Reputable manufacturer and quality construction.

This is something I recently learned over the course of many years and a lot of troubleshooting! If you have a 7.2.4 Dolby Atmos setup which uses an AVR, external amps, and subwoofers I highly recommend using a 0awg huge extension cord to draw electricity from a completely different circuit! The results are significantly better and very qualitative. I admittedly have 3 power conditioners for my home theater setup, which includes: Denon AVR-x4500h, 2 REL Subwoofers, 2 external amplifiers, dacs, a headphone tube amp. A TV, and a few other items. The reason I went for a second circuit is because I was overloading my single circuit with too much AV gear and a result, my monolith m7100x amp was generating a lot of static when it was powered on and not playing (in all channels), after trying a ground loop hum isolator, an isolation transformer, art clean box pros ( to have a true, balanced XLR connection between my avr and monolith amp). And trying three different power conditioners: the Audio Quest PQ4, the Paramax 4300, and the furman PST-8D nothing reduced the static. Also, the dynamic range if all if my devices sounded limited. I used this extension cord to power my PQ4 from a completely different circuit and I immediately noticed a significant reduction in static coming from my monolith amp. My PQ4 currently powers my TV, AVR, and 2 external amps. Drawing electricity from 2 different circuits to power my home theater system hobby made my listening experience come to life as there is now a significant dynamic range and all of the sound has become rich and much more alive. I also added pictures of 6” extension cords you can buy in a 6 pack. I mention this as most power conditioners do not have a lot of room between outlets. Using these 6” three prong extension cords have allowed me to plug in large usb adapters that would have normally taken up the space of 2-3 outlets and now only takes up 1 outlet so all of my devices can be plugged into power conditioners negating the reach to buy upgraded ac cables. In conclusion I have found using 2 separate outlets for you AV system makes the sound really come to life and can even reduce a ground loop hum that nothing else can fix. FYI, I have gone through 3 monolith m7100x amplifiers and they all hum. I do know it’s specifically the monolith amp as when the monolith amp has been shipped off for replacement through their warranty program my Denon AVR-x4500h and Emotiva Bass X 3 channel amp powered all of my speakers with no hum. Note: I did unplug all if my devices AC power one at a time, and all cords one at a time. The only interesting find was that I found if I plugged my laptop into my docking station via HDMI the hum from the monolith got worse, so I plug the HDMI Cable and the Ethernet cable directly into my work laptop and only use the docking station as a power supply for my laptop as unplugging the dell docking station from the AC outlet did not impact the hum from my monolith amp.

Système de protection non sacrificielle et sans entretien avec nombre de joules illimités avec Technologie de filtrage linéaire pour supprimer le bruit et une protection en mode série contre les dangers de surtension extrême.

Power cord is heavy duty but flexible. There was no discernible noise reduction in my stereo system and I didn’t expect any. I don’t know if it is better than other surge protection power bars but if build quality and mass have anything to do with it then it’s got to be good.

Replaced a 10 plus year Monster Power Home Theatre Power conditioner that started to make a buzzing sound with this Furman PST replacement.The unit cleaned up the back ground noise superimposed on the incoming AC line that the White area of the video became whiter and brighter.

Pésimo vendedor, el producto funciona pero no es el modelo. La entrega demoro diez días más de lo acordado y tuve que pagar impuestos.

Purchased this Furman PST-8D after reading several positive reviews of music studio applications. I have a persistent AC buzz/hum problem in my music studio downstairs in my home which affects my electric guitar and bass rig. I was disapointed to realize this made no difference whatsoever. My rig is pretty straightforward: guitar/bass either straight into a Roland Jazz Chorus transistor amp, or through a Boss GT-100 guitar effects processor. Even without the amp, using headphones out of the GT-100, the noise is there. On the upside, this unit is built like a tank! It's large, roughly 2 feet (60cm) long and about 5 pounds (2kg). Not exactly portable to carry around for a quick gig, but seems very solid to use at home.

Great product, built to last for ever... it's big but ok for me, I knew before I bought it.

