Thanks. The top and bottom sections are held together by just 3 bolts, and the drivers in the top section are lightweight, so I can take this apart and move it around very easily. If you want to hear them sometime, I can bring them to NOVA in my van. I'm still interested in seeing this design become a commercial product, and I'd like to discuss some ideas about making this more "manufacturable".
Hi Neil,
Sure we can discuss taking this to commercial product - one key thing to make sure you have in place is supply chain and making sure parts are not EOL. Looking forward to your microphone meausurements.
Sure we can discuss taking this to commercial product - one key thing to make sure you have in place is supply chain and making sure parts are not EOL. Looking forward to your microphone meausurements.
Hi,
back again after the very hot sommer - and on the bench tonight are my new class D ICEpower1200AS1 based monoblocks.
They are mechanically finished now, and I plan to finish the wiring until this weekend.
back again after the very hot sommer - and on the bench tonight are my new class D ICEpower1200AS1 based monoblocks.
They are mechanically finished now, and I plan to finish the wiring until this weekend.
Many thanks Viet! 😀
Acoustic Field Generator - it's a built-in Schumann-generator 🙈
I made very good experience with external Schumanns (Acoustic Revive RR-777 and Synergistic Research FEQ) in blind tests with my friends, so I thought "why not?" - it's diy
But the whole thing is fed by the external HyperSET-preamp 😀
Acoustic Field Generator - it's a built-in Schumann-generator 🙈
I made very good experience with external Schumanns (Acoustic Revive RR-777 and Synergistic Research FEQ) in blind tests with my friends, so I thought "why not?" - it's diy
But the whole thing is fed by the external HyperSET-preamp 😀
I didn't hear anything about it until 5-6 years ago. Then we were at the Vienna High End show and there we were "tricked" at a stand... The sound was beautiful - until the exhibitor did something behind our backs without our knowledge and the sound changed from beautiful to "wow, what happened now, as if a veil had disappeared!!". Then he showed what he did and what small device he turned on and off - it was a Schumann generator. For us it was a must have... The Schumann generator generates the so-called earth resonance of 7.83 Hz, which is the so-called Schumann resonance. It has existed since the beginning of Earth's history and is also encoded in our genes, and all living things on Earth have adapted to it. With our "electrosmog" we disrupt or at least disturb this resonance - but with a generator you can restore it on a small scale, and the effect is unmistakable. As I said, we have done countless blind tests and there is no doubt. I use both of the devices I mentioned, but sometimes I forget to turn one of them on and then I think, what happened to the sound, is something broken? Something like that 😀
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I've no doubt you sense what you sense, but it'd be interesting how a device generates a field you can be in at such a low frequency?
Some of us have probably seen the wire loops on the back cover of old tube tabletop AM radios. So there;s a physical dimension corresponding to, say, ~800 kHz. With Schumann we're talking ~8 Hz. Only, you know, 100,000 X difference. How is that practically radiated as a electrostatic or magnetic field, from an appliance sized device?
If one wound a flat spiral coil of wire around the entire surface of the living room floor, then put the carpet and furniture back in place, that would be a shred more believable from a practical standpoint. Just wondering how a box someone could sell and ship can do it?
Any chance of DIY? I have a function generator that I could punch up 7.83 into. But what would I connect it to to put myself in some kind of field at that frequency? Something making RF with an AM modulation input? The radio frequency is what gets you in, the modulation frequency is what get you the effect?
I really don't know. It of course has an antenna as part of the pcb (and a discrete antenna in the SR FEQ) and I can measure the electromagnetic field, generated by the thingie (I have the equipment for my job). The Schumann resonance is weak, so I think a weak local generator can create a weak field too. And it works.
Diy? Yes, of course, there are many circuits available, solid state and tube.
Diy? Yes, of course, there are many circuits available, solid state and tube.
How does the measure appear? Guessing you have access to an RF spectrum analyser. One time I borrowed a wide-band handheld field strength meter from work, to see if the field from the nearby gigantic power lines made it to my house. Walking down the road away from directly underneath, it fell off pretty rapidly - thank God for 1/square of the distance!
