I am planning my own DSET build. I have based my speakers on your Macondo and
am busy turning MDF horns in my spare time.
Once that is over I will move onto amplifiers. I plan to build a fullrange Melquiades for a
friend and then if that works out the DSET 6 or 7 channel version for myself.
Of course I have read the threads and am reasonably familiar
with the evolution of DSET Melquiades in the context of your system but there
are still a few questions. The question
at the front of my mind is the following hypothetical:
“How would you proceed with another DSET build knowing
what you know now?”
If you are willing I would like to work through this in
stages. This is a project that will
evolve with time as I build the speakers and move them into the new room. Initially there will be 5 Channels:
Raal Lazy Ribbon - Direct Tube
S2 into 400Hz tractrix
S2 into 250Hz tractrix
Fane 8M into 115Hz tractrix
Scanspeak 25W/8565-00 towers – 8 drivers each
Then, if the results are satisfactory and the final position
of the speakers in the room permits I will experiment with:
K15/40 Midbass Horn
A very familiar system to you indeed, and I hope you don’t
mind me using it as my starting point. I
don’t want to spend a decade or two trying to develop a satisfying horn system
from scratch so I am using your documented experiences to make a strong start so
that with any luck and a measure of persistence my system is matured within a
couple of years and I can let the whole diy thing pass for other endeavours.
So, to start, I am unsure of a few things regarding the
operation of your amps.
Bias adjustment in the first stages. Looking at the final 6 Channel circuit
diagram the bias for Channels A, B and C are all fixed and non-adjustable. How do you manage the varying gain of the
What is the output from your pre-amp?
Mine is 1.5V RMS and 33 Ohm. I am
trying to get an idea about my required size for the 30K input resistor.
ULF through the Scanspeak line array. My calcs are that at 15W, the SPL at the
listening chair would be about 98dB at 20Hz, and much higher at 100Hz. This is loud enough for sure, but in your
experience is the 6C33C/Scanspeak combination good near the amplifiers maximum power?