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Some insights on the MiniDSP SHD


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  • 5 weeks later...

Just beautiful report i'm going to buy a SHD (i own a SHD Studio with RME ADI 2 PRO) to simplify my setup.

I'm curious to know if you notice some improvement changin with a Linear PSU...

Did you try also as pre-ampli section?

Regards.

Ciao Stefano.

[br]Lumin T1 - Transrotor Darkstar - McIntosh MA7000 - Synology NAS - Magnepan 1.7 - PS Audio P10 Power Plant.

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59 minutes ago, smolteni said:

Just beautiful report i'm going to buy a SHD (i own a SHD Studio with RME ADI 2 PRO) to simplify my setup.

I'm curious to know if you notice some improvement changin with a Linear PSU...

Did you try also as pre-ampli section?

Regards.

Thanks! I have not managed to do the linear power supply mod just yet. Life has been far too busy! 

 

Yes, the unit is used as a preamp powering my DIY Neurochrome power amplifier. The volume control is great and the remote for this works perfect, giving the ability to switch between Dirac on/off and 4 profiles on the fly. Though, I suspect this is the same as the Studio. 

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Yes is the same SHD Studio.

Thank you for your reply, and if you replace the PSU please share your results.

If i understood well the unit need 2 separate power:

 - 1 24V 5A

- 1 5V

How about connector? Are simple to find? Is it better to sold directly to the board?

Regards.

Ciao Stefano.

[br]Lumin T1 - Transrotor Darkstar - McIntosh MA7000 - Synology NAS - Magnepan 1.7 - PS Audio P10 Power Plant.

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The PSU is 85W without the heatsink, so it should mean 24V 3.5A, which should easily be possible with supplies like these:

https://www.ebay.com/itm/100W-Ultra-low-Noise-100VA-LPS-R-core-Linear-power-supply-DC-5-24V-Optional/133061111162

 

And then, yes, a 5V supply, which are also easily available. I've been following the threads on Allo's new 5V supply, Shanti, and reports are terrific. 

 

As for connector, both the 24V as well as 5V is provided through a harness. I would recomment keeping those intact and making your own harness end-point for the supplies. Note that the 24V supply is dual, so either you jumper the positives and negatives to supply them from a single 24V source, or you find a dual 24V source (it may be designed in dual mono, who knows). I suspect the former is simplest and best though.

 

I recently acquired a Micromega M150, so sold the MiniDSP, so sadly no more experiments from me.

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On 7/15/2019 at 7:43 AM, AbsolutK said:
  • Limited to 1 Khz, things were much better. Better control over bass. My 44 Hz peak is happily tamed.
  • Note: Room Correction addresses the speaker/room combination, and it addresses all issues at once. You may have liked some of these characteristics, but there is no way to isolate them without either advanced analysis, or trial and error. In my system, the bass sounded drier. I'm trying to re-insert some of the peaks to see if I can get that "moisture" back and will also try limiting the correction to 500 Hz.

 

Brilliant  write up.

 

Is limiting the DSP to a certain range easy?

 

Could you show a screenshot/photo of how/where these limits (whether 1kHz or 500Hz) are applied?

 

Thanks again

 

 

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You can limit Dirac moving the apposite cursor in the filter customizatoin section, it is very easy...

Ciao Stefano.

[br]Lumin T1 - Transrotor Darkstar - McIntosh MA7000 - Synology NAS - Magnepan 1.7 - PS Audio P10 Power Plant.

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6 hours ago, asdf1000 said:

 

Brilliant  write up.

 

Is limiting the DSP to a certain range easy?

 

Could you show a screenshot/photo of how/where these limits (whether 1kHz or 500Hz) are applied?

 

Thanks again

 

 

Thank you! As smolteni points out, this is easy to do in Dirac in the step after taking measurements. You drag the “active” window from the right. Here’s a screenshot I stole off the Internet showing what it will look like after. If you can’t move it left, it is because there’s a marker for where you’d like the target curve to be. It’ll be a yellow diamond on a yellow curve. Double click the diamond and that will unblock the window resizer. 

51F646E9-7354-475B-A10F-08A4261EE6D4.jpeg

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  • 7 months later...
On 7/14/2019 at 5:43 PM, AbsolutK said:

I have been wanting to tame a few room anomalies for quite some years now. My source/amplification is a super-integrated DIY (Allo Katana DAC stack, 2 stereo amplifiers and all related power supply). I don't have very many options for DSP, let alone DIRAC. So when I saw the MiniDSP SHD, and amirm's measurements over at ASR, I was sold. It was icing on the cake to learn that Tom from Neurochrome had designed its output stages, whose amplifiers I'm using for my current build.

 

There's not much on the internet regarding this device, what's inside, what's good and bad. So I'll try to cover my observations in case they help someone else. Ask away, if you have any questions and I'll try my best to answer!

 

I just ordered an SHD. I've bookmarked this awesome post! 

 

Any update on the PSU upgrade? I have a power supply I had built for my previous DAC, which looks to be very suitable for the SHD; two Welborne Labs PS-1 power supplies ( +/- 5V to +/- 24V) and a PS-Reg (+5V to + 24V). I will tackle this eventually but voids the warranty so I don't want to rush it. 

“The best sounding audio product is the one that exhibits the least audible flaws.”

 Dr. Floyd Toole

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1 minute ago, audiobomber said:

I just ordered an SHD and I've bookmarked this awesome post! 

