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Re: my sub keeps popping when working?
If this happens on high levels, popping from your subs generally relates to the cone being over exerted and reaching the physical limits of the cone travel, or the amp is approaching its limits resulting in clipping and producing square wave peaks on transients This sort of problem can generally be tuned out of a system by careful adjustment of EQ and drive levels.
If the system has been working fine to date, and this is a new problem that has just started, then you may have a failing sub.
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You have a lot of choices for this. First, unless you are tuning the sub to a specific frequency you have options. You didn't specify the size of sub so it's difficult to say specifically, but if it's a 12 inch sub, you need about 1.5 to 2 cubic feet. Of course the performance of the sub depends on the music you listen to. If you listen to rock, pop, classical, or country, I recommend a sealed box. A sealed box gives you better control over your sub. The air acts as a cusion and decreases the return time of the cone to rest position. This gives you tighter bass. If you listen to rap or hip hop, I recommend a ported enclosure. This type of enclosure allows for more cone excursion, thus allowing the sub to recreate lower frequencies. Hope this helps.
I can't find that message in the manual but I would guess it's trying to tell you something is wrong going out to the subwoofer. Trace the wiring. If you don't see anything wrong, disconnect the sub and see if the message disappears or changes.
What do you mean that it sometimes doesn't work? It doesn't power on automatically? Check settings of your receiver - if it has subwoofer output enables and if low frequencies from all channels are directed also to the SUB. By default only the LFE channel (.1) of 5.1 signal input is fed to the subwoofer. So Sub will work in this case only when you listen to 5.1 signal (DVD movie for example), but for radio or stereo music, only front speakers are used. By configuring this bass redirect, you can use subwoofer for all signal types.
Set front speakers for small and make sure sub is turned on in setup mode. If Front speakers are sent to large I believe the only time sub will work is with Dolby Digital Lfe signals. If sub is turned off of course it will never work.