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In the Forum: Horn-Loaded Speakers
In the Thread: Another time aligned 5-way horn project
Post Subject: I am not sure that 18W is enough for 20Hz and reasonable room.Posted by Romy the Cat on: 8/13/2015
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 Murataltuev wrote:
My 20-50hz TH is not very sensitive. HornResp shows 95db for Ang = 2.0 x Pi.So, it needs power. My 18W GM-70 SET can drive them without clipping, but I prefer to keep amp working at 10% of max power to keep distortions as low as possible, so for TH I'm building huge 100W GU-81 amp.I'm not sure about full active approach (6 amps!), but for TH it is the only way.

Hm… Why to keep an amp 10% of max power? You need to keep it in A1 that all that matters. If you have GM-70 and you feel that it drives your TH then do DSET with GM-70. Get rid of your expensive sectional GM-70 transformer and introduce single section but super high inductance iron slab. Optimizing currant and voltage you shall be able to get good 50W out of a single GM-70 for such a low bandwidth. You can easily factor in a 2nd - 4th order filter right in the amp. You even if you have excessive power can ease the GM-70 load and you will lose some of distortions. If I believe that my 18W GM-70 SET can drive whatever it drives without clipping then that would be exactly what I would do. I am not sure why you do the GU-81 is you feel that 18W is enough to you. BTW, the GM-70 is DH and can easy work very much atop of A1. If you have enough current in your driver then GM-70 enters A2 very gently. If you feel that 18W was enough for you then you have a LOT of options. 

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