Hello,
When I last talked to tech. support from McIntosh, I wasn't sure what the impedance was on my speakers either. And what the tech guy told me was to hook it up to the lowest ohms available, in this case, 4 ohms. Macs are autoforms any ways, so don't worry about doing any damge to the speakers or not providing enough juice to the speakers. If I'm not mistaken, all Hales are rated at 6 ohms.
Just my 2 cents,
Tim
When I last talked to tech. support from McIntosh, I wasn't sure what the impedance was on my speakers either. And what the tech guy told me was to hook it up to the lowest ohms available, in this case, 4 ohms. Macs are autoforms any ways, so don't worry about doing any damge to the speakers or not providing enough juice to the speakers. If I'm not mistaken, all Hales are rated at 6 ohms.
Just my 2 cents,
Tim