Originally Posted by dudedah
Is the box being too small something can be remedied with Polyfill?
If it's sealed stuffing it may make it better. It won't work miracles.
Ok...I'm going to ask a STUPID question...High Pass or Low Pass?
The plate amp should have a dial to adjust the low pass frequency, turn it to 50-60Hz. Also change the subwoofer crossover frequency in your receiver to 50-60Hz. If the plate amp doesn't have an adjustable low pass that's just one more indication that it's an el cheapo that might not sound good no matter what you do.