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ARSCLIST  August 2016

ARSCLIST August 2016

Subject:

Re: Fwd: [ARSCLIST] : Fancy speakers? Check. Sub-woofer? Check. Electric Utility Pole?

From:

Corey Bailey <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Mon, 15 Aug 2016 23:44:20 -0700

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (139 lines)

Dennis is correct:
The incoming power from the outside world is extremely dirty and needs 
aggressive treatment. The key is to have plenty of current available. 
About a 2-to-1 ratio (1/2 stress engineering) is desirable and the 
treatment starts from there. Having plenty of current is the only 
possible reason I can think of that would justify a separate power drop. 
Regeneration is a valid plan if your needs are modest. However, it's not 
cost effective for large installations.

As Ellis Burman pointed out, commercial recording facilities use 
isolation transformers. I have built several studios and the electrical 
feed starts with a center tapped, isolated, 3 phase transformer. The 
system is branched out, further filtered and isolated from there. The 
end result needs to have a common, but separate, ground from building 
power.

Cheers!

Corey
Corey Bailey Audio Engineering
www.baileyzone.net

On 8/15/2016 5:04 PM, Dennis Rooney wrote:
> ---------- Forwarded message ----------
> From: Gary A. Galo<[log in to unmask]>
> Date: Mon, Aug 15, 2016 at 7:00 PM
> Subject: Re: [ARSCLIST] : Fancy speakers? Check. Sub-woofer? Check.
> Electric Utility Pole?
> To: Dennis Rooney<[log in to unmask]>, Seth Winner<
> [log in to unmask]>, _Steven<[log in to unmask]>
>
>
> Hi Guys,
>
>
> These folks are not crazy when they talk about the contaminated power line.
> If you've ever looked at it on a distortion analyzer, it's appalling. But,
> I wonder if getting your own pole and transformer solves the entire
> problem. There's a lot of high-frequency noise on the power line, for sure,
> and there's no question that it audibly degrades the performance of most
> audio equipment. But, an equally-serious problem is  the flat-topping of
> the waveform. The AC power line is supposed to be a sine wave, but it
> always shows visible flat-topping, like an audio amplifier being driven
> into clipping. The flat-topping is caused by all the non-linear loads
> connected to the AC line. I seriously doubt that even having your own
> transformer would get rid of this, since the transformer would have to have
> a narrow enough bandwidth to begin attenuating at the 3rd harmonic in order
> to do so. Having your own pole and transformer will isolate you from your
> neighbors, and all of the noise generated by their appliances, computers,
> etc., but I seriously doubt that it will get rid of the flat-topping.
>
>
> I converted from conventional AC line filtering to AC regenerators about
> five years ago. The regenerators are made by PS Audio - they generate an
> entirely new 60 Hz sine wave and step it up to 120 VAC. I have three of
> them - one on each mono power amp, and one on my low-level equipment
> (preamp, digital player, D/A converter).
>
>
> The regenerated AC is free of both flat-topping and the high-frequency
> noise that plagues the AC line. I've measure 3 to 5 % harmonic distortion
> on the AC power line. The output of the regenerators has less than 1% THD
> even under load.
>
>
> To me, AC regeneration is a saner and, I think, ultimately more effective
> solution to the problem than getting your own pole.
>
>
> Feel free to post my comments on the ARSC Listserve, which I am not on. I'm
> sure many people think that this topic is not worthy of serious discussion,
> but they're dead wrong.
>
>
> Cheers,
>
> Gary
>
>
> Gary Galo
> Audio Engineer Emeritus
> The Crane School of Music
> SUNY at Potsdam, NY 13676
>
> "Great art presupposes the alert mind of the educated listener."
> Arnold Schoenberg
>
> "A true artist doesn't want to be admired, he wants to be believed."
> Igor Markevitch
>
>
>
> ------------------------------
> *From:* Dennis Rooney<[log in to unmask]>
> *Sent:* Monday, August 15, 2016 1:57 PM
> *To:* Gary A. Galo; Seth Winner
> *Subject:* Fwd: [ARSCLIST] : Fancy speakers? Check. Sub-woofer? Check.
> Electric Utility Pole?
>
> Gentlemen,
>
> I read the story in the link this morning. You'll enjoy it.
>
> Ciao,
>
> DDR
>
> ---------- Forwarded message ----------
> From: Carl Pultz<[log in to unmask]>
> Date: Mon, Aug 15, 2016 at 10:58 AM
> Subject: Re: [ARSCLIST] : Fancy speakers? Check. Sub-woofer? Check.
> Electric Utility Pole?
> To: [log in to unmask]
>
>
> Thanks Steve. Love it!
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]] On Behalf Of Steve Ramm
> Sent: Monday, August 15, 2016 8:57 AM
> To: [log in to unmask]
> Subject: [ARSCLIST] : Fancy speakers? Check. Sub-woofer? Check. Electric
> Utility Pole?
>
> Here is something from  WSJ.com that might interest you: Fancy speakers?
> Check. Sub-woofer? Check.  Electric Utility Pole?
>
>
>
> http://on.wsj.com/2brdtNH
>
>
> Steve Ramm
>
>
>
>    

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