Re: Re: Re: Re: Re: Re: Re: Re: VAS fighting
See pic, the 250 Ohms also does wonders when the rail is hit. Still optimizing on a back burner. I mis-spoke one of the comp caps can be 20pF and the other 25pF with no noticable effect (seconds go from -inf to -120dB in the case of perfect matching trannies), that's more like 20%.
G.Kleinschmidt said:
😱
Is that 250 ohms of emitter (source) degeneration or 250 ohms collector (drain) load?
Cheers,
Glen
See pic, the 250 Ohms also does wonders when the rail is hit. Still optimizing on a back burner. I mis-spoke one of the comp caps can be 20pF and the other 25pF with no noticable effect (seconds go from -inf to -120dB in the case of perfect matching trannies), that's more like 20%.
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Re: Re: Re: Re: Re: Re: Re: Re: Re: VAS fighting
Q7 and Q9 are the needed?
scott wurcer said:
See pic, the 250 Ohms also does wonders when the rail is hit. Still optimizing on a back burner. I mis-spoke one of the comp caps can be 20pF and the other 25pF with no noticable effect (seconds go from -inf to -120dB in the case of perfect matching trannies), that's more like 20%.
Q7 and Q9 are the needed?
PMA said:Nonsense: church organ, grand choir, philharmony orchestra are untransferable to speaker.
A speaker in a living room. The space a speaker is in has a lot to do with what it can sound like.
But that still isn't my point. Few recordings are untouched transcriptions of mikes dropped into a space. Even fewer of those are listenable. The experience in front of a speaker is not the same experience. Many sensory elements are missing that could influence the perception. The recording engineer and the mastering engineer do wondrous things to make those recordings seem more real. Are those recordings less enjoyable because they have been edited, "mixed" "sweetened" etc? There is even a technique of passing an all digital recording through a tape stage to "improve" it. While part of me cringes at the process I find I like the effect and it doesn't destroy the music.
As much as I am an obsessed purist I must acknowledge that the experience I get in front of my speakers is a unique experience at that time. Its not the experience in the concert hall with the performer in front of an audience. It can't be. I can bring my experience of the concert hall and 'relive" that experience triggered from the reproduction in my living room. But its not the same and someone who has never been in a concert hall would not be able to get the remembered experience overlayed on the current experience.
If we spend time arguing about how many angels can dance on the head of a pin we may be missing the point. Make something you enjoy. And if you have the constitution to handle the inevitable criticism make something for others to enjoy.
Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: VAS fighting
Possibly not anymore, they are free in IC land 🙂 Clamps are like caulk, you never have enough.
stinius said:
Q7 and Q9 are the needed?
Possibly not anymore, they are free in IC land 🙂 Clamps are like caulk, you never have enough.
Demian, I once knew a guy who worked with 'Hi Fi News' who had made a mono bass horn UNDER his living room floor, where the outlet was a grille in the floor. You sat on beach chairs on the grill for best reception. As I remember it, he had a horn cut-off of 15Hz, and it was driven with 2 full size woofers. Wow, he could make you sick, if he wanted too!
However the chairs had more legroom than any of the concert halls I have been in in the last year. . .john curl said:Demian, I once knew a guy who worked with 'Hi Fi News' who had made a mono bass horn UNDER his living room floor, where the outlet was a grille in the floor. You sat on beach chairs on the grill for best reception. As I remember it, he had a horn cut-off of 15Hz, and it was driven with 2 full size woofers. Wow, he could make you sick, if he wanted too!
At least there was no structural damage like at georgia tech..
They blew the doors OFF the hinges with that one. 😱
In Italy they did a 10hz fc folded horn in the floor as well.
http://www.royaldevice.com/custom.htm#THE%20REAL%20TOTAL%20HORN
OS

They blew the doors OFF the hinges with that one. 😱
In Italy they did a 10hz fc folded horn in the floor as well.
http://www.royaldevice.com/custom.htm#THE%20REAL%20TOTAL%20HORN
OS
He used two Quad electrostats, placed at the same distance from the origin in the living-room itself. He also added an oscillator calibrated to add whatever bass organ note might not have been transmitted on the record, itself. He could 'play' along. His name was Rex Baldock.
NASA built a >180dB SPL pneumatic transducer to test the Saturn launch platform. It could fracture reinforced concrete.
Right, it's been a long time since I had a Foster's. Maybe chasing a Perth's Golden Egg, would do it.
Rex Baldock was a great audio engineer. He died a few years ago, BUT he was on the masthead of 'Hi Fi News' for decades. He wrote many articles and played the organ in church, so he made his hi fi do something extra special. IF any of you would study the efforts of others of the past, you might learn something extra also.
Church organ music? Motel room didgeridoo is more fun. Eat some baked beans or tacos the night before. If you sit down in the shower at 6am and make a good airtight seal over the drain hole you can scare everyone in the unit block awake.
originally posted by Scott Wurcer
Right, it's been a long time since I had a Foster's. Maybe chasing a Perth's Golden Egg, would do it.
I had to look up Perth's Golden Egg but that sounds like a winning ticket. It's been a long time for me with Foster's too. Isn't what we get in the US now made in Canada? I think that's when I stopped drinking it. The Golden Egg thing reminds me of the pickled eggs that were served out of gallon jars at bars back in Ohio. Along with pickled pig's feet and spicy red hots.
Glen -- Let me know if you're ever in New Mexico. I can fix you up with some excellent taco tweaking supplies.
This is a grill of my subwoofer: concrete horn under the floor in a living room. Cutoff frequency is 30 Hz. It is absolutely useless for music reproduction including church organs, but a great thing for movies.

Do you guys light them too, for special effect?
What amazes me is that you come over to this thread where some of us are contributing, and you make flatulence jokes. You should have gotten over this in high school, but perhaps some of you were repressed at the time (unlike me) and so you now find it funny, now that you are free of the authoritarian climate that you were raised in. Do you drive autos the same way?
What amazes me is that you come over to this thread where some of us are contributing, and you make flatulence jokes. You should have gotten over this in high school, but perhaps some of you were repressed at the time (unlike me) and so you now find it funny, now that you are free of the authoritarian climate that you were raised in. Do you drive autos the same way?
scott wurcer said:NASA built a >180dB SPL pneumatic transducer to test the Saturn launch platform. It could fracture reinforced concrete.
Meyer Sound demonstrated their weapon on AES in San Francisco: array of tweeters, 2-9 KHz range, about 3 feet in diameter. However, their civil speakers were less impressive: when I knocked grills they were ringing like bells.
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