You're welcome! All the credit goes to EV though for setting up that archive awhile back.

Well, a 288 attached to a long straight tube is around 137 dB/W/m, but as its shape starts expanding it's efficiency drops to where on a 329A horn it's down to ~110.7 dB/W/m and an 802 on a 511 is only good for ~107 dB/W/m, so I'll be surprised if a 288 coupled to a truncated 511 can do much over a 100 dB/W/m.

In the XO's BW, dual 416-8Bs in parallel should be around 103-104 dB/2.83 V/m, so it will be interesting to see if the 511E can keep up.

GM