I think my aiwa has two blue sub-outs for left and right... pero nakakabit na sa speakers.
Hmmn, I'm not quite sure those are sub outs. They're probably just your regular speaker
high level or speaker level outputs.
Apparently, my aiwa component has built-in subwoofers. Should I remove them from the sub-out if I get new subwoofers?
I kinda doubt that. Most component system speakers would have
woofers, yes, to handle the mid/upper bass and some of the bass (50Hz to 160-200Hz). A dedicated
subwoofer is meant to exclusively handle the low-frequency sounds or the bass and some of the deep bass (as low as 20Hz to around 80-100Hz). While some audiophiles with money to spend will have
two subwoofers complimenting each one of their left/right main speakers, that's kind of overkill since bass frequencies aren't very directional hence the brain has a hard time localizing them hence even just one subwoofer will do.
An amp? Mahal yata yon? Meron bang mabibiling 2k na amp???
Meron siguro - second-hand, or surplus sa pier. BTW, by definition a component system has an
amplifier built-in so you already have an amp - just not a separate or dedicated amp like some people here.
If you do get a dedicated subwoofer you'll need to figure out how to connect it from your DVD player or component system. Most subwoofers, I think, have the option of being connected either through a dedicated sub-out connection or through
line-level outputs (low voltage outputs) or the speaker-level outputs I mentioned earlier.
If you're not sure how your DVD player or component can be connected to an external sub, then maybe you should ask your potential retailer/supplier to help you out. You may be able to describe your DVD player or component and they might know about it. Or, you could bring either to the store and they'll help you figure it out there.
You could also take pictures of the back of the units and post them here so the other members can help you sort it all out. Alternatively, ask a friend who's more experienced and knowledgeable in these things for help/advice in setting up.
Or, mukhang dito sa PinoyDVD maraming willing na samahan at tulungan ka.
Good luck!