Originally Posted by hummer28
I see that there are two padded plugs in the ports of each speaker. Should I leave them in or take them out?
The foam plugs are primarily to seal the cabinets during shipping. They must both be removed to tune the speaker as it was designed and in order to reach the rated F3 bass cutoff frequency spec.
However, as has been mentioned, they can (both) be left in place to convert the system to an overdamped sealed system -- read: give the speaker a much higher but shallower bass rolloff.
The issue with the latter "alignment" is that it reduces mechanical "power handling" -- the bass drivers may bottom out and will
bottom out far sooner if used at maximum levels than if the speaker is used as intended.
But there is an added feature here, if used carefully. Setting a sealed speaker system to 80Hz highpass in the processor -- taking out the bass electronically -- can ease the crossover transition to the subwoofer. In other words, if you are sure to use a sub and if you are sure to electronically limit the sealed speaker as I mention, it may
be possible actually get a smoother, more ripple-free transition between main speaker and sub if the main speakers are sealed with the plugs.
This is a fairly universal concept and can apply about as often to other speakers as it can to the Divas. There's much more to it I won't get into as it relates to establishing symmetrical crossover transitions for both the mains and the sub and also include factoring in all the electronic filters in the system(s) as well as all the natural acoustic slopes present. It all gets tricky. Regardless of what speaker or brand you use, drop us a note for more on main-to-sub tuning; it's a common problem area.
So, the plugs should be removed for the majority of uses
. We prefer users do not use just one. But if you use both and if you cross the speaker out below about 80Hz, a careful tuner can enhance overall system performance. with no loss of maximum output or increased chance of damage