08-09-2006:
Hej Troels!
Nu har jag provspelat mina C17 högtalare, och
dom låter helt fantastiskt. Har bara spelat
några timmar ännu, men de spelar redan skjortan
av mina audiovector K3. Var uppe till kl:2 i går
natt skulle upp 07.00 kunde inte sluta. Dom
verkar passa mina Audion 300B monoblock perfekt.
Åter kommer med lite bilder om du är
intresserad.
Mvh Åke
Thanks a lot to Aake for the
report and pics. I wish I had a pair of these
300Bs. My translation below.
Troels
(I'm in the process of
testing my C17 speakers and they sound just
great. Only a few hours old, they leave my former
Audiovector K3 far behind. Was up until 2am last
night and just couldn't stop. They seem to fit my
Audion 300B amps just perfect. I'll mail you some
pics if you're interested. Regards Aake.)
01-10-2006:
As can be read at C17-III, Aake pointed to some
problems with the tweeter and the notch filter
was changed to make an overall flat impedance,
and the level at 500 Hz was reduced further to
some 35 dB below average level.
After the mods, Aake made these notes:
Nu har jag provat nya
filtret och det blev en klar förbättring, inte
bra på lite högra ljud volymer utan även på
låg volym. Diskanten spelar helt enkelt lite
renare. Nu när jag har lyssnat på
högtalarna ett tag och räknar med att de är
inspelade så har jag kommit fram till följande.
Det som är riktigt bra med högtalarna är
framför allt upplösningen och ljudbilden där
djupet är helt suveränt. Högtalarna passar
perfekt till akustisk musik. Det som är
mindre bra är basen, som i och för sig är
snabb och ren, men spelar lite väl lågt och
inte speciellt djup, vilket gör att det låter
lite klent. Brukar använda min subwoofer för
att få lite mer tyngd i basen, speciellt när
jag spelar rock musik. En annan nackdel som bara
inträffar när man vill spela lite högre, är
att ljudbilden faller sönder och smetas ut.
My translation:
I have now tested the new
filter (-for the treble) and this is a clear
improvement, not only at fairly loud levels, but
also at low levels. The treble is simply cleaner.
I have now been listening to the speakers for
some weeks and assume they are fully broken in,
and this is my conclusion: What is really good
with these speakers are first and foremost the
resolution and depth to the soundstage. These
speakers are perfect for acoustic music. What may
be limiting is the bass, which is fast and clean,
but may not reach particularly deep and lead to
some compression. If I add my subwoofer I get
more low-end extension and weight, in particular
when I play rock music. Another disadvantage,
which occur when you play loud, is that the sound
starts compressing and details are smeared.
My comments to Aake's notes:
Thanks for Aake for his notes and I'm not
surprised. My younger friend, Martin, came by the
other day to hear my latest speakers and Martin
usually brings some - well, really difficult CDs,
like heavy metal and contemporary rock music,
which we play at really loud levels and he was
quite surprised to hear the C17-III dealing so
well with some of the well-recorded heavy stuff.
So much, he's seriously considering building a
pair to supplement his Point75s, realising that
no speaker does it all.
The C17-work and comments
from Aake will bring some writing soon on how we
choose speakers and how we "read" a
speaker construction in order to suit our needs.
In the case of the C17, we have lightweight paper
cone drivers with a Fs of 50 Hz and we have a
sensitivity of 95 dB/2.8V from a 35-40 litres
constructions and the experienced speaker builder
will soon know what this means in terms of bass
extension. The 1st order filter will also tell
that the overlap between drivers is huge, which
limits the possibility of playing e.g. rock music
at excessive loud levels. What is does bring is
the magnificent midrange of the C17 drivers and
an unusual level of transparency thanks to the
simplicity of the crossover. We are into SET
low-wattage amp, high-efficiency paper cone,
one-cap territory here and we have to know the
pros and cons..
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