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Old 24th March 2009, 05:57 PM   #471
troystg is offline troystg  United States
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Not at all a dumb question.

It is BETTER to run separate umbilicals.

The two cases should be at the same ground potential.

I would suggest (MY SUGGESTION) that you use the Neutric power con plugs or 4 pin Mic plugs. Use a shielded cable for the umbilicals. Connect the shield to chassis on both cases and the chassis to Earth grnd on the Pwr enclosure side.

http://www.parts-express.com/pe/show...number=090-542

EDIT: After looking at these I would not use them as they only have 3 conductors and would require a separate wire to Earth ground the chassis's.

http://www.parts-express.com/pe/show...number=092-286


Then both chassis will be Earthed properly and you can use a 3 conductor cable to carry each channels ac and pwr grnd.

Remember power ground and Earth ground are NOT the same.
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Old 24th March 2009, 06:03 PM   #472
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it will be far simpler to build a true monoblock, each box containing just one channel with integrated PSU and amplifier.
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Old 24th March 2009, 06:06 PM   #473
troystg is offline troystg  United States
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Quote:
Originally posted by AndrewT
it will be far simpler to build a true monoblock, each box containing just one channel with integrated PSU and amplifier.

Andrew is right... If you have 2 cases make true mono-blocs.

Only reason I could see NOT to would be if the cases were different and didn't match.
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Old 24th March 2009, 06:33 PM   #474
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I agree with the true monoblock approach. There is nothing to be gained in performance by putting both xformers in their own case and both amps in another. In fact, besides the additional expense of connectors and umbilicals, it is possible that such an arrangement will introduce its own set of problems. I have built my monoblocks with the transformer very close to the power supply side of the amp boards, and there is no noise whatsoever.

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Old 24th March 2009, 06:37 PM   #475
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Quote:
Originally posted by troystg
Not at all a dumb question.

It is BETTER to run separate umbilicals.

Why?
Is this just because of the more readily available 3/4 conductor connectors (compared to 7-conductor?).
Should each transformer have its own mains cable as well?

Electrically, I don't see why the two transformers couldn't just be put in parallel if you need the VA rating increased. Use a single low voltage AC umbilical and feed both boards?

I agree with Andrew and troystg that if you are going to have 2 cases, keeping the transformers with the amps makes sense- if the cases match .

John
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Old 24th March 2009, 06:53 PM   #476
troystg is offline troystg  United States
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Quote:
Originally posted by VictoriaGuy

Why?
Is this just because of the more readily available 3/4 conductor connectors (compared to 7-conductor?).
Should each transformer have its own mains cable as well?

Electrically, I don't see why the two transformers couldn't just be put in parallel if you need the VA rating increased. Use a single low voltage AC umbilical and feed both boards?

I agree with Andrew and troystg that if you are going to have 2 cases, keeping the transformers with the amps makes sense- if the cases match .

John

No two trafo's are identical. They will vary in voltage and current. You could parallel them but it is not ideal.

A single umbilical cord would have parallel conductors. Channel separation and "power modulation" would be compromised.

The whole point of mono-blocs are complete separation all the way to the primary AC line.

A single AC input, fuse and pwr switch then complete separation there after is best if you are constrained to a single chassis.
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Old 24th March 2009, 07:33 PM   #477
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Quote:
Originally posted by troystg
Not at all a dumb question.

It is BETTER to run separate umbilicals.

The two cases should be at the same ground potential.

I would suggest (MY SUGGESTION) that you use the Neutric power con plugs or 4 pin Mic plugs. Use a shielded cable for the umbilicals. Connect the shield to chassis on both cases and the chassis to Earth grnd on the Pwr enclosure side.

http://www.parts-express.com/pe/show...number=090-542

EDIT: After looking at these I would not use them as they only have 3 conductors and would require a separate wire to Earth ground the chassis's.

http://www.parts-express.com/pe/show...number=092-286


Then both chassis will be Earthed properly and you can use a 3 conductor cable to carry each channels ac and pwr grnd.

Remember power ground and Earth ground are NOT the same.




wich other connector brand will be ok to use? i want to see the same product but from another brand or at least with better/worst specs. I would order like 100 of these, i want to use it in all my amps .)
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Old 24th March 2009, 07:50 PM   #478
troystg is offline troystg  United States
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I don't know if there was a "brand" associated with the Mic plug / jack, and as for the Nuetrik they have other companies selling knock-offs.

Personally for low current applications (<10 amps) I like the mic plugs...
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Old 24th March 2009, 08:30 PM   #479
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Sounds like the 'true' monoblock is the way to go.

Thanks for all the replies.
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Old 24th March 2009, 08:40 PM   #480
troystg is offline troystg  United States
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Quote:
Originally posted by sandbasser
Sounds like the 'true' monoblock is the way to go.

Thanks for all the replies.

Is riverside anywhere near Steve at apex.jr?

If so he has some twisted 3 conductor shielded silver plated Tefl*# wire that makes very good pwr cable for low current devices.

If I recall correctly it is 16 or 18/3 with a braided shield. And mono-bloc Rev_C boards are not going to draw that much from the mains..
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