Help - subwoofer keeps going off.....

Discussion in 'Subwoofers' started by iainsim, Nov 8, 2001.

  1. iainsim

    iainsim
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    Just bought a Denon AV-F100 with the Mission made SCAV-100 surround speakers.

    Unless the volume is loud, the subwoofer doesnt work until I turn the volume right up

    Followed the cabling instructions to the letter but is there a way around this problem?

    Anyone have any suggestions? Ive tried altering pretty much all of the system settings.
     
  2. slingshot

    slingshot
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    Could you give us some more details such as :-

    Are you using the high level (speaker) connections or low level phono ?

    When you say it goes off do you mean the power switches off ?

    What amp settings are you trying to use i.e. small/large speakers and bass out to main or both.

    What sources are you trying it with i.e. DVD DD5.1 or TV signal which is pro logic ?

    What have you set the roll off point on the sub woofer too ?

    I assume you realise on DD the use of the sub channel will not be continuous, but only at certain points ?

    Anyway let us have more info and we'll try and help.

    Cheers

    Slingshot
     
  3. General Skanky

    General Skanky
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    Is there a subwoofer volume setting buried in the menus at all?
     
  4. iainsim

    iainsim
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    The speakers are NXT small ones which irrespective of the system settings I use sound tinny without the SW. They are all plugged into the SW, which has a single large cable which breaks into all the necessary cable ends to plug into the back of the Denon (not phono plugs)

    The SW cable, however, only has a phono plug for the SW itself and there is no speaker connection availavle other than that on the Denon or the SW that isnt taken up with the other speakers.

    I've tried every system setting in the whole of the manual, small spakers, large, increasing the SW volume, changing the surround settings, etc.

    If I turn the volume up, particularly on music, the SW plays continuously or plays when it obviously should, sounds good.

    If I turn the volume down to a level that wont cause the neighbours to phone the police it continues to put out the low frequencies, but then after about 10 secs or so, the green power light on the back goes red and the bass just dies till I crank up the volume again, or switch it off and on again. Same with DVD films.

    OK, youve got me on the "roll off point". I'm (as you can probably tell) a novice to this, what is it and how do I set it? Thanks for your help, I'm close to picking a window for it!!
     
  5. slingshot

    slingshot
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    I don't know anything about your speakers unfortunatley, from what you say I assume they work at speaker level only i.e. you plug the large cable from the speakers into the Left & Right speaker connectors on the amp.

    It sounds like they may have some sort of power saving device that switches the sub off when there's no signal, i'd guess if you turn the volume back up the sub get's a signal and switches on again.

    Sorry but other than take it back to the dealer I have no idea's on this one, maybe someone else on the board know's these speakers.

    I don't think the roll off setting is relevant to these speakers, because the sub is matched to the stereo speakers, but basically it's just the frequency that the sub will stop producing sound.
     
  6. dUnKle

    dUnKle
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    Feeling unwell at moment so if I say reapeat something then im sorry.

    First things first, you have your sub connected from your amp using a phono cable type lead. Have you made sure that....

    <1> The cable is connected to the SUB OUT socket on the back of your amp, this sometimes does not have anything written next to it but is more often than not next to the pre-out for a center speaker.

    <2> Is the phono cable going into the correct input socket on the sub ? Some subs have a left and a right input, one of these will be marked "mono" and this is the one you should use.


    Now turn up the volume on the subwoofer AND the roll off to MAXIMUM. When connected with a phono cable you are feeding the sub with the .1 part of the soundtrack and by setting the roll off to max you let the amp handle all the bass properties. Now run the subwoofer TEST TONE from the amp. What do you hear when doing this ? If you hear something you are onto a winner, if not increase the volume of the subwoofers channel level ( may show a figure between -12 to +12dbs ) until you do. If you dont hear anything then you will find you have a reason to return your sub as faulty.

    Some subs do have a power saving mode which allows the sub to switch off when it has not detected any sound but this is usually around 30mins or so.

    A couple of other things are.

    <1> Are you listening to soundtracks that have a dedicated bass channel ? 5.1 material as a dedicated bass channel, whilst pro-logic and stereo sound does not.

    <2> Set your speakers to small. From how you describe them they are not designed to handle bass. In small mode your amp should send the bass for all the speakers to the subwoofer, and so in stereo and prologic mode you should get bass sounds.
     
  7. dUnKle

    dUnKle
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    just out of interest have you solved the problem ?
     
  8. Stuart Wright

    Stuart Wright
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    Iainsim, have you read the reviews of the system over on all 3 AV sites here (HCC, What Video and Total DVD)?
    The reviews might help.
    It looks like the main L+R are powered by the pre-amp unit and the centre and surrounds are powered by the bottom power amplifier. The subwoofer should be fed from the SW pre-out on the pre-amp unit.
    It sounds like you are powering them from the subwoofer, and I'm not sure this is the right way to do it. Although this is an option with this speaker package, have you tried plugging the speakers into the Denon pre and power amp?
    It may be that you are connecting the whole speaker package up via the SW cable only - which means you'll only be getting LFE through your speaker system !!! Please don't tell me this is how you've done it ?!
     
  9. iainsim

    iainsim
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    I did at first, but over the week Ive had the system, I've tried every possible combination. I went to a local hi-fi specialist who told me to try exactly what youve suggested and the problem still happened with the sub. When the sub is on and working, it sounds OK but not great, but it comes on and goes off randomly. I tried to watch Gladiator as well, and in one of the main arena scenes, where there's definite low frequency sounds in need of some support, the sub still goes on and off at random moments and all you get is the nice, tinny sound of the other speakers. I couldn't understand why it would make a difference anyway, if the sub has a built-in amp itself (but no doubt it does)

    Went to listen to a set of Kef eggs attached to the Denon AV-F100 at the weekend and the sound quality is massively better at low and high volume and there was no problem with a tempremental sub.

    I am going to change them anyway, this is my second set, the first that were delivered, the sub and the centre speaker were damaged so I'm not convinced about the build quality either. I'd rather pay £200-£300 more and get something I'm happy with.

    Thanks for your help anyway, its been extremely useful.
     
  10. Stuart Wright

    Stuart Wright
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    I think you're making the right decision about the speaker system considering your complaint that the speakers are 'tinny'. These NXT speakers don't have much in the way of bass extension so the subwoofer may be set to produce higher frequencies than a decent system should.
    Personally I think systems like this one make a big compromise on power and quality in order to achieve compactness.
    Separate av amp & DVD player combis may cost a little more but produce much more oomph.
    Also don't script on the subwoofer. I personally would make a compromise on speakers (though maybe not as much as the NXTs!) and get a good subwoofer. A good sub enhances a system with mediochre speakers. You can upgrade your speakers later.
     
  11. iainsim

    iainsim
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    I'd have gone for separates, but for space constraints and trendy furniature bought by my other half that wont fit separates and barely fit the Denon!!

    Everyone seems to think a lot about the Kef's, whats your opinion, and is the Kef sub that comes with them good enough?

    Otherwise, if you can recommend a good set of 4 bookshelf speakers, a centre and a good sub that comes in at around £6 - £800 I'd be happy to go out and listen to them.
     
  12. Stuart Wright

    Stuart Wright
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    There's a guy advertising used REL Q200es for £380 in the classifieds. I'd offer him £350 (although I would pay £380) and get whatever speakers you can for £450. You should be able to get something pretty good. Mission 72 or 74 for example (use the hifibitz link on the left so we get commission, mind :))
     

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