Because high SPLs at low frequencies require shifting a lot of air.
With a small sub, you run up against the limits of how far the driver can physically move (regardless of power) at very low frequencies, long before you reach the same limit higher up the frequency range, so the louder the volume goes the less deep notes it produces comparatively.
You can take steps to give the sub a hand by corner loading it for maximum boundary gain (stick it where the bin is), but at the end of the day, physics win.
Thanks guys,, so basically live with it or get a bigger sub... I think I will have to live with it, cos Ive only had the sub for about 3months.. But im guessing if I get a bigger sub, I will have the same prob again when I upgrade my speakers,, so you cant really win can you, unless you go stupid and buy speakers and sub both together, but then thats mega money
On a curious note,,,,,Just how powerful would my sub have to be to keep up with my 5x50watt speakers, bare in mine I use all 5 speakers for music.
Im gutted my sub is lacking in power when my speakers are maxed out tho,, I thought there would of been power to spare, cos 5x50 is 250 and my sub is 275watts.
In the pic the low level filter is set to out/LFE....more coffee needed?
Doubling the watts usually only increases output by 3dB.
You say 'only'.
I was under the impression that a 3db increase is perceived by the ear/brain as a doubling in volume.
I fear for your ears in later life if you're pushing speakers to their limits in a room that size
It doesnt hurt my ears as much as my z-680 pc speakers did, I only tried them at full vol once for about 20secs. But I guess thats more down to the high frequencies that the z-680 pumped out..
Im not sure if Ive had these at max vol yet tho, but amp has been at -15db tho, so far
If you don't already own an SPL meter I suggest you save up for one.
The RS SPL meter is available from BK, I think, as well as other places.
You can learn a great deal about your system from an SPL meter.
Even run REW to find out what is really going on.
Have you moved your sub to the same place as your bin was?
Ah, but that might not be the right corner.
You need REW and an RS SPL meter to check properly.
One option that may be surprisingly effective is putting the sub in the large room. Try it (go buy a longer phono cable tight wad ), its surprising how a simple move can totally change things. Generally speaking, a room, or series of connected rooms like that can cause a serious bass suck out so your really missing the bass at the listening position.