Has anyone tried these stunning new CPT power cord?

First a question then an observation.

Has anyone been able to contact Mark or anyone from Core Tech? I have sent numerous emails, phone messages and I even sent messages through the Audiogon system with no reply.

My observation and a concern is that the 300 watt version that I have has NO ground connected at the output. With a power strip I plugged in a voltage tester and it shows an open ground. Thinking that my power strip may be the problem, I then tried an adapter to convert the IEC end to a AC 3 prong. Again, the voltage tester shows an open ground. Is this normal? Now maybe the transformer grounds the unit, but everything else after that has no ground.

klh007,

So Mark is Core Tech?  I thought he was the rep.

Mark,

I disagree, I have left at least 3 phone messages and many more emails.

But, that being said, please answer the question as to why the 300 watt shows an open ground at its output. Is mine defective? Can anyone else confirm that the IEC end has no ground signal?

Mark,

Thank you for calling me. Mark assured me that everything is ok with my 300 watt unit and he will have his engineer talk to me more about it.

jmcgrogan,

I'm lead to believe that the transformer is grounded but with my measuring type equipment it shows as a open ground on the output end. Once I talk to the engineer I hope to understand further and I'll share that  info.

I understand that one of your customers tried using an off-the-shelf AC Line Voltage Polarity tester on the the output of an Equicore and was confused by the results. He or she should be: it's the wrong tool for assessing the Equicore's properties.

Conceptually, Equicore is a simple unbalanced-to-balanced transformer, as described in numerous on-line references. (Google and its brethren are your friends.) The 120 (or 240)V AC line voltage is impressed on the primary, and the output is wired to deliver a center-tapped 120 (or 240)V output. This offers significant audible benefit in cleaning up common-mode noise coming from the AC line, at least to my aging ears. For safety, the secondary center tap is connected to the green ground from the AC line. There is no magic here.

Your typical AC Line Voltage Polarity tester measures the voltage from green ground, the long prong on the AC plug, to each of the other 2 prongs. One of them is called "hot" and the other "neutral". The "hot" one should exhibit a 120V (or 240V) difference from green ground. The "neutral" wire should be pretty much at ground and will typically be no more than a few 10's of millivolts from ground. The Polarity tester "lights some lights" to indicate these voltages in sort of a "go/no-go" fashion. In some instances, the hot and neutral are inadvertently swapped or otherwise incorrectly connected, which can cause problems for some equipment. Hence the need for such testers.

The reason this is the wrong tool is that both hot and neutral are the same voltage (~60V) away from ground for Equicore! That's the way it's supposed to work in order to derive its many benefits. Again, I don't know why someone chose to try to assess the performance with such a device, as its indicators would not be as expected.

It's important to note the a safety ground is assured by connecting the center tap of the transformer secondary to green ground. Any equipment whose chassis is ordinarily grounded to the AC line green ground will still have this connection.

HTH.

JL

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So - there you have it. Ground IS IN PLACE... but in pure-speak it might be "masked" to some measurement techniques. John makes note of that here 

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For safety, the secondary center tap is connected to the green ground from the AC line. There is no magic here. 

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We have not had any issues with respect to this and to today we have still had one only return (from The Netherlands). 

None of this is simple or easy (at least I don't think it is) and I applaud vigorously the work of @ozzy for his analysis - given the tools he had. His offending sub(s) are not plugged into any of our outlets but given the system is by definition "A SYSTEM" he was looking at all potential causes. We did get caught in that rip-tide a bit. 

I'm here to help - although very little voice recovering still from whatever virus has invaded my chubby body. 

Thanks once again...

Best wishes -

Mark

Good Evening…

I wanted to take a moment as the week is ending here to send along my very genuine thanks to all of you that have supported us – and waited so very patiently for us to finally ship 1200’s and 1800’s which begins tomorrow.

I’m sending along a few links to pictures. I took a unit away from the Production Bench and just snapped a few pictures and shot a quickie video. I hope you enjoy these…

http://i1253.photobucket.com/albums/hh582/corepowertech/20161030_170144_resized%20003_zps9p6lfbkg.jpg

http://i1253.photobucket.com/albums/hh582/corepowertech/1800%20front%203_4_zps8td3kpw1.jpg

http://vid1253.photobucket.com/albums/hh582/corepowertech/1800.mp4_zpsvnrtaozu.mp4

I’m so very appreciative to all of you for suffering through these Production delays. Besides some very real family issues and the loss of our wonderful teammate Tyler Elliott… we had 11 distinctive issues arise during the early production process. On top of that… many of you know that I’m the Lead Designer and Manufacturer of ALL the Emerald Physics products. I’m very proud of that but over the last 8 weeks we have had to plan and move the ENTIRE LOUDSPEAKER INVENTORY to Texas where they will now be made. This took an enormous amount of time and man (and woman) power. The job is only 60% complete. The balance leaving for Texas over the next two weeks. BTW – we are talking about over 100 baffles.

