Wally wrote:

I'll see if I can
post a pic illustrating my current settings, which don't make the
sound flat, but give it a bit of a lift as it goes down.

Here y'go - my current DSP settings.

http://audio.yachtsea.com/BassDSP.gif

Note the drop around 80Hz, and again at 25Hz. The latter is the resonant
frequency of the driver, not sure what's happening at 80 (and 63). Even with
+9dB on 20Hz, it's near impossible to pick it up, whereas there are
collywobbles at 25 and, to an extent 32. After that, it becomes much more
distinctly an audible rather than a visceral thing.

At the other end of the scale, I threw a function generator at my preamp a
few weeks ago, to see how high it went. It laughed at 100KHz, but looked
rather wayward by the time it got to 4-500KHz. It seemed to be fine at a few
hertz as well, but I can't remember when it barfed (the generator goes down
to 0.1Hz, and I got bored watching the dot slowly make its way across the
scope's display - at a guess, it was probably happy down to 4 or 5Hz). I'm
talking about amplitude of a sine wave, here - I was just look to see when
the signal got noticably attenuated. I was surprised at the HF end!


--
Wally
www.wally.myby.co.uk
Call me a saint, call me a sinner - just don't call me... late for
dinner.