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Post by Boomzilla on Nov 8, 2024 15:36:55 GMT -5
HIDDEN JAZZ UPDATE LIST AS OF 11/8/24 (Supplements the list shown in this post: emotivalounge.proboards.com/post/1131496Kunzel – Cincinnati Pops King James Version Kim Pinsyl Kenny Gill Keep it Rollin’ Kala Dunn Jump, Jive, & Swing Jon Hendriks John Coltrane Joe Dippletto Usher Speakers Demo Disc Jimmy Smith Jessy J. Jerry Mulligan Jeff Golub Jazznocracy Anything with “Jazz” in the folder title James 12” Andrews Jambalaya Jaco Pastorius J.J. Johnson Irving Berlin In the Mood for Swing – Benny Carter I Guess We Didn’t Save The LP Howard Hanger More to come...
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Post by leonski on Nov 9, 2024 13:30:06 GMT -5
Keith?
A JOKE that goes back in time. Gates was a pirate. Just getting DOS was a deal. Writer of that original code got peanuts.
And Jobs was always the eccentric 'man of the people'....sort of.
So Gates was the one you loved to hate, while jobs and his computers got sort of a pass......
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Post by Boomzilla on Nov 9, 2024 19:12:38 GMT -5
Try THIS one out - one of my faves...
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Post by Boomzilla on Nov 13, 2024 9:26:21 GMT -5
I get the craziest things! This photo is of a gent who put FOUR Advent speaker drivers in each box (plus a midrange - and maybe a supertweeter?). He's planning to use Mini-DSP to make them all flat and phase-coherent. I wonder how it'll sound? Reminds me of Legacy speaker designs... |
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KeithL
Administrator 
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Post by KeithL on Nov 13, 2024 12:34:44 GMT -5
I had Advents back in the day... It was pretty common to set up Advent "Largers" (the regular original Advent Loudspeaker... aka Big Advents) as "Double Advents"... To do this you put a second pair on top of the first pair, with the tweeters toward the bottom on the top pair, so the tweeters were close together... This seemed to improve the midrange and high frequency response significantly... HOWEVER, to be fair, Advents had their limitations and issues - at least by modern standards. Their strong point was exceptional bass... which went really low and was REALLY powerful... and they could handle a LOT of power. But their "ring-plus-dome" tweeter-midrange didn't have great high frequency response. And, for another thing, they were always a big lacking in midrange clarity. I'm also seeing some rebuilt parts here... For example the woofers are not original for the Big Advent. The Big Advents originally had a ten inch woofer in a twelve inch basket... There was a one-inch wide masonite (fiberboard) ring that took up the extra space between them... This gave the woofer extra travel. Some of his woofers have the "concrete center cap" which the original Smaller Advents used (it was papier mache - and was there for added mass)... But some seem to be a different part... And the tweeters seem to be the newer black ones rather than the original "orange peel" version... Also the foam surrounds on pretty much ALL of the original woofers have since disintegrated and been replaced... I get the craziest things! This photo is of a gent who put FOUR Advent speaker drivers in each box (plus a midrange - and maybe a supertweeter?). He's planning to use Mini-DSP to make them all flat and phase-coherent. I wonder how it'll sound? Reminds me of Legacy speaker designs... |
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Post by marcl on Nov 13, 2024 13:26:01 GMT -5
I had Advents back in the day... It was pretty common to set up Advent "Largers" (the regular original Advent Loudspeaker... aka Big Advents) as "Double Advents"... To do this you put a second pair on top of the first pair, with the tweeters toward the bottom on the top pair, so the tweeters were close together... This seemed to improve the midrange and high frequency response significantly... HOWEVER, to be fair, Advents had their limitations and issues - at least by modern standards. Their strong point was exceptional bass... which went really low and was REALLY powerful... and they could handle a LOT of power. But their "ring-plus-dome" tweeter-midrange didn't have great high