 

Any update on the PSU upgrade? I have a power supply I had built for my previous DAC, which looks to be very suitable for the SHD; two Welborne Labs PS-1 power supplies ( +/- 5) to +/- 24V) and a PS-Reg (+5V to + 24V). I will tackle this eventually but voids the warranty so I don't want to rush it. 

Thank you!

 

Sadly I never got around to the PSU upgrade because I sold the SHD a few months later. I found another product that fit the bill - the Micromega M-One (M150) - that included a *very good* 150 wpc Class AB amplifier. At ~$7k new ($4k used), it was a no brainer to replace 2 boxes (one of which was big) with one. 

 

I would later go on to selling even the Micromega, to have a simple system where a Chord Hugo TT2 drives my speakers directly with its 7wpc!

 

 

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OK. Thanks for the detail and photos anyway, very useful.

 

@AbsolutK, just wondering if you actually measured 24V in the power supply, or are you just going by the writing on the Meanwell cap? I thought saw elsewhere that the SHD was +/-15V internally, and the Studio used a 12V wall wart.

“The best sounding audio product is the one that exhibits the least audible flaws.”

 Dr. Floyd Toole

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1 hour ago, audiobomber said:

OK. Thanks for the detail and photos anyway, very useful.

 

@AbsolutK, just wondering if you actually measured 24V in the power supply, or are you just going by the writing on the Meanwell cap? I thought saw elsewhere that the SHD was +/-15V internally, and the Studio used a 12V wall wart.

@audiobomber I measured the harness with a DMM to confirm that 24v was being output by the PSU. On the main PCB there might be a network of LDOs in the power path that drops it to a +/- 15v rail.

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11 minutes ago, AbsolutK said:

@audiobomber I measured the harness with a DMM to confirm that 24v was being output by the PSU. On the main PCB there might be a network of LDOs in the power path that drops it to a +/- 15v rail.

I believe I misread or misremembered. Here's the post I was looking for: 

https://www.minidsp.com/forum/shd-series/15661-power-supply-for-shd-vs-shd-studio#41754

“The best sounding audio product is the one that exhibits the least audible flaws.”

 Dr. Floyd Toole

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35 minutes ago, audiobomber said:

I believe I misread or misremembered. Here's the post I was looking for: 

https://www.minidsp.com/forum/shd-series/15661-power-supply-for-shd-vs-shd-studio#41754

Happens to the best of us! What I believe the author of the quoted post was trying to say is that analog sections are often powered by +/- 15v rails. The SHD very well might also (doing its own regulation from 24v to 15v on board).  

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  • 2 weeks later...
17 minutes ago, jaaptina said:

Why? It's a great sounding device! 

I wasn't confident the SHD would sound as good as my Audiolab DAC/preamp. I may try again later. 

 

“The best sounding audio product is the one that exhibits the least audible flaws.”

 Dr. Floyd Toole

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  • 2 months later...
11 hours ago, Nickolay_V said:

there is Volumio player based on NanoPi NEO2

Not sure how that is relevant. The SHD has a highly configurable crossover, Dirac capabilities and four onboard DAC's as its claim to fame. As far as I can tell the Volumio you mention has none of the above

“The best sounding audio product is the one that exhibits the least audible flaws.”

 Dr. Floyd Toole

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  • 3 months later...

I think Nikolay_V is simply stating that he has identified the streamer board to be the NanoPi NEO2, at least based on appearance. it sure looks to be identical.

 

I question the relative merits of purchasing the device with an integrated streamer and Volumio when I already have invested quite a bit in an analog powered pi/DigiOne Streamer using RopieeeXL (for Roon.) Having used Voluimio before, I see it as a potential step backwards. The DDRC-22D may be the best answer for those who are satisfied with their streamer hardware.

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  • 2 months later...

On that same topic 

 

Is anyone here using the MiniDSP streamer function? (Volumio)

 

If so, how do you find it?

 

How is the remote (phone / tablet) control of Qobuz or Tidal working for you?

 

It's all Web right? There is no ios app to control volumio? 

 

@InfinitelyBaffledhow is using Volumio a step backwards? 

 

I had an Auralic Aries G1 (was great) but sold it and now using MConnect ios app to control UPnP streaming of Qobuz  

 

Mconnect is pretty clunky but just about tolerable. Can't imagine volumio to be much worse. Might try the free install on my Mac....

 

Thanks

Jules

Qobuz - Roon - Weiss 501 DAC - ADAM Audio A5X  + sub  & Meze Empyrean headphones

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I am using Volumio, but only as a Roon end point. For that, it works fine. Regarding my "a step backwards" comment - I meant from Roon to Volumio being a step backward, which it would be. However, the SHD works just fine under Roon. IIRC, the Volumio control app on the browser works fine on an iphone or tablet - it is browser based. 

 

I would not buy an SHD primarily for the streamer function - there are plenty of better options out there for that money.

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Right

 

Thanks very much. (I am struggling to locate Volumio / Qobuz experiences online) 


Thing is, the Mini DSP SHD could act as a "one stop shop" hub I could hang off:

 

It's streamer (built in) - Qobuz

Chromecast audio - optical

TV spdif digital out - coax 

AES/EBU digital XLR out - to self powered speakers. 
 

Is there another product or (combo) that could do this better? 

Jules

Qobuz - Roon - Weiss 501 DAC - ADAM Audio A5X  + sub  & Meze Empyrean headphones

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