Using cabinet as load instead of dummy load?

[Xander8280]

Does the load need to be a stable resistor dummy load instead of the ever-changing load of a loud speaker?

[xtian]

No, a speaker or speakers would be perfect, except that you'd kill all the people and pets within earshot. The whole point of the dummy load is so you don't have to listen to the damn thing.

[Xander8280]

Haha, mind numbing test tone blasting. Thanks for the fast reply, I'll run a cabinet inside a closet covered with moving blankets like a recording set up.

[Leo_Gnardo]

I'll run a cabinet inside a closet covered with moving blankets like a recording set up.

That should be OK unless the speaker catches fire. Don't think it can't happen.

One other problem, if you're measuring output power of whatever amp you're testing, speaker impedance varies all over the place. You can't assume an 8 ohm speaker is 8 ohms at all frequencies; you'll come up with bogus answers. When you see amp "turning out double the expected power" that's a big clue your speaker is NOT a resistor.

It's best to test amps with both resistor load (to determine power output) and with speakers (to see and do something about parasitic oscillations.)

[roberto]

all the people and pets within earshot

Yes, the resistor has the capability to guarantee good relationships with the neighbours.