Works exactly as advertised, good amount of plugs with extra spacing on some for largs blocks. Filters all audible static out of my audio system.

Arrived on time, works as advertised, it is a bit bulky, however layout of the receptacles is well done.

When i received the power conditioner there was a rattling sound of something sliding around inside the unit. I removed on of the plastic endcaps and found a ten inch strip of plastic. I removed the bottom cover and found that the plastic strip was one of the insulating guide rails that sits it between the main circuit board and the metal housing. On one side of the board the plastic insulating guide rail was correctly installed, on the other side the circuit board was screwed directly down to the metal housing. I removed the circuit board, installed the plastic guide rail, and reinstalled the circuit board. After putting everything back together I plugged it in and it has been working great. I suspect that whatever automated machine puts these things together must occasionally misplace these plastic insulating guide rails. I did not try plugging it in before opening it up, so there is no knowing whether it would have worked ; however since the main circuit board was screwed directly to the metal housing I have to assume it would not have. I saw one other reviewer mentioning a rattling sound in their conditioner, perhaps it's the same problem.It was an easy fix, however there are large capacitors inside this thing, so the risk of electric shock, even when not plugged in, is real since capacitors can hold a charge for a very long time. I never plugged my strip in so the capacitors were never charged in my case. I don't recommend people open these things up unless you are aware of how to take the appropriate precautions.In any case, I believe any and all devices made, whether coffee makers, tvs, power conditioners, or anything else, all have a small percentage of defective units. For that reason I feel I should base my review on the performance of the fully functional device, as that is what the vast majority of people will likely receive.After fixing the unit, I plugged all of my home theater devices into it, and everything has worked beautifully. Previously there were humming sounds coming from my receiver, hissing from my speakers,and humming from my subwoofers. This power conditioner eliminated the hissing and reduced the hum. I was able to eliminate the remaining hum by switching my htpc to one of the digital/video outlets on the strip, which seems to isolate it from the audio components. Perhaps there may have been some noise from the htpc power supply dirtying the power going into my receiver and speakers?I finally have a hum free audio setup, and I could not be happier. As far as audio and video quality improvements go, I don't have any easy way to do AB testing, but the whole setup is silent when not playing any audio. The unit is rock solid, it appears well built despite the fact that my particular unit was flawed (but fixable back to perfect). For the record I did speak with tech support at Furman, and they suggested I send the item back, however it was so easy to resolve myself I didn't see the point. The mainboard itself was undamaged, and reinstalling the insulating guide rail was two minutes of work.I still give this thing five stars, thanks.

We first became acquainted with power conditioners about 7-8 years ago. Our new valve amplifier system using vacuum tubes required two valve replacements within a matter a several months after purchase. Upon expert recommendation and a diagnosis that our AC power was rather noisy, we purchased a power conditioner manufactured by Monster Power, retailing well over $400. Since its installation, we have had no problem with the said amplifier ever since.This Furman PST-8D power conditioner purchase was inspired by a different purchase of higher-end speaker system for computer and home theatre system in a different room, as well as a past failure of another somewhat cheaper PC speakers. So this PST-8D is protecting the TV, computer, speaker, and a whole lot of other electric components. None of us can see any difference is audio or video qualities because of the power conditioner. The Monster power conditioner protecting the more expensive valve amplifier system also does not change the audio quality in any way, so we did not expect the Furman PSD-8D to improve audio quality either.Our hope is that power conditioning prevents damage from typical spikes in AC electric current for various electric components including the new speakers. Vacuum tubes are probably more liable to be damaged by irregular currents than solid-state components, so the protective value might not be great. Who knows? PST-8D is supposedly a much better surge protector and is non-sacrificial, so that's a definite plus, although we'd rather not find out.One really impressive aspect of this Furman PST-8D is its size. It's huge! The picture shown on Amazon does not give a good impression about how big this thing is. Everyone was quite stunned by its size.This item and PST-8 (without isolated banks of outlets) are the cheapest Furman product with LiFT filtering technology. If you are happy with older filtering technology, Furman PST 2+6 is currently less than half the price at Amazon and is the cheapest option at that level. Despite Amazon's (false) description, Furman SS-6B Steel Power Strip with 6 Outlets is NOT a power conditioner.

