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In the Forum: Audio Discussions
In the Thread: 250 watts Parallel S.E. advises
Post Subject: Active filteringPosted by devo_yan on: 5/30/2018
Thank you for your answer.
If I understand well, In purpose to do something realistic and good sounding. I should use at least 2 amplifiers (one for high frequencies and the GM-100 amp for low frequencies) with a tubes active filter at the inputs of each amps.
So I will have to ask for a custom O.T. that can do 20Hz (or 30Hz) up to 250Hz (or more) for the GM-100
And a O.T. that can do 200Hz-30 000Hz (or more) for a 300B or GM-70 amp
This is what DSET mean, right ?
Yes I read a lot that a good driver is very important, and running in A2 without any clipping could be nice.
I don't know yet what to use as driver. Could a 300B (with is separated power supply of course ^^) and choke loaded with 350v on the plate properly drive the GM-100 ? (or do I need something like a 845 or GM-70 ?) (I mean is it enought drive current and is 240V peak to peak swing (-120V bias) not too much for a 300B ?)
I was hopping to do full range with passive filter because my system have different impedances (HF more impedance than LF so no resistors would be needed ^^):
- 1.5 inch compression driver; 32 ohms; 109dB/1W/1m sensitivity (6000Hz-above)
- 10 inch horn; 16 ohms; 108dB/1W/1m sensitivity (180Hz- 6000Hz)
- 18 band pass horn; 8 ohms; 103dB/1W/1m sensitivity when alone 106.5dB/1w/1m when a stack of 4 (and 2ohms) (below-180Hz)
About the power that I need, of course at home in my smalll room, I don't need more than 0.1 watts (but I still don't know if a small DHT SET can properly drive big bass speakers =s (or if the speakers drive more the amp than the reverse ^^)).
But the system will be for to do outdoor parties (and I want to share with people the same technology that what I use at home) (currently I already have good class AB solid state amplifiers (I use only analog devices) but the feeling would probably have absolutely nothing to do with a full tube SET system).
Ideallly I would need 1800 watts power for bass (4*450 watts), And maybe for less than 800Kg and a budget of few thousand euros it seem to be dead ^^. So I would like to build the maximum output power SET for a maximum weight of arround 100Kg.
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