I've been using the Dayton Audio Test System to test my scan-speak mids, the 15w8530K01. I've attached my results for the two drivers, also an average of the two and then what the data-sheet suggested. In general things aren't perhaps a million miles away from the data sheet, but I see that Le and Vas in particular are quite different.
I did run the drivers in, for about a week on a 10Hz sine wave with healthy excursion, and have followed the DATs instructions on letting it settle, then setting the USB port and system volume correctly, and have run both the lead impedance and reference resistor calibrations... so there doesn't 'seem' much else to go wrong. The measurements were made with the driver hanging almost vertically in free air (on a bungee), and Vas was achieved by the added mass method via a small magnet and some steel either side of the cone, totalling 65g.
Obviously, I expect 'some' deviation from the nominal spec but I lack the experience to know how much is normal. Can anyone say if this amount of disagreement is reasonable, or should I be looking for some error in my measurements?
Many Thanks
Kev
I did run the drivers in, for about a week on a 10Hz sine wave with healthy excursion, and have followed the DATs instructions on letting it settle, then setting the USB port and system volume correctly, and have run both the lead impedance and reference resistor calibrations... so there doesn't 'seem' much else to go wrong. The measurements were made with the driver hanging almost vertically in free air (on a bungee), and Vas was achieved by the added mass method via a small magnet and some steel either side of the cone, totalling 65g.
Obviously, I expect 'some' deviation from the nominal spec but I lack the experience to know how much is normal. Can anyone say if this amount of disagreement is reasonable, or should I be looking for some error in my measurements?
Many Thanks
Kev