You might also be interested in these 4 ohm speaker resistor.
QuivyLivy High Power 200W Aluminium Fixed Resistor Load for Tube Amp Test and Audio Equipment, Industrial Speaker Load Resistor with Screw Mount(4 Ohm 4R)
[DIVERSE RESISTANCE VALUES] Available in multiple resistance options (1R, 2R, 4R, 8R, and 10R), this aluminum resistor meets various testing requirements.
Trurovem 200W Aluminum Power Resistor 8 Ohm ±5% with Mounting Holes for Tube Amp Load Load Speaker Impedance Matching Audio Equipment Industrial Use(4 Ohm 4R)
[MULTIPLE RESISTANCE OPTIONS] Choose from a variety of resistance values including 1 ohm, 2 ohm, 4 ohm, and 8 ohm, making it suitable for various applications in audio and power supply systems.
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ICXLPMC Current limiting elements 100W% Speaker Repair 4 Ohm Gold Tone Resistance Aluminum Speaker Repair Accessories Shell Resistors