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Old 28th October 2013, 11:30 PM   #21
tinitus is offline tinitus  Europe
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toucheŽ

Quote:
Originally Posted by pooge View Post
There is no "signal ground" in a balanced system.

but if you use connectors for the simple SE to balanced convertion there will be a signal ground connected, no ?

he stricly said he would not consider trafos due to budget

that said ...
RCA connectors are always isolated from chassis, and for a good reason, right ?
and besides, XLR also happens to have a 4th 'pin' for chassis connection, and also for a good reason, right ?
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Old 30th October 2013, 01:46 AM   #22
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Quote:
Originally Posted by tinitus View Post
but if you use connectors for the simple SE to balanced convertion there will be a signal ground connected, no ?
The Hot connects to the '+' input
The Return/Shield connects to the '-' input.

Quote:
that said ...
RCA connectors are always isolated from chassis, and for a good reason, right ?
While we still have a large number of retro members. The RCA shell/shield does connect to the chassis.
It took 20 years to get the XLR thing correct, it will take another for the RCA connector.

Quote:
and besides, XLR also happens to have a 4th 'pin' for chassis connection, and also for a good reason, right ?
Well No.
The XLR connector tab/shell is no longer connected in balanced cables. (although it may be connected in chassis connectors)

It's all about what is called the pin #1 problem (even if the connector is numbered differently)

Jim Brown discusses the problem in several papers.

Audio Systems Group, Inc. Publications
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Old 30th October 2013, 02:10 AM   #23
benb is offline benb  United States
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Sound System Interconnection
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Old 21st February 2016, 03:00 PM   #24
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Default good read

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Originally Posted by benb View Post
Hi benb,
Thanks for that,good to keep for a ref!
NS
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Old 22nd February 2016, 11:37 AM   #25
AndrewT is offline AndrewT  Scotland
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Worth reading an003 as well.
Attached Files
File Type: pdf an003(1).pdf (103.3 KB, 32 views)
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Last edited by AndrewT; 22nd February 2016 at 11:41 AM.
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Old 22nd February 2016, 03:22 PM   #26
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HI Andrew,
I need a Volume control for a balanced circuit,it's input will source from AK4393.
On the data sheet it recommends going from bal to SE and putting a pot there and reconverting back to bal to enter the bal amps ,In your opinion is this the best way to get a volume control in a balanced system?
Would a bal B1 do the job? I was considering it and use a switched att with matched smd's to over come mismatch of a ganged pot?
I have read about 2 v is output of AK4393 and that is enough to drive my amps,My system is bal 4 way, 2 bal F5 for highs,2 alph J's for mids,2 aleph's for bass and 2 550Wchip amps to drive 2 Xoc1's 18subs ,I have 2 Ba3's to replace those almost finished to replace chip amps.
Thanks for the links,I'll read it now.....
Thanks,
NS

Last edited by noSmoking; 22nd February 2016 at 03:30 PM. Reason: more thinking,lol
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Old 22nd February 2016, 06:01 PM   #27
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by noSmoking View Post
HI Andrew,
I need a Volume control for a balanced circuit,it's input will source from AK4393.
On the data sheet it recommends going from bal to SE and putting a pot there and reconverting back to bal to enter the bal amps ,In your opinion is this the best way to get a volume control in a balanced system?
Don't bother with my opinion. Read Bruno Putzeys' article and the Thread discussing this method.
Quote:
Would a bal B1 do the job? I was considering it and use a switched att with matched smd's to over come mismatch of a ganged pot?
A B1 would be nearly impossible to keep balanced. Again, read Putzeys.
Quote:
I have read about 2 v is output of AK4393 and that is enough to drive my amps,My system is bal 4 way, 2 bal F5 for highs,
The F5 was never designed to be balanced. Read the F5x, or the balanced version of the F5t
Quote:
2 alph J's for mids,2 aleph's for bass and 2 550Wchip amps to drive 2 Xoc1's 18subs ,I have 2 Ba3's to replace those almost finished to replace chip amps.
Thanks for the links,I'll read it now.....
Thanks,
NS
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Old 23rd February 2016, 12:07 AM   #28
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Thanks for your reply !
Have a GREAT day!
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