Low bass and volume

I jst noticed my right speaker is quieter and has less bass than the left. I have sda srs 1.2tl. Parts from Vr3 and home built dreadknaught. Using a adcom 8500 amp and prima luna intergrated amp. Both are functioning. Wiring looks clean and good from the exterior. I'm beginning to look at the dreadnaught first but solders look good. Next will be interior of the speaker. Any have suggestions. Thx in advance

Mark
Living Room Pimaluna Dialogue Premium Integrated, Wyred 4 Sound DAC2-DSDse, Polk SDS SRS 1.2tl by vr3, 2012 mac mini w/ JRivers-24, NAS via ethernet cat 5e, Home built Dreadnought.

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