Quoted from mbwalker:Electrical engineer here...
Old thread, but I should probably chime in here. A better way is to convert to a low-level using an adapter, and use the low-level input to the woofer. By using a low-level adapter, it presents a a somewhat high impedance to the pin's audio amplifier (i.e. you're not connecting another woofer in parallel). The audio adapter is used primarily by car audio guys when they need to connect an amplifier/woofers.
When you used the mixer in your original post, you likely overloaded the mixer.
The adapter below attaches to the pin's woofer, then it outputs a level appropriate for a mixer or the line connector on an active sub. It also acts as a 'BALUN' (important for some pin's amplifiers, like a SPIKE) and breaks any ground loops.
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On a related question, I have a racing arcade that has 5 speakers. Two above the monitor, 2 in the headrest and one woofer under the seat. The woofer under the seat is supposed to give a tactile feel, so when you go over bumps and stuff it vibrates. The issue is the game is too loud for my house I'd I set the level to feel the bass in the seat. To my understanding, just adding potentiometers to the other 4 speakers to reduce their levels so I can feel the bass but not go deaf from the music would put excess load on the audio board because of the increased resistance, correct? So what would I use to allow the seat level to be louder? It's all speaker wire going to each speaker, I don't have low level line outs to work with. Just a dummy amp where one volume control built in the software controls all the speakers.
