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In Reply to: RE: Should a sub be adjusted constantly? posted by jimbill on July 26, 2007 at 16:18:57
The answer depends somewhat on the sub and connection methods.
If you have a REL, you can have it connected both with high level (speaker) connections and low level (interconnect) connections and there are separate gain and phase settings for both inputs though the crossover setting remains the same. If you use one connection for music and the other for HT, you need to set both but then you just swap between the 2 settings via the phase setting.
If you've only got one connection, the setting should be the same for both but a lot depends on your AV receiver if you're using one. The LFE channel on soundtracks requires a 10 dB boost and the receiver should supply this automatically when decoding the sound track. If it does, then there's no need to change anything. If it doesn't, then bass is going to be fairly light with soundtracks unless you supply the missing 10 dB of gain somehow. Ideally you should be able to do this at the receiver and not touch the sub's own settings. Just balance it for music and then, when you're happy with that, add the extra gain for movies via the receiver's channel balance or its sub settings if it has control over that.
Finally, the other problem that can arise is if you like a different bass balance for movies to what you like for music. In that case you're going to want to set things differently for each. My preference would be to do it at the receiver rather than the sub if possible.
If you're using an amp rather than a receiver and don't have channel balance controls, then you're going to have to change things at the sub if you need to change the settings.
David Aiken
Follow Ups:
I use an older Luxman preamp, so no AV features. So you're saying that I could just bump up the bass setting on it when watching movies with LFE, leaving the gain setting on the sub alone? I currently have everything on the preamp set to neutral. Neutral being at 12:00, +10db would be about 1:00?
This would be much easier than getting to the back of the sub. It's taken me awhile to get it zeroed in for music so I hate to mess with it.
No receiver.
So, are you taking 2 channel audio out from the DVD player and inputting that at the pre-amp? If you are, the player should take care of the 10 dB gain for the LFE channel when it mixes things for 2 channel output. Just ensure that the player is set for 2 channel output in its setup menus and make sure you're using the dedicated 2 channel outputs rather than the L & R outputs of the 5.1 channel outputs and you should be right about the LFE gain issue.
If you're doing something other than simply taking a 2 channel audio signal from the DVD player, ie you're taking more channels out and sending some of them to something other than the pre-amp, then we need more info before anyone can give you any advice.
You talk about 'bumping the bass setting on the pre-amp'. If you mean boosting the bass tone control, then I wouldn't recommend that. Tone controls start to operate from a frequency well above the sub crossover frequency, sometimes as high as 1000 Hz. You're going to have an effect into the upper bass region, and probably even well into the midrange, if you use the tone control to boost bass. It will certainly boost what the sub is producing, but it's also going to boost what the main speakers are producing too. If you just want to boost the extreme low bass, then you really only have the option of playing with the sub's gain unless you're prepared to spend money and either replace the Luxman pre-amp with a HT pre-processor, swap your pre and power amps for a receiver, or (much cheaper) get a device like one of the Behringer products designed to provide bass equalisation and use it to provide the boost.
You should really only need to do that if your taste is for more bass in movies than in music. Otherwise one setting should really do it for both. Perhaps the simplest solution is simply to set the sub where you're happy with it when you're playing music and just leave it there. Over a couple of weeks you should adjust to that particular sound with movies and once the aural adjustment is made, any concerns about bass levels may vanish apart from the occasional movie where it seems as if the overall mix is a little bass shy, something that seems to be rarer these days.
David Aiken
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