Steve Browning Posted June 6, 2018 Share Posted June 6, 2018 I see that someone is selling a pair of Hartke cabs that have a switch allowing them to be 4 or 8 ohms. How is this done and does this mean any (I am guessing) 8 ohm driver can be converted to 4 ohms (or some other value)? Quote Link to comment Share on other sites More sharing options...
ikay Posted June 6, 2018 Share Posted June 6, 2018 Some Hartke speakers apparently have a dual voice coil design which allows impedance switching. Here's an extract from a Hartke manual: "The HyDrive HD112 has an innovative dual voice coil design that allows the cabinet to operate at either 4 or 8 ohms impedance. The cabinet has a impedance selector switch on the rear jack plate. If you are using a single speaker cabinet, and the amplifier has a minimum impedance of 4 ohms, set the HyDrive HD112 impedance selector switch to 4-ohms to get the maximum power from the amp. If you are using two HyDrive HD112 together in parallel, for a total impedance of 4 ohms, or adding a HyDrive HD112 to your current rig, set the impedance selector switch to 8 ohms." Quote Link to comment Share on other sites More sharing options...
AdrianP Posted June 6, 2018 Share Posted June 6, 2018 (edited) As ikay said, it's because some Hartke Hydrive drivers have two voice coils. One at 4 ohms and one at 8. For instance, my HY112 cabs can be run on their own at 4 or, together, at 8 ohms each for a combined load of 4 ohms. Mind you, I have run one cab on its own at 8 ohms and there isn't a massive difference in volume when compared to running it at 4. But it does provide a certain amount of versatility. By the way, I don't think that all Hartke cabs have dual voice coils, or even all Hydrive cabs. The one in my KB12 combo is definitely 4 ohms only (as confirmed by their tech support line). Edited June 6, 2018 by AdrianP Quote Link to comment Share on other sites More sharing options...
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