If you can share a link for a diy or commercial Schumann resonance generator that would be appreciated. Plus a photo of what one looks like inside your box. Interesting stuff.
I can measure a difference of 0.1-0.2 V/m in the field strength - but I don't know if it's a normal fluctuation or the effect of the generator. The amplitude of the Schumann resonance is extremely low and can be measured only with the most sensible equipment. So I don't have any real evidence 😀 just what I hear. I recommend further reading, it's very interesting.
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Hi Viet, there are many circuits around in the net, for example http://fabioangeletti.altervista.or...ing_wp_cron=1726812820.9383718967437744140625
I ordered mine from big river, there are many finished products for 5-10 euros/dollars and of course there are high end versions for much more money... Mine is a 7 euro thingie, I just wanted to check if and how it works in an amp 🤔 For room treatment I recommend products from Acoustic Revive and Synergistic Research.
Could you clarify those
H2 signal processor .. to me it sounds like a different name/ version of the simple Pass diy pre with adjustable H2
And “SS bypass” bypassing the Korg tube?
I’d think you could be reluctant, but theres the product rather than a CAD image.. so you must be at least 3/4 there.. what’s the likely price? +/- 10 or 20% - quite a bit of latitude
Hi Otto88
I was referring to the HyperSET tube preamp that Plott was using to drive the 1200AS2. Same one that is used on EP600 amp. There is a a toggle switch that bypasses the E88CC tube buffer stage for a purely solid state signal path (all premium OPA1642 or 1656 opamps and OPA1637 balanced output driver opamps). With the tube stage enabled there is a dominant second harmonic distortion profile but still very low THD. You can find out more in the HyperSET thread. These are available RTR (provide your own tubes).
https://www.diyaudio.com/community/threads/btsb-with-tube-buffer-hyperset-gb.396848/
Which product are you asking about that has a CAD image?
I was referring to the HyperSET tube preamp that Plott was using to drive the 1200AS2. Same one that is used on EP600 amp. There is a a toggle switch that bypasses the E88CC tube buffer stage for a purely solid state signal path (all premium OPA1642 or 1656 opamps and OPA1637 balanced output driver opamps). With the tube stage enabled there is a dominant second harmonic distortion profile but still very low THD. You can find out more in the HyperSET thread. These are available RTR (provide your own tubes).
https://www.diyaudio.com/community/threads/btsb-with-tube-buffer-hyperset-gb.396848/
Which product are you asking about that has a CAD image?
Hi Viet, do you recommend Keratherm or goop under the IceEdge 1200AS1?
Or just put it onto the aluminum?
Or just put it onto the aluminum?
Unless you plan on running it at 600w continuously (60w dissipation for 90% efficiency), there is no need for goop. Keratherm would be a very large sheet and not necessary. If you run it at 100w max continuously that is 10w dissipation and not a problem for plain metal to metal contact (with anodized surface treatment in between) as long as surfaces are flat. I assembled mine without any thermal paste.
A quick search on Aliexpress and I find it’s a lot less expensive than I thought at 300mm x 1m roll for $13! You could insulate hundreds of small TO-247 for that price. Or a dozen 1200AS2 amps. So I guess it doesn’t hurt to use it and would add a nice touch. Make sure you add a grounding cable from chassis earth ground to the baseplate in any event.
https://a.aliexpress.com/_m0JuxTI
A quick search on Aliexpress and I find it’s a lot less expensive than I thought at 300mm x 1m roll for $13! You could insulate hundreds of small TO-247 for that price. Or a dozen 1200AS2 amps. So I guess it doesn’t hurt to use it and would add a nice touch. Make sure you add a grounding cable from chassis earth ground to the baseplate in any event.
https://a.aliexpress.com/_m0JuxTI
Cool, many thanks!
It happens that I have big sheets of Keratherm so will use it.
The baseplate grounding cable is already prepared 😀
It happens that I have big sheets of Keratherm so will use it.
The baseplate grounding cable is already prepared 😀
Technically not on the bench, but...
First test run of my T20 SE amp. A bit of hum to deal with, but as anyone can see there's some work left on the power supply... 😀
First test run of my T20 SE amp. A bit of hum to deal with, but as anyone can see there's some work left on the power supply... 😀