You have to tell us what sort of 'single ended to balanced cable' you want to use. And or how it will be wired.
If it is the sort that uses XLR pin 2 as input (hot) and combines pins 1 and 3 as the shield, it will simply short the input of the pin 3 side of the ACA. (XLR pin 1 is ground.)
Don't forget too, that if the pre amp is grounded then it is very likely the outer ring of the RCA is also grounded. If that also becomes the XLR pin 3 'Negative' connection, you again short out the pin 3 side of the ACA.
If it is the sort that uses XLR pin 2 as input (hot) and combines pins 1 and 3 as the shield, it will simply short the input of the pin 3 side of the ACA. (XLR pin 1 is ground.)
Don't forget too, that if the pre amp is grounded then it is very likely the outer ring of the RCA is also grounded. If that also becomes the XLR pin 3 'Negative' connection, you again short out the pin 3 side of the ACA.
If I short out pin 3, is that bad?
Would the ACA just amplify the signal on pin 1 then? Would it not still cancel out the inherent distortion of the amplifier, just with a lower signal?
Remember, in simple terms, in the XLR world pins 2 and 3 are both used for input. They are not referenced to pin 1 which is the shield / ground.
If you short out pin 3 you will short the 'white' input RCA to ground via pin 1. You wont do any harm, but the ACA will only amplify on the 'red' channel, so cannot cancel any distortion... (Effectively it will be the same as switching off the 'white' channel.)
To use XLR balanced mode you need a balanced output pre-amp or use a 'module' that converts RCA to XLR balanced. You cannot do it with a cable alone.
If you short out pin 3 you will short the 'white' input RCA to ground via pin 1. You wont do any harm, but the ACA will only amplify on the 'red' channel, so cannot cancel any distortion... (Effectively it will be the same as switching off the 'white' channel.)
To use XLR balanced mode you need a balanced output pre-amp or use a 'module' that converts RCA to XLR balanced. You cannot do it with a cable alone.
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I completed my first ACA 1.8 build earlier this afternoon and have had it up and running for a couple of hours. This thing is nothing short of amazing! For the moment, my set up consists of Klipsch Forte 3s, a BlueSound Node 3 and the ACA. I've been using an Aiyama A07 Class D amp for the last few months. The ACA can't drive the speakers as loud as the Aiyama did, but the sound is warmer and the sound stage is much better. Driving directly from the Node to the ACA my maximum is about 85db at 1 meter, on axis.
I've not been able to find the output voltage of the Node, so I don't know if this is typical output or if I would benefit from a preamp. My normal listening volume is more in the 55-65 db level so I'm not complaining. It's just that the ACA is new to me so I don't know what I should expect after only a couple of hours.
I've not been able to find the output voltage of the Node, so I don't know if this is typical output or if I would benefit from a preamp. My normal listening volume is more in the 55-65 db level so I'm not complaining. It's just that the ACA is new to me so I don't know what I should expect after only a couple of hours.
This may have been covered already but I couldn’t find any information.
how can a Rel subwoofer be correctly hooked up to a pair of Bridged amp camps with the high level adapter?
should the ground wire still go to either positive post? And is the right + (bridged) negative posts for each amp the left and right connections?
how can a Rel subwoofer be correctly hooked up to a pair of Bridged amp camps with the high level adapter?
should the ground wire still go to either positive post? And is the right + (bridged) negative posts for each amp the left and right connections?
A little research is called for. If the AC power cord to the REL doesn't have an earth ground (that third middle pin)
and you are driving 1 REL per 1 channel, then you just hook + to + and - to - and fire it up.
If it has a 3rd pin Earth on the AC or more than 1 channel driving it then you want to look at the REL docs or even call up their technical support to make sure you're ok.
and you are driving 1 REL per 1 channel, then you just hook + to + and - to - and fire it up.
If it has a 3rd pin Earth on the AC or more than 1 channel driving it then you want to look at the REL docs or even call up their technical support to make sure you're ok.
Perfect. Thank you, Mr Pass.
It might might be helpful to add that it will be a single Rel subwoofer connected to a pair of bridged amps, but with an external PSU I built using Rudi’s revision of the CapMX PSU from Jason Keutemann. Each amp board has its own CapMX PSU board with each channel having the grounds tied together. I swapped the power 2.5 x 5.5 mm input with a 4 pin input to separate the power and not using the power switches on the front.
the AC power on the Rel DOES have the earth ground.
thanks for the help on this.
It might might be helpful to add that it will be a single Rel subwoofer connected to a pair of bridged amps, but with an external PSU I built using Rudi’s revision of the CapMX PSU from Jason Keutemann. Each amp board has its own CapMX PSU board with each channel having the grounds tied together. I swapped the power 2.5 x 5.5 mm input with a 4 pin input to separate the power and not using the power switches on the front.
the AC power on the Rel DOES have the earth ground.
thanks for the help on this.
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Hi, two years ago I built the ACA Camp amplifier. Now I would like to build the Aleph J amplifier. In the meantime I am waiting for Aleph J's pcb to be available, I have built the psu. This psu has V+ V- and Gnd. The ACA Camp only has V+ and Gnd. I am wondering if I can use this psu for ACA Camp and if so how to do it.
Thank you
Thank you