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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: MMG MiniDSP and bi-amp Questions posted by JBen on February 23, 2012 at 21:33:45:
For a first order LP filter fc= R/(2*pi*L) which works out to 290 hz for a 4 ohm load with a 2.2 mH inductor. For a 2nd order filter the fc= 1/[2*pi*sqrt(L*C)], so for the original MMG this is 1/[(2*pi*sqrt(2.2*24*10^-9)] or 680 Hz.
I was unaware that the original MMG tweeter had an impedance of 2.6 ohm, in which case the fc is 2550 Hz as you stated. I will need to update my spreadsheet.
BTW, Tasmon reported the woofer inductor as 0.75 mH while the official schematic (both on the Tweaks page) is 2.2. I never understood why one would want to go to a capless crossover as the inductor is the least ideal of the passive devices -relatively expensive, poor tolerances, very real capacitance and resistance, limited values, etc.
"Our head is round in order to allow our thoughts to change direction." Francis Picabia
Edits: 02/24/12
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Follow Ups
- RE: MMG MiniDSP and bi-amp Questions - neolith 07:03:21 02/24/12 (2)
- RE: MMG MiniDSP and bi-amp Questions - Davey 08:58:51 02/24/12 (1)
- RE: MMG MiniDSP and bi-amp Questions - JBen 12:04:42 02/24/12 (0)
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