U S ER’S MAN U A L
The Evolution STA-SE sets a new standard in distortion reduction
with its Only Distortion Cancellation (ODC) technology and
proprietary ultra-low-noise GaN (Gallium Nitride) power supply.
This combination delivers exceptional clarity, a deep and
expansive soundstage, high dynamic range, and warm, Class
A-like tonal characteristics.
EVO STA-SE
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Table of Contents
FCC Notice - Declaration of Conformity Information ..................................................................... 2
EU Declaration of Conformity ....................................................................................................... 3
Safety Instructions ......................................................................................................................... 4
The New Benchmark in Reference Stereo Power ........................................................................... 7
Specifications
...............................
................................................................................................................................
................................................................................................. 9
.......................... 10
. 13
NuPrime’s Limited Warranty and Limitation of Liabilities ............................................................. 14
1
How it Works
Gallium Nitride High Frequency High Efficiency Power Module (Gan HFHFPM)
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FCC Notice - Declaration of Conformity Information
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment uses and can radiate
radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio co
mmunications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment o and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and r
eceiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING: Only peripherals complying with the FCC class B limits may be attached to this
equipment.
Changes or modifications made to this equipment, not expressly approved by us or parties
authorized by us could void the user’s authority to operate the equipment. This device com
plies
with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device
may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
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EU Declaration of Conformity
Hereby, NuPrime Audio, Inc. declares that this device is in compliance with the essential
requirements and other relevant provisions of Directive 2004/108/EC.
The manufacturer of this product is NuPrime Audio, Inc., 1712 Pioneer Ave. Ste 1817, Cheyenne,
Wyoming 82001, USA.
The Authorized Representative for EMC and product safety is NuPrime Audio, Inc., 1712 Pioneer
Ave. Ste 1817, Cheyenne, Wyoming 82001, USA.
For any service or g
uarantee matters please refer to the addresses given in separate service or
guarantee documents.
For Customers in Europe
Disposal of Old Electrical & Electronic Equipment (Applicable in the European
Union and other European countries with separate collection systems)
This symbol on the product or on its packaging indicates that this product shall
not be treated as household waste. Instead it shall be handed over to the
applicable collection point for the rec
ycling of electrical and electronic equipment.
By ensuring this product is disposed of correctly, you will help prevent potential
negative consequences for the environment and human health, which could
otherwise be caused by inappropriate waste handling of this product. The
recycling of materials will help to conserve natural resources. For more detailed information
about recycling of this product, please contact your local Civic Office, your household waste
disposal service or the
shop where you purchased the product.
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Safety Instructions
There are two categories of Safety Instructions included in this manual:
• Product Warnings, (i.e., what must never be done to assure avoiding those hazards that
• could cause bodily injury or property damage); and
• User Directions (i.e., what must always be done to assure the safe use of your device).
The Safety Instructions contained in this manual have been categorized in accordance with the
seriousness of the potential hazards thr
ough the use of Signal Words. Those Signal Words, and
their intended meanings, are as follows:
DANGER: Indicates that a failure to observe the Safety Instructions could result in death or
catastrophic bodily injury.
WARNING: Indicates that a failure to observe the Safety Instructions could result in serious
bodily injury.
CAUTION: Indicates that a failure to observe the Safety Instructions could result in minor bodily
injury or property damage.
NO
TE: Designates important information that relates to activities and/or conditions that might
result in loss of data and/or damage to your device.
Safe Use and Operation of Your Device
This equipment emits stray RF energy and will interfere with the reception of signals by airborne
electronic navigational devices or medical devices. Do not operate this equipment near any
sensitive medical devices.
WARNING: Use only grounded AC power cords.
Always immediately disconnect the powe
r to the equipment in the event the device emits an
unusual odor or sound or generates smoke.
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WARNING: Never attempt to disassemble, repair or make any modification to your device.
Disassembly, modification or any attempt at repair could cause bodily injury or property damage,
as well as damage to the device itself.
