JBL 4343 min Impedance?

[audiomagnate]

I don't know if this would hold true. I know some pro speakers are designed specifically for use with low output impedance amplifiers (i.e. generally speaking, solid state). I know this is the case with the UREI monitors, but don't know about the other pro control monitors (43xx). I had a difficult time finding a tube amp that worked well with UREIs until I tried one that has an output impedance under 2ohms. I think it would be worth trying the 4ohm tap even though it involves soldering.

Anyone with knowledge of this model and crossover have thoughts?

I think he's already got them hooked up to the four ohm tap. No anything required for that suggestion.

[Mikhail]

Are the outputs of the amps modded? If not, just connect to pin 2 instead of pin 3. No soldering required.

In my case, simply can not be connected. Such a device amplifier. The photo shows a native connection 4-pin:
I do not have a native plug. On the other side of the amplifier previous owner installed ordinary terminals which is soldered to the output 8Om:
According to this soldering. Only solder. By this I interested in whether 4Om is better?

[remusr]

I know little about tube amps but doesn't a source transfer power most efficiently when load impedance = output impedance, but for audio use the load impedance should be higher than the amp's output impedance for the amp to control it? To couple and to damp loudspeaker voice coil feedback? So the 4ohm tap may not give as much power but would give better fidelity for speakers with a min impedance of 7.3 ohms and a nominal impedance of 8 ohms. Right?
I am having problems with my Japanese today so couldn't read the linked MB88 specs. I'm with Rusty - there must be someone experienced with this old amp! Maybe not on this forum but on vintage tube sites?

[Mikhail]

Per JBL original spec sheet: Min 7.3 ohms at 213Hz. Nominal impedance 8 ohms. DCR 6.39 ohms.

What does it mean: DCR 6.39 ohms?

[martin2395]

It is the resistance of the coil when meausred with a multimeter.

[Mikhail]

It is the resistance of the coil when meausred with a multimeter.

Thanks

[remusr]

What he said. Direct Current Resistance as you measure with a multimeter. Not same as impedance which includes capacitance and inductance effects and varies with frequency.