Subwoofer VERY weak
According to the KLH manual for the 9906 "6 pack" with the BassBite sub... it says "if your sub is connected via the speaker - level terminals, your reciever must be set for "NO" subwoofer - even though you are using one. VErify proper polarity on your speaker connection wires. (red or gold to +, black or silver to -). Depending on how you have your woofer connected to the reciever, if connected to a reciever without a subwoofer out then set your reciever for LARGE speakers and turn the subwoofer setting "OFF". Failure to do so will result in little to no bass. If you do have a subwoofer out from your reciever adjust your speaker size setting to small or large speakers as appropriate. Set the recievers sub output to ON. Connecting small speakers to a reciever set for LArge speakers can result in damage to small speakers.
Hope this helps.