About those 3677S and 4638's with the 2035's. Are these similar enough to the 2226's that come in the 4648A-8's that either work well? Are there any specs for the 2416-1 horn driver that's in the 3677S's? By the specs, they drop below -3dB at 12KHz, but supposedly go to 20KHz within -10dB. Is this correctable with the standard Pi sloping response x-over? Thx, Chris