Should I suspect my K3118?

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I just bought a used Rel T3 subwoofer, which is supposed to extend to 30 Hz (-3 dB). But when it's connected to my Kinter K3118 (which uses a TPA3118) it has a noticeable dropoff at ~52 Hz.

I don't have another amp to test the sub with, or another sub to test the amp with, so not much opportunity to figure out what's wrong. I suppose I could buy an 1/8" to RCA adapter and connect the T3 directly to my headphone out.

I'm wondering if I should suspect my K3118. From what little I know, that seems very unlikely.

Any suggestions?

Thanks!
 
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