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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: The time will show.Posted by Romy the Cat on: 10/2/2017
 anthony wrote:
Thanks Romy.  To be honest they look better in the flesh than I had thought they would so I am very happy with them.  I think I'll make the steel order today so I can finish them at my leisure.

If I end up with 8 drivers a side, which is what I am planning, I have the option to mix serial and parallel wiring to get to the ideal impedance load for the Bass OPT.  It will be very easy to change the wiring on a whim.  

My room is 406 sq feet, so quite a bit smaller than yours and I am sure 8 drivers a side will be plenty to load the room.  My main concern is whether my dac has enough output (about 1.5Vrms I think) to drive the DSET to the required volume.  If it does not then I will have to investigate a gain stage.
  
Yes, they do look in flesh distinctly different and frankly quite beautiful. Somebody who is looking a commercial venture out it should take notice. With a room of 400 sq feet you should be able to go away with 6 drivers in case you have not completely open floor plan and the room has as least some walls. 8 drivers still will be better, 44 drivers will be even more better… About the DAC. The 1.5Vrms is relatedly high voltage, most of the line level devises have 500mV. No one knows of you have enough gain for your room, it is depending from so many factors. In worse case you can always get a preamp with gain, there are tone of them out there you just need one with VERY low output impedances and preferably a direct coupled. The Milq has 4.5V at the grid of first tube and it is swallow any voltage with no need to inject a feedback to rise the bias and Lamm does for instance. The first stage has ~33dB gain, the second stage 4 time gain if I am not mistaken, so figure out how much you have burned in your output transformer. To calculate gain is not hard to figure out how much gain your room need is much more difficult. With very good recording that has a very low compression you would need MUCH more gain but “thankfully” we do not has a lot of ultra-low compression recordings…

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