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Power Cords and A Mac Mini. They Can Make A Difference

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Mister Pig

Pigamus Maximus
Earlier this year I finally put together a music server I can be happy with. Several years ago I had a Bolder Cable Co modified Squeezebox that made an excellent transport and server, but I let it go to reallocate funds. I never had been able to get back to that quality level of sound with a standard laptop after that. The combo I hit upon came from doing some research and discussing options with some fellow AK friends in the chat room, and mapping out a plan. Now I took some bits of info from there, some from DIY HiFi, some from a manufacturer or two I know, and some from my own instincts. What I ended up with was a Mac Mini running Pure Music and Itunes, a PS Audio LanRover, the Singxer SU1 USB/SPDIF converter, Ethernet and USB cabling from WireWorld, and digital interconnect from VH Audio. This all feeds my Audio Magic Kukama DAC that I have used for several years.

In this configuration the music server sounded very nice, and it finally displaced my EAD T1000 transport. I had the convenience I wanted, good sound quality, and a neat listening room free from shelves of discs. But I had one last avenue to explore, and that was a power cord for the Mac Mini. One of my AK Chat friends relayed the positive experiences he has had, and since I do use power cords on other components, I thought it was an avenue worth exploring. Then on the traders page over at AudioCircle I came across a used MPC/Mini power cord for the Mac. I have spent more for dinner and drinks than what this cord would cost me, so I decided to give it a shot and see what happens, especially since it was the same cord my friend uses.

Well I received it two days ago, and installed it. I was a bit skeptical things would be significantly different, as the Mini is electrically fed by a PS Audio P10 AC Regenerator. I wondered how much difference a 1.5 meter cord is going to make to a computer that is just feeding a digital signal. Well the differences were immediately noticeable, and appreciated. I picked up more smaller details in a recording, such as clearer brush strokes on a drum, a clarity to Rickie Lee Jones mumbles at the end of her phrases, cymbals that had more of a metallic sheen, a larger feel of acoustic space, and a more vibrant attack to dynamic swings. Now the sound was a touch forward also, and I was thinking of turning down the Lpads on the JBL mid horn and high horn of the 4365 speakers. But I let things play for awhile, and I went back to cleaning moss off my roof. When I came back in the evening, things had smoothed out and I did not feel the need to make any adjustments. I left everything the way it is, and the tonal balance is even keeled, and just right.

I know all the arguments against power cords, and I am sure someone will toss in placebo effect, expectation bias, and maybe even delusional. But would be happy to demo for anyone who could come by how much of a change this has made. I have one more power cord I intend to replace in this system, but things are so good right now that I would let anyone listen to this system, it is 99% sorted out now. And it sounds great! I have been doing audio for a long time, and this is one of the better systems I have been around, and its the best I have owned. But on the digital side, I wouldn't have had the last building block in place if I had not taken a flyer and gave this P.I Audio Group power cord a shot. It made a very nice contribution to my system.

Regards
Mister Pig
 
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Thanks for the invite! No travels to the 206/360 zone on my horizon, but I'll get in touch for a demo next time.
 
Interesting. Which version mini are you using?
Also, you are powering your mac with the PS Audio that, I'm assuming, you also power your gear with. I guess no issues with noise or anything going that route?
I've been running my mac and stereo gear on two different circuits to try and eliminate noise but I use no power filtering or regeneration on the mac side.
 
Interesting. Which version mini are you using?
Also, you are powering your mac with the PS Audio that, I'm assuming, you also power your gear with. I guess no issues with noise or anything going that route?
I've been running my mac and stereo gear on two different circuits to try and eliminate noise but I use no power filtering or regeneration on the mac side.

Mine is an A1347 late 2012 build. Uses the i5 Core, 16G Ram, and 500G SSD. Had a fresh copy of Safari installed on it. The person I bought it from says that his wife used it twice a week to update data on her Ipad and Iphone for work and thats it. When I got the Mac, it was like getting a brand new piece in terms of condition. I ended up pairing an Oyen 2TB HDD with it and a Superdrive for ripping discs.

