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ARSCLIST  June 2014

ARSCLIST June 2014

Subject:

Re: Upgrading Audio Systems

From:

Robert Cham <[log in to unmask]>

Reply-To:

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

Date:

Thu, 19 Jun 2014 15:24:34 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (157 lines)

Take a close look at the sine wave distortion of 
your UPS.  Many are not sine waves at all. 
Computers may not care, but analog electronics do.

Responding to another thread, back in the '80s, 
Straight Wire Audio made a balanced phono preamp. 
It required rewiring your tonearm, but it was a 
godsend for radio stations whose studios were in 
high RF environments.

Think about it, there are two wires for each 
channel on a phono pickup.  One channels low is 
generally grounded.  that;s usually a strap that 
can be removed.  Then you can feed it into a 
balanced mic preamp, and all you have to deal 
with is the RIAA curve.

Bob Cham



>Do people ever use dual-conversion online UPS's 
>for the purpose of power-line isolation for 
>audio equipment?
>
>The power is constantly going to the battery and 
>running off the battery being reconverted back 
>to AC.  Thus isolating the equipment from any 
>fluctuations from the power mains.
>
>It's what I use for my computer room servers, 
>and so far (knock on silicon) I haven't lost a 
>power supply yet.
>
>Depending on the size they can produce some heat 
>and noise (from the fans cooling the rectifiers, 
>etc) but if someone's considering rewiring an 
>entire house/studio perhaps an online UPS would 
>work as well for less investment, maybe in a 
>nearby closet, etc.?  Not an electrical engineer 
>so can't really compare the power they're 
>outputting to the other options mentioned, but 
>seems like it could be a reasonable alternative 
>if power-line isolation is a serious concern.
>
>Arthur Gaer
>[log in to unmask]
>
>Senior Systems Manager
>Harvard University
>Department of Mathematics
>Science Center
>1 Oxford Street
>Cambridge, MA 02138
>
>
>On Jun 19, 2014, at 11:19 AM, Tom Fine <[log in to unmask]> wrote:
>
>>  I'm with Lou about powerline hash. You guys 
>>with troubles might want to swap out some of 
>>the "high end" components and see if they are 
>>faulty designs at high prices. In the 
>>professional audio world (where good gear 
>>doesn't come all that cheap, as a matter of 
>>fact), proper shielding and grounding are a 
>>given and otherwise the gear acquires a bad 
>>reputation. A properly grounded and shielded 
>>piece of equipment should reject powerline and 
>>RFI noise completely. I also question whether 
>>some "high end" cables are the problem? I never 
>>noticed any technical tests with the "reviews" 
>>of the fancy wires, and manufacturer claims are 
>>mostly rooted in hooey rather than science, 
>>with any semblence of scientific proof rarely 
>>provided.
>>
>>  Bottom line, a modern audio system shouldn't 
>>need a crazy dedicated power plant unless there 
>>are regular fluctuations in power line 
>>frequency and regular spikes and dips in 
>>voltage. I'm not underestimating the 
>>incompetence of power companies, these 
>>situations are definitely possible. It's also 
>>possible to have insurmountable hash, for 
>>instance in a space shared with an industrial 
>>welding company. But it's not a common problem.
>>
>>  -- Tom Fine
>>
>>  ----- Original Message ----- From: "Lou Judson" <[log in to unmask]>
>>  To: <[log in to unmask]>
>>  Sent: Thursday, June 19, 2014 10:10 AM
>>  Subject: Re: [ARSCLIST] Upgrading Audio Systems
>>
>>
>>>  Ya know, when I sit in my van listening to 
>>>music, I use the car stereo, not the garage 
>>>hifi. Besides, how can you use the garage 
>>>stereo when it is raining and the windows are 
>>>up? And if it is raining in your garage, close 
>>>the washer lid.
>>>
>>>
>>>  But what would I know. My entire system 
>>>including computers runs on a single outlet, 
>>>and never a noise I don't want.
>>>  <L>
>>>
>>>  On Jun 19, 2014, at 7:11 AM, Shai Drori wrote:
>>>
>>>>  You guys are way off. You need to have your 
>>>>repair man make the spin cycle go only 
>>>>counter clock wise in the northern 
>>>>hemisphere. Gheez, do I have to teach you 
>>>>everything?
>>>>  Shai
>>>>   19/06/14 1:05 PM,  Carl Pultz:
>>>>>  I've tried fabric softener to enhance 
>>>>>liquidity, but I prefer the real thing - 
>>>>>EL-84s. Seriously, I have a home-brew tube 
>>>>>amp for a system in the garage. It's nice to 
>>>>>have reference to old-school hifi sound 
>>>>>while having Benchmark/Bryston/Raal-Accuton 
>>>>>modernity too. Reinforces what the guys were 
>>>>>saying on the Headroom thread.
>  >>>>
>>>>>  On 06/18/2014 10:21 PM, Frank Strauss wrote:
>>>>>>>  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.
>>>>>>
>>>>>>  Hi Carl-Have you thought of trying 
>>>>>>different detergents?  I can't play an
>>>>>>  lp during the spin cycle.  I'm trying to get my wife to take the clothes
>>>>>>  down to the stream and beat them with a rock.
>>>>>>
>>>>>>
>>>>>
>>>>
>>>>  --
>>>>  Cheers
>>>>  Shai Drori
>>>>  Timeless Recordings
>>>>  [log in to unmask]
>>>>  Δ
>>>>  ݓ¯
>>>>  Ϙ¯”ӯݘ“ȓү8-35
>>>
>
>!DSPAM:639,53a33245225291644332558!

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