Do all switching amps generate RFI?

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Midnite Mick

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Re: Do all switching amps generate RFI?
« Reply #20 on: 28 Sep 2006, 03:34 am »
Yes I am the bl8's.  Definately more shielding than my magnet wire :)

Mike

Kevin Haskins

Re: Do all switching amps generate RFI?
« Reply #21 on: 28 Sep 2006, 04:58 am »
I doubt shielding is going to make any difference.  Once you let the cat out of the bag its tough to get him back in there.   Consider this.... even if you could prevent the speaker cable from emitting RFI what would keep internal wire, voice coils etc...    Its really an unsolvable problem if you don't take care of it at the source. 

Kevin Haskins

Re: Do all switching amps generate RFI?
« Reply #22 on: 28 Sep 2006, 05:14 am »
Here is my suggestion for a rather simple way to test for RFI radiated from the speaker wires. Buy a small portable AM/FM radio and check for AM and FM bandwidth interference by holding the radio near the speaker wires while playing music through the amp.
Scotty
Lastly, Mr. Haskins I appreciate your regard for the consumers and professionalism in the way you do business.  I wonder how your amp modules compare to the Nuforces as these type of amps appeal to me more than the SS monsters.  I feel like I am tending to lean more to the DIY in audio like the rest of the other fields that I have always done myself (maybe I am just cheap :thumb:)I am looking forward to the completion of the Exodus 2641 kit as I am getting close (finally).

I hope this thread continues so I can try to put some of the pieces together and come away with a new understanding (wish I knew more about electronics - would read more but soooo many projects on the go and in mind)

Thanks,
Mike

Thanks for the kind words.   Get those 2641s done!   

There are plenty of people that have done comparisons between Hypex & other Class D solutions.   Just keep digging......    My own opinion is fairly obvious.  :-)    The main advantages of the UcD designs is that their frequency response doesn't vary with load and their distotortion spectrum doesn't  change much with output level.   The rest of the UcD advantages have to do with design skill at the board level.   Bruno is just better at laying out the PCB and making the right layout and component choices to minimize emissions.   He is just a better engineer and understands the design choices better than our competition. 

Many of the Class D solutions use switching power supplies also.   Once again, there is nothing wrong with a properly designed SMPS but they are a potential noise problem in poor designs.    For me.... it was just easier to avoid the potential design hurdles and use a more traditional transformer/rectifier/capacitor bank supply.   The downside is weight, cost and size.   None of those are that big of a concern with high-end audio.   In fact a hefty amplifier is often considered a GOOD thing.   It keeps that 1" thick garden hose power cord from lifting your amp off the rack.  ;-)

Midnite Mick

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Re: Do all switching amps generate RFI?
« Reply #23 on: 28 Sep 2006, 10:16 am »
Yeah, if there is one thing that I cannot stand its amp tilt resulting from a heavy power cord :)

Mike

Occam

Re: Do all switching amps generate RFI?
« Reply #24 on: 28 Sep 2006, 01:07 pm »
... Second poster, no need to hold back.....
Thanks,
Mike
Its more an issue of :deadhorse:
No one would ever accuse me of holding back. If you're willing to slog through the purposeful misdirection, you'll find this of interest as the 2 switching amps discussed are specifically the Hypex and NuForce -
http://www.audiocircle.com/index.php?topic=26197.0

and as to the specific switching ps under discussion -
http://www.audiocircle.com/index.php?topic=31560.0
http://www.audiocircle.com/index.php?topic=27562.0

'Nuff said....

FWIW,
Paul



macrojack

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Re: Do all switching amps generate RFI?
« Reply #25 on: 28 Sep 2006, 01:12 pm »
If you like the idea of digital amplification, consider Red Wine Audio. Vinnie Rossi makes an incredible sounding integrated amplifier that puts out a stiff 30 watts from battery power. No AC grunge, no humming and all of the advantages of Class D: compact, light weight and no heat.
You can find Red Wine in the manufacturers circle.
6moons.com has declared the Signature 30 to be among the 3 best sounding solid state amps ever made.

Midnite Mick

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Re: Do all switching amps generate RFI?
« Reply #26 on: 28 Sep 2006, 10:37 pm »
Thanks Paul, alot of interesting information there.

Thanks for the suggestion Macrojack

Mike

Dan Banquer

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