Polk Audio monitor 7 impedance

Timnan

I just got a pair of polk audio monitor 7 on CL for $90, I guess it probably is the 7B with a mid mw6502. As I remembered somewhere on internet says mw6502 has a nominal impedance of 4 ohms. But I do test the resistance with a ohmmeter, it showed me 3.9 ohm, so I guess the impedance should be 6 ohm. The true impedance is very important when I connect the speakers to my receiver as my receiver support a speaker with a minimum impedance of 6 ohm. So I am wondering if I can hook this pair of PA monitor 7 to my receiver? Is that safe to the receiver? Any expert suggestion is appreciated.

F1nut

There's no way to tell the nominal impedance of a speaker from measuring the resistance.

I don't remember if the 7B's are 6 or 8 ohm. Anyway, your receiver when set to 6 ohms will limit current, which can have a negative effect on the sound quality, so try both settings to see which sounds best to you. As with any gear, as long as you don't get stupid, you'll be fine.

westmassguy

This^^^^^^
A typical multi-meter reads DC Resistance. Most drivers' resistance changes depending on the frequency applied to it, which is why they're given a "Nominal" impedance (AKA AC Resistance). Keep in mind, your receiver is "Seeing" a combination of the 8 ohm nominal tweeter, and the 4 ohm nominal woofer. There's also and Inductor in series with the woofer, which adds resistance to the Lo-Pass circuit. I'd say 6 ohm or "8 ohm compatible" would be accurate.

StantonZ

You didn't mention/name your receiver/amplifier, but some brands are known to handle lower impedance loads better than others. FWIW, I had a 4/8 Ohm switch on my Yamaha A1, tried it both ways, and went with the 8 Ohm setting. Give both a try (as suggested above) and ramp the volume (slowly).

Timnan

Thank you all for quick reply. Very nice suggestions.
My receiver is Marantz SR5600 and on the back panel it has a printing "minimum 6 ohm". Since I will use the receiver anyway, I give a try.
Thanks again. Like this forum.