Making your own crossover might be difficult. You can buy them, but dunno if they are cheap. The easiest route would be to buy a sub with a high-level filter. You plug your speaker cables into the sub ...

Considering its audiophile products – like the D215s THX Dominus subwoofer – can set you back $10K or more, the new A-Series range is "entry-level" in comparison. It starts at $995 per speaker and ...