Help with Hornresp? in Technical/Modifications Posted November 15, 2014 I have been playing around witha LS type bass horn. The throat extends into the dog house and the driver is a 12" But it is still a short bass horn with the same mouth area as a LS. In my horn at least the basic response is set by horn lenght and mouth area. Different flares and chamber sizes does not make a big difference. These things can be used to change the knee above the high pass drop off.