Which Qts/Qtc should I chose?
For an IB, the Qtc of the system is approximately the Qts of the driver. If you like very tight bass, chose a lower Qts driver. If you like the “HT” sound, then chose a driver with a higher Qts. Dual voice coil woofers can be used with a variable resistor in series with the inputs of an unused VC. This allows the “Q” to be adjusted to the listener’s wants/needs. One drawback of this is that the power handling is cut by at least 25%. Here’s a LINK to the Adire Audio article on RDO (resistively damped operation). NOTE 1: using RDO or leaving one VC open will decrease the output of each driver -3dB. NOTE 2: using narrow bandwidth EQ will raise the Qtc of any system. Wideband or shelving filters have significantly less impact on the Qtc I wrote a post on the forum going into detail as to my personal recommendations for the choice of driver ‘Q’. Here’s a LINK to that post. There are those rather emphatic that the Qts for a driver operating in free-air must be ~0.7. If that’s what you want b
