Yeah lor, can consider going to Penang lah, that shop is my friend's shop, he can give you a special price, just find that guy lor. After all, Perak to Penang is not that far also.

Well, Bro yrh0413 is right to say that it's pointless to use two subs because if you're getting a better sub, why bother using the weaker one and if you're getting Logitech Z-2300, a complete 2.1 system, I don't think you really need to keep your CS21 anymore. For my system, it's different, my Yamaha A/V amp supports two subwoofers (must be of the same brand and model of course) but for your setup, I think, you gotta decide whether you wanna keep your CS21 and find a better sub or replace the whole system. There's a 2.1 speaker which is quite good but pricey, it's called Aego M if I'm not mistaken, that's rated five stars by What Hi-Fi UK for this year, I think some members are selling it here, should be around RM780 if I'm not mistaken, it's by AE, very famous loudspeaker company in the UK.

Well, there's only choice left Logitech Z-2300, the bass is boomy and loud, it should suite Bro Narkon's musical taste but I still like Aego M, it's not bass shy but it's very accurate sound pair of speakers, just love it but of course, I still love my AL MX5021 lah.

Well, my old junk AL ADA305 also sounded better than some of the precier AL models too because the subwoofer is made from solid wood, it might be underpowered but the sound is more superior and the total weight of the speakers are indeed heavier than most of the last AL speakers. Cost cutting measure I guess.

If your vs4121 is under warranty, do not attempt to open it. Not worth voiding the warranty just to take a peep inside, you know what I mean?

I guess seeing the actual thingy with his own eyes will be a real eye opener than looking at the pictures uploaded here.

Where did you source for the materials, looked kinda like good quality to me.