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ARSCLIST  June 2014

ARSCLIST June 2014

Subject:

Re: Upgrading Audio Systems

From:

Carl Pultz <[log in to unmask]>

Reply-To:

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

Date:

Wed, 18 Jun 2014 22:13:38 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (52 lines)

On 06/18/2014 03:50 PM, Robert Cham wrote:
> In my new house, presently under construction, there will be surge 
> suppression on the incoming lines, and power filtering on selected 
> circuits.  These include home runs for left an right audio, there will 
> be a separate circuit for digital audio, home theater in the bedroom, 
> and my editing suite.  The surge suppression will likely be LEI, 
> haven't decided yet on power filtering, but am leaning toward 
> isolation transformers.  Comments are most welcome on this one.
>
Yeah! Are you creating a ground-plane (if that's the right term)? Stakes 
and/or wires in the ground?
> It has been my experience that power line garbage and RF noise are the 
> biggest roadblocks to audio quality.  I am living in very rural 
> Virginia, at least partially because of this issue. There will be no 
> wireless devices allowed in the house except "dumb" cell phones.  I 
> spent all morning today planning cable runs for computer networks. The 
> inverters for my solar electric system were chosen largely on the 
> basis of their low sine wave distortion, considerably lower than power 
> company standards. I looked at going down to DC and regenerating an AC 
> signal for audio systems, but enough is enough, even for a geeky 
> engineers house.
>
Dude! Motor/generator!
> The reason for the separate left and right channel power runs id that 
> I have noticed that crosstalk between channels, generally through the 
> power supply, is the biggest enemy of stereo image.  Power amplifiers 
> will be mono blocks, and I'm working on preasmps with separate power 
> supplies for each channel, at the very least separate regulators for 
> each channel.
>
That will be awesome. My studio/hifi is simple - a DAC/Preamp and a 
stereo poweramp. Those and a computer are all that require AC. I run my 
phono preamp off a 12v lead acid battery. Given two dedicated lines in 
the room, I can put the digital on one, the analog poweramp on the 
other, balanced in between.

And with an extension cord snaked to the basement, the computer reaches 
another dedicated line. In the laundry room. I came to this in stages, 
having done the single circuit to minimize differences in chassis 
potential idea for ages. That may be the ticket for tube systems. On my 
SS gear, this sounds much better, particularly with the computer plug 
change. Only problem with that is the soundstage gets unstable during 
the spin-cycle.

> Excessive?  Of course, but this will be my last house, and 
> infrastructure changes are relatively inexpensive when the wallboard 
> isn't up yet.  Now that I'm retired, I will have time to finish audio 
> design projects that have been hanging for for years, at least when 
> I'm not raising grapes, making wine, smoking meats and raising most of 
> our food.  It will be nice to know that subtle changes in circuits are 
> not being swamped by incoming power problems

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