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In the new March 2020 Positive Feedback review they said:

"The reason this review is easy, is because the DEEP=CORE works.
Starting with the 5u4g rectifier tube, the faint hum was gone. It was
replaced by an inky black background. Simple, easily, measurable, and
effective. I assumed that replacing the 5u4g with the 5AR4 would likely
reduce hum. Instead to my surprise I was greeted once again with an inky
back background. No hum, no hiss, just silence. Of course listening to
music sounded great, and I felt like bass was cleaner. To
have no audible noise from an 8 watt single ended tube amp with 0
feedback using a 104dB efficient headphone is simply unreal and
justifies the DEEP=COREs purchase for me."

 

"So,
do I recommend the DEEP=CORE?  Absolutely! I for one I am keeping mine.
Its effects are clearly audible in my system, and I am always all about
lowering my noise floor."

 

"Based
on the fact that I do not have a dedicated circuit for my audio
equipment, and I have appliances that run on the same circuit, the
DEEP=CORE is simply a no brainer and a must have for me."

 
Read the entire review here: https://positive-feedback.com/reviews/hardware-reviews/core-power-deep-core/

The Deep Core 1800 is a multi-function power conditioner that re-defines the category. it is a full 15 amp, 1800 watt unit good for amps and all other components.

It is designed to run in front of any power    conditioner and upgrade the sonics

Here is the latest customer feedback:

Hi
Walter,  For
months I hesitated in adding a Deep Core to my 1800 Core unit, as I thought my
PS AUDIO Duet coupled with the 1800 would be sufficient for cleaning the
power.  Occasionally I would email Walter for his input, and he said it
did other things that other conditioners do not. So I finally got one.

Well,
it may be the BEST decision I've ever made in my years as an audiophile!! 
The dynamics, noise floor, realism, and ease of effortless musical flow are
unbelievable for an under 1K purchase!!!  It's like a new system, and
sounds like one costing much more.  I am truly blown away at the
upgrade!  The control on back of the unit to fine tune the sound is
amazing unto itself!  These products truly deliver, and I am one happy
listener right now!!  Can not recommend enough!  If you're on the
fence, just do it!!  

Call
me amazed at Core Power, and I've never been led down a wrong road yet in all
my dealings with Walter either!!!

Thanks
so much...Brian.

See the the 90 second Tone Audio video at:

https://www.youtube.com/watch?v=vooEXOSSnz0

In the Enjoy the Music review they sum with:

In my review of the Equi=Core 1800, I stated that the effect it had was magical resulting in quieter backgrounds and a deeper three dimensional image. I really did not think it was possible to squeeze much more improvement out of the system until I inserted the Deep Core 1800 and then properly adjusted it. The improvement top to bottom was similar to the effect that occurs when you clean a camera lens. Everything snapped into clearer focus. The soundstage deepened with images locked solidly in place. I honestly didn't think it would make this much difference, but it did. Okay Walter, let me sum it up like this.

You can't have the Deep Core back either. 

Rufus Smith – Enjoy The Music

In the ToneAudio Dec 2019 review they say:

"Bottom line, it works"

"After trying the Deep Core in a few different system configurations, it
unmistakably does reveal more music with no shortcomings. Transients
aren’t compromised, and the bottom end is not smeared – another sin that
more than one power conditioner has committed during the audition
process. Best of all, more musical detail is revealed, without the mid
to high range becoming etched, harsh, or overemphasized. This is much
harder than it sounds. That’s why most power products ultimately end up
being unplugged in favor of the existing devil in the wall socket."

Read the entire review here:

https://www.tonepublications.com/review/the-deep-core-1800-power-conditioner/?fbclid=IwAR1CHmOP7ery3bkjb4HqPE2oOLZNlYXK56sbT6xol1DFGO0Ap2VGe_YP9jU

In their December 2019 review Stereotimes summed with:

"Placing
the DEEP=CORE 1800 as the front end for power in a variety of
configurations, I noted that the signal was indeed enhanced – more
palpable, more engaged, with a touch more life to dynamics and cleaner,
with a touch of blacker background in quiet areas. These attributes were
subtle but apparent."

