DTQWT, built by
Ralph/Belgium
I have built and cherish your DTQWT's
about two years ago. I have always been a quad ESL63 listener and have
never found a pair of speakers that satisfy me for any length of time
other than your DTQWT's although very different speakers. I'm tired of
placement and maintenance issues with the quads. Unfortunately I have
recently moved to a small apartment in Brussels and the DTQWT's are
now in storage. We are currently renovating a house in Italy which
will be their new home... eventually? In the mean time I am sure your
3 way classic will do a good job for this current space. I was torn
between your Quatro and the 3 way Classic. Just not sure about a 2
way? In case you are interested I ran the DTQWT's with aTubes4HighFi
low gain modified Dynaco ST70 and a Transcendent pre amp. I have also
built a dac using the teachings of Lukasz Fikus.. (very good dac).
Many many thanks for your hard work and your kindness sharing it. You
have provided me with a lot of pleasure. Warm regards, Ralph.
DTQWT built by Christer/Norway
Hello again.I
have finished my dtqwt speakers,and absolutely love
them.I think its one of the best speakers I have heard.
It plays effortlossly and dynamic.But running the
midwoofer fullrange I have experiensed overloading it
acouple of times. (I know that is REALLY LOAD, but
nevertheless...) I was wondering if you have any
experience in any 3way design using the same
tweet/midwoofer? If so do you think you could help me
with possible suggested cab/network design? With best
regards Christer.
Hi Christer, Thanks for sharing your
experiences on the DTQWT. I sometimes use my Jungson amp
for the DTQWT and yes, they can play very load, but it is
possible at extreme levels to exceed the loading of the
horns. Most likely you'll also exceed Xmax for the 8008
front driver too, being +/- 3 mm. I have to say that at
these levels both our ears and the driver's voice coils
may suffer overheating - and damage. If we want disco
levels, we're into another ballgame and I have no
immediate solution for this. Something like the 8008
based construction made by Lennart/Sweden, but I have no
details on this speaker. http://www.troelsgravesen.dk/JA8008_response.htm. Best regards,
Troels
Hi Troels! Thanks again for your quick
reply!
I first want to say I think I`m falling in love with your
dtqwt design. I ended up using the eminence kappalite
3012 ho drivers for the rear bass. I ordered them from
BlueAran UK,with really good price and service. As for
the sound,they never seem to stop amaze me. Super smooth
and detailed midrange with perfect integration to the
tweeter. The bass is very dry and fast but yet meatfull
at same time (strange way of describing it but it is how
I would describe it in a simple way).
The dynamic capabilties is what impress most for first
time listeners, I would say its right up in the class
with Klipsch and the like. The only downside for me,but
not even close to a problem even waaay over normal
listening levels, is overloading of the midwoofer at war
volumes. With the house alone and the guys over for beer
and Infected Mushroom and the like in the playlist I have
experienced overloading of the midwoofer. But it is an
almost impossible task to demand perfect reproduction of
acoustical jazz and classic music AND be able to be
driven fullrange and play techno/heavymetal at war
volumes from one speaker, but I think this one comes
really close. I also think I might have solution for the
problem. I am saving up for the McIntosh Ma 7000 which
have pre out/main in built in. I think I might run an
active crossover between at maybe 50-60 hz and build a
Bill Fitzmaurice Tuba HT subwoofer for the lowest
octaves. How do think that sounds?
Oh yes,almost forgot: Pictures will come!! Best regards,
Christer.
Hi Christer, As mentioned earlier, REALLY
LOUD calls for special precautions and an electronic
crossover providing a high-pass filter to the front
driver may be worth a try, e.g. 1st order 80-100
Hz. If you use bi-amping, this may be accomplished
by simply adding a series capacitor (a good one) in
series with the input signal. Value depends on input
impedance of actual amp. My experience with bi-amping has
not been good unless the amps are exactly the same.
A passive high-pass filter will require reverse polarity
of front and rear drivers - and I don't think this will
work properly with regard the mutual loading of the
center horn. I that case we would have to separate the
two horns and that's another story and will require a
complete redesign of the speaker. Another year's work!
Best regards, Troels.
DTQWT built by Bertrand/Switzerland
Hi Troels,
I finished the DTQWT a couple of hours ago! I figured I
would send you a quick note since I would not have been
able to make them without your work so THANKS!
So far, I am enthusiastic ;) I might not be fully
objective after so many hours working on them but they
sound really great. It's hard to describe sounds with
words but the speakers sound extremely stable and deep -
if those adjectives make sense. I was listening to
Gilberto Gil and Stan Getz and had to get something in
the kitchen: suddenly it felt like Getz was playing in
the living room ;) The stage picture is very clear and
all instruments sound perfectly distinct.
I'm all very excited about this. I can now admit that I
was a little nervous building speakers without having
actually heard them. I started like planned for Easter. I
did most of the work at my inlaws (my dad in law has a
large workshop with many more tools than I have) which is
why I finished so late. It took me about 80 hours to read
and then plan (I decided to go for slightly modified
cabs), and then about 100 / 150 hours to build. You were
right on all your pieces of advice: it took me more time
and more money than planned ;) but was worth it...
I still need to finish the cabs (laqueer etc.) but I
wanted to test them first before going on. I'll send ou
pictures then.
Again, a big warm thank you for sharing this like you do.
It's been very exciting to build those speakers, I now
look forward to long hours of musical pleasure!
Take care, Bertrand
|