WARNING: Your device is not a toy. Never allow children to play with your device. Misuse, rough
or improper handling of your device by children could result in serious bodily injury for any of the
enumerated safety warnings in this manual. In a
ddition, always keep all accessories and
components out of the reach of small children as small parts might present a choking hazard.
Seek immediate medical attention if choking occurs or if any small part has been swallowed.
CAUTION: Never raise the sound volume level too high when using your device with earphones.
An excessive sound volume level could cause damage to your hearing.
WARNING: To reduce the risk of re or electric shock, do not expose the unit to mo
isture or water.
Do not allow foreign objects to get into the enclosure. If the unit is exposed to moisture, or a
foreign object gets into the enclosure, immediately disconnect the power cord from the wall.
Take the unit to a qualified service person for inspection and necessary repairs.
Read all the instructions before connecting or operating the component.
Keep this manual so you can refer to these safety instructions.
Heed all warnings and safety informat
ion in these instructions and on the product itself. Follow
all operating instructions.
Do not use this unit near water.
You must allow a minimum 10 cm or 4 inches of unobstructed clearance around the unit.
Do not place the unit on a bed, sofa, rug, or similar surface that could block the ventilation
openings. If the unit is placed in a bookcase or cabinet, there must be ventilation of the cabinet to
allow proper cooling.
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any other appliance that
on the rear
Keep the component away from radiators, heat registers, stoves, or
produces heat.
The unit must be connected to a power supply only of the type and voltage speci ed
panel. Connect the component to the power outlet only with the supplied power supply cable or
an exact equivalent. Do not modify the supplied cable.
Do not route the power cord where it will be crushed, pinched, bent, exposed to heat, or
damaged in any way. Pay partic
ular attention to the power cord at the plug and where the cord
exits the back of the unit.
The power cord should be unplugged from the wall outlet during a lightning storm or if the unit is
to be left unused for a long period of time.
Immediately stop using the component and have it inspected and/or serviced by a quali ed
service agency if:
• The power supply cord or plug has been damaged.
• Objects have fallen or liquid has been spilled into the unit.
• The unit has
been exposed to rain.
• The unit shows signs of improper operation.
• The unit has been dropped or damaged in any way
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The New Benchmark in Reference Stereo Power
The NuPrime Evolution STA-SE is not merely an update; it is a reimagining of what a reference-class stereo power
amplifier can achieve. By combining our award-winning Only Distortion Cancellation (ODC) technology with a
revolutionary ANC GaN (Gallium Nitride) Power Supply, the STA-SE delivers an staggering 400W per channel of
pure, effortless authority.
Building on the “giant-killing” reputation of its predecessor, the Special Edition pushes the boundaries of
transparency, speed, and musicality, offering the liquid warmth of Class-A with the surgical precision and explosive
dynamics that define the NuPrime sound.
The STA-SE continues to utilize NuPrime’s breakthrough Only Distortion Cancellation (ODC) Class-D design:
● Unlike traditional designs that use a global feedback loop, ODC derives its error signal directly from the MOSFET
devices and output filter. This approach resulted in a substantial reduction in distortion THD+N of 0.002%. This
surgical level of precision results in a sound that is entirely neutral and transparent.
● High-Speed Resolution: Operating at a 650kHz switching frequency, the STA-SE captures the complex harmonic
structure of live music, delivering a “holographic” soundstage that is both wider and deeper than its predecessor.
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Revolutionary ANC GaN Power Supply Technology
Advanced GaN Power Factor Correction with Active Noise Cancellation
How it Works
● The ANC Feedback Loop: Much like high-end noise-canceling headphones, the STA-SE’s power supply monitors
the AC line for noise and ripple. It then generates an “anti-noise” signal to cancel out interference in real-time.
This reduces power supply noise to levels previously thought achievable only by massive, expensive linear
transformers.
● Dual-Phase Interleaved Topology: By interleaving two power phases, the STA-SE significantly reduces ripple current
and ensures a smoother, more stable delivery of energy.
● Efficiency Meets Authority: The GaN semiconductors operate at switching speeds far beyond traditional silicon.
