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Old 20th October 2013, 07:23 PM   #51
tinitus is offline tinitus  Europe
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noted, thanks

I will try with pseudo balanced RCA to XLR cable

and just have the other inputs as 'optional' with jumper, in case I'm missing a cable, or whatever might happen

time will show if makes any difference

anyway, I have planned to have instrument Jack input on front panel, with a buffer
back panel XLR input is only for extern preamp, or other units
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Old 20th October 2013, 07:36 PM   #52
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I also planned to have a XLR/Jack combo

but that Jack is also balanced
so that will need som caretaking too
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Old 21st October 2013, 06:45 AM   #53
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Quote:
Originally Posted by AndrewT View Post
Is that what Rane and Jensen tell us, when they suggest a converter cable? Keep the balanced for as much as possible. That must include the cable attached to the balanced impedance Receiver.
Andrew, its a single ended signal going into a balanced receiver

I do not see how to 'keep balanced signal for as long as possible'
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Old 21st October 2013, 08:52 AM   #54
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The balanced input receiver is expecting a balanced impedance signal. Use a balanced cable to maintain the balance to as early as the system will allow.
Use the conversion at the output of the unbalanced source.
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Old 21st October 2013, 08:55 AM   #55
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by AndrewT View Post
The balanced input receiver is expecting a balanced impedance signal. Use a balanced cable to maintain the balance to as early as the system will allow.
Use the conversion at the output of the unbalanced source.
yeah, ok ... but it's not getting any balanced signal, either way

sounds very 'theoretical', but I will try it, sure ... but not expecting much difference, if any

if I remember it I will report back about it

thanks
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Old 22nd October 2013, 09:16 AM   #56
tinitus is offline tinitus  Europe
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hmm, I have always found that pseudo balanced single end cables sounded best with shield connecting to preamp

but only tried it with single end to single end, and never with RCA to XLR

but in the linked Rane paper, the shield is left floating

is that what a ground lift switch is doing ?
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Old 23rd October 2013, 10:27 AM   #57
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so, if I insert a mono/instrument jack plug into the balanced XLR/jack combo, it will automaticly short pin 1 and 3

so, a ground lift switch on XLR pin 1 would 'route' the single ended ground to XLR pin 3
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Old 24th October 2013, 01:14 AM   #58
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wow it seems there's a lot of confusion about balanced lines and grounding practices.heaven forbid we start complicating matters with phantom power or A/D on balanced lines and maybe some high speed data too!
i guess i'm prone to mentioning phantom power and ground lifts because i've been there when some overzealous roadie starts flipping ground lifts with audio on and finds the phantom powered mic! many a horn driver has gone to speaker heaven in this circumstance.
when it comes to ground"lifting" anything exercise caution! an improper "ground lift solution" can jeopardize human life!
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Old 24th October 2013, 09:34 PM   #59
tinitus is offline tinitus  Europe
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well, many DIY'ers here couple the chassis and 'signal ground' via a resistor, diode, or thermistor

and some ground lift switches does that in the 'lift' position

but I 'out there' you never know what weird stuff comes your way
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