Electricity?

Ok, I'm just wondering if the 300w on the converter is a peak value and hence the RMS might be ~200 which might not be enough. That is unlikely though.

When you say no bass, what exactly do you mean? No sound at all through the sub, or no low frequency components in the sound?
 
Thanks for your reply. No, no sound at all.

It has stereo phono inputs (red & white) but I only have a mono output on the back of my Yamaha AV amp, so just running an SPDIF into the back of the sub. Tried both red & white.

I have a 3.5mm to stereo phono cable so I plugged it into my MP3 player, then into the sub inputs, still no sound at all....so it must be some kind of power issue?

I have two of these subs, both exactly the same problem! So I know it's not the sub, and the MP3 test confirms it's not the amp or SPDIF cable.
 
have you checked the fuse in the sub (if there is one) and in the transformer? Do any lights come on when everything's switched on? Apologies for the obvious questions!
 
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Don't confuse the amplifiers power output with its power consumption, they're too completely different things. The sub you linked to has a class D style amplifier, is should be very efficient and therefore unlikely to draw more power than your step down device can produce, even when running at higher levels. At idle and low levels it should be negligable. The fact the LED is on and there's no burning smell :D would suggest to me the problem probably lies elsewhere.

You mention SPDIF connection but I'm not sure you meant it, that's a digital connection and not an analogue one which is what the sub needs (ignore the fact they call a class D a 'digital' amplifier). However your trick of trying the MP3 player is exactly what I would have suggested next and I'm really puzzled that you didn't get something out of it.

You say the power light is on, is it red for standby or green for operate (it should sense a signal automaticaly)?

Have you tried connecting the speaker level connections to your amplifier to see if that works?

If that doesn't get some noise I'd start to suspect a faulty unit/s.
 
Empire said:
Don't confuse the amplifiers power output with its power consumption, they're too completely different things. The sub you linked to has a class D style amplifier, is should be very efficient and therefore unlikely to draw more power than your step down device can produce, even when running at higher levels. At idle and low levels it should be negligable. The fact the LED is on and there's no burning smell :D would suggest to me the problem probably lies elsewhere.
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indeed, the only other thing i can think of is perhaps the sub is draing a high current at switch on, which it shouldnt but...you never know. perhaps its enough to trip the convertor, i dont really know
 
If the convertor had tripped I'd expect the subs light to go out eventually. I suppose it's possible that the convertor isn't outputting the right voltage (would be worth measuring it under load, but only if you feel safe doing it) and that is causing a protection mode on the sub woofer. Might be worth talking to the manufacturers technical support team to see if they think this is a possibility?
 
Thanks all!

Well, when the sub first comes on, it shows a red light. If I switch the power on/off quickly (once) it goes to green.
Throughout, the transformer shows it's orange light, so not tripping out.

Today I tried a new transformer, this time a 300W one, it didn't make any difference.

The cable is a 10m Digital Coaxial Cable SPDIF Audio Lead.

It runs from the single, subwoofer out on the amp. The sub has black & white connectors, I've tried putting it in both, and the MP3 player test was 3.5m to red& white anyway, no signal.

Tearing my hair out now!
 
Wierd! I really don't understand this. It is doesn't come out of standby when you feed an input in then that doesn't sound hopeful.

Have you tried connecting the speaker leads to the relevant terminals? I'm curious to know if this wakes it up and gives you some output.
 
Hooked up the speaker inputs to a old amp I have, jacked it up full volume, nothing on either sub.

...they must, both be dead. Just a coincidence I guess! Thanks for your suggestions :)
 
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