frequency response. And, for another thing, they were always a big lacking in midrange clarity. I'm also seeing some rebuilt parts here... For example the woofers are not original for the Big Advent. The Big Advents originally had a ten inch woofer in a twelve inch basket... There was a one-inch wide masonite (fiberboard) ring that took up the extra space between them... This gave the woofer extra travel. Some of his woofers have the "concrete center cap" which the original Smaller Advents used (it was papier mache - and was there for added mass)... But some seem to be a different part... And the tweeters seem to be the newer black ones rather than the original "orange peel" version... Also the foam surrounds on pretty much ALL of the original woofers have since disintegrated and been replaced... I get the craziest things! This photo is of a gent who put FOUR Advent speaker drivers in each box (plus a midrange - and maybe a supertweeter?). He's planning to use Mini-DSP to make them all flat and phase-coherent. I wonder how it'll sound? Reminds me of Legacy speaker designs... Here's how my Smallers measured after I redid the foam on the woofer. Original tweeter. Room resonances at 40 and 60, but look at them go down to 20! And smooth on the high end too. Bought them 1982. Nephew is enjoying them now.  |
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Post by leonski on Nov 13, 2024 14:03:14 GMT -5
You know, Keith? 'Stacking' worked for others than the original Advent.
My buddy and I EACH had a pair of RSL 12" / 3-way copies of JBL 4311 speakers.....right down to the mid / tweet level adjust.
We brought BOTH pair to a party and stacked 'em up......And used my Kenwood KA7100 to drive 'em both. No problem and that setup would
play Party Eviction LOUD.....Helps, I suppose that these speaekrs were fairly sensitive so we got a lot of Bang=Per-Watt.....
RSL was a SoCal 'boutique' builder many years ago. Owner maybe 4 or 5 named outlets. Sales guys were NOT on commission so less urge
to sell you stuff you didn't need. The origianl owner bought the name back and sells online these days.
But I'd still like a pristine set of Speed Screens
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Post by leonski on Nov 15, 2024 1:57:20 GMT -5
Auto News:
Aptera, which is ever nearer to shipping cars has made a very important change, which seems to have been allowed for in the
original drawings.
Also advertised since day ONE were 'wheel motors' Each wheel contains motor, drive, brakes and suspension.......So no traditional
driveline. But the company making the hub motors has not kept up. So the folks at Aptera made an amazing PIVOT.
They bought a motor by Vitesco...the EMR-3 which is in semi-wide use in the EV industry. Excellent specs which actually exceed
the total of the wheel motors AND less weight. And a LOT less 'unsprung' weight whichis the enemy of handling....Centralizing the
weight also helps a lot. Of course? No 3rd wheel powered option for now..... With simplified wiring, I hope the range / efficiency
is still there. The motor is highly unitized and compact. 150kw = 200hp Peak and 50kw= 67hp continuous.....
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Post by Boomzilla on Nov 16, 2024 12:15:11 GMT -5
Now that I have keyboard height adjusted, and an office chair selected and ordered, I am thinking that a footrest might also be helpful.
Does anyone here use an under-desk footrest? I've done a bit of online research and the main impediment I find is that the (vast) majority of commercially-available footrests are designed to park your feet no more than a couple of inches apart. To use any of them, I'd not only need to put my feet (almost) together, but also virtually parallel to each other.
My feet do NOT feel comfortable that way. I normally keep my feet about a foot apart, and my toes angle out. Maybe I should consider buying two foot rests? But before making any decisions, I thought that I'd ask for feedback.
Thanks - Glenn
PS - I went to the Curriculum Advisory Committee meeting yesterday for the University where I teach, and began talks about creating a new textbook. Should that project come to fruition, I'll be doing a lot of writing...
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Post by leonski on Nov 16, 2024 16:03:26 GMT -5
DIY footrest?