Yes the PS Audio P10 does the whole system. No problems with noise. However, I do use the PS Audio LanRover, and its purpose is to reduce noise on the USB feed. And it does work, even with a low noise platform like the Mac. When I first put the system together, I was doing some listening to USB cables, and I had hot swapped them like I can on my Windows laptop. Well the LanRover would not output a signal, and I took it out to see if that was the issue. It was, but the sound I was getting out of the system was clearly inferior to what I had. I thought I had broken the thing, but I rebooted the Mac just to verify things before I boxed up the LanRover. Thank goodness that was the issue, as it started working again. So no hot swapping USB cables for me with the Mac. Now some folks seem to think that the LanRover is just a repackage of a commercial Ethernet Extender such as the StarTech. It could be, although PS Audio says it has proprietary firmware in it and upgraded parts. The cases do look the same. These folks say they get equal results with a StarTech or Ikron unit, and at about 1/2 the price. If you pick up a quality, not the cheap ones, commercial Ethernet extender you may be able to duplicate the results at a significantly lower price. I got lucky and was able to buy the LanRover for the same money, so I made that choice and did not have to explore alternate avenues.

Regards
Mister Pig
 
I was a bit skeptical things would be significantly different...
I agree that skepticism is a healthy trait. I'm open minded, but need to be convinced.

It's been fifteen years now, but I found it very difficult to understand then how power cords could audibly improve the listening experience until - I borrowed three from a reviewer friend and listened extensively with them in my system over a weekend. I had no expectation of what I would hear, nor was interested in spending what they cost! Now, I consider them to be an essential part of the power supply.

Fortunately, many audio manufacturers and recording engineers have evaluated them with their gear as well. Are all of them beneficial in every system? Certainly not as there are many system based variables along with the fact that the products on the market vary widely. Many times the challenge to understanding how something works is being able to formulate the right question. The standard "miles and miles from the power station" canard fails in this regard.

Professionals comment on the value of the first meter of the power supply

Manufacturers comment on the value of the first meter of the power supply

FWIW, I don't own any Shunyata products, but would likely be very happy with them!
 
I agree that skepticism is a healthy trait. I'm open minded, but need to be convinced.

It's been fifteen years now, but I found it very difficult to understand then how power cords could audibly improve the listening experience until - I borrowed three from a reviewer friend and listened extensively with them in my system over a weekend. I had no expectation of what I would hear, nor was interested in spending what they cost! Now, I consider them to be an essential part of the power supply.

Fortunately, many audio manufacturers and recording engineers have evaluated them with their gear as well. Are all of them beneficial in every system? Certainly not as there are many system based variables along with the fact that the products on the market vary widely. Many times the challenge to understanding how something works is being able to formulate the right question. The standard "miles and miles from the power station" canard fails in this regard.

Professionals comment on the value of the first meter of the power supply

Manufacturers comment on the value of the first meter of the power supply

FWIW, I don't own any Shunyata products, but would likely be very happy with them!

That is the interesting part of all of this, you see I have used aftermarket power cords on my system for years. Now the P10 is an AC Regenerator, and the Mac Mini is fed directly off it, so 1.5 meters of power cord straight from a clean, reconstituted AC wave form. Theoretically it should not get any cleaner in terms of AC power supply. Yet the P.I. Group power cord makes a noticeable improvement. So forget all the miles of Romex in the house, the transmission grid, household appliances on shared circuit, neighbors houses, automation carrier waves riding the AC line....all of that is a non factor since its before the P10. Yet the power cord matters. It's an interesting conundrum to consider.

Regards
Mister Pig
 
So forget all the miles of Romex in the house, the transmission grid, household appliances on shared circuit, neighbors houses, automation carrier waves riding the AC line....all of that is a non factor since its before the P10. Yet the power cord matters. It's an interesting conundrum to consider.
Not really when you consider it to be the first meter.

Most folks approach the problem from the wrong end. That was the observation GamuT engineer Ole Lund Christensen voiced long ago. :)
 
Thank you for the post Mister. Pig. I'm very happy with my Mac Mini-based setup but the MPC/Mini power cord looks interesting. Too much for my pocket but if I ever see a used one I might just have to try it. Good stuff. :)
 
Yet the power cord matters. It's an interesting conundrum to consider.
It would be interesting to note if you still perceive a difference in sound if the cord is swapped without knowing what cord is in use, because psychoacoustics can apply. I know some insist perceived differences can't just be psychoacoustics because they definitely hear a difference, but that's exactly how psychoacoustics works.

There's also the factor of noise-filtering. Most consumer gear is designed with no attempt at RFI rejection, and even some otherwise high-quality test equipment -- usually designed with internal shielding to avoid RFI -- is susceptible. There are models of Tektronix oscilloscopes that are essentially impervious to RFI, and others that are significantly affected. When susceptible equipment is used in an electrically noisy environment, power filtering and sometimes shielded power cords are needed, because otherwise the power line will pick up environmental electrical noise and rebroadcast it inside the equipment case.
 
