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HK are 7