Happy Bday.
Loved the link. The smaller ones will break even first, ITER is too big to be stable..
John
Worst case if a there is a component failure and loss of transformer isolation would still be 60 not 120 VAC. But as this was proof of concept and led to better methods, moot issue.
Ah gotta go my neutral line fuses are a blowing...
I think I related the story of Keith Johnson having the (amazingly bad) luck to get a defective powered speaker that apparently (he destroyed the evidence) had a misinstalled bracket insert wind up shorting the AC neutral to the signal common. He was alerted to this when plugging the line level input into his fancy Pacific Microsonics DAC and promptly blowing out the DAC output stages. He was using the Equitech balanced mains power approach in his lab, and both sides of the single-phase AC were producing 60V rms. Ouch! I had to field the problem, my boss having downplayed the significance and saying that it was probably some idiot that had taken the speaker apart and broken it.
I explained to him who KOJ was.
I was able to reassure Keith that certainly the design did not involve any referencing of the mains to the system signal ground, and that this was some bizarre manufacturing defect. I tried to reproduce it to no avail, and as far as I know Johnson, out of a few hundred thousand users, was the only person to have the failure mode! We instituted some assembly line test to make sure that there was no conductivity between the a.c. line and system common thereafter.
I explained to him who KOJ was.
I was able to reassure Keith that certainly the design did not involve any referencing of the mains to the system signal ground, and that this was some bizarre manufacturing defect. I tried to reproduce it to no avail, and as far as I know Johnson, out of a few hundred thousand users, was the only person to have the failure mode! We instituted some assembly line test to make sure that there was no conductivity between the a.c. line and system common thereafter.
James B. Lansing M2 Master Reference Monitor has been ordered and is on its way here to beautiful, sunny down town Cool, CA.
Why? High dynamic range without distortion nor compression, very low distortion, controlled directivity, wide and flat freq response.... to name a few.
[ I haven't told Lisa the cost, yet. She pays the bills. Should I let her be surprised at the CC balance and find out that way?]
here's to living dangerously.
THx- RNMarsh
Why? High dynamic range without distortion nor compression, very low distortion, controlled directivity, wide and flat freq response.... to name a few.
[ I haven't told Lisa the cost, yet. She pays the bills. Should I let her be surprised at the CC balance and find out that way?]
here's to living dangerously. THx- RNMarsh
Did you get them bundled with the EQ/power amps?James B. Lansing M2 Master Reference Monitor has been ordered and is on its way here to beautiful, sunny down town Cool, CA.
Why? High dynamic range without distortion nor compression, very low distortion, controlled directivity, wide and flat freq response.... to name a few.
[ I haven't told Lisa the cost, yet. She pays the bills. Should I let her be surprised at the CC balance and find out that way?]
THx- RNMarsh
I haven't heard them yet, although Sean Olive praises them highly. I told him that I thought JBL made an error bundling them with amps, as people like to select their own amps.
My current speakers are nice.... before them I had a pair of QUAD ESL63 speakers. very flat and very low distortion and somewhat controlled dispersion. But lacking dynamic range and bass extension. The ones I use now have the bass extension (2-15" per cabinet) and are reasonably flat but not as low distortion... its always something lacking with speaker systems. But the Ref Monitor has it all. Not many do all these important parameters and when they have flat freq response and good dynamic range, the dispersion isnt controlled well or the distortion is higher than I like. So this may have all the things lacking here or there taken care of but at a price.
Thier amps have built in DSP and the crossover is exactly matched and EQ'ed for these speaker/enclosure. So it is more than just an amplifier.
HOWEVER, the bells and whistles these things can do for PRO use is way over kill for a home situation. Very flexible but I dont need that. SO, I found that there is a site where I can download the JBL code for the M2 and use my own DSP to run things. And, then my own amps. That is what I am going to do. I am starting with the "miniDSP' for the cross-over with JBL code downloaded into it. A bit of a learning curve but should be doable. The uber amps based on CFA by Damir are being built and will be completed in Oct-Nov. So, I have time.