I can only say thank you – and I will add that we will NEVER allow any of our dealers to book orders in advance and accept money for same. This practice ends. Even with best plans made… stuff does happen, and working without a safety net makes it 10 x more difficult. The product is tested – safety checked, design carefully reviewed repeatedly, as I cannot abide by in-field problems that we could have solved.

These delays were all dealt with correctly and proved out with careful attention to detail. We are a very small company and we are judged daily by how we perform. I thank you all again for your help and understanding. I also want to send a shout out to @LAK for his particular kindness and courtesy in his notes to me. Thank You!

Along the way… a very nice thing has happened as well today. The Everything Audio Network review of the E=C 300 was published today. John Gatski is well known to industry vets like myself as a complete NO Nonsense Reviewer. John is very reserved and achieving a Stellar Sound Award makes all of us proud.

 http://i1253.photobucket.com/albums/hh582/corepowertech/Stellar%20Sound%20Award_zps7q1lwans.jpg

You can find the review itself here…

http://everythingaudionetwork.blogspot.com/

There is a lot to say about this review – but best if I just let the review speak for itself. I have yet to find a system that our EQUI=CORE has not improved – and I have tested our products on all types of systems at all price points up to 50K +.

Lastly tonight… I am pleased to share with you that my long-time and very dear friend Doug Goldberg has stepped up with two new designs that are going to change EVERYTHING we know about the Power Product Segment of our industry – just as some of his designs changed everything in the digital world back when we owned Audio Alchemy.

Doug is The Real Deal – he has worked on our nation’s BEST Fighter Jets where power is a very big deal. Doug’s first new product is Deep Core – and we expect that Deep Core will be available in 4 to 5 weeks. The design is in house and it blows me away. This is a very important product for our company and to be candid, Deep Core will work with every other Power Product and cable I’m aware of at this moment.

In Doug’s words –

The Deep Core is a multi-function power conditioner that re-defines the category. The Deep Core is designed to not only provide clean, spur free power but it also allows the user to optimize the power delivery interface via a user adjustment. The optimization of the power delivery interface can significantly affect sound quality as the prime power source is a major contributor to attributes such as the noise floor and dynamic range of the system. The Deep Core can be used with almost any system configuration providing optimized power for both source components and power amplifiers. Deep Core has the following major attributes;

·         Input circuit features a unique DC snubber which stops any DC , constant or transient, imposed upon the power lines from passing through the Deep Core and into the system. DC can saturate the transformers of source components and cause voltage fluctuations.

·         After the DC snubber the Deep Core has a complex common mode filter designed to suppress any RF signals that may be riding on the power lines. This RF energy can raise the noise floor and affect the total dynamic range of the system. The EMI filter is implemented with high quality magnetics that will not saturate under high current conditions.

·         After the common mode filter a second EMI/RFI filter is implemented that further cleanses the power of unwanted out of band products. This additional filter includes integrated surge suppression to ensure that no high voltage transients, such as the voltage from a lightning strike, will pass through the system

·         The last stage of the Deep Core contains the adjustable power delivery interface. This interface allows the user to optimize the power delivery to his or her system. This unique capability allows the Deep Core’s performance to be optimized for each individual user case.

Please note that we surely do want to tell you more about this “Adjustable Power Delivery Interface” and later we surely will. For now, we are only saying that this adjustment makes differences that will startle. Like our Balanced Power EQUI=CORE models, this topology is rooted directly in science. No hocus-pocus. A full and complete suite of measurements will be published in November for Deep Core and of course… the perfect companion product is our AC Balanced Power Source --- EQUI=CORE. They make beautiful music together. As this product is IEC in – and Hubbell Duplex Out – your existing power cords are welcome and will perform like you have never heard them. It’s going to be fun.

All 15 of those of you that paid and waited for EQUI=CORE 1200 or 1800 you will be given very special factory coupon to use if you find yourself interested in Deep Core. Continuing to say how sorry I am.

Thanks again – and my apologies for this ultra-long message.

has anyone tried connecting the equi-core 1200w and equi-core 300w in series? is there any slight improvement?
i'm thinking of buying a big equi-core 1200w and connecting the smaller equi-core power cables(which i presently have 2) DIRECTLY into one of the receptacles.(1200w)

Mark,

I'm think of using the 1800 for my amp and plug the 300 into it for my digital (which I use with a power strip).

Would this provide better sound quality for the digital? Or would I still be better off using the 300 and the 1800 on different dedicated circuits?

I received my 1800 yesterday. Oh baby!

More to follow...