Hello I have experimented with Vishay,Caddock,
For Loudspeaker networks the Duelund was the best IMO at dissapating heat,and a Very neutral and natural presentation .
Recently I heard from friends across the pond in the U.K about the newest
Best resistor ,also incorporating a ground off the Copper chassis.
A company called Path Audio,hand made in Poland. They are a bit pricy
But the most natural resistors I have ever used.this includes others that have many years in the field. These resistors do take a solid 100 hours
Before fully settled in. Well worth the expense,$35 retail and at a 1% tolerance The best in the business for a Loudspeaker Xover.