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17:46 Nov 6, 2007
English to Russian translations [PRO] Tech/Engineering - Music / drivers
English term or phrase:vent tunings
It's always interesting to see how your TS data measurements correlate with the factory data. The "40Hz/4H" means second measurements after the drivers had been given some heavy 40Hz massage for 4 hours.
Surprisingly the Qms and Qe are in good harmony, but the Fs and Vas.... Actually I don't mind the significantly lower Vas and higher Fs as we can use a smaller cabinet – and still achieve decent bass. I wonder if the suspension will soften so much it will reduce the Fs by 10 Hz. And subsequently raise the Vas to almost twice the current value. The TS data were done by using a 29.4 litre closed enclosure as I don't like the added mass method on paper cones. The 4 hour data were inserted into the LspCAD box function and the usual range of box volumes and vent tunings for SBB4, QB3 and SC4 can be viewed and some 34-36 litres volume is calculated and with the SBB4 alignment a 30.5 Hz vent tuning is suggested with a -3 dB point of 45 Hz is achieved.