This allows for near-instantaneous current delivery (up to 40A) and a near-perfect power factor, ensuring that the
amplifier remains cool and unshakeable even when driving the most difficult, low-impedance speakers.
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Gallium Nitride High Frequency High Efficiency Power Module (Gan HFHFPM)
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Beyond the PFC stage, the Evolution STA-SE employs new-generation GaN semiconductor modules for the critical
power conversion stages that supply the amplifier circuits. The choice of GaN semiconductors over traditional
silicon-based solutions enables this extraordinary power density (400W x 2) while maintaining excellent thermal
characteristics and switching efficiency. This translates to reduced heat generation and improved long-term reliability.
Engineering Excellence Through Miniaturization
Perhaps most remarkably, this advanced power supply system delivers performance equivalent to traditional
transformer-based power supplies while occupying only one-fourth the physical space and weighing merely 20%
of conventional designs. This dramatic reduction in size and weight opens new possibilities for amplifier design and
placement flexibility without compromising performance.
The Sonic Signature: “Liquid Precision”
● The Bass: Authoritative, rock-solid, and richly textured. With high current capability and exceptional control, low
frequencies are delivered with speed, weight, and precision — not just heard, but felt, maintaining perfect timing
even in complex passages.
● The Midrange: Full-bodied, natural, and saturated with a Class-A-like warmth inspired by the NJR MUSES8820
op-amp stage. Vocals and instruments possess a lifelike presence, allowing the speakers to disappear within a
wide and deep soundstage that reveals even the most subtle details without artificial enhancement.
● The Treble: Refined, airy, and extended, free from the ringing or brightness often associated with high-power
switching amplifiers. Ultra-low distortion and a clean background ensure delicate nuances emerge with purity
and realism.
● Dynamics: Fast, expansive, and effortlessly powerful. From the subtlest micro-details to large-scale orchestral
crescendos, the presentation maintains clarity at the deepest layers, offering greater dynamic range, scale, and
transparency throughout.
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Technical Highlights
● Massive Output: 400W x 2 RMS @ 8 Ohms and 4 Ohms. The maximum RMS output is 400W per channel;
therefore, both 4-ohm and 8-ohm loads receive the same power.
● Dual-Mono Configuration: Truly independent power paths for left and right channels to eliminate crosstalk and
maximize imaging precision.
● High-Speed Switching: Operating at 650kHz, the switching frequency allows for a resolution that approaches the
finest analog designs.
● The entire power path fully adopts 40A ultra-high current and low resistance terminals. Improve current dynamic
capability. Total of 52,000uF power supply filter capacitors.
● Preamp stage and Class D oscillation circuit utilizing high-end NJR MUSES8820 op-amp.
● Featuring Furutech FP900 RCA inputs and high-conductivity binding posts for an uncompromized connection.
● High quality copper PCB trace instead of usual cables are used to connect the power supply to the amplifier’s
circuitry, maximizing power delivery.
● Resonant-Free Chassis: Mounted on NuPrime’s proprietary vibration-damping isolation feet.
Why the Evolution STA-SE?
Reviewers of the original STA noted it was “difficult to criticize” and “kept them listening late into the night.”
The STA-SE takes that winning formula and adds nearly double the power and a next-generation GaN power
architecture. It is the ultimate choice for the audiophile who demands the soul of a tube amp and the muscle of
a powerhouse solid-state, without the heat, weight, or distortion of either.
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Specifications
● Power Output (RMS): 400W @ 8 Ohms , 400W @ 4 Ohms
● Gain: x21
● Sensitivity (to rated power): 2Vrms
● Input Impedance: 47K Ohms
● Output Impedance: 4m Ohm
● Furutech FP900 RCA input connectors and Eichmann binding post.
