Are there really speaker cables out there that are so bad that they could possibly cause a speaker -- one that is well known to have excellent bass -- to sound like it has "not much bass at all"? That's a sad state of affairs, if true.
I vote for a phase issue. With 10 connectors, it would be easy to accidentally swap a pair.
I vote for a phase issue. With 10 connectors, it would be easy to accidentally swap a pair.