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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: Looks VERY good.Posted by Romy the Cat on: 10/2/2017
I need to give it to you and I need to retract my comments
about your bass pipes. I did find them to be ugly in your prototype drowning
but assembled I find them look very present, in fact quite wonderful. Connection al, of then in parallel is good and
bad. The good part is that drivers will not work over each other, the bad part
is that you need a very precise match of Milq output transformer to drive them.
It is a .2-.3 of transformer ratio in
this or that direction and you will be losing dumpling. I hope you have a lot
of tap in your transformer. In some way it is convenient to connect them in
combination on order to have a conventional impedance and then you can tray many
non-custom transformers.
I am glad you made the Melquiades prototype. Drive your bass section with 0dB
digital (max that your DAC outits) and see the voltages you have at grid of
first tube and how close the output tube approached to class A2. With 6C33C you
do not want to enter A2, I would advise to stay under 85% of A1. Load your bass
array, drive full power and get sympatric clipping on your Milq output stage. Then
get with your RTA sweep and see if your 4 driver can load the room. If you have
no enough gain or power then add another pair of your bass tubes. You understand
that the more you put the tubes in duty then easier it will be for everything.
Still, you might try it even now. I did not know your room and if you have let
say -12dB at 40Hz then the given amp or LF section might not be for your room.
There are many options if it is the case, like switching from 6C33C to 211 or
GM70 but I thing if your room is not over 10000 sq feet then you should be fine
with a reasonable amount of bass drivers. My current room is about 550 sq feet and I
get a full 20hz from 6 drivers…Rerurn to Romy the Cat's Site