This review is for the "Furman PST-8 and PST-8D"OVERVIEW:-----------This is a quality/value sweet spot for AV (Audio-Visual - TV's etc) SURGE PROTECTION, NOISE FILTRATION, and POWER CONDITIONING (Note: not voltage regulation) in the power strip form factor. This is superb quality from a highly respected name in audio/music equipment .. and you'll pay a bit of a premium for it.The PST-8 and PST-8D are the entry point for a higher class of surge protection that also gives you other A/V-centric benefits (and some negatives) I'll cover below.The main DIFFERENCE BETWEEN the PST-8 and PST-8D is that the PST-8D breaks up the 8 outlets into 2 separate isolated banks of 4 outlets, much like the well-reviewed Tripp Lite HT10DBS and Isobars have isolated filter banks.Note: If money is no issue, may I suggest also looking at SurgeX products for just surge protection or the Furman Elite-20 PF i for surge protection and AV benefits as good money-is-no-object starting points. Alright, back to a quality/value sweet spot for premium surge protectors with other AV benefits in the power strip form factor.Tripp Lite HT10DBS vs. Furman PST-8/PST-8D:--------------------------------------------Before getting into the pros/cons of the Furmans, I suggest if you are looking at them to also look at the well-reviewed Tripp Lite HT10DBS, perhaps the closest AV premium surge protector cousin in this form factor. It is a premium offering with technical quality and value, is less expensive, the company takes surge protection seriously, and it may meet all your needs.For a step up in expense for surge protection in the power strip form factor, with the PST-8 or PST-8D you can get an incremental increase in quality of surge protection with some additional AV-friendly benefits covered in the Pros below. Whether the additional expense for the Furman is overkill for your needs or a no-brainer is clearly dependent on your needs and budget.PROS:------SURGE PROTECTION:(1) UL1449 3RD EDITION TESTED (see below for details) with 188V PEAK CLAMPING VOLTAGE (which is 133V RMS) which is superb. This test is the UL gold standard for surge protection. I would have gladly settled for 330V "let-through" clamping voltage, however, 188V max better protects equipment from both the killer surges and the little transient ones that can shorten the life of your equipment.(2) EXTREME VOLTAGE SHUTDOWN (EVS). At 137V over voltage (think defective neutral line) and at 90V under voltage (think brownouts) it will cut the equipment off completely (using a power relay), returning power when the under/over voltage event is over. This protects its own MOVs and the protected equipment from over-voltage events that are prolonged enough to overwhelm the defenses of most equipment.(3) NON-SACRIFICIAL. This isn't designed to be a disposable "sacrificial" unit. This is designed to be highly survivable in addition to doing its job of protecting your equipment. How non-sacrificial it is compared to other truly premium surge protectors like the ISOBARs, HT10DBS, etc. depends on who you talk to. It has a circuit breaker.(4) JOULES RATING TO INFINITY AND BEYOND. Furman claims Joule ratings don't apply to this surge protector because no amount of electrical energy pulse within reason, short of perhaps a direct lightning strike for example, will defeat the unit and head on through to your equipment. Given Furman's reputation in the audio/music business and the kind of equipment they are expected to protect, I choose to believe their claim.PERFORMANCE:(5) EMI/RFI FILTERING (attenuation of transverse mode noise) is up to 80dB (frequency dependent), which is excellent. Furman is one of the only companies that makes premium surge protectors that promotes their EMI/RFI noise attenuation vs. frequency curve (spectral distribution of noise) as a sales tool, which is very impressive .. and very Furmany of them. I've tried to find alternative sources of that data from the other premium surge protector companies including asking their engineering departments without success. Here are some example data points in the spectral distribution of noise below, I am working with Furman to get some numbers in the human hearing range which I will add at a later date.