I hope these will last me a very long time of listening pleasure.
THx-RNMarsh
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I'm sure you'll be happy with Damier's CFA amps, very much in the same vein as O'stripper was going on his thread. I'll be interested in how you feel about changing from a the ESL type of sound and dispersion to a two way with horn, a fairly dramatic change to say the least. You could always put the 15" drivers you have to use as distributed subs in new enclosures spread around the room.
James B. Lansing M2 Master Reference Monitor has been ordered and is on its way here to beautiful, sunny down town Cool, CA.
[ I haven't told Lisa the cost, yet. She pays the bills. Should I let her be surprised at the CC balance and find out that way?]
THx- RNMarsh
How is she going to feel when you open them up and replace all the capacitors?
One pair M2 = infinite dresses, shoes, restaurant meals.[ I haven't told Lisa the cost, yet. She pays the bills. Should I let her be surprised at the CC balance and find out that way?]
Works out to being doubly expensive new speakers, but hey, why not lol.
Congratulations, I look forward to your reports.
Dan.
I don't see the issue there are several audiophool speakers at 10X available.
Did I tell you about Elon's purchase of two 60k-each speakers for his home theater? Then his regular audio consultant (who had not been consulted in this particular purchase) said he needed a center channel. Now up to 180k USD (and that's not counting the undoubtedly expensive amps), my friend got a call from the desperate consultant to help him out. The friend went over and said the room was not suitable although the speakers might be o.k. in another room. Musk had had them them much too close to the back wall.
The friend recommended M2s for the HT.
You forget I don't benefit more financially one way or the other, I try to do my job. OTOH helping prove Einstein was right has a special satisfaction for me.
Considering virtually nothing has been done in years to improve or make new discrete devices I don't see how much more mileage one can get reworking the same old stuff. It's impressive how the fashion audio market sustains itself.
EDIT - If you actually read what I said the JBL's in question are far less than the current wave of ultra fashion speakers, disappointingly (not!) predictable that Mr. Musk would behave like he thinks all his customers should.
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That is what we both do, Scott. I have no control over the final price of a Constellation product.
BUT, inside that phono preamp are parts that make your op amps cheap by comparison. Have you priced out the 2SK146-J73 complementary pairs recently? I had to use them in multiple serial parallel to get to the nominal 0.4nV/rt Hz differentially. Many hundreds of dollars, just for the input stage.
Yes, they don't make discrete parts like they used to! We have to scour the world for enough of them. That is one reason the new products are so expensive.
BUT, inside that phono preamp are parts that make your op amps cheap by comparison. Have you priced out the 2SK146-J73 complementary pairs recently? I had to use them in multiple serial parallel to get to the nominal 0.4nV/rt Hz differentially. Many hundreds of dollars, just for the input stage.
Yes, they don't make discrete parts like they used to! We have to scour the world for enough of them. That is one reason the new products are so expensive.
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> Have you priced out the 2SK146-J72 complementary pairs recently?
> I had to use them in multiple serial parallel to get
> to the nominal 0.4nV/rt Hz differentially.
Might as well use :
https://www.apexanalog.com/products/pa81-82.html
> I had to use them in multiple serial parallel to get
> to the nominal 0.4nV/rt Hz differentially.
Might as well use :
https://www.apexanalog.com/products/pa81-82.html
Even if you could do this with the Linear Systems (or any other recent parts) you wouldn't. That's what fashion audio is all about.
Don't you love it, put 10ohm in the source (eating all of the 0.4nV/rtHz noise spec), then parallel devices to lower the noise.
Wow!James B. Lansing M2 Master Reference Monitor has been ordered and is on its way here to beautiful, sunny down town Cool, CA.
Why? High dynamic range without distortion nor compression, very low distortion, controlled directivity, wide and flat freq response.... to name a few.
[ I haven't told Lisa the cost, yet. She pays the bills. Should I let her be surprised at the CC balance and find out that way?]
THx- RNMarsh
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