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Post by Boomzilla on Nov 16, 2024 18:54:25 GMT -5
Nah - taking into account my time, and the fact that every style you can imagine sells very cheaply online, I find absolutely no motivation for DIY. |
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Post by leonski on Nov 16, 2024 21:01:17 GMT -5
I could think of many DIY 'features' which could be built in with little additional trouble.......
And have something with (apparently) the width you require as well as Individually adjustable foot treads.....
for angle and distance....
I start thinking about using 1x4 and some piano hinge. As well as a 'stop' mechanism....to be designed....
to adjust tip of each tread......
Finish with Boiled Lindseed Oil
Just need to see several examples of what is available to 'shop' features and dimensions.
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Post by marcl on Nov 16, 2024 21:09:34 GMT -5
I could think of many DIY 'features' which could be built in with little additional trouble....... And have something with (apparently) the width you require as well as Individually adjustable foot treads..... for angle and distance.... I start thinking about using 1x4 and some piano hinge. As well as a 'stop' mechanism....to be designed.... to adjust tip of each tread...... Finish with Boiled Lindseed Oil Just need to see several examples of what is available to 'shop' features and dimensions. I think the old sewing machine treadles connected to a little generator would be the ticket ... pedal your way around the intertubes  |
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Post by Boomzilla on Nov 16, 2024 22:23:51 GMT -5
Sorry, leonski - I just no longer have the motivation for DIY projects. A combination of sports (in my youth), arthritis, and chronic neck pain (I see a neurosurgeon on Tuesday) have persuaded me to look at other options. But thanks anyway for the encouragement! |
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Post by Boomzilla on Nov 17, 2024 23:28:53 GMT -5
An audio amigo sent me this blog article on bass management, that I read: htenthusiasts.com/blogs/news/small-or-large-bass-management-simplifiedAfter consideration, I replied to my audio amigo: I've read Mr. Crabb's bass management article. BUT there are circumstances where I disagree. The "advantages" he cites in favor of bass management (although true) can come with a sonic price (and sometimes, a VERY heavy price).
Remember that to do bass management, digital signal processing (DSP) must be applied (inside the AVR / preamplifier). Remember, also, that AVRs (and almost all "full-featured" preamplifiers) are built to a specific price point, and that the DSP chips (being "out-of-sight/out-of-mind," inside the AVR/Preamp) are a favorite place for manufacturers to save $$$.
Now on the low-pass side (the subwoofer feed), the cheap DSP makes absolutely NO difference. Bass distortion from the sub itself is orders of magnitude higher than any contribution from the DSP hardware.
But on the high-pass side, it's like running your whole audio stream through that 10-cent DSP chip. The decline in audio quality IS audible (at least to me)!
Why did you spend the money to buy a high-quality, expensive front end, and high-quality expensive speakers to listen through a cheap-ass DSP chipset?
The problem is (MUCH) worse if you feed your AVR from any analog source (turntable, DAC, tuner, etc. Then, the AVR must convert the analog signal to digital, apply the cheap DSP, and THEN convert the files BACK to analog! Every A/D-D/A conversion costs some sound quality, and especially if you're using really cheap converter chips.
Sometimes it's better to run the satellites full-range and do low-pass filtering at the sub's plate amp!Note that my comments also apply to mini-DSP applications, and ANY other situation where an analog audio stream must be digitized and then returned to analog. THIS is why I don't like the sound of Crown XLS-series amplifiers. No there's no doubt in my mind that I will get jumped on for the opinions that I've expressed above, and that's OK - it's a free country and everyone's entitled to their opinions; the above are mine. Boomzilla |
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Post by marcl on Nov 18, 2024 9:52:00 GMT -5
An audio amigo sent me this blog article on bass management, that I read: htenthusiasts.com/blogs/news/small-or-large-bass-management-simplifiedAfter consideration, I replied to my audio amigo: I've read Mr. Crabb's bass management article. BUT there are circumstances where I disagree. The "advantages" he cites in favor of bass management (although true) can come with a sonic price (and sometimes, a VERY heavy price).
