Quad S-2 loudspeaker Specifications

Sidebar 1: Specifications

Description: Two-way, rear-ported, stand-mounted loudspeaker. Drive-units: 0.5" by 1.75" (12 by 45mm) True Ribbon tweeter, 4.9" (125mm) woofer with woven Kevlar cone. Crossover frequency: 3kHz. Frequency response: 48Hz–22kHz, ±3dB. Bass extension: 37Hz, –6dB. Sensitivity: 87dB/2.83V/m. Impedance: 8 ohms nominal, 4.5 ohms minimum. Peak SPL: 98dB. Recommended amplification: 25–150W.
Dimensions: 13" (330mm) H by 7.1" (180mm) W by 10.25" (260mm) D. Weight: 13.5 lbs (6.1kg).
Finishes: Black Oak, Sapele Mahogany, Piano White or Black.
Serial numbers of units reviewed: QH01548BCF0013 (both).
Price: $999/pair. Approximate number of dealers: 15. Warranty: 2 years.
Manufacturer: Quad, IAG Group Ltd., IAG House Units, 13–14 Glebe Road, Huntingdon, Cambridgeshire PE29 7DL, England, UK. Tel: (44) 1480-52561. Web: www.quad-hifi.co.uk, www.iaggroup.com. US distributor: MoFi Distribution, 1811 W. Bryn Mawr Avenue, Chicago, IL 60660. Tel: (312) 738-5025. Web: www.mofidistribution.com.

US distributor: MoFi Distribution
1811 W. Bryn Mawr Avenue
Chicago, IL 60660
(312) 738-5025

Axiom05's picture

"Although the tweeter's output leads that of the woofer, their outputs meld relatively well, even if this graph does suggest that the optimal blend occurs just below the tweeter axis."

From the graph, how do you determine that the optimal blend is just below the tweeter axis? Thanks!

John Atkinson's picture
Axiom05 wrote:
From the graph, how do you determine that the optimal blend is just below the tweeter axis?

That very slight discontinuity in the step response just below the time axis at approximately 3.8ms suggests that the woofer's output needs to be moved forward in time a little. This could be achieved by moving the listener's ears down or the speakers up an inch or so.

John Atkinson
Editor, Stereophile

Axiom05's picture

I see that this same discontinuity is seen between the tweeter and the midrange of the B&W 800 Diamond and the 802 D3. This is consistent with the fact that the intended listening axis is just below the tweeter axis and why these speakers usually need a little forward tilt to sound best.

supamark's picture

those are some unusually dimensioned rooms... your building must be very very old.

ken mac's picture

No, really.

supamark's picture

Old houses/buildings always have weird dimensions. Everything is a "one-off" design. Hope (for your sake) it's rent controlled lol, that's become some mighty expensive real estate. Visited Manhatten before Guiliani was mayor, was a fun and interesting place (that sadly no longer exists).

Charles E Flynn's picture

From page 3 at http://www.quad-hifi.co.uk/upload/files/manual/20150817100845_23.pdf :

Quad crossover networks separate the treble and bass networks into two distinct sections, each connected by a dedicated pair of terminal posts. The enables the treble and bass components to be separately driven for optimum performance.

ken mac's picture

I would've loved to bi-wire these monitors for the review, but I have no bi-wire cables. Something to consider, for sure...

Charles E Flynn's picture

AudioQuest has an interesting set of recommendations regarding bi-wiring at http://www.audioquest.com/resource_tools/downloads/literature/learning_modules/Understanding-BiWiring.pdf .

They make two potentially strategy-altering points that I have not seen widely discussed :

"Is BiWiring so important that you should spend twice as much on speaker cable?

BiWiring is actually a way to get higher performance for the same expenditure. The BiWiring question is not about how much money to spend, but how to maximize performance and value."

Later, the article has a diagram showing how a speaker that is capable of being bi-wired should be wired if it is not being bi-wired. The diagram is contrary to what many speaker makers show in their instructions. I asked a local dealer about this diagram, and he replied that "Everybody at the trade shows knows about this and wires their speakers that way." The relevant section is titled "Using Full Range Cables On BiWire Capable Speakers".

spacehound's picture

That well-known purveyor of snake oil sold via pseudo-scientific total gibberish, just wants to sell you twice as much of its overpriced lengths of wire.

"Full range cables"?

At the frequencies that even the best speakers are capable of even a straightened coathanger is "full range" and will supply far more current than any speaker will ever need.

Ortofan's picture

... now:

Charles E Flynn's picture

Thanks for taking the trouble to find the current link for the Audioquest article about bi-wiring. I think it is worth saving the pdf for future reference.

DougM's picture

Seems to be an awesome little speaker for $999. I like the way many more manufacturers are using ribbon or AMT type tweeters these days. And, the IAG family of companies is really making some great affordable stuff, another example being the Diamond series from Wharfedale. I have the older Diamond 9.1s, and they sound great. And you gotta love a reviewer who uses Chet for some of his test discs. Great Taste!

ken mac's picture

I had the 10.2, absolutely wonderful speaker. Chet is the best!

Charles E Flynn's picture


ken mac's picture


mrkaic's picture

I have pair of slightly cheaper Quad S-1's and I drive them with a Quad VA-One. One gnarly combo, warmly recommended.

spacehound's picture

There are so many of these around at all sorts of prices that the speaker industry will soon be able to offer every hifi enthusiast in the world a different one.

Long-time listener's picture

"Both recordings presented nonfussy senses of immediacy and intimacy."

Senses? Excuse me, but hearing and sight would be two different *senses.* But since the immediacy and intimacy you speak of both came to you via your hearing, why not write, as everyone else does, "a wonderful sense of immediacy and intimacy." Forest here, not trees.

gbougard's picture

These speakers look yummy as hell, yet after reading your review, I don't know if those are for me
I produce Jamaican music with Sly & Robbie, one of the world's HEAVIEST rhythm sections, and love to listen to Reggae, Dancehall Hip Hop and Funk.
All these musics are bass and drum-heavy and the music you use to evaluate the speakers is not.
So do you think you could pop a record like DUBRISING by Sly & Robbie and crank it all the way to 11 and report back to me with your impression on how these speakers behaved when subjected to real drum and bass and heavy beats.

iListen's picture

Which integrated would you pair with these?
Quads own? or the Sphinx?

toofastdad's picture

I just ordered a pair of Quad S2 speakers, do you think that pairing them with a NAD 3020 will have favourable results?

toofastdad's picture

Using the above combo Sly & Robbie sound amazing, the bass is very warm and rich — great speakers, I'm really pleased with my purchase. I just ordered a Musical Fidelity M2Si amp which I guess will make these babies sing. Joe Cocker's Sheffield Steel sounds really good (Sly & Robbie on drums and bass).

Oldoiler 1963's picture

You probably already have them and are enjoying them by now. I use a 20w Cary amp and the sound is amazing.