Rel stampede speakon connection?

[the_doc735]

Rel stampede speakon connection?

Now my new Sophia Electric 91-01 300B monoblocks require the speakon cable to be connected to the left/right + speaker posts, and the negative core to be connected to the earth post on the pre-amp, "BUT!" ~ I don't have a pre-amp!

Could I connect the negative core to the Cary dac (earth) chassis instead?

thanks!

20314

[farflungstar]

I've never heard of that before, not on a monoblock. Are you sure? I might be ignorant of course.

Sure someone will know - but I'd wait for advice....

[the_doc735]

I've never heard of that before, not on a monoblock. Are you sure? I might be ignorant of course.

Sure someone will know - but I'd wait for advice....

this is shown in the Rel Stampede user manual, page 11/12 but I cannot attach the file? (maybe too big), however it is online!

cheers!

https://www.manualslib.com/manual/140009/Rel-Acoustics-Stampede.html?page=11#manual

[Barry]

I suspect the black and green wires are there simply to provide a pallitive measure of shielding. I would either ignore them, or connect them to a mains earth (such as the metal work of your DAC).

[farflungstar]

It says when using high powered connection to connect ground to ground of 1 ground connections on amplifier but not to both - nothing about preamp - or are you connecting it differently?

[the_doc735]

I suspect the black and green wires are there simply to provide a pallitive measure of shielding. I would either ignore them, or connect them to a mains earth (such as the metal work of your DAC).

cheers, this is what I would think to some degree!

[the_doc735]

It says when using high powered connection to connect ground to ground of 1 ground connections on amplifier but not to both - nothing about preamp - or are you connecting it differently?


20316

...diagram shows pre-amp?

[farflungstar]

Sorry I was looking at the integrated in the link.

[the_doc735]

Sorry I was looking at the integrated in the link.

:lol: never mind!

[the_doc735]

I suspect the black and green wires are there simply to provide a pallitive measure of shielding. I would either ignore them, or connect them to a mains earth (such as the metal work of your DAC).

Yes, decided to get this grounding post for the back of the DAC:
https://www.hificollective.co.uk/components/cardas-acbp-s-single-earth-post.html

[Barry]

Seems a lot of money - why don't you simply use one of the screws on the back of your DAC?

[the_doc735]

Seems a lot of money - why don't you simply use one of the screws on the back of your DAC?

...they are far too small and it wouldn't be a good connection.

Cheers!

[AlexM]

...they are far too small and it wouldn't be a good connection.

Cheers!

Why not use the negative terminal of one of your power amps? that is how I use the high-level input to my sub although I do have a stereo power amp chassis. I assume that your mono power amps will have identical earth resistance if they are connected to a common spur socket or power strip?

[the_doc735]

Why not use the negative terminal of one of your power amps? that is how I use the high-level input to my sub although I do have a stereo power amp chassis. I assume that your mono power amps will have identical earth resistance if they are connected to a common spur socket or power strip?

You would need to ask REL, they do not specify this method of connection for monoblocks! You're speaking to the wrong person i.e. I do not know the reason for this, please let me know what REL say to this (your) enquiry? Thanks!!

[AlexM]

I guess the preamp is assumed to be the reference ground of the system, Ie all of the source components and the power amp are grounded via the preamp so les possibility of a hum loop. If you just connect it to the negative terminal on one of the power amps it will probably be fine. If it hums then back to plan a, otherwise leave it alone

Sent from my ONEPLUS A3003 using Tapatalk

[the_doc735]

I guess the preamp is assumed to be the reference ground of the system, Ie all of the source components and the power amp are grounded via the preamp so les possibility of a hum loop. If you just connect it to the negative terminal on one of the power amps it will probably be fine. If it hums then back to plan a, otherwise leave it alone

Sent from my ONEPLUS A3003 using Tapatalk

Yes, I think yours is a good analysis Alex. On the monoblocks, the negative speaker terminal is not connected to the mains ground pin (on the IEC)! However, the casing /chassis of the DAC is connected to the mains ground pin (on the IEC) :) ..which I have double checked with a multi-meter! I think your analogy of the pre-amp being (Acting as) the ground reference of the entire system therefore applies equally to the (stereo) DAC?
Cheers!

[AlexM]

The signal ground is just a zero reference for the output stage and may or may not be connected to the earth connection or chassis ground. I suppose there is a potential for two mono amps to have a different signal ground potential and for there therefore to be an offset between the amps. In practice I'd suspect not, but suck it and see

Sent from my ONEPLUS A3003 using Tapatalk

[the_doc735]

So, here is the ground post fitted (neatly):

20387

20388

[the_doc735]

I suspect the black and green wires are there simply to provide a pallitive measure of shielding. I would either ignore them, or connect them to a mains earth (such as the metal work of your DAC).

not palliative!! ~ makes a huge hum when they are ignored! (unconnected).