5 replies to this topic

[DD]

is 30 hz fine for sq .. getting about 1 kw.... but i want it to get really loud .. or can i port it to 40 hz to get it that bit louder .. so what im asking is ...
is there a big differnce from
30 hz to 40 hz in SQ

[Mickee]

I generally believe you should tune your enclosure to get the flattest response from your sub possible, as well as going as deep as possible.

If you tune your enclosure to a higher frequency you usually get a peak in the subs response above the tuning frequency (note: this depends on the sub's characteristics). For example, if you tune your sub to 40Hz, you may get a peak at around 50 or 60Hz, this will cause you to hear "one-note bass", that is, all the bass notes from the sub sound the same pitch...

Basically its a trade-off. Higher tuning frequency will probably be louder, but may give a nasty peak... compared to lower tuning which may be quieter but probably give a better behaved roll-off...

IMO, for SQ i'd go the lower option

BTW, yes, there is a big difference between 40HZ and 30Hz, and the response of each sub is different, that is, you need to find out what tuning suits your particular sub best....

[ November 11, 2003, 22:11: Message edited by: Mickee ]

[DD]

so ... for music .. will it be louder to the ear at 30 hz .. or louder at 40 hz ?

[Mickee]

depending on your particular sub, it will likely be louder if you tune to 40Hz, but it will be DEEPER if you tune to 30Hz...

For SQ, deeper is better. Most SQ systems generally aren't tuned to simply play as loud as possible...

[rolli]

find out what the Fs is of you sub, and tune it to that (mid to high 20's), this will typically give you the flattest possible responce, and with 1kW of power, going loud is not an issue!

And remember, never go below you tuned frequence, or your sub will 'unload' = bye bye sub hello smoke...

[Sonic Nirvana]

For SQ, normally you expect to tune at or just above Fs, depends on the driver, but that's a good guide.

Plenty of port throat area to keep chuffing away, means a long port at low frequency tuning.

And yes, use a steep subsonic filter imeediately below tuning freq.