site. It looks like the company name has changed to Southwire’s. Romex 63949232 50 ft. 8/3 Black Stranded CU SIMpull NM-B Wire - Electrical Wires - Amazon.com
Southwire.com | Homepage
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We used Romex for power distribution in home construction... our home. Unless we used BX armored cable.
Professionally we specified individual solid copper conductors with XLPE (cross linked polyethylene) insulation in rigid conduit.
Professionally we specified individual solid copper conductors with XLPE (cross linked polyethylene) insulation in rigid conduit.
Gunfu,
The comment regarding 6" of Romex was something I have heard before from other people. Don't know if it started with Nelson Pass? Anyway, the point is that 6" of reasonably good quality #12 gauge solid copper wire (nothing more special than someone would use to wire a house) makes a very good speaker wire because of its short 6" length and its simple construction. However, that's not to say that longer lengths of Romex would work as well for speaker use, they probably wouldn't.
My comment was in response to a question about how can one know what makes speaker cable good or bad. Well, 6" of solid copper heavy gauge speaker wire probably isn't going affect sound quality at all, and it would make sense that should be the goal for longer speaker wires too. Thus, the question I was responding to was answered in a sort-of round about way.
The comment regarding 6" of Romex was something I have heard before from other people. Don't know if it started with Nelson Pass? Anyway, the point is that 6" of reasonably good quality #12 gauge solid copper wire (nothing more special than someone would use to wire a house) makes a very good speaker wire because of its short 6" length and its simple construction. However, that's not to say that longer lengths of Romex would work as well for speaker use, they probably wouldn't.
My comment was in response to a question about how can one know what makes speaker cable good or bad. Well, 6" of solid copper heavy gauge speaker wire probably isn't going affect sound quality at all, and it would make sense that should be the goal for longer speaker wires too. Thus, the question I was responding to was answered in a sort-of round about way.
I'm sure we all recall that published hearing thresholds are not absolute limits, but rather they are estimates of the average limit for a population. That is to say, 50% of the people in the population would not be expected to hear an affect at that level, and the other 50% of people would still be able to hear an effect. To assure that almost nobody would be expected to hear the effect it might reasonable to use a specification, say, 10 times lower than the average limit. Thus, using 25% of the published limit might not rise of the level of being 'extreme,' perhaps merely prudent.