Remember that to do bass management, digital signal processing (DSP) must be applied (inside the AVR / preamplifier). Remember, also, that AVRs (and almost all "full-featured" preamplifiers) are built to a specific price point, and that the DSP chips (being "out-of-sight/out-of-mind," inside the AVR/Preamp) are a favorite place for manufacturers to save $$$.
Now on the low-pass side (the subwoofer feed), the cheap DSP makes absolutely NO difference. Bass distortion from the sub itself is orders of magnitude higher than any contribution from the DSP hardware.
But on the high-pass side, it's like running your whole audio stream through that 10-cent DSP chip. The decline in audio quality IS audible (at least to me)!
Why did you spend the money to buy a high-quality, expensive front end, and high-quality expensive speakers to listen through a cheap-ass DSP chipset?
The problem is (MUCH) worse if you feed your AVR from any analog source (turntable, DAC, tuner, etc. Then, the AVR must convert the analog signal to digital, apply the cheap DSP, and THEN convert the files BACK to analog! Every A/D-D/A conversion costs some sound quality, and especially if you're using really cheap converter chips.
Sometimes it's better to run the satellites full-range and do low-pass filtering at the sub's plate amp!Note that my comments also apply to mini-DSP applications, and ANY other situation where an analog audio stream must be digitized and then returned to analog. THIS is why I don't like the sound of Crown XLS-series amplifiers. No there's no doubt in my mind that I will get jumped on for the opinions that I've expressed above, and that's OK - it's a free country and everyone's entitled to their opinions; the above are mine. Boomzilla I wrote a very long and profound reply over the past half hour . I clicked Create Post and it said like "whoops you don't happen to be logged in all of a sudden so we trashed your post for you"  Oh well ... the short version is I think I agree with you and him .... and your objections only apply to the case of a signal path that starts analog and ends analog with no conversion to digital; and adding a miniDSP HD after a DAC to do Bass Management that could not be done in the previous analog domain. Am I right? I think the context of the article is multichannel AV processors and receivers, so it all happens in the DSP with everything else before the DACs. You could use a very high quality miniDSP Flex to do Bass Management after a high quality DAC, Or there are analog solutions like XKitz for a few hundred bucks up to Marchand for a couple thousand. So ... have I understood correctly ... did I miss anything? |
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KeithL
Administrator
Posts: 10,261
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Post by KeithL on Nov 18, 2024 16:11:07 GMT -5
I've had that happen... more than once... Or had the draft simply disappear after I walked away for a while... I've also had a post disappear when I clicked the Create Post key... The answer is to back up your post... In this case, if you type something long and profound, highlight it and clip it to the clipboard (Ctrl-C) in Windows.... If it "mysteriously vanishes" you can get it back by pasting it (Ctrl-V)... And, if not, you can just forget about the clipboard... (If you do Ctrl-C again it will overwrite whatever was there before...) ............................ I wrote a very long and profound reply over the past half hour . I clicked Create Post and it said like "whoops you don't happen to be logged in all of a sudden so we trashed your post for you" ...................... |
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Post by marcl on Nov 18, 2024 16:15:27 GMT -5
I've had that happen... more than once... Or had the draft simply disappear after I walked away for a while... I've also had a post disappear when I clicked the Create Post key... The answer is to back up your post... In this case, if you type something long and profound, highlight it and clip it to the clipboard (Ctrl-C) in Windows.... If it "mysteriously vanishes" you can get it back by pasting it (Ctrl-V)... And, if not, you can just forget about the clipboard... (If you do Ctrl-C again it will overwrite whatever was there before...) I wrote a very long and profound reply over the past half hour . I clicked Create Post and it said like "whoops you don't happen to be logged in all of a sudden so we trashed your post for you" ...................... Yes I very often do that. In this case in my reply to Boom maybe I was more concise in the rewrite. Over the years I swear Powerpoint used to let me close files without saving every once in a while. But while we're talking  .... can you tell us, does all the Dirac processing, surround and Atmos decoding, PEQ, bass and treble trims ... and Bass Magagement ... all happen in the same DSP chip? |
