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Old 19-01-2010, 12:35
GetFrodo
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As I only have one subwoofer and one amp, does anyone have any bright ideas to test where the problem lies? I have already swapped the cable.

I hope it's the subwoofer but suspect it's the amp

ps I have played with all the amp settings so am sure that it should be outputting on the lfe, and it used to work...

pps and the subwoofer's power lights still come on, so no visible problem (although it has had a small plastic bag 'posted' into its innards by my niece )

ppss I noticed the problem after replacing the front and centre speakers
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Old 19-01-2010, 12:42
gomezz
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It may help if you actually say what make and model of amp and speakers they are.

Does the amp know that there is a subwoofer connected it is supposed to use? On my Denon amp, for example, I have to set surround speakers to Small for it know that.

Have you tried connecting any old radio or stereo direct to the subwoofer?
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Old 19-01-2010, 12:54
GetFrodo
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I don't have anything else with a subwoofer output.

It was more of a generic question of how to test the lfe output of an amp or the operation of a subwoofer without getting hold of a different amp or subwoofer.

Dunno what make the subwoofer is, but the amp is yamaha. I have now selected front and centre speakers to be large, but still have the option for bass to be from 'main', 'subwoofer' or 'both'. With either of the latter two options there is no output from the subwoofer, obviously not from the first option either.

Like I said, it was all working before I started playing with it and adding new speakers...
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Old 19-01-2010, 12:56
Nigel Goodwin
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If it's a passive sub-woofer, then simply connect it to any speaker output and see if it works.
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Old 19-01-2010, 13:16
gomezz
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Even if it is an active subwoofer connecting to the phono/aux out of a CD/radio player (or to the heaphone output with the volume turned way down low) will do.
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Old 19-01-2010, 13:18
GetFrodo
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It's active. Would hooking it up to a normal phono output (i.e. full frequency range) cause any problems?
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Old 19-01-2010, 13:19
gomezz
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No. The subwoofer will have a frequency filter built in to only allow the low frequencies through.

Have you tried using a different lead? Or even checked that the existing lead is fully inserted in the right connector on the amp as you may have disturbed it when changing the surround speakers?
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Old 19-01-2010, 13:28
GetFrodo
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Yeah I've checked/swapped out the cable. I'll try using a different phono output to see if I can hear anything.

Thanks!
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Old 19-01-2010, 15:55
Deacon1972
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Things you can check........


......the volume hasn't been turned down to minimum on the sub.

......the Xover hasn't been turned down to it's minimum, this should be set to max.

......you are connected to the sub input on the amp.


Speakers should be set to small with the amps Xover set to 80Hz.

Once all connections/settings have been checked run the test tone, this should tell you if the sub is working or not.

NOTE - Depending on the model/make of your Yamaha the sub may not become active during the test tone, I remember some Yamaha amps I have owned in the past only triggered the L/R/C/SL/SR speakers, if this is the case just play a bass heavy soundtrack.
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