Read the entire review at:

http://v2.stereotimes.com/post/core-power-technologies-deepcore-1800/

Here is another user feedback:
Walter, I want to thank you for the advice on your Deep Core product line. I purchased the Deep Core and a Diamond AC cable and was astounded on how a very good system started knocking at the door of using the word "Magical" to describe the improvement your products brought to my audio system. The presentation is so stunning that you don't think about words to describe it, you sit and listen.  These products opens more of the heart and soul of the musicians and the music. Thank you, thank you, and thank you again for your recommendations on these products. JS

The Deep Core 1800 is designed to not only provide clean, spur free power but it also
allows the user to optimize the power delivery via a Contour Control user
adjustment. The optimization of the power delivery interface can
significantly affect sound quality as the power company is a major
contributor to attributes such as poor noise floor and dynamic range of
the system.

The Deep Core 1800 can be used with almost any system configuration providing optimized power for both source components and power amplifiers.

It
will work as a stand alone device, in front of the Equi=Core 1800 or
older 1200, 300 etc, or in front of any other power conditioner you may
already own. However, it works best when used in front of a quality power conditioner, like our Equi=Core 1800 MK2 balanced power conditioner.

The Deep Core 1800 has the following major attributes;

• An Input circuit that 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 or source components and cause voltage fluctuations. DC is a major problem on almost all power lines. Some worse than others. (See the graph and note how the Deep=Core removes all DC)
  
• 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 insure 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 CONTOUR CONTROL power delivery interface. This
  interface changes the relationship between neutral and ground and
  allows the user to optimize the power delivery to your system. This
  unique capability allows the power to be optimized for each individual
  system.

The
Deep Core 1800 should be connected in front of ANY power conditioner
as it is the “final” word in preparing your AC for a good power
conditioner. Its unique ability to not only fully cleanse AC power
sources of  DC, EMI and RFI noise, as well as to match your AC to
your individual components, is unique among competing products. It can
also be the foundation of a full A/C cleaning system solution.

Here are some initial reviewer quotes:

Rufus Smith from Enjoy the Music said: "Where do I attach the chains because you are not getting them back?"

Kemper Holt of AV Showrooms emailed:

"My impressions so far, more low level details, soundstage opens up a little, low bass below 40 Hz seems more present, and twirling the knob (getting up-moving knob-sitting back down), in my system it thins out a bit 1 direction, and thickens/adds meat on the bones the other. Perhaps the lack of any DC leakage in the line allows the system (amp) to generate more/solid bass?"

Size and weight
8 x 8 x 3.5"   (12x12x12 shipping box)

7 pounds  (13 pounds shipping weight)

  Equi=Core 1800 MK2 / Deep=Core 1800 combo package

                          with two $400.00 power cords

This $4290.00 package offers state of the art power conditioning and surge protection and is on sale for $1999.00 delivered during our Black Friday sale.

Note: We also have an option of a new pure copper duplex to replace the standard brass Hubbell's for an additional $60.00 on the Deep Core 1800 or $200.00 for all 4 on the Equi=Core 1800 MK2.

Call us at 770-667-5633 to discuss these state of the art line conditioners.

Buy with confidence from AudiogoN’s #1 rated dealer by feedback.

New orders typically ship in 1-2 business days of placement.

We accept PayPal, Visa, Discover, AMEX, MasterCard and money orders.
Call me at 770-667-5633 to discuss these superb line conditioners.
GA & HI residents add sales tax.

Brands carried: Ampsandsound tube electronics, Audio Space tube electronics,  Audio Alchemy, Black Ice Audio tube electronics, Bob
Carver tube amplifiers, Burson Audio, Core
Power Technologies A/V power conditioners & cables, DSPeaker room correction, EAT
Turntables, Emerald Physics amplifiers,
Focal headphones, Gallo speakers, Graham Slee phono stages, HifiMan headphones, Lehmann phono stages, LSA speakers, amps, headphones and turntables, Marantz
Reference, Melco servers, Music Hall turntables, Ortofon
cartridges, Peachtree Audio, Project turntables, Pure Audio Labs DAC's,
Quad speakers, headphones and electronics, Raal headphones, Rethm
speakers, Scansonic speakers, Silverline Audio speakers, SoundSmith cartridges, Spread
Spectrum Ampzilla amps & preamps, Sumiko cartridges, Wireworld & Wywires cables, Wyred 4 Sound, Zesto Audio tube electronics

Sales policies on the Underwood Hifi Inc. website at www.underwoodhifi.com