Mini-review: Tannoy Mercury M20 hifi speakers

I have Dad to thank for my love of all things hifi and all things musical – and somehow in December he agreed to let me give a new home to the core components of the hifi system that started it all.

The components I’ve grabbed so far are:

  • Pair of Tannoy Mercury M20 speakers, with matching Target spiked stands
  • NAD 3020B amplifier
  • Dual 505-2 turntable

After unloading, I figured the mains-powered electronics would need some time to warm up to prevent condensation due to having spent four hours in the boot of a very cold car causing problems. So the first thing I did (after pouring myself a hearty Whisky Mac) was to get the speakers running with my existing gear – a 15-year-old NAD 302 I bought new in 1995, fed by iTunes played at 88.2KHz 24-bit through an EMU 0202USB audio interface from an elderly second-generation iMac.

To provide a reference point: my previous speakers were an unknown-model 3-way Magnat design, each employing a 1″ metal tweeter, 2″ high-mid paper cone, and an 8″ mid-bass treated paper cone. These were themselves a bit of a bargain when I found them. The cabinets about the same size and shape as the Tannoys, and when purchased new I would guess they were at similar price-point.

I’ve grown used to a slightly over-loud treble from the Magnats – perfect for the room I originally bought them for, but not so good in larger, more open spaces with less damping, such as a typical open plan living-room/kitchen/dining-room that they’ve served for the last year or so. Though well-extended, the Magnat’s treble delivery doesn’t quite sound ‘real’, and they could have trouble delivering a stable, centred lead vocal. Since each cabinet measures the same response using RTA/pink noise, and the drivers/cabinets are undamaged, I’ve yet to find a cause for this. Otherwise their sound was slightly warm and reasonably accurate, though I did find myself removing the bass-port tuning tubes to provide a more natural, dynamic bass-line. Curiously this also extended the the audible bass response by another octave.

By contrast, the Tannoys are a two-way design using a 1″ silk dome tweeter paired with a translucent white plastic 8″ mid-bass driver. Their sound is much warmer and smoother than the Magnats, with well-defined bass-notes that don’t noticeably allow any one bass note to play louder than any others. Upper bass notes are actually slightly less prominent than I’m used to, but there is a stronger and more accurate response below 100Hz, allowing kick drums and sub-bass lines to underpin the mix even at very low volumes. The sub-bass lines of any material I’ve played through them have shown they can keep up with the rhythm of even the fastest Prodigy or Underworld tracks, as well as allowing movie soundtracks enough bass to not need a sub.

What I remembered about these speakers in their original home was that they hold their soundstage together at extremely low volumes – this bodes well for micro-dynamics at more normal listening levels, but also allows for very enjoyable late-night listening when everyone else has retired to bed.  At more ‘normal’ listening levels (around 60-90dB depending on source and time of day) these speakers really come into their own, painting a very natural image and revealing the differences between recordings like nothing else I’ve spent significant time with.

I would say the real magic with these speakers has to be the way they present vocals. They don’t do the usual high-end hifi fancy trick of making the vocal sound like it’s right in front of you and about to take your face off – and I’m aware that some might say this is a bad thing. Instead, they present vocals in a way that seems effortless and yet somehow forces me to hear every last word, and they seem to do this without obviously emphasising any particular frequency range commonly associated with vocal intelligibility. It’s almost distracting at times – a song playing in the background suddenly demands attention in a way I’ve not experienced before. That is a stunning achievement now, but somewhat surprising considering I’m listening to boxes made some 25 years ago. Really, my only criticism of these speakers is that the treble doesn’t seem to obviously reach as high as I’d like. Anything above around 13KHz seems slightly muted.

This has been a lot of fun – these are speakers I can live with for daily use, yet are revealing enough to tell me when something’s not right in the recording or the playback chain.

And finally: thanks Dad, for letting us rob you that Saturday afternoon!

Update – 5th January 2013

Turns out that the speakers we have may not be the “Golds” that we all initially thought they were.  Ours are single-wired and marked as Mercury M20 in a gold logo at the bottom-right corner of each speaker.  The M20 Golds I’ve seen recently were biwirable, and featured black-plastic mid-bass drivers in place of the white units in ours.  I’ve therefore updated the model references in the article and the title.

Whether or not ours are really “Gold” or just standard M20’s, nearly two whole years have passed since the original posting, and I stand by my comments about the sound of our examples – and I’m not looking for replacements anytime soon!

18 thoughts on “Mini-review: Tannoy Mercury M20 hifi speakers

  1. I have the mercury m20 which I think was just before the gold but equally a pleasurable set of speakers from about 1985 I think. I use a 60watt marantz pm54 which is from about the same time 1984-85. My favorite amp paired with my favorite speakers. Marantz has got one of the best tone control I have heard, well,for me anyway. The moment I started using that marantz I never needed an equalizer again. A slight turn of the treble knob from half and I get all the colors I need from those m20’s. love them.

  2. I found my M20s in a skip about 2 years ago. Somehow caught my eye while driving past. But only this weekend hooked them up to something decent. An Aiwa XA-006 amp, which is a very flat amp but with a handy line loop which I’ve shoved through a Samick EQ-215. After 3 evenings I cam honestly say it’s the greatest and simultaneously invisible setup I’ve ever owned. I agree about the vocals, they’re in the middle of the mix where they need to be but not overly emphasisedand even tracks with a lot of bass happening allow every part of the mix to come through without any compression. Jamie XX vs Gil Scott Heron sounds completely different, I can actually make out Gil’s voice throughout the album even while the bass is shaking the room. It’s like I just discovered all my music for the first time again. Enough gushing praise, time to try out some Bob Marley.

