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This one is.... ;)

Mark, My main PCB is rev03 as well, what a relief! (452-01-03). Looks like I picked up an original shipped item that had been in long term storage at the dealer. I didn't order direct from Pro-Ject Australia as they were ~A$100 more in price. It doesn't matter to me, I have had great fun...

Hi Mark. How interesting, I have rev01 of the potentiometer board and you have rev02. My DS3 B was purchased in March this year, and must have been 'New Old Stock' by then. I was surprised that this earthing issue existed in the DS3 B, and I guess so did Pro-Ject......eventually. I wonder...

Hi Mark, trying to limit the USB packet noise is a continuous issue. with the Xonar U7 MkII it is certainly breakthrough between the digital and analog sections of the USB interface as it is still there with the Xonar inputs shorted and the Xonar in a cake tin! The Xonar is only a >A$200 and I...

For those who are interested, and others with various levels of EMI OCD! I found an EMI leakage point in the DS3 B mechanical design and addressed it. From the start I’ll state that I can’t hear a difference (because the levels are so low) but I can sure measure a difference. I use the DS3 B...

Hi. In my measurement system the 8khz signal is USB packet noise generated within the USB sound card itself (ASUS Xonar U7 MkII). It's not generated in the phono amplifier itself. This 8khz signal has strong harmonics at 16khz and 24khz. I can minimise the amplitude sometimes by switching...

This is the output of the DS3B on my measurement system using the standard switching power supply, and no external LC filter network to clear the 24khz switching noise. Again, I have used a long REW FFT Length and a very large number of samples to discount random noise and reveal the persistent...

For those that are interested this is what the spectrum of the stock DS3B 18v switching power supply looks like on my simple measurement system. The switching frequency of 24khz is prominent along with the harmonics up to the 96khz limit of the sample. The measurement system is basic but...

I have the DS3B and off course have had the covers off. The circuit board, near the center in the analog phono amp location, has three test points labeled: Grn, +16 and -16; indicating that a split supplies of 16 volts are in use (a total of 32 volts rail to rail). While these test points are...

The DS3B has internal power supply circuits to generate positive and negative 16volt rails for the analog sections, and other power curcuits to generate the logic and relay control voltage supplies. The external 18vDC supply just provides the raw power input.

So am I.

This is a very informative image, and I think a similar 10Khz signal and broadband capture test would be of interest to some for Class D reviews. I am a Class D fan with a pair of March Audio P501 mono-blocks which are fantastic, but I am also curious; however I don't have the gear to conduct 1...

Thanks for the feedback. I'm looking forward to this thing being out in the wild! I will have to contain myself though, having already updated from a March Audio 1ET400 to the new March Audio 1ET7040.

Well, the question is 'what is a 1ET9040BA'

My March Audio P501 monoblocks incorporating the 7040 have been in service now for 4 months (see post #121). No issues in the period to report. Very happy with the overall system which is very ASR-ish: Topping D90SE, Pre90 + Extender. Denon direct drive turntable that I purchased new in 1980...

I know, but still loving it. It would be interesting to see if there is any measurable difference with the new firmware, especially high DSD rates at 128 and 256. Archimago suggested in his review and detailed measurements of the D90SE (using the E1DA Cosmos ADC) that there was room for...

New firmware updated. Sounds better, snappier and improved micro details. I know the technical reasons why that is unlikely, and many may respond in that frame, but that is what I'm hearing. If I'm deluding myself then I am really enjoying the delusion. I have a resolving system with a D90SE...

The front power switch on the P501 operates as expected, fast and confident action and no finicky operation experienced in the last two weeks.

I have an interesting comparison of the two Purifi cards side-by-side. The 7040SA is noticeably larger and it also has 6 power supply capacitors per rail rather than the 400A's 4 capacitors, so a lift in the on-board current reservoir, which coupled with the March Audio claimed increase in power...

I haven't had a peek inside, thought I would leave it to a reviewer. I can confirm the new touch power switches work great. I was annoyed with the old P451 solution and resorted to using a simple trigger set up (9v battery in a plastic box with a switch) which worked fine. Having played the...