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I see similarities in our digital front ends, I too am running a Mac mini with Pure music/iTunes. I run the M2Tech Hi Face EVO TWO with the EVO power supply for USB to S/PDIF conversion. I picked up a free AQ jitterbug which I have installed into the mix and later removed. I didnt notice much of a difference with the jitterbug in my system, so I chose to pull it. I run an old Mark Levinson 360S DAC. Overall I am happy but not thrilled with the setup in terms of sound and I dont like the software "look a feel" much. I spend 90% of my time with vinyl now. I appreciate your post, as I had kinda given up on digital. I am planning on upgrading the software to Roon just for the feel of it and it's ability to better catalog all my music; at least that's my perception. For some reason the integration between Pure Music and iTunes seems sloppy to me. The overall sound isnt terrible, it's just not what I had hoped for. I was running a Logitech Transporter some time back and was really happy, for some reason I got rid of it and went another direction. It seems like I haven't got back to that spot since. I hadn't considered a power cable; I had looked a external power supply mod but the cost scared me off. I run a Shunyata Hydra 8 power conditioner and have installed a dedicated, 10 gauge power line from my "brand new" electrical panel to a Furutech 20A outlet. I did the work myself and it was a BITCH ... but I am so glad I did it. It made a huge difference. The electrician I worked with thought I was nuts, but when all was said and done - he confessed I had a damn nice sounding audio system. I wont argue with the naysayers but the attention to system power, took my system to a whole new level.

Wondering :
How do you rate the software in terms of it usability? I have to confess I haven't spent a ton of time playing with the interface - it just kinda sits in the way of iTunes and I stumble over it. For some reason I have never been a big iTunes fan ... I feel like they were always trying to sell me something. I have it configured a bit better now but it's such a "swiss army knife" - I think I would prefer a straight music player. Roon isnt cheap but I am saving my pennies and will run a demo for a bit before I commit the cash. I think a cartridge will come first. I need to take you up on your offer to test out the Cadenza and maybe see what I can derive from your digital setup as well. I feel myself getting pulled back into digital as there are so many deals on used CD music and used vinyl has gotten elusive\expensive. I sure like the convenience of a music server.

Work has me chasing my tail right now but maybe I can beg a test drive of your system later this summer? I'll bring gifts ...
 
It would be interesting to note if you still perceive a difference in sound if the cord is swapped without knowing what cord is in use, because psychoacoustics can apply. I know some insist perceived differences can't just be psychoacoustics because they definitely hear a difference, but that's exactly how psychoacoustics works.

There's also the factor of noise-filtering. Most consumer gear is designed with no attempt at RFI rejection, and even some otherwise high-quality test equipment -- usually designed with internal shielding to avoid RFI -- is susceptible. There are models of Tektronix oscilloscopes that are essentially impervious to RFI, and others that are significantly affected. When susceptible equipment is used in an electrically noisy environment, power filtering and sometimes shielded power cords are needed, because otherwise the power line will pick up environmental electrical noise and rebroadcast it inside the equipment case.

And it may very well come down to shielding. The stock mac cord has minimal, if any shielding in it. I certainly would be open to a listening session with cable swaps. But the wife won't participate in any such endeavor. And Addy our Doxie would leave tooth marks in the wire. She is small enough to get behind the rack though. Let me know when you can make the trip down and I will set a day aside.

Regards
Mister Pig
 
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I see similarities in our digital front ends, I too am running a Mac mini with Pure music/iTunes. I run the M2Tech Hi Face EVO TWO with the EVO power supply for USB to S/PDIF conversion. I picked up a free AQ jitterbug which I have installed into the mix and later removed. I didnt notice much of a difference with the jitterbug in my system, so I chose to pull it. I run an old Mark Levinson 360S DAC. Overall I am happy but not thrilled with the setup in terms of sound and I dont like the software "look a feel" much. I spend 90% of my time with vinyl now. I appreciate your post, as I had kinda given up on digital. I am planning on upgrading the software to Roon just for the feel of it and it's ability to better catalog all my music; at least that's my perception. For some reason the integration between Pure Music and iTunes seems sloppy to me. The overall sound isnt terrible, it's just not what I had hoped for. I was running a Logitech Transporter some time back and was really happy, for some reason I got rid of it and went another direction. It seems like I haven't got back to that spot since. I hadn't considered a power cable; I had looked a external power supply mod but the cost scared me off. I run a Shunyata Hydra 8 power conditioner and have installed a dedicated, 10 gauge power line from my "brand new" electrical panel to a Furutech 20A outlet. I did the work myself and it was a BITCH ... but I am so glad I did it. It made a huge difference. The electrician I worked with thought I was nuts, but when all was said and done - he confessed I had a damn nice sounding audio system. I wont argue with the naysayers but the attention to system power, took my system to a whole new level.

