Thank you for the reference.
I've got this formula in some application-oriented papers and books, far away from the current subject.
Regards,
Braca
If you think about it the odds in the simplest case are compressive and they can't cancel unless you have an expansive nonlinearity which has some problems with overload limits, etc. The loop tries to keep pushing no matter what.
Do you mean compressive in the sense the suspension is always resisting the movement no matter in which direction the cone is travelling?
Right so you keep pushing it harder to increase the pressure at both limits. With second harmonic each side is pushing harder in one direction than the other so adding them out of phase tends to have some cancellation.
Got it, I'd read re isobaric 2nd harmonic only gets cancelled to a degree but never read why. Your simple explanation is clear to my simple mind, thanks 🙂
Just that I think it is a significant problem of the suspensions also. some in the magnetics.... but I think we are capable of making the magnetics better than what we have done with the suspension design. The magnetics have to drive thru the suspension stiffness and nonlinearities.
Brutt force method is to have ultra powerful magnetic system. Like those sub woofers I bought..... 50 pounds of magnet !
but, all are doing great here with out of the box thinking on these ancient design problems … we arent stuck with that Kellogg basic design either. such as the magnetic suspensions could be developed further.
we havent talked about two cones attached end to end on the same VC and how that config could be used to cancel distortion.
THx-Richard
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Wouldn't that amount to the same as a push-pull configuration?
It could make a very nice dipole 😉
yes but same spider suspension and magnetics and would give more accurate concellation if done correctly. doesnt have to be dipole either.... depending on enclosure design with it.
Not to mention lower cost than two separate drivers.
Just feeding/fueling the thinking.
-RNM
Not to mention lower cost than two separate drivers.
Just feeding/fueling the thinking.
-RNM
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No I have not seen it. But, Right down my ally.
could be as I suggested also..... dipole-like.
🙂 😎
-RM
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A wide band, parallel to ac line, trap filter. Shunt all noise to ground -- acts like short circuit to other freq than 50-60Hz. And, not in series... esp useful with power amps.
But has to be broad band resistive and not reactive line termination.
THx-RNMarsh
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I know but it is worded so strange that I wanted clarification.
Side question.... for truly high end gear; what is a good amount of voltage sensitivity for an amp? 2vrms is seeming low for source output, without gain along the way. On my personal stereo I always seem to run out of volume. That isn't an issue at some friends places with big rooms and fancy gear. Problem is hardly anyone lists these specs...
Side question.... for truly high end gear; what is a good amount of voltage sensitivity for an amp? 2vrms is seeming low for source output, without gain along the way. On my personal stereo I always seem to run out of volume. That isn't an issue at some friends places with big rooms and fancy gear. Problem is hardly anyone lists these specs...
I don't think it is very fair to call it consumer level if you are powering 83db efficient speakers with the X600.8 from PL, in a room big enough to be someones house. And at that point how much voltage input do you need to not run out of gain for highly dynamic, high crest factor, music?
I could be wrong, and need to find info again but for example Thrax may be running up to 10v or something, I forget.
I could be wrong, and need to find info again but for example Thrax may be running up to 10v or something, I forget.
Just something to share...… a lot of test equipment is expensive -- even used test equipment can break a budget.
If you have access to a schematic of the test equipment you want, you can buy "as-is" equipment and "easily" find the bad part and replace it and be good to go.
I have saved a lot of money that way. An expensive 6GHz HP network analyzer -- runs in the tens of thousands used. I found an As-Is unit..... the description was that some of the functions didnt respond from front panel buttons. AhHa! The old pressure contact switches used a graphite that wears off with repeated pressure/use. Bought it and checked and cleaned the front panel controls and now works perfectly.
On two separate occasions I bought As-Is HP-339A THD meters. One had a fuse inside that gave out - replaced it and worked perfectly. The other had an open relay coil. replaced the relay... works perfectly.
You can find the Monster HTP-7000 power conditioner cheap also in a lot of cases. I got one off eBay and all it had was a blown fuse on one of the duplex outlets. Rear panel mounted, too ! Works perfectly.
A lot of gear which is obsolete, you cannot take it to a dealer for repair.... A-V dealers dont have a repair department any more. And mfr wont do it either in most cases.
Besides getting something useful that you want, the trouble shooting process is helpful in learning how circuits work.
THx-RNMarsh
PS... The fuse was on a isolation transformer output. Rating of fuse is silk screened on pack of chassis as 2A/120v. So the outlet can be loaded quiet a bit with most anything but a power amp. Earlier I mis-said it was 100VA... No it is closer to 200+VA.
If you have access to a schematic of the test equipment you want, you can buy "as-is" equipment and "easily" find the bad part and replace it and be good to go.
I have saved a lot of money that way. An expensive 6GHz HP network analyzer -- runs in the tens of thousands used. I found an As-Is unit..... the description was that some of the functions didnt respond from front panel buttons. AhHa! The old pressure contact switches used a graphite that wears off with repeated pressure/use. Bought it and checked and cleaned the front panel controls and now works perfectly.
On two separate occasions I bought As-Is HP-339A THD meters. One had a fuse inside that gave out - replaced it and worked perfectly. The other had an open relay coil. replaced the relay... works perfectly.
You can find the Monster HTP-7000 power conditioner cheap also in a lot of cases. I got one off eBay and all it had was a blown fuse on one of the duplex outlets. Rear panel mounted, too ! Works perfectly.
A lot of gear which is obsolete, you cannot take it to a dealer for repair.... A-V dealers dont have a repair department any more. And mfr wont do it either in most cases.
Besides getting something useful that you want, the trouble shooting process is helpful in learning how circuits work.
THx-RNMarsh
PS... The fuse was on a isolation transformer output. Rating of fuse is silk screened on pack of chassis as 2A/120v. So the outlet can be loaded quiet a bit with most anything but a power amp. Earlier I mis-said it was 100VA... No it is closer to 200+VA.
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