Is there any subwoofer can be cheaper than Velodyne-CH10 brand ? As i currently under budget and i own a Yamaha YST-SW315 subwoofer.

Thinking of selling my current Yamaha SUB and upgrade it.

i mean the quality can compare with Velodyn CH-10 ?

My fren recommended me POLKaudio.

How bout u guys?

Thanks in advance