- 150kHZ to 100MHz up to -40dB noise attenuation- 100MHz to 1GHz up to -80dB.My wild estimate based on their linear curve claims:- 10MHZ est. -60dB noise attenuation- 1MHZ est. -50dB " "The value of the PST-8/PST-8D's selling of the above mentioned curve is you can easily have a device declaring a higher maximum dB noise reduction but that is only one point on the spectral distribution of noise curve and the noise reduction overall might be poorer elsewhere.I should note that even if EMI/RFI noise attenuation helps you, at some point you are hitting serious diminishing returns and it becomes marketing.Furman claims their LiFT (Linear Filter Technology) is also superior to many other products' noise reduction in that it reduces noise EVENLY across such a BROAD RANGE OF FREQUENCIES in a LINEAR manner, that is increasing noise attenuation (dB) as we move towards higher frequencies in a linear-ish manner. They infer that AUDIO can be greatly enhanced by this type of reduction in AC line contamination and noise, and that VIDEO can be improved in "SHEEN, BRILLIANCE, BLACK LEVEL, and BLACK TO GRAY DEFINITION". You be the judge now that you know what they think could improve.I should mention that whether power conditioning improves VIDEO at all is hotly debated. Some folks say they see a video improvement ranging from a little to a lot, many more folks say their AUDIO improved significantly. There are likely to be big environmental variables to all this .. what your power is like, what equipment you have, etc.(6) ISOLATED OUTLET BANKS (PST-8D but not the PST-8). Some equipment send more noise than others back down their AC cords. The isolated outlet banks eliminate interference between equipment in these banks. The PST-8D has 2 groups of 4 outlets each which are isolated from each other. For example, you might isolate equipment with motors like DVRs and DVD players, and certainly analog equipment, amps or speakers, from noise sensitive equipment like TVs. See below regarding related silk-screen error.(7) "ZERO" GROUND CONTAMINATION. Ordinarily if the clamping devices or AC filters in surge protectors have any leakage to ground, AC line noise can find its way through the circuit panel and back to the ground of your A/V or computer components. Furman claims it cannot have any leakage to ground, period. I have made no attempt to validate the claim nor understand whether this is a concern for most environments.(8) COAXIAL (Cable) SUPER LOW 0.1dB INSERTION LOSS, which is superb. The benefits of surge protection with minimal signal loss.GENERAL:(9) Furman has a 30+ year strong technical reputation, especially in the professional and prosumer music, audio, and broadcast industries. So these guys know AC Conditioning and Surge Protection, it is only a question of whether they bring it to the PST-8 and PST-8D and I think they do.(10) I found Furman highly responsive to technical questions about their product, more so than any other company selling surge protectors. I found them able to discuss meaningful detail, not just read marketing fluff. I was impressed.CONS:------(1) No ground fault or outlet wiring error alert light, the "protected" light doesn't help with this. You might want to test the outlet with another surge protector that has one or buy a cheap little receptacle tester.(2) There is no RJ-45 Ethernet surge protection on these. One can always get a SEPARATE Ethernet (RJ-45) surge protector (preferably one that can handle 1 GIGABIT ETHERNET since it is so common now). With all the smart TVs, wired Roku like devices for quality, dual purpose for computers, etc., there really should be one at this price range.(3) The Product Warranty and Connected Equipment Warranty is only 3 years. If you don't register your warranty within 15 days it goes down to 1 YEAR, the latter obviously not a customer friendly Warranty stance compared to some of their competition.(4) The phone line surge protector protects only the 2 skinny lines that serve the one house line (which is by far the most common home set-up). For example, if you paid for 2 house lines this product will only surge protect the skinny lines supporting 1 of the 2 house lines.