On Sun, 24 Sep 2006 15:10:37 +0100, "Keith G"
wrote:
There are a few 'wiseacres' here that know it all and will trot out the
stale, old 'FR drivers in horns have no top or bottom octave' hearsay
horse****.
Judge for yourselves - here are two 'identical' clips (end of one track,
beginning of another) of extremely complex/crowded music recorded OPEN MIC
with only a peewee little lapel mic (all I got) with digital/SS everything
except the power amp on the EX3 clip, which is 300B SET valve. No editing
whatsoever, other than a Fade In and Out at the ends to lessen the shock!
This clip is the Lowther PM6C drivers in the Jericho cabinet (10.5 Mb):
http://www.apah69.dsl.pipex.com/show/Clip%20PM6C.mp3
This one is the Lowther EX3 drivers in the 'InFidelio' cabinet (10.5):
http://www.apah69.dsl.pipex.com/show/Clip%20EX3.mp3
It's a job for decent headphones - my computer setup can't resolve the
detail and smart people will overlook the nasty (computer) recording noises
and make the necessary allowance for MP3 compression. Needless to say these
recordings are not the 'Full Monty' (not all that I hear) and a bit
monotonous in the bass, but they will give you some idea - it would be easy
to post summat a lot more sonorous, 'musical' and tinkly, but that wouldn't
prove the point.....
Not much to *enjoy* here, I'm sorry to say - a tough mission*, should you
choose to accept it!
Comments/criticism welcome as always.
* But not *impossible*....!! ;-)
Well, you haven't helped your case any here, Keith. These clips both
bear out the idea that top and bottom octaves are missing. There is
nothing significant below 60Hz, and they resemble the side of a cliff
above about 10kHz. Whether that is to do with the speaker, source
material or mic is tricky to say, but we work with what we have.
Now - details. The PM6es come out a couple of dBs louder than the EXes
- enough in fact to cause quite a lot of clipping (never wanted when
you are trying to assess top octave performance). Is that just the
volume settings on the amps? I guess it is.
d
--
Pearce Consulting
http://www.pearce.uk.com