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Yes, I know they add those low-frequency noises now. Gives you a rumble. That's the reason I'm not advocating tuning boxes for relatively small speakers to an extremely low non-audio frequency. Indeed you may need a plate amp then, like you suggested, that has a 20Hz-down filter in place, and...

Robert, Well, then I have to disagree with you of course. [/url] Optimum is what meets the designer's goals for the sub. OK, but in my book the designer is part of the process. If the designer's goals are lousy, the box meeting those goals is lousy. But I agree that "optimum" is subjective. My...

OK, yours is the LW89X, I assume? Also, I'll assume you only need one speaker in your box. Using the second speaker as well, would give you twice the possible max power (+ 3 dB), but you'd also need two amplifiers in stead of one - and a bigger box. That's because if you want to use both, it's...

We need some additional info if you're not going to design it yourself! Cees

David, That weren't your links I was referring to! No need to apologize, therefore. Cees

Robert, The T/S parameters of David's woofer are in the above mentioned manual. No need to get them mailed. Cees PS: I edited your link out. It's against our rules (link in my signature) to promote commercial websites and you've done it enough now. C.

David, "Thiele/Small parameters" may sound like impressive nerdish bullshit, but they really are information about the weight of the cone of that driver, its stiffness, the strength of the magnet and how much it moves. That info is necessary to design a proper box. The box has to counteract...