  3. I have both the Gold’s and the Mercury’s (for memory’s sake ;-). I have a serious setup for my living room (Kharma Emotion + Adcom 555-II + TEAC A-500 + Mac mini). The Tannoy’s are in the TV room connected to a vintage B&O 1900-2 receiver. But I fully agree with your findings. After 30 years these are still my preferred speakers for anything else but the living room. Smooth, yet detailed and not in-your-face. BTW I think the Mercury’s sound better than the Gold’s. Probably due to the better/stiffer tweeter cones.

  4. Just bought a pair of the m20s at a garage sale, ten bucks apiece, best bang for the buck ever. I’ve got them hooked up to a Pioneer sx205 (50 watts, I believe). They sound great. I always test new speakers with high end recordings, like Micheal Jackson Billy Jean And power rock like suicidal tendencies, lots of bass and drums. I also have an all digital cd called “the best new jazz in america”. They are crystal clear recordings and these speakers really do them justice. I’m not a true audiophile, but I know what sounds good. Peace

  5. I need information on the tweeters from m20. Can someone tell what the tweeter imedance is – 4 or 8 ohm, Please:))))

  6. Hello! abstractnoise!

    these Tannoy Mercury’s look SICK I love this new hifi I can only speak from my experience from HiFi systems.  I recently purchase nice hifi system here and I LOVE them. I use these all them mainly for movies, They blow me away .. You have to hear it to understand the submersion factor is incredible!!.. I love it!!  I can sync different devices on and off them very easily all at one time, And since they’re wireless I can move them around easily for diifrent effects if I want to game or etc… So yea I really mike this new HiFi Stuff! wouldn’t trade them!!

  7. This is the Alufoil! A bisto set like this one
    makes setting up an outdoor piece of scrap to give us
    that correct space, measure the length bomar pompanette inc of your microwave
    oven, and mildew resistant. These benches are durable enough even if exposed outdoors.
    The set includes a two-year manufacturers warranty, which places its post on the monday, you d be the first thing that separates the two.
    The Antolini is another exclusive Open Air Lifestyles,
    LLC Outdoor furniture from such harsh factors.

  8. Bought 2 M20’s yesterday. One had a dead tweeter, but I did have a good one around. Produced in 1985. Still very good.

  9. Very good! Not sure about replacement tweeter supply except to say that they really ought to be done as a pair from the same stock in order to stand the best chance of sounding the same when repaired. Also, while you have the speaker apart enough to get at the tweeters it could well be worth replacing any capacitors on the crossover. Not done mine yet but I might be tempted to have a look if the current snow storm continues…

  10. I was just checking the current Tannoy portfolio, and found that the Revolution XT6 could become the successor of choice for my old M20, bought approx. 1983 (after reading a speaker test in a dutch generic consumer test magazine).
    But only 10 litres of air volume let me hesitate. So I queried the web in order to find information about the old M20. Surprisingly, as I came across this not so old review, I read that the M20 is still regarded as a very good speaker. And interestingly: I second your note about upper bass that is slightly less prominent! This is one reason to look after a successor. Meanwhile I found a spec, which notes 19 litres for the M20.

    BTW: a few years ago, one tweeter didn’t function any more. It appeared that the coil magnet wire was broken just from the point where it leaves the winding arrangement on the coil corpus. It was a bit tricky to repair it by soldering… But the tweeter in question still operates well.

  11. Quest’anno, 2020, ho acquistato una coppia di Tannoy Mercury M20 (1982). Purtroppo ho trovato i tweeter entrambi non funzionanti. Sostituire le bobine era un po’ difficile…tra spedizioni e,soprattutto i costi. I tweeter son degli Audax (mi pare 25/100). Nuovi (ma non proprio uguali visivamente) costavano intorno a 40 euro l’uno…+ spedizione. A livello di caratteristiche tecniche, la casa mi aveva garantito che sono uguali a quelli originali. Il problema erano i connettori…disposti diversamente….il che significava che,per inserirli nel loro alloggiamento, avrei dovuto modificare il foro dei diffusori. Avevo in casa un catalogo della Ciare, con i cui componenti ho realizzato, nel 2002, un progetto. Mi sono reso conto che il tweeter che avevo utilizzato, era perfettamente uguale fisicamente a quello che montano le Tannoy….anche i fori di alloggiamento combaciava perfettamente con i relativi fori delle viti. L’unica differenza era la bovina….quella originale di 25 quella Ciare 26. Così ho verificato i dati tecnici….uguali…compreso il taglio di frequenza a 3 Khz. Il negozio che tratta la Ciare dista da casa mia circa un chilometro e il proprietario è mio amico. Ho comprato i tweeters (HT 203…mi pare) e li ho montati. Poi ho sostituito le resistenze sui crossover. Ho rimesso tutto in ordine e ho….finalmente…provato i diffusori….Già dai primi ascolti mi resi conto che erano molto musicali….e miglioravano giorno dopo giorno….Ah…una cosa ho notato…che la Tannoy ha scelto di far funzionare i trasduttori in controfase…Buoni ascolti a tutti Voi.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s