DMP - I2S - DSD. I recommend an additional connection of the masses of both devices

If the DMP is connected to DSD with an HDMI cable, I recommend connecting the masses of both devices with a short cable, preferably pin-1 XLR Digital Output - pin-1 XLR Digital Input. If this has been discussed, I am sorry to discover America for the second time.

Why is this ?

Maybe for a cleaner grounding scheme to reduce rfi?

I think Ted has mentioned to disconnect all connections from transport to dac…when using hdmi …for better sound.

There was a significant improvement in sound quality, the bass gained a lot of precision. DMP with DSD can be connected with an XLR-XLR cable, but only the pin 1 (GND) of both connectors is relevant. I checked the connection with the Coax cable, but it’s not as good as the connection between the XLR connectors.
I have a HDMI WW Platinum Platinum Starlight 7 cable.

Interesting. Thanks for the explanation.

It seems to me that this was a recommendation and until now I only had an HDMI cable connected. I accidentally found that combining the masses of both devices significantly improves SQ. I hosted the Polish PS Audio salesman and he was very impressed.

My system:
P5, DMP and DSD (Windom) with SR Blue fuses. At home I have a special power line for Audio equipment. All power cables are Verastarr Grand Illusion Signature. Active 3-way loudspeakers assembled by me (enclosed enclosure, weight approx. 55 kg, Scan-Speak speakers: beryllium tweeter D2908 / 714000, midrange 18M / 8631T00, woofer 28W / 8878T010), IsoAcoustics Gaia II. Loudspeakers connected with Van den Hul Platinum Hybrid balanced cables. Before the cables at the DSD output I have symmetrical buffers that I have assembled on OPA1632 amplifiers. They have low output impedance, excellent parameters and significantly improve the sound in a system without a preamplifier, even with the best cables .

Sorry for my English. I hope you understood me.


Very nice setup:)
As a Do it yourself fan I’d like to see circuit diagram for the buffers, and wondered what volume (litres) the loudspeakers are?
Sounds like a good system anyways :slight_smile:

…and no problem if you want to keep the details to yourself :wink:

I have mounted so that the signal path is the shortest. Power supply +/- 12 or 15 V. I put on a heat shrink sleeve.
The OPA1632 datasheet can be found on the web. By changing the value of the resistors you can set any gain.

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Still not sure I uderstand. Do you mezzanine you connect 1 single pin xlr cable between dac and transport, and if so did you make the cable yourself ?

Only pin 1 of both XLR connectors should be connected. Preferably a short cable of almost any thickness. I am an electronics engineer, but any soldering iron owner can make such a cable.

I attach photos of my system. On the back of the loudspeaker I have a module with an analog 3-way crossover (24 dB / oct, 180 Hz, 2700 Hz), 3 Hypex NC 500 amplifiers, Hypex SMPS 1200 +/- 85 V power supply. The housing has 45 mm thick walls. The woofer works in a volume of 45 liters. At 40 Hz I had a decrease of 3 dB, but I installed a filter amplifying the lowest frequencies and currently from 25 Hz to 180 Hz the efficiency is in the range of +/- 2 dB.

Much respect - that looks like an excellent job :slight_smile:
I looked at some analogue crossover modules but ended up going with a dcx, for now at least, using regular hifi amps (90s amps are cheap on eBay!) But have been looking at some class D modules to replace them :slight_smile:

So just 1 cable ? From xlr digital to digital ?

Thank you for your interest and trust in me. I enclose a picture showing a cable with stripped connectors. If the DMP is on DSD, the cable can be 20 cm long. The cost of making such a cable is about $ 10. I hope that also in your system will significantly improve the sound.


Has anyone else tried this and confirmed the OP’s findings?

Try this solution. You can connect any cable with XLR connectors. Write how this affected your system’s sound.

@wiesiek - I had some time over the Christmas break so I thought I would try this extra ground between the DMP & DSD. In addition I wrapped the 14ga wire with 0.5in braid to make sure I covered HF GND. I listened for a day back and forth and found zero benefit. I took pics to show the approach.

Furutech XLR connectors w/ braid & 14ga wire.

Very short cable from DMP to DSD.

This had zero affect. However, thanks for the idea, I left it in since this took me a few hours and $75 to implement. More love from the desert!

Thank you for the report. I expected this result, but it was worth trying - here, elegantly.

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@Elk - yeah - thought so myself and had a few calories to expend. All systems are different. Grounding schemes are different and component set up is different. It adds an extra GND so it does not hurt. I thought I would provide feedback to the collective so others think twice. In the end, adding a second GND is not detrimental… hope you are having a great holiday?

I also expected no downside and, as you note, grounds vary so it was wroth a try.

I do particularly enjoy how pretty you made the setup.

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