"Greg Williams" wrote in message
...
Hi folks,

I have a Velodyne F1000 subwoofer that I have had for around 9 years. It
is
a 10" 80 watt servo model.

I was setting it up in a new, larger room today. I spent the better half
of
an afternoon configuring the sub with a Radio Shack SPL meter and test
tones. I was able to find the spot where it was flat as it was going to
get
(within +- 2 db) from 30 Hz to 100 Hz . The spot was directly behind my
listening postion. When the sub was in the corner, there was a nasty 12
db
room mode at 40-50 Hz that was activated.


I had the same problem but solved it by plugging the ports on my main
speakers.

This room is about 3600 cubic feet large. The common knowledge is that
larger rooms require a larger driver and more amperage. Would upgrading
to
a sub with more power and a 12" or 15" driver offer any advantage? I know
that I would be able to get more SPL out of it.

Depends on how loud you need it. Remember 3 dB increase takes 50% more
power, assuming the drivers have the same sensitivty.

Would there be any other
audible difference with a larger driver if the subs are putting out the
same
SPL at the same frequency?

Depends on the driver. I would consider a 12" woofer to be the bare
minimum, a big room could use 3 of them to get proper bass.

I do most of my listening at 80 Hz, and my current little sub can produce
that easily done to 30 Hz. Is there any point upgrading?


There is if you want to make sure you get all the bass that's possible and
play it cleanly. For me that means using Adire Audio drivers.

Thanks,
Greg