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Sounds like you have enough output. :flex: Just imaging what the 21" will do with another 40-50% more cone area. The port chuffing will probably not be an issue once you are in the room listening to program material. It is always bad with test tones. Much less of an issue with actual movies/music.
Yea... be careful with test tones. Most of the heat dissipated from a coil is done via convective heat loss. That means that air has to be moving over it. When you get near the port tuning frequency, you will notice the driver's motion drops significantly. That is the danger zone because you may be pushing large amounts of power into the coil and the driver is no longer pumping air across it for cooling.
The Maelstroms have held up very well. I've not seen a thermal failure yet but you don't want to be the first.
Kevin Haskins
Exodus Audio
Yea... be careful with test tones. Most of the heat dissipated from a coil is done via convective heat loss. That means that air has to be moving over it. When you get near the port tuning frequency, you will notice the driver's motion drops significantly. That is the danger zone because you may be pushing large amounts of power into the coil and the driver is no longer pumping air across it for cooling.
The Maelstroms have held up very well. I've not seen a thermal failure yet but you don't want to be the first.
Kevin Haskins
Exodus Audio