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I see, thanks TimT. I was thinking the ports sticking out were some sort of horn tweeter. No wonder the high frequency is not there.
Check your 901's if they are 8ohms and the tweeter you are adding is 8ohms with a small resistor in between you should be ok for impedance, the NAD 2200 is rated for 4 ohm loads.
Order a assortment of 10w 2,4,6,8 ohm power resistors and a assortment of non polarized caps and splice a wire from the tweeter back to your listening seat, then you can just change between the caps and resistors while listening, start by running one speaker to get it close.
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87 930,
Last edited by 908/930; 04-02-2021 at 01:34 PM..
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