any new Quad 11/12L owners?

Hi: New 12Ls. After moving speakers away from rear wall about 10 inches, plugged both rear ports with straws to flatten a 6 dB bump around 100 Hz. After the "strawing" peak is under 4 dB and low end is now -6 dB at 45 Hz instead of 50 Hz. Electronics is as follows: Adcom 555 II pre-amp, Musical Fidelity A3cr power amp, Panasonic DVD A-110 plus Audioquest Ruby interconnects and type 4 for speakers. Regards