From dta3923@yahoo.com Sun Dec 18 07:14:56 2005
Subject:Re: How to Beef Up a used Roland KC-300 or 350
Thanks for the explanation Walter.
Dan
jake92028 wrote:
--- In CloneWheel@yahoogroups.com, Dan A wrote:
> Walter,
>
> What do you mean when you say the woofer went "flat"
acoustically? Are talking about some sort of break down with the
cone??
Yes, but not exactly, since I don't really know the right term for
it, but have heard it called "going flat," so that's what I call it.
I heard it up close with my own KC300 amps after pushing them hard
for nearly two years. It's not the same as the EQ term "flat" which
is no EQ applied either up or down, treble, mid, bass controls at 12
o'clock, but there is a similarity. In the Roland KC amps at loud
volume over time, it's like the fabric/paper structure of the cone
loses its design stiffness, maybe range of travel back and forth with
the input signal. Notes and chords played into them at high volume
lose the original musical response and have a dull or "flat" overall
response, almost like the speaker turned into a cardboard box, except
it still plays.
We used to take an old 80's Roland Cube-60 keyboard amp everywhere,
in case another player wanted to sit in on harp, guitar, or bass on
gigs we were playing minus bass player which was a break for me. Its
full-range 12" speaker sounded fine for almost any instrument
although it had just the basic three band EQ knobs - but a nice
spring reverb. We hit a stretch where a bass player dropped in
regularly without his own amp and used that poor old Cube with volume
set on 10 every time, tone controls too, with a low level line out to
the PA. And the same thing happened, the speaker "went flat," started
to sound like a kid whacking on a carboard box with a stick almost to
the point you couldn't tell the note being played. Maybe Roland has
been using the same speaker design for keyboard amps that they put in
the KC's(?)
After I sold my KC300's for MS KT80 amps, I was really impressed with
the Eminence woofers. So to save the old Cube, I got an Eminence Beta-
12 and put it in. It took about 45 minutes being careful, since I
hadn't swapped a speaker in years. That little amp is still with us
and sounds fine with anyone/everyone plugging into it to sit in for a
few numbers. Considering its age and abuse and the tech level when it
was made, it's still a fine amp with reverb. The speaker swap made it
almost good as new - Roland has no parts, like new pots or whatever
for them anymore. Walter j
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