"Wally" wrote in message
. ..
The bass response was crap - rapid drop from 70Hz, feeble attempt to
redeem
itself at 25Hz. Boxes are too big (135L) for the port tuning, backs of the
cabs are full of slots. I want *small* boxes and have two spare drivers,
so
I elect to resolve this by building isobaric cabinets. In the meantime, I
use a multi-band digital parametric to sort it until I can get round to
building the new cabs. To be clear: the EQ may or may not be needed when
the
isobarc cabs are built - until then, it's a stop-gap to improve the bass
response from the existing boxes.

What is the easiest, cheapest way to fix crap bass response that comes out
of speakers that are too heavy to conveniently move around, and too big to
move into the room by more than an inch or three? (IOW, too damn big to
experiment with speaker positioning.) I can't think of anything other than
a
60-quid 12-band digital parametric that is far better quality than it has
any right to be at the price. Of the rush of changes that I went through,
this has been the best individual spend of the lot in terms of making the
system more enjoyable. But! Considering that the single Cyrus was
straining
before it had a load of extra bass to dish out, how much of an improvement
would it have been without extra amplifier power? I would have had more

Wally.

I have a message at the end of this thread that summarises my progress so
far. As you see it is all experiment with what I have and have bought so
far.
I have just bought a sig gen and SPL meter on ebay and am about to see
what the response curve looks like. This is of course in my room. I know
that the science of acoustics requires anechoic conditions but I want a
good sound in my room so that's where I experiment. What I want is to
see a reasonable steady SPL reading as I swing through the audible range.
I like the sound already but perhaps this will help to improve it?

Compromise. There's a dangerous word. When I first got my Revox I teased
an audiophile friend who had just paid zillions for a Nakamichi cassette
deck. He said he had Dolby and I asked how he adjusted the level for
different tape types. You can't on a N? Oh dear- compromise then?
Glare from friend.

Anyway. Why not borrow a car sub? (Please read this quietly!) I am
astonished at just how good it sounds. Its a 12" in a small trapezoidal
box, and not a high-spec one at that. Cost about £150. Don't try to
go down to 32 Hz. My son did with one of his super-bass test CDs.
When the entire output of my 500 watt InterM was going into it he
noted that it was warming quite rapidly! And it wasn't making a clear
note either. Yes pumping power into a tightly damped speaker can
make very low notes, I am sure, but not 32.

Peter Scott