Matching Speakers to amp


I currently own a PSA Stellar 300 paired with Focal Aria 926. I just picked up a used pair of Quad S-5 and I will be comparing the sound. I am not good a using technical specs to compare so I could use some help if anyone has the time to take a look at the amp & speaker specs below and give me some feedback I would greatly appreciate.
The basic question is: from a specification standpoint which speaker pairs up with the Stellar 300 best?


Stellar 300
Gain30.5dB +/-0.5dB Sensitivity for rated output power1.01V Noise1kHz@300 Watts <-100dB Input impedance S300Unbalanced 50KΩ
Balanced 100KΩ Input impedance M700Unbalanced 50KΩ
Balanced 100KΩ Output Impedance50Hz, 2.8VRMS <0.007Ω Damping factor50Hz. 2.8VRMS
8Ω >1100
4Ω >550 Frequency Response@2.8VRMS
10Hz – 20KHz +/- 0.5dB
10Hz – 50KHz +0.1/-3.0dB
Output PowerBoth channels driven 120vac mains, 1kHz, 1% THD 8Ω140W minimum 4Ω300W minimum 2Ω Stable for musical transients

Quad S-5
General description 3-way floorstanding speaker
Enclosure type ABR
Transducer complement 3-way ABR 165mm x3 Bass driver 165mm Woven Carbon fibre Cone x2
Midrange driver 125mm Woven Carbon fibre Cone Treble driver 12 x 45 mm
True Ribbon Sensitivity (2.83V @ 1m) 90dB
Recommended amplifier power 25-175W Peak SPL 112dB
Nominal impedance 6Ω
Minimum impedance 3.2Ω
Frequency response (+/-3dB) 42Hz ~ 23kHz Bass extension (-6dB) 35Hz Crossover frequency 570Hz & 3.2kHz

Focal 926
Speaker driversTwo 61/2" (16.5cm) Flax bass61/2" (16.5cm) Flax midrange1" (25mm) Al/Mg TNF inverted dome tweeterFrequency response (+/- 3dB)45Hz - 28kHzLow
frequency point - 6 dB37HzSensitivity (2.83V / 1m)91.5dBNominal impedance8 OhmsMinimum impedance2.9 OhmsRecommended amplifier power40 - 250WCrossover frequency290Hz / 2400Hz











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Georgehifi is totally incorrect with his response.

I have dynaudio focus 160s being driven by a stellar s300, with a naim nac 202 preamp. The bass is endless, and the amp absolutely SINGS with these tough to drive dyns which have a nominal impedance of 4 ohms, sensitivity of 85db. 

The bass abilities of the amp are absolutely incredible....It seems like it should weigh 100 pounds, given how it controls the speakers.

I've driven these speakers with everything from adcom monoblocs to a luxman and the stellar does a better job than anything i've had in this system.
.@johnkent3...…………………………………….

As George said, they will NOT do 2 ohms, 4 ohms is a different matter entirely
johnkent316 posts07-06-2018 9:56pmGeorgehifi is totally incorrect with his response.

I have dynaudio focus 160s being driven by a stellar s300

I understand, you love your amp and are sticking up for it.

But like I said into the OP’s speakers " it will work into them and probably sound fine." But may not perform at their best. 

But your speaker may not have the loading that the OP’s do. (I will try to find it for you.)

I’m just pointing out the tested/measured specs behind it with the OP’s two speakers.

Cheers George
Your Dynaudio 160 have never had an impedance graph done on them, but the 140’s do which is the same family. And yes they are far more easier to drive than the Focals or the Quads of the OP's.

https://www.stereophile.com/images/archivesart/506140FIG1.jpg

Cheers George
Thanks for the responses.

First impressions. The Quads are beautiful. Love the finish and the base assembly. The base is really classic looking and solid and just absolutely anchors to the speaker to my hardwood floor. Makes the Focal’s base look like something from Wal-Marts.
My sourcesProject TT Sumiko Cartridge
Rogue Audio RP-1 with Mullard TubesBlue Jean interconnectsPS Audio entry level power cablesEntry level Audio Quest Cable (need recommendation here for $300 budget)cheapo sony CD player digital out to Wadia 321.

The Focals fill up the room with a blooming warm sound when I switch to the Quads the sound stage shrinks but man does it get accurate, the bass is reserved but tight as dick’s hat band, transients are distinct. For example Dire Straits Wild West End, the striking of the wood block is right out front , right in the room. With the Focals the block is more in the back and mildly vague but smooth. On the Quads when Knopfler made the first few string plucks on that song the hair on my neck was up . " Stepping out to Angellucci’s for my coffee beans... " On the song In The Gallery Knoplfer grunts and growls out the lyrics. The way the Quads delivered the nuances of his voice had me giggling.

Steely Dan’s, Turn that Heartbeat over again. The Quads delivered the bass line on the song so nice and clear. But when Fagan shot his voice into the higher register the Quads seem to shreek where the Focals kept that in total control.
Where are my alligator clips!


Miles Davis Sketches of Spain from Mofi Vinyl. Similar experience, more warmth with the Focals. But right at the beginning is some rattling of wooden objects like wooden sleigh bells, barely audible on the Focals but just perfect with the Quads. Miles trumpet more edgy with the Quads and a bit to much up higher for my taste. But the Quads resonating the strings and reeds beautifully. Then about half way through Concierto De Aranjuez Miles plays a minute or so of low notes and the Quads made it sound like he was right in the room.
John Cougar Scarecrow. I like the engineering on this album. Kenny Aronoff whacking the snare throughout. This is where I like the Focals better and probably why I picked them over the Sonus Faber when I demoed them side by side in my system. I guess maybe the Focals are better overall for my listening habits. Do they take the edge of R&R ?. But the Quads did a saweet job layering in Ricky Lee Jones voice on tune Between a Laugh and a Tear.

CD’s
Television, Elevation from Marquee Moon although I loved the way the Quads made Verlaine’s Jazz Master sound they made his voice almost unbearably shrill a certain points. Where the Focals mask that. But then on the following tune, Guiding Light, His voice sounded really nice and I could turn my attention to the nice bass line coming through.

Miles Davis Black Satin from One the Corner
This album is really wild with almost of cacophony of sounds (sax,trumpet,tabla, electric sitar. The Quads again very precise with the Tabla sounds and the reed resonance but with this type of music of wonder if I would fatigue. Again the Focals get the nod.

If I was primarily listening to classical and maybe jazz the Quads would get the nod. I like @roberjerman’s idea of keeping them both. Which leads me to the reason I have the Quads at all. One pair is going to end up at my sisters house. I expect the Quads will eventually end up there so I now need to search for an integrated amp around the $500 to $600 range to push these things.