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Post by Boomzilla on Nov 18, 2024 22:30:55 GMT -5
Hi marcl - I almost sent a prompt response to your previous post, but then stopped to think a bit more before replying. After further consideration, no, I don’t think that my objections concerning “bass management” pertain only to analog sources. Why? Because my last post on the topic mixed up two different things, digital conversion (A/D-D/A) and Digital Signal Processing (DSP). The former applies only to analog signals that have to be converted to digital for whatever reason and then be converted back to analog. Cheap converters cause readily audible sonic degradation (a widely-measured and agreed-upon artifact). Although this degradation is inaudible at subwoofer frequencies, it is VERY audible at higher frequencies. But digital bass management also creates audible artifacts in purely digital bitstreams! Even if you’re feeding your AVR a purely digital signal (streaming, digital output from a disc player, etc.) the “lowest-possible-cost” DSP chip in your processor that’s being used for bass management is still creating audible distortion in it’s high-pass section. I’ve found, aegain and again that I get cleaner sound (particularly in the treble end) when I don’t use DSP bass management. By adjusting the low-pass frequency via the sub’s plate amp, adjusting phase at the sub, and carefully matching gains, I am more likely to achieve an “invisible blend” between the satellites and the sub(s) than when I’m using digital bass management. Glenn |
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Post by marcl on Nov 19, 2024 2:16:33 GMT -5
Hi marcl - I almost sent a prompt response to your previous post, but then stopped to think a bit more before replying. After further consideration, no, I don’t think that my objections concerning “bass management” pertain only to analog sources. Why? Because my last post on the topic mixed up two different things, digital conversion (A/D-D/A) and Digital Signal Processing (DSP). The former applies only to analog signals that have to be converted to digital for whatever reason and then be converted back to analog. Cheap converters cause readily audible sonic degradation (a widely-measured and agreed-upon artifact). Although this degradation is inaudible at subwoofer frequencies, it is VERY audible at higher frequencies. But digital bass management also creates audible artifacts in purely digital bitstreams! Even if you’re feeding your AVR a purely digital signal (streaming, digital output from a disc player, etc.) the “lowest-possible-cost” DSP chip in your processor that’s being used for bass management is still creating audible distortion in it’s high-pass section. I’ve found, aegain and again that I get cleaner sound (particularly in the treble end) when I don’t use DSP bass management. By adjusting the low-pass frequency via the sub’s plate amp, adjusting phase at the sub, and carefully matching gains, I am more likely to achieve an “invisible blend” between the satellites and the sub(s) than when I’m using digital bass management. Glenn Okay I think I understood the distinction (my deleted post went into that more ) and to the first point of A/D-D/A yes I had no issue doing it for subs but I didn't want to run my main L/R through the miniDSP 2x4 Balanced or 2x4 HD. But what about the miniDSP Flex? Seems like that would do the job very well ... and a scenario might be analog 2-channel, but you want to have Bass Management and Dirac. In your last paragraph are you saying you run all speakers full range without a high pass, and just set your crossover in the sub plate amp high enough to fill in the bottom? Do you do this with speakers that have to be crossed at 80-120Hz or do you mean just 2-channel with mains that go down to 40-50? And regarding the use of DSP bass management in the processor ... maybe keithl can chime in on whether the DSP Bass Management is done in its own “lowest-possible-cost” DSP chip, or if it's done in the same DSP chip that handles everything else ... i.e. the signal goes through it whether you do Bass Management or not. |
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.... can you tell us, does all the Dirac processing, surround and Atmos decoding, PEQ, bass and treble trims ... and Bass Magagement ... all happen in the same DSP chip?