(5) The flat wall plug is not secure for internally wobbly wall sockets causing connect/disconnect with very little movement. Of course, that probably means you should replace your wall outlet more than anything. By comparison the HT10DBS plug is rock solid in the same wobbly outlet. For stable wall sockets there is no issue. Outlet physical instability is in-wall so you'll need to test to know if this is an issue.NOTES:-------(1) There is a SILK SCREEN ERROR that incorrectly shows only 2 outlets isolated from two other outlets. Furman engineering tells me it is actually the first 4 outlets isolated from the next 4. Furman customer support says they passed back this error (2/2013), please comment if you see it fixed.There is also an issue with ILLOGICAL NAMING of the outlet groups that has led to some confusion out there. The silk screen naming suggests there is a functional difference between the 2 isolated groups of outlets, Furman engineering confirmed they are the same.They moved manufacturing to China so it might be some time before any fix makes it through to a unit.(2) Several words are missing first letters on the packaging showing more lack of attention to detail. Not sure if this tells us much about the product quality, but there it is.(3) There is no Ethernet line (RJ45) surge protection. If they ever add it I suggest it work with modern gigabit Ethernet, many surge protectors haven't upgraded for that.(4) The EMI/RFI noise attenuation is for all AC outlets, not the coaxial cable nor tel/fax line so as not to impair their signals.(5) If the outlet isn't grounded, surge protection won't work (however you would get the outlet EMI/RFI noise reduction).(6) This is 19.75" x 3.5" in case the size is an issue. It is heavy and feels very substantial, a full 5" longer than even the big Tripp Lite HT10DBS. It still should be able to hide behind most A/V cabinets I would assume.(7) If money is no object, the NEXT SIGNIFICANT TECHNICAL STEP UP is the FURMAN ELITE-20 PF i 13-Outlet Ultra Linear AC Power Source (NOT the Elite-15).UL1449 3rd EDITION - WHY DEMAND IT ATTHE MINIMUM FOR YOUR SURGE PROTECTOR:-------------------------------------------Okay, so you read somewhere that you want a UL1449 verified/tested product and preferably a 330V max let-through clamping voltage, UL1449 3rd Edition became effective 09/2009. Any surge protection device (SPD) made after that must meet the new tests to be UL1449 verified. Why choose a product that meets the new edition of the certification (much less meets any old UL1449 cert.) if you are serious about protecting your equipment? Here are two reasons:(1) It added a STRESS TEST for Type 3 SPDs like this called the Duty Cycle Test. They electrically whack it 15x to see if they can ruin its ability to protect, cause a fire, etc.(2) The UL1449 3rd Edition tests with 6x MORE SURGE AMPERAGE than the 2nd Edition test did.WARNINGS/SUGGESTIONS:-------------------------- Plug this directly into wall socket, DON'T DAISY CHAIN extension cords.- If socket is ungrounded, surge protection won't work, be sure warning light shows socket has ground. At least you'll get EMI/RFI noise reduction for the outlets, but without ground you've got an extension cord not a surge protector.- If you are serious about surge protection from nearby lightning strikes or power line events, be sure to get WHOLE HOUSE SURGE PROTECTION in addition to these kinds of surge protection units (unit and installation can be as little as $200ish plus permit cost). Note: Be sure your whole house surge protector has status indicators, otherwise it can become useless and you may never know.- Under UL 1449 3rd Edition, these kinds of surge protectors are Type 3, which are partly defined as being 30'+ from circuit breaker box. This is why you will see references to premium surge protectors being 30ft. from a circuit breaker box.SOME OTHER UL1449 3rd EDITIONSURGE PROTECTORS:---------------------------------- AV-FOCUSED ISOBAR SURGE PROTECTOR:- ISOBAR:- ISOTEL:- AVBAR:If you are wondering, Monster doesn't publish anywhere if they are UL1449 3rd Edition verified nor do they publish their noise reduction/attenuation values, neither online nor on-box. I confirmed this status with them. They are presently internally debating whether to do so someday.INTERESTING FORUMS:----------------------avsforumhometheaterforumecousticsSOME RELATED PRODUCTSOTHER UL LISTINGS:-------------------------UL497A/UL1459 - Relates to Telco (ex: RJ11 protection in our case)UL 991 - Tests for safety-related controls using solid state devicesUL 1283 - EMI Filtering for these kinds of unitsUL 1363 - "Relocatable power taps" (think extension cords) with or without EMI filtering or surge protection