● WATT / THD / S/N (typical) : @5W (0.0025% ,95db) , @50W (0.007% , 105db) , @100W (0.01% , 110db)
● Frequency Response: 10Hz to 50kHz (-3dB)
● Trigger IN and OUT
● Standby Power : 1.5W @ 115V outlet, 1.7W @ 230V outlet
● Idle Power : 24W @ 115V outlet, 26W @ 230V outlet
● Worldwide AC voltage: (115VAC / 230VAC) with Voltage Select Switch
● AC Fuse : Slow blow , 7A , 250VAC
● Color : Black or Silver
● Product Dimension: 57 x 430 x 375 mm (H x W x D)
● Package Dimension: 642 x 594 x 254 mm (H x W x D)
● Product Weight: 5.2kg
● Package Weight: 7.5kg
Warranty: 3 years.
NuPrime’s Limited Warranty and Limitation of Liabilities
ADDITIONAL RIGHTS
For consumers, who are covered by consumer protection laws or regulations in their country of
purchase or, if different, their country of residence, the benefits conferred by this warranty are in
addition to all rights and remedies conveyed by such consumer protection laws and regulations.
This warranty does not exclude, limit or suspend any rights of consumers arising out of
nonconformity with a sales contract. Some countries, states and provinces do not allow
the
exclusion or limitation of incidental or consequential damages or allow limitations on how long an
implied warranty or condition may last, so the limitations or exclusions described below may not
apply to you. This warranty gives you specific legal rights, and you may also have other rights that
vary by country, state or province. This limited warranty is governed by and construed under the
laws of the country in which the product purchase took place.
LIMITED WARRANTY
For a period of THREE (3) YEAR from the date of retail purchase
by the original end-user purchaser
(“Warranty Period”), NuPrime warrants (in) this product against defects in materials and
workmanship, and (ii) that each Product, unmodified and under normal use and conditions, will
substantially comply with NuPrime’ applicable written technical documentation for the Product.
NuPrime reserves the right to make substitutions and modifications from time to time in the
specifications of Products sold by NuPrime, provided that such subs
titutions or modifications do
not materially affect overall Product performance.
If a hardware defect exists and a valid claim is received within the Warranty Period, at its option
and to the extent permitted by law, NuPrime will (1) repair the hardware defect at no charge,
using new or refurbished replacement parts, (2) exchange the product with a product that is new
or which has been manufactured from new or serviceable used parts and is at least functionally
equivalent to the original product, or (3) refund the purchase price of the product. NuPrime may
request that you replace defective parts with user-installable new or refurbished parts that
NuPrime provides in fulfillment of its warranty obligation. A replacement product/part assumes
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14
the remaining warranty of the original product or ninety (90) days from the date of replacement
or repair, whichever provides longer coverage for you. When a product or part is exchanged, any
replacement item becomes your property and the replaced item becomes NuPrime's property.
When a refund is given, your product becomes NuPrime's property.
OBTAINING WARRANTY SERVICE
If you purchased the product in the U.S., deliver the product, at your expense, to any NuPrime
Service Center located in the U.S. If you purchased the product outside of the U.S., deliver the
product to any NuPrime Authorized Importer in the country where you purchased the product.
Be aware, however, that not all countries have NuPrime Authorized Service Providers (‘NASP’)
and not all Authorized Service Providers outside the country of purchase have all parts or
replacement units for the product. If the product cannot be repaired or replaced in the coun
try it
is in, it may need to be sent to a different country or returned to the country of purchase at your
expense for repair or replacement. If you seek service in a country that is not the country of
original purchase, you will comply with all applicable import and export laws and regulations and
be responsible for all custom duties, V.A.T. and other associated taxes and charges. Where
international service is available, NuPrime may repair or exchange defective products and
parts
with comparable products and parts that comply with local standards.
You can always deliver the product to NuPrime’s U.S.A or Taiwan service center for obtaining
warranty service, however, you may have to pay for shipping cost.
NuPrime may send you user-installable new or refurbished replacement product or parts to
enable you to service or exchange your own product (“DIY Service”). Upon receipt of the
replacement product or part, the original product or part becomes th
e property of NuPrime and
you agree to follow instructions, including, if required, arranging the return of original product or
part to NuPrime in a timely manner.
When providing DIY Service requiring the return of the original product or part, NuPrime may
require a credit card authorization as security for the retail price of the replacement product or
part and applicable shipping costs. If you follow instructions, NuPrime will cancel the credit card
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