A dichotomy on amplifiers for good bass? 'Tight' if you like, but I prefer accurate, or true to the live event.
Some suggest only tube amps supply bass that reproduces the live event well.
Others that only solid state amps have the raw power required.
May I suggest the reconciliation is in the power supplies. All accurate bass reproduction needs very stiff power supplies that allow the amp to control big woofers rigidly. The best amps of every type have big power supplies. When I switch on my big Krells the houselights dim as the huge capacitors suck juice from the wall. Big ARs have massive transformers.