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Video shows table top setup, but you mention PC use. Have you tried to bump up the bass output from the computer tone/equalizer controls?Don't know how low your speakers go, but a low crossover frequency is desirable. 80 Hz might be ideal, 120 Hz is about the upper limit before you begin to localize the sub (hear where the sound of it is coming from).BTW, HSU makes a "mid bass module" that works well with small speakers. It's not marketed as a subwoofer (only rated down to 50 Hz), but uses a light weight cone to better integrate at slightly higher frequencies.
Video shows table top setup, but you mention PC use. What is the primary application? Many report that in desktop (near-field) use, subs have a difficult time integrating with the speakers due to high crossover frequency needed to accommodate the smaller desktop speakers, relative difference in distances of speakers versus sub, and sub location under or to the side of the desk. Have you tried to bump up the bass output from the computer tone/equalizer controls?Don't know how low your speakers go, but a low crossover frequency is desirable. 80 Hz might be ideal, 120 Hz is about the upper limit before you begin to localize the sub (hear where the sound of it is coming from).BTW, HSU makes a "mid bass module" that works well with small speakers. It's not marketed as a subwoofer (only rated down to 50 Hz), but uses a light weight cone to better integrate at slightly higher frequencies.
If you have a Tripath TA2024 the speaker grounds are isolated so you shouldn't make a speaker level connection to a subwoofer whose speaker level inputs have a common ground.If you don't have a pre out on the amplifier you may be able to add an isolated speaker level to line level adapter to use the line level input(s) on a subwoofer.Your solution #3, might be the best, replacing the amplifier either with one that has a subwoofer line level output or a 2.1 amp (if you can find or DIY a passive subwoofer).Of course adding two independent powered subwoofers with speaker level inputs would also solve that potential problem.Steve