From james_eaton@btopenworld.com Fri Sep 17 12:48:30 2004
Subject:Re: amps

--- In CloneWheel@yahoogroups.com, "Steve Beach"
wrote:
> Would anyone care to guess what the crossover point might be for
the Roland KC-550? What frequency response would the woofer need
to be capable of sounding? Would 40hz - to 3.5k be adequate? Is
that what you mean by 'Fs'?

No data on their website. (Frequency response data conveniently not
included either...)

In their reference monitors they seem to use 2.3-3.3kHz.

As a comparison, the JBL EON 15 uses 1.5kHz through a 1" driver
driven by a 100W amp.

I would hazard a guess at 2 to 2.5kHz. It's going to be much
higher than a Leslie crossover point of 800Hz because HF drivers
that can handle these frequencies are too big to fit in this box
with that 15" driver in there, too expensive for this price range,
and aren't necessarily going to have the high frequency range
required for this application.

On another note, I must be missing something here, but according to
the spec sheet, the KC-550 is rated at 180W RMS output power yet it
only consumes 135W of [input] power from the line. Something for
nothing? This must be a very efficient amplifier!!! Any
explanation offered for this?

James