Kocour píše:
Tvuj sixpack, mas zadane i souradnice Y u jednotlivych repro? Mas zaskrtnute Vertikaly v Preferences? Meril jsi kazde repro v jeho ose? Na to vsechno pozor, grafy se pak dost meni.
Nize je citace primo od Kimmo Saunisto. Priznam se, ja stale nepouzivam koordinaty polohy repro. Nicmene, jestli tomu spravne rozumim, pri konstani poloze mikrofonu (napr. miriciho na stred vyskace) bych mel pro kazde dalsi repro spocitat casovy posun dle jeho vzdalenosti od toho vysakce a pak o tento offset posunout zacatky impulsu vsech mereni prislusneho repro a pak zadat do Vituixu prislusnou hodnotu koordinatu osy y ?
Kód:
I suppose you're aware that simulated power response and DI are not correct if position of all drivers is X,Y,Z=0,0,0? Typical error is about 2 dB at crossover frequency with acoustical L-R i.e. phase matching.
Minimum phase extraction produces wrong result to high off-axis angles due to missing path length around cone/horn/wave guide and box edges, and fully or partly dipole drivers due to wrong polarity to rear sector. So MP extraction is fundamentally bad method which is banned for good.
Proper method to convert measurement data captured at constant mic position and the same time window and reference time settings so that you could enter actual driver locations to simulation is to subtract delay difference to axis origin (on the baffle surface) from all measurements of each driver. For example if measurement distance is 1000 mm and mic elevation is constant center of tweeter and mid-range driver is located 150 mm below tweeter (all drivers in straight/non-stepped baffle), Delay [us] parameter for mid-range driver is negative (1000-sqrt(1000^2+150^2))/344*1000 = -32.5 us. Own delay values for woofers of 2.5-way, which should have individual measurement data too. After this correction you can enter actual coordinates to all driver instances in XO. Verify that phase of axial response stays quite close to unchanged compared to original situation with X,Y,Z=0,0,0 when listening distance is set temporarily to 1000 mm in Options window. If okay, restore 2500...3000 mm to listening distance and check that vertical off-axis works as it should be giving more correct power & DI readings.