Aspen FR5 Speakers are very compact, mind blowing and great design from PS AUDIO. I'm very very impressed.

A good DIY project would be to build amps that run happily on the 48V DC battery supply. Eliminating the inverter and the AC to DC components of the amps would certainly work well. Leave the caps for a local power reserve and to filter any noise picked up and you'd be in great shape. Digital runs on 3.3V and some 5V supplies. Likely do well to leave them running on the inverted AC.

Those solar storage battery packs are supposed to be compliant with FCC (CE etc. depending on country) EMI (Electromagnetic Interference) regulatory requirements...I thought. But then I read that they can be exempt from the FCC Section 15, Part B requirements causing noise issues with an output that might look more like a square wave than a sine wave. So hey, perhaps Paul should take that as an opportunity to make FCC compliant "Audiophile energy storage" solutions with cleanest true to sine wave output to serve not only solar installations but also non-solar installations with battery backup. Non FCC compliant gear radiating RF noise in a home might cause other issues e.g. WiFi, Bluetooth, Z-Wave, Zigbee etc. becoming unreliable.

No one's dropped a 'Crapstone'(Devon) yet? There is also 'Twatt' (shetland), Shitterton (Devon), 'Bell End' (Worcs), Lower Swell(cotswolds), Ball Green(Kent)...etc etc.....must do some work now.......

My parents get a cleaner sine from their off-grid solar setup than I do in town. Don't cheap-out and you'll be fine.

Cant wait to hear the FR5’s. I hope they work in near wall placement,to the front wall i mean😁

No Paul, being in "Boulder" you SHOULDN'T laugh! 🤣 ... Sounds like something from, "The Flintstones!" "Yabba dabba doo!" The house I inherited from my late parents, has a solar array, and battery storage.

Everyone knows Cockfosters because it’s the end of the Piccadilly line.

@1:19 "...except, they don't make audiophile inverters." They might, even if those inverters are not intended for home use. Data centers (like Google, Microsoft, Thomson Reuters, etc), where they have $100,000,000+ sunk into those huge facilities, use high-quality, commercial UPSs (uninterruptible power supplies), delivering megawatts of pure sine wave power. Those UPSs do dual conversion, because those companies do not want their data centers to see a single watt from the public's power grid. Some of those computers, networking gear, firewalls, telecom equipment, etc, can be very sensitive to anything other than perfectly conditioned power. Data General used to make an MV series of computers that would fail from anything electrical that was not perfect. Atlantic Records, Thomson Reuters, ADP (Automatic Data Processing / payroll, etc) used to have those Data General systems. But they were fed by high-end, dual conversion, Liebert UPSs. Eaton's Powerware UPSs are another choice used in those companies. Now, those UPSs (the ones that can deliver multiple megawatts of power) cost more than most homes (perhaps all of the homes on the block). But maybe they provide the kind of accurate power that our host was describing? Powerware also makes dual conversion systems that are for small office and home use. The model in their "9" series do the double power conversion. The "9" series addresses the nine know power issues. Perhaps a "9" series UPS from them will have an inverter that is up to audiophile standards? I used to own a model 9130. Not sure if it is still current. They got silly expensive. So I switched to an APC unit with voltage regulation. Not as good. But it keeps my computers safe. My point is that there are seriously well made UPS systems that data centers use, and they probably will provide rock-solid performance. Anyone know what hospitals use? You know that they can't risk having any life saving equipment miss a single beat, or reset, etc. And what about in the operating room, in the middle of having open heart surgery, etc. Their power systems have to be of the highest quality -- with a price to match. Of course, PS Audio's Power Plants would be the right choice for your home stereo. My comment was intended to question our host's assertion that "they" don't make such inverters. I think that our host did not consider what is out there. He might have been considering what is at BestBuy, Walmart, and Costco. Not that we would buy a megawatt Eaton unit. But they do make them -- and they might be great for a high-end system. We will never know.

Correct, all hifi power supplies output dc from ac mains so just run the device directly with dc at the right voltage. Danny Richie at GR Research does just that. Ah, but then the market for fancy, expensive psu's would disappear and we wouldn't want that would we?

83 db spl efficiency for the FR5? Wow, that is really low.

It would really be something if PSA teamed up with a company like Tesla Wall to develop a high end DC to AC power supply/inverter system. The market would be audiophiles but also recording and mastering studios (that are increasingly in homes whose owners would be very happy to have solar power.) Also, I would like for you, Paul, to present the FR5 and FR10 to the studio market in addition to your regular marketing. I suspect they would make exceptional main listening "Wow the Producer" speakers.

I assume that most of these home batteries come as a part of photovoltaic system. If that's the case, then one has to watch for "PV energy diverters" that use excess solar power to heat the electric boilers etc. Problem is, that these diverters utilize thyristors and SSR relays with phase-angle power control which are causing extreme interference and noise in the all home AC circuits. Sometimes, even if a passive AC filter is used, the noise is still audible. Solutions exist, just be aware that this problem might be even worse than the low impedance of a home inverter itself.

Paul, you are correct not to laugh. Especially as you are from a Country with spray-on cheese.

The pursuit of perfection is never a bad thing, however I question why an amplifier that costs thousands of dollars cannot be designed to eliminate mains borne effects on the output signal.

it's not much to make it audio file quality inverter most of them are pure sine wave anyway just put a yx1 275V 1ferret capacitor across it output from the inverter. and you can connect the batteries directly it's the best way just jumper and the bridge rectifier just find out what the voltage is and feed it into the filter capacitors you don't need an inverter then. direct DC into the appliance just find the voltages it runs on.

Paul's 13 year old boy inner self...

Pure sine wave inverter and buy a good one. Outback makes them. Have a friend who runs these and he has zero noise in his audio system.

Should release a line of DC powered kit at 24V. Given each bit of kit currently has a transformer to convert AC back to DC. No mains hum👍

True Sine Wave inverters are available.

Careful Paul - you don’t wanna upset any cockney speaking future PS Audio customers from Cockfosters now do you ! 😮

I cannot understand why rotary converters aren't used ... you have a DC motor coupled to a three phase alternator and this will replace the static inverters ... much lower impedances and perfect sine waves all at precisely 180° will result ...

I can never get over cockpit either

The idea is to series batteries and connect to the secondaries of the power supply.

I know Cockfosters, it's on the Piccadilly Line.

Tee hee

Bypass the inverter and power supply. Send DC straight from the batteries to the amplifier rails.

What's in a name hein?

Audiophile products, it’s not a “mass production product “ it’s a hand made product as a Lamborghini, that’s exactly what some “audiophile factories”, don’t really realize . Full Stop.

That’s actually pronounced COfosters.

lucky he doesn't come from cockermouth how is your hand all that 😂😂

Paul, well you might snigger! The English music hall (vaudeville to you) comedian cracked a joke on - infamously prudish - BBC radio: I got on a crowded Piccadilly line train and the woman standing next to me said "Is this Cockfosters?". I replied "No lady, Miller's the name". Got him banned from the BBC!

I know what and what doesnt happens running on battery power. The AC off of the grid runs about 6% distortion and the voltage can vary tremendously. Ive seen 160v spikes on 120v circuit. Ive been running batteries- off grid- for over 12 years now. My Cotek inverter is up to 98% efficient and 3% distortion. I can play music for about 6-8 hours off 1 regular deep cycle marine battery. Stand alone system for the stereo and solar lithium for the house. There is no noise added to the signal.