The CAT6 sat on the mat…

One damped network switch coming right up!

As an inveterate fiddler, and a long-term believer that almost anything you do to a hi-fi system – any hi-fi system – makes some difference, I’ve just damped my network switch. Yes, I know that sounds like I may have got over-excited, and had an accident of the kind that be a bit dangerous with mains-powered equipment, so maybe I should explain.

I recently bought myself one of those network switches much raved about by those seemingly in the know on various forums, though I must admit I did so more out of cynicism than intrigue.

After all, there was me thinking I’d already optimised my network connections some time back with the addition of fibre-optic ‘wiring’ in place of the more commonly-used CAT5/6 Ethernet.

Cisco eight-port switch – the fibre converter goes into the little square socket to the right…

A short mooch on Ebay found me the ‘approved’ switch – a used (and now discontinued) Cisco Catalyst 3560 eight-port model – plus the little 10GTek dongle to plug into it to link to my fibre music connection, thus allowing me to eliminate one of my converter boxes (and more to the point, another potentially noisy power supply). I also needed a change of fibre cable to convert from my fibre converter’s SC connectors to the LC ports on the GTek – about £10 or so.

And here’s the plug-in
fibre converter itself

It all arrived, and sat in its box in the hall over the Christmas/New Year period while I thought ‘I must try that out’ every time I passed it. I finally got round to installing it on one of those dead January days when something doesn’t happen or fails to turn up, and you find yourself at a loose end.

Meanwhile, conversations with a couple of friends who’ve also been trying the same kind of switch suggested it might benefit from some damping.

Yes, I know… But anyway, I looked into it, and found a suitable material: Dead Mat Hex from British company Dodomat, designed for damping and sound insulation on the panels of vans and cars. Just a millimetre or two thick, and self-adhesive, it looked ideal – and while the company usually sells the stuff via its own website in rolls or jumbo packs big enough to do an entire vehicle, on its Ebay shop you can buy individual sheets, around 12in/30cm square.

A stack of Dead Mat Hex – individual sheets are just £2.50 delivered on Ebay

Just the job, and even better only £2.50 delivered, leading me to wonder how anyone can sell something on Ebay for so little complete with free 48 hour postage, and still make money.

It was slim enough to fit inside the lid without touching or fouling anything, is said to be good for temperatures up 120C – and anyway, all the cooling of the Cisco is achieved via perforated side-panels and amp-worthy heatsinking on the rear. Well, small amp-worthy.

So, lid off, hold it up by one corner, and rap with knuckles. Clanggg! Cut sheet to size – I only used half of the piece I bought – and stick it in place inside the lid. Then tap again and… Clunk.

The lid of the Cisco lined with dead shiny Dead Mat

Interesting… I mean I’m not for a moment I’m now getting just a clunk transmitted down my network cables where once there was a clang – that would be silly – but rather that damping out any vibration in a piece of electronic equipment can’t help but be good, right?

So, with the lid back on the switch – the use of which (in place of my old Netgear) I’m convinced had already made the sound just a little more focused and clean – and everything re-plugged, I’ve been doing a spot of listening.

And? Well, let’s just say that so far it doesn’t sound any worse, and I’m sort of sure I think I’m maybe sometimes hearing just a little more space in the sound, and slightly better soundstage imaging.

Course, could be wrong, and I’ll spend a lot more time listening to favourite tracks and deciding whether there’s some kind of improvement. But then that’s all part of the fun – and it’ll only have cost me £2.50 to find out.

Only trouble is, I’ve now got half a sheet of Dead Mat left, and am eyeing everything else in the system, and wondering where it might work…

(No cats – or indeed network cables – actually sat on any mats during the making of this blog)



  1. Nick Spindler · · Reply

    Great to see your blogs again, Andrew. Not sure how you find the time with all the reviews in HFN and editing Gramophone Audio pages.

    1. As I said at the start of this blog, you can tell when I am busy as postings here dry up! Glad you’re enjoying, and will try to post more here this year.

  2. I can’t comment on the Dead Mat, Andrew, but I approve of your choice of SFPs as a way of running fibre. I noticed your previous article about ‘Added Fibre’ useng SFPs, but I didn’t try it as I wanted more of a whole house networking solution. After doing this with POF for a while, I ditched it in favour of 3 Catalyst switches, linked by multimode fibre with SFPs. This eliminated several FMCs and wall warts, as the Cisco switch conveniently becomes an FMC. This has given me a rock solid network which has now been running well for a year or so.

  3. Martin D’Arcy · · Reply

    Hello Andrew,
    Thank you so much for this. I’ve just today got a Cisco Catalyst 3560 for £21 inc p&p and a TP-Link MC200CM for £17 inc p&p. Can you tell me what model the 10GTek transceiver is please. I don’t know if I need a specific one. Also just upgraded to Hegel H190 from H90; goes great with my ATC SCM40s
    Martin D’Arcy

  4. Martin D’Arcy · · Reply

    Hello again,
    I’ve got the CISCO, the TP-Link switch and there’s the problem – the connectors are incompatible! Did you have to change your fibre optic cable to LC/LC to SC/SC? Would have been helpful to have mentioned it, or is there another way? I’m a complete novice at this.

    1. Apologies: yes, a change of cable was required. Have updated the post accordingly.

      1. parishlantern · ·

        Hi Andrew,
        Sorry if I sounded annoyed – frustrated is more appropriate – new cable will arrive tomorrow – so looking forward to having fun (hopefully).
        Best wishes and Merry Christmas

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