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Message: <blockquote data-quote="Kippo" data-source="post: 1140911" data-attributes="member: 10096">seems that some of you are not clear on the items that affects the sub.1. Amp. output power: It has no bearing on the frequency response of the sub. A sub that move 5mm with 200W & move 10mm with 600W will have the same freq. response. The difference is only the loudness of the sub. So if you have a problem with how not loud your sub is, go for more power that the sub allows. If you change the sub then the freq. response will differ. You cannot make a direct comparison la.2. Box design : ported/vented, sealed, bandpass (4th./6th./many2 order), hybrid design etc. will affect how the sub will sound. If you do not like how your sub souds then go re-design your box. Which response you want? More on upper end (80~150hz) or lower end (30~50hz)? This will affect how you design your box.If you like *thump*thump* kind of bass then you need to go for higher Qtc (>1) for sealed box or port tuning higher eg.50hz for ported/vented box. If you like more low end extension i.e rumbling bass (your car vibrates but you don't feel anything) then go for lower Qtc (0.85>) for sealed box or port tuning at eg.30hz for ported box.So what you like? it will depend on your music taste. Rock & techno (kampai kind of style) will be more on upper end. If you like hip-hop, trance, classical etc. then go for lower end.A good way to see if you like a particular sub response, go build a ported box but with the round port installed outside the box. Then vary the port tuning by shortening or extending the port length. I recommend to use PVC pipe (3" or 4" so minimise port noise). Once you like the sub response, (this for experience user only) go and measure the port lenght and calculate the port tuning. Use simulation software eg. WinISD or LEAP (if u're rich) and plot the freq. response graph by putting in the net box vol., port length&diameter (port tuning). Now if you want to use sealed box then plot a sealed box response curve and vary the box volume until you get almost similar curve as the response that you like. That will be your base for more fine tuning.i'll stop here.</blockquote>

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