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 Quadrant QS-2
Dual 3 1/2" aluminum woofer; dual 1" hybrid titanium tweeter; Freq. Resp. Hz 85-22K
 
 Quadrant QS-4
Dual 4 1/2" aluminum woofer; dual 1" hybrid titanium tweeter; Freq. Resp. Hz 75-22K
 Quadrant QS-8
Dual 5 1/4" aluminum woofer; dual 1" titanium tweeter; Freq. Resp. Hz 60-22K
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