Wondering :
How do you rate the software in terms of it usability? I have to confess I haven't spent a ton of time playing with the interface - it just kinda sits in the way of iTunes and I stumble over it. For some reason I have never been a big iTunes fan ... I feel like they were always trying to sell me something. I have it configured a bit better now but it's such a "swiss army knife" - I think I would prefer a straight music player. Roon isnt cheap but I am saving my pennies and will run a demo for a bit before I commit the cash. I think a cartridge will come first. I need to take you up on your offer to test out the Cadenza and maybe see what I can derive from your digital setup as well. I feel myself getting pulled back into digital as there are so many deals on used CD music and used vinyl has gotten elusive\expensive. I sure like the convenience of a music server.

Work has me chasing my tail right now but maybe I can beg a test drive of your system later this summer? I'll bring gifts ...

Never played with the Jitterbug, so I cannot comment on it. The LanRover does make a nice contribution to my system, and I could pull it out for you and we can see what it does. Do the same with a power cord demo against the stock one. You are certainly welcome to come up for a visit, it would be a fun evening/afternoon or whatever.

The iTunes/Pure Music interface can be a bit of a kludge. I use Retune for most of my listening sessions to control music from the server. It's display is OK and functional, but I did like the HySolid interface I used to run on a Windows machine better. But, the sound quality of the Pure Music is great, I wouldn't change it till you heard what I have here. As much as I like my two tables, digital is very good on a well recorded disc.

I put the music server together in pieces, starting with an old Dell laptop. The first piece to come in was the LanRover, then I bought the Mini, then I replaced my SMSL USB/SPDIF converter with the Singxer, then I added the USB and Ethernet cables from WireWorld, then I added Pure Music, the last step was the P.I. Audio Group power cord. The tipping point of the system sounding good was getting the trio of the Singxer, LanRover, and Mini together. The following additions added refinements, and created a natural sounding top end versus the slightly grainy and stilted upper frequencies that seem to affect computer audio playback.

Be warned though, Addy and Ginny might frisk you at the door for doggie treats!

Regards
Mister Pig
 
And it may very well come down to shielding. The stock mac cord has minimal, if any shielding in it. I certainly would be open to a listening session with cable swaps. But the wife won't participate in any such endeavor. And Addy our Doxie would leave tooth marks in the wire. She is small enough to get behind the rack though. Let me know when you can make the trip down and I will set a day aside.
We'll do this, but not sure when. I live in England and rarely get to North America, let alone the wet coast. If I still lived on Vancouver Island, as I did in 2001, it would be easy, but I don't.
 
We'll do this, but not sure when. I live in England and rarely get to North America, let alone the wet coast. If I still lived on Vancouver Island, as I did in 2001, it would be easy, but I don't.

Well I do have a guest bedroom. I guess you wouldn't be making just a day trip. When you get a date, I will put it on the calendar. :beerchug:

Regards
Mister Pig
 
While I usually avoid commenting on cable threads of any sort, I must say that I made my own 12ga shielded power cable from the wall to an Accuphase 40th anniversary power cable which feeds a perfect outlet by PS. The wiring to my place is all new 12ga copper, routed to a nearby sub panel fed by 6ga copper from the main basement feed, which is also new, along with all of the street wiring right back to the new substation. I have enjoyed the clarity.
Note: this is being dealt with, as far as neatness is concerned.
IMG_4650.JPG
 
I have enjoyed the clarity.
Nah, you're just making that up. ;)

I see you use ASR Emitter amps. I was very impressed when I heard them at Harry's some years ago . He had one driving the Nola Grand Reference mains and the other on the woofer towers. And of course, had the whole flotilla of battery modules with Nordost Valhalla power cords.

asr.jpg
 
Nah, you're just making that up. ;)

I see you use ASR Emitter amps. I was very impressed when I heard them at Harry's some years ago . He had one driving the Nola Grand Reference mains and the other on the woofer towers. And of course, had the whole flotilla of battery modules and used Nordost Valhalla power cords.

asr.jpg
Yes, I have the 4 box Emitter II Exclusive. One of the 4 is a battery PS. Quite an amp.
 
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