Soldato
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Should have bought two powersound subs, four X 18" drivers in each box. 4000w per sub
Spec me a subwoofer to go with tannoy eclipse 5.0
- Thread starter Buffman
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Why would he do that ?
Soldato
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To destroy his house of course 
Thanks for your help!
Is it recommended to up the gain on the subwoofer or best to do this via the amp?
I could reset it up with the microphone but figure this won't do much for the sub?
Soldato
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You want the subwoofer output on the avr to be close to 0 is not +12db or -12db
Thanks. May I ask why?
Assume subwoofer amplifies sound better/less interference?
Soldato
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To do with clipping signal not overdriving output stages or something like that
Soldato
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The xls 400 is a actually quite a small sub. It's only 12" and sealed box. Look for 18" ported down to 15hz and it'll be as big as fridge freezer
Caporegime
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does your amp not have a mic to auto set everything up for you?
i let my AVR do it all for me. then i cranked the gain up a tiny bit on the sub after it had been calibrated as i like a bit of extra bass.
i also have the xxls400. i can check my dials next time i'm near the sub. it's a beast of a sub. i want to try their monolith as a ported unit gives more impact than the sealed xxls400. however the xxls400 is better for a mix of music and movies and i play a lot of music in that room.
This sort of stuff is generally detailed in the set-up instructions for your amp/AV receiver; however, to save time, the general approach is to the sub's crossover frequency to max and the sub's volume control to 50%. You then let the amp do it's mic measurements.
If you find that the dB figures for the sub from the amp's onscreen menu show it set excessively high or excessively low then you might want to tweak the sub volume to compensate before rerunning the set-up wizard. Something in the range +3dB to -3dB is about what you're aiming for.
The BK subs are well engineered, so the sub's amp will run with the volume set at max if it has to. However, in order for the AV receiver set-up wizard to balance the levels of each speaker it has a limited amount of adjustment range. Often it is +12dB to -12dB, which is plenty in most cases, but it might not be enough if the sub's volume is whacked up to max.
There are a couple of other reasons why you might want the sub's volume level at a more neutral position. The first is cable hum in the form of signal to noise ratio. All cables pick up noise. Some cables are better at dealing with it than others, so they have a lower noise floor which means a better signal to noise ratio (SNR). Since the sub uses the SNR as a way to auto detect a signal, then when the SNR is small then the sub will have a harder time sensing when it has to switch on. With the sub's amp set to max, the AV receiver will have to send a much lower signal level to compensate. This makes the SNR worse.
Another consequence of having the sub amp at max is that you might hear a bit more hiss or hum . This is because any noise picked up by the cable is amplified a lot.
Setting the sub volume to a more sensible level gives you more signal down the cable and, we hope, a bit more range left in your AV Receiver's subwoofer setting.
If you find that the dB figures for the sub from the amp's onscreen menu show it set excessively high or excessively low then you might want to tweak the sub volume to compensate before rerunning the set-up wizard. Something in the range +3dB to -3dB is about what you're aiming for.
The BK subs are well engineered, so the sub's amp will run with the volume set at max if it has to. However, in order for the AV receiver set-up wizard to balance the levels of each speaker it has a limited amount of adjustment range. Often it is +12dB to -12dB, which is plenty in most cases, but it might not be enough if the sub's volume is whacked up to max.
There are a couple of other reasons why you might want the sub's volume level at a more neutral position. The first is cable hum in the form of signal to noise ratio. All cables pick up noise. Some cables are better at dealing with it than others, so they have a lower noise floor which means a better signal to noise ratio (SNR). Since the sub uses the SNR as a way to auto detect a signal, then when the SNR is small then the sub will have a harder time sensing when it has to switch on. With the sub's amp set to max, the AV receiver will have to send a much lower signal level to compensate. This makes the SNR worse.
Another consequence of having the sub amp at max is that you might hear a bit more hiss or hum . This is because any noise picked up by the cable is amplified a lot.
Setting the sub volume to a more sensible level gives you more signal down the cable and, we hope, a bit more range left in your AV Receiver's subwoofer setting.