This is an extract from another thread.. Just starting a new thread, in case some one is interested
Long time back, when I just got into HiFi, I read some where that 'if something is recorded onto the song, then it needs to be reproduced to get the correct intended joy of that song'.
So when it comes to the low frequency, most of the respectable floor standers can not dig as low as +- 3db at 21Hz or +-6 db at 18Hz. That makes a subwoofer must (unlike movie watching where eyes & ears get engaged, music listening can pick up the additional low end weight).
As you might be aware that the biggest thing that works against a three way speaker in comparision to a two way speaker is the transition at the cut off frequency. With a three way there is a possibility of two dips and with two way just one.
When we translate this to a subwoofer which is mounted in a seperate enclosure, driven by a seperate amplifier, completely different most probably too different drivers from the main speakers and with much more plausible standing waves effected by the room acoustics etc etc - many people do not bother to integrate a sub into the music system and happy to invest much more on speakers which can dig few more hz below.
Let this not put off any one but only work as a guide to do the job right and that's where the PV1 comes in. It's pressure vessel construction makes bass very tight (extreme opposite of diffused) and also placement relatively easily. It can take the speaker level input as well which makes it easier for stereo set up (but I do with RCA). If the main speakers have bungs put them in and set the dial on sub 5-10hz more than the cut off frequency of the main speakers (mine is set at 60Hz). The tricky part is setting up the volume on the sub. Though initially I used to bring down the volume decrementally, I have figured out that bringing up the volume is better. Also I got carried away to set the volume on sub so that I can hear the sub but the trick is to set it in such a way that you set the maximum volume where you are unable to hear the sub seperately (I agree, it takes some trial and error).
That is it. Once set up, you listen for a day with the sub on and the same tracks again with sub off and the sub goes never off! (In my case, I turn the sub off after 21.00 just to be nice to my neighbours though they never complained!)