Using Flatcap 2X for 2 Pre amp supply : NAC-62 and NAC-112X, How about the connection?

You can only use the Flatcap to power up one preamp at the time.

So you can choose to power the 112X or the 62, not both silmoustanely.
The remaining preamp can be powered from your poweramp either Nap 140 or 150X.

Just use the diagram from manual, its quite simple (once you know)

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can I combine 2 preamps and 2 power amps at the same time while adhering to the 5 pin DIN to Pre amp (62,112X) and 4 pin DIN to Power Amp (140,150X) rules
of course I will turn on each system separately and will not be simultaneously, but I combine at the same time

Yes you’re right

So my conclusion, Flatcap 2X is only useful for NAC-112X and not for NAC-62 if I combine it together in the sense that 1 Flatcap 2X can only supply NAC-112X?

You can use a Flatcap 2X for any of the two preamps, as stated above either Nac 112x or Nac 62.

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I have just made connection diagram , is it correct ?

Red Line describe Power Out to every Preamp (NAC-62 and NAC-112X)
Blue Line describe Signal Out to every Power Amp (NAP-140 and NAP-150X)

System 1 (NAC-112X, NAP-150X) have own stereo speaker
System 2 (NAC-62, NAP-140) have own stereo speaker

of course, I will only operate 1 system at a time, not both

The mains cord that I plug into the mains is only Flatcap 2X?
while the mains cord of each NAP-150X and NAP-140 did not I plug into the mains?
Is this true?

I’m fairly sure the Flatcap 2 has the second supply at 22V. The Flatcap 2X has the second supply at 24V.

The second supply of the Flatcap 2 was optimised for the CD5 - which I think was tested by Naim to sound better with 22V cf. 24.

Edited to add links (both from same thread actually): CD5 power supply - #2 by Richard.Dane
CD5 power supply - #9 by Richard.Dane

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Just use the Flatcap with the 112/150, it’s a nice match. Wait until you can get hold of a Hicap for the 62 then both systems will have the PSUs they deserve.


Notwithstanding recommendations above. As I understand it, and I really do not have first hand experience of separate pre/power, power and signal have to be handled by an associated pair of connectors. You should not just use one of the pair for power only, as I think the OP is suggesting in one of the pics

The first connector (e.g. socket 1) of the associated connector pair takes power from the PSU to the connected box and also receives the connected box’s signal output. The second connector of the pair on the PSU (e.g. socket 2) then takes signal to whatever you’re wanting to take the output from the box you’re powering, to.

The 2X had two “sets” of these connectors, the first having one signal in, 3 signal outs (allowing routing of the single source on socket 1, to 3 destinations), the second set just having a single signal out (allowing routing of its source on socket 5 to a single destination)

I think the line the OP has from the NAC62 to the 2X (socket 5) will be taking signal output (hm, attenuated by the volume pot… maybe that’s the issue with using the 2X here, as it was intended for a line level output of a CD player?) to the 2X, but that output will not find its way to socket 2 or socket 3 as the diagram “hopefully” depicts.

But, I really should double caveat this!!! Maybe even triple caveat it X)

…and reading back up the thread, manual seems clear the second set of connectors only listed for source components, not powering a preamp

…also deleted some stuff I wasn’t sure about!

I already got the clarity, so it’s like this: NAC-112X, NAP-150X, and Flatcap 2 are indeed 3 series, 1 set, if there is a CD, the pair is CD5i, while the NAC-122X, NAP-150X and Flatcap 2X are 3 series also, if there is a partner CD5X. Now the difference in supply voltage from Flatcap and Flatcap 2X is, if Flatcap 2X = 4 x 24VDC, where the first 2 x24VDC is for supply to NAC-122X while the second 2x24VDC is for CD5X because CD5X supply is 24VDC. While Flatcap 2 = 2 x 24VDC and 2 x 22VDC, where the first 2 x 24VDC is for supply to NAC-112X and 2 x 22VDC for CD5i because CD5i supply is 22VDC.
So if you want to supply to 2 Pre-Amps, the conclusion must be to use Flatcap 2X, because all PreAmp Naim uses 24VDC supply both CB, Olive and Classic

is my conclusion correct?

how about my 2nd wiring opinion like this

Confused :crazy_face:

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You can’t power a CD5i with any external power supply

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No. The signal must go via the power supply. Just forget wiring two preamps to a Flatcap. Use it on one or the other or get a Hicap for the 62.

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Quite right.

Primemerkava, whatever you do, never connect a Naim power amp directly to a pre-amp if the pre-amp is also being powered by a power supply, otherwise you end up with two supplies, impaired performance and overs-stressed regulators, which may well cause premature component failure.

As previously written, you shouldn’t try powering two pre-amps from the same power supply. It’s not designed that way.


sorry, CD5 I meant
thank you for correcting

Yes, I think I’d better left every set to work alone

NAC-62/NAP-140 and searching for CB Hicap
NAC-112X/NAP-150X packed with Flatcap, sorry not Flatcap 2 as I mentioned above

Just to make it abundantly clear:
a flatcap or hicap gives power (electricity) to the nac (preamp) through a snaic 5, and gets back the preamp signal through the same snaic 5.
the flatcap or hicap then passes on the same preamp signal from the nac to the nap (power amp) via a snaic 4.

When a flatcap is powering a cd player, it is just supplying power (electricity); the source signal from the cd player doesnt go anywhere other than direct to the preamp via another interconnect.

Hence a flatcap can power a single preamp and/or a single cd player, but no other combination.


thank you so much to make a clear conclusion

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