Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.
All
S-4000 ProPower MK-II
reviews
Video Review
Manufacturer details
Features
Specifications
- Technology: Computerised lithium-iron-phosphate battery
- Capacity: 2,700 Wh
- Nominal battery voltage: 48 Vdc system
- Power inverter: dual power
- Input Voltage: 200-245 Vac or 100-130 Vac
- Input frequency: 50 or 60 Hz
- Transfer time: < 15 ms (on grid to off grid)
- Output voltage: 100-130 Vac or 200-245 Vac (pure sine)
- Output frequency: 50 Hz / 60 Hz +/- 0.05%
- Continuous output power: 950 VA @ 25°C
- Output power (3 min): 1,500 VA @ 25°C
- Output power (3 sec): 3,700 VA @ 25°C
- AC-Outputs: 4 x schuko (Furutech NFC) or 4 x duplex receptacles (pure copper rhodium plated)
Description
Technically, the S4000-ProPower occupies a special position because it marks the transition to the ultra-high-end range and thus also cuts a good figure in many recording studios. It is likewise a classic StromTank, and now in its latest version also one with 16 LFP-batteries (48 Vdc system) and two inverters.
Release Timeline
Manufacturer Site
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
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Avg. Product Price
$30,001-$40,000
Used For Sale
1
Available (Scroll Down)
Brand Popularity
481
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
5
Founding Year
Our take on the brand
Stromtank is unique among power conditioner brands for completely disconnecting audio systems from the power grid and using lithium iron phosphate batteries to deliver pure sine wave power. Their battery management system, developed with the Fraunhofer Institute, actively monitors and balances cells while handling both front-end and power amplifier components, unlike typical power conditioners that only support low-power devices.
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Our interview with the brand
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What competes at this price?
Stromtank
S-2500 Quantum MKII
30748
/
Released
Can you call it "the new middle class"? In a way, yes, but only if you orientate yourself within our device hierarchy. Otherwise, the S2500-Quantum is of course absolutely top class. In this model, too, we have implemented everything in line with our uncompromising approach.
Stromtank is unique among power conditioner brands for completely disconnecting audio systems from the power grid and using lithium iron phosphate batteries to deliver pure sine wave power. Their battery management system, developed with the Fraunhofer Institute, actively monitors and balances cells while handling both front-end and power amplifier components, unlike typical power conditioners that only support low-power devices.
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Our Summary
Product Strengths
- Improved speed stability of the Air Force Zero turntable during analog playback
- Increased resolution, improved enunciation, increased dynamics, and rendered background sounds more intelligible
- Helped clean up fracturing that could take place on some LPs when piano keys were vigorously struck in the treble region
- Lowered the noise floor, enlarged the soundstage, increased the sense of black backgrounds, retrieved additional detail, and fortified dynamic swells
- Amplified some of the inherent strengths of digital recordings, adding another level of finesse to the proceedings and intensifying tonal density
Product Considerations
- Plugging in amplifiers led to a somewhat more subdued performance—a 'plusher ride'
Takeaway: The S-2500 delivers on its promise to improve stereo performance and bring the listener closer to the musical truth. It has many positive effects and no negative effects.
Video review
Our take on the brand
Stromtank is unique among power conditioner brands for completely disconnecting audio systems from the power grid and using lithium iron phosphate batteries to deliver pure sine wave power. Their battery management system, developed with the Fraunhofer Institute, actively monitors and balances cells while handling both front-end and power amplifier components, unlike typical power conditioners that only support low-power devices.
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