See attached. MOV is in parallel not series. So how does it 'match'?
Given that until the standards came along no one in high-end put any sort of filtering in and all our amplifiers picked up GSM phones when they came along I would say that the industry has done well from the regulations. People still spend silly money on external power filters when in fact they should be complaining to the hi-fi manufacturers for penny pinching on the design?
At least we are rid of the flat earth silliness of the 80s where some UK hi-enders claimed an LED would affect the sound...
Attachments
If you put the analyser on the DC rails of your pre-amp and turn the equipment on what do you see? I may be dense but surely the indication of a problem is when it gets onto the DC rails. If your toroids have been correctly specified with an electrostatic shield grot above the audio band shouldn't even get as far as the rectifiers?
Possibly the most researched and best ac line filtering ever to be offered to the consumer is the model HTPS-7000. It was selling well until the 2008-9 economic collapse. You can still find one now and then on ebay. The small price used doesnt even cover the cost of one ultra-isolation transformers.. Note individual isolation filters. Demian Martin over-saw the protection circuitry and i did the filter concept and designs. It is approved by all agencies (UL, VDE, CSA etc) for sale world-wide. Safe and very effective. It is no longer made.
In this picture.... upper right is the ac line without any connected equipment turned on. Below it is one of the isolation filters.... way below -100dB rejection.
Built like a military piece, get one if you can find one.
On my dvelopment bench.
Individual filters on each outlet.
THx-RNMarsh
In this picture.... upper right is the ac line without any connected equipment turned on. Below it is one of the isolation filters.... way below -100dB rejection.
Built like a military piece, get one if you can find one.
On my dvelopment bench.
Individual filters on each outlet.THx-RNMarsh
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Billshurv, problem is it is picked up by the input interconnects, the speaker wires, or, it gets into the equipment via the mains supply and then radiates inside the housing. So, its not noise on the DC supply rails necessarily that causes the problem. And, dropping the torroid transformer in favour of something more exotic is not a cure all either.
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PLC
Speaking of PLC.
I use the PLC and with test equipment I also learned how to make it extend its range and NOT cause interference to other connected equipment.
I selected a ferrite that has high Z at the freqs used by PLC transmitters. Placing one on each cord of connected equipment keeps the PLC signal going where it is needed and not split-off into various unintended routs and attenuated.
In the pictures I just took for you is my Video room getting a high speed internet movie streamed to it via PLC. Note the ferrite used to keep the PLC signal out of the video equipment et al.
Same for audio control of music files in another room.
Click on them and they go straight up.
THx-RNMarsh
Speaking of PLC.
I use the PLC and with test equipment I also learned how to make it extend its range and NOT cause interference to other connected equipment.
I selected a ferrite that has high Z at the freqs used by PLC transmitters. Placing one on each cord of connected equipment keeps the PLC signal going where it is needed and not split-off into various unintended routs and attenuated.
In the pictures I just took for you is my Video room getting a high speed internet movie streamed to it via PLC. Note the ferrite used to keep the PLC signal out of the video equipment et al.
Same for audio control of music files in another room.
Click on them and they go straight up.
THx-RNMarsh
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You mean it was selling well until monster screwed up badly first with speakers then with beats?
Beat By Dre: The Exclusive Inside Story of How Monster Lost the World
Could of course just be a complete co-incidence
I would not discount self-certification. Our authorities here in .de made a test
where some piece of dirt was passed around and all the accredited labs had
to measure it. The results were disgusting, and the labs _knew_ that this was
to check them. So how good are they on everyday work?
Especially in tests where they measure functionality under influence of
external fields, there is some leeway to determine what exactly "still works".
And the customer puts you under pressure that a camera that delivers
only a black screen is still acceptable behaviour. Deny that and you are out
of business with that customer. He is only interested in the signature, not
a good product. There are more than enough labs, and the customers
know soon who is "flexible".
Labs in large companies are usually accredited anyway. And for them it
is easy to test early, when the design is not yet completed.
You mean it was selling well until monster screwed up badly first with speakers then with beats?
Beat By Dre: The Exclusive Inside Story of How Monster Lost the World
Could of course just be a complete co-incidence
No -- it died when the literally thousands of retail audio stores and chains went out of business after the Crash.... taking our business with it.
Headphones came long afterwards and was the brain-child of an unproven kid who wanted to impress his father.
Fortunately, I was long gone by that time..... but also gone were the nice royalties. :-(
THx-RNMarsh
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Due to the odd way my brain works this has reminded me of a question I had. My sister in law has a sensible house which has structured cabling in and I was musing the best way to send audio between rooms. It's 100 Ohm twisted pair at the end of the day so a balanced signal at pro levels should happily pootle between floors? Seems on inspection a few boards using the whitlock THAT chips and jobs a goodun?
You said the crash was 2008-2009. Beats were launched in 2008. how is that 'long afterwards'?
Balanced interconnects. You know it makes sense
It's got to get past the thiele/zobel networks to cause mischief. Is this a real bogeyman in a well implemented power amp?
I would argue a toroid with an electrostatic shield is not exotic, just a correctly specified toroid.
Assuming you do have said shield then you have maybe 4" of input cable, which should be twisted together from which the radiation can emerge. I don't see that as an issue, but I would also think nothing of spending £6 on a shaffner filtered IEC connector for belt and braces.
Is anything more complex than that actually needed? Wanted is of course a completely different thing
scarily the Shunyata mains cables for their power conditioning setup cost more than the monster unit did. Oh and the Monster unit at least did filter and have useful extra features to turn your rig on. For $6000 shunyata sell you a 'noise isolation chamber'.
Maybe the issue is the monster unit actually did something rather than claim something?
Maybe the issue is the monster unit actually did something rather than claim something?
come on.... you can figure it out, I am sure.
The power products were being sold long before headphones. The power stuff died when the crash shut down business after business. These chassis models were not portable nor cheap and were attachments to A-V-Home Theater and big screen TV - surround sound systems and CI. Expensive systems compared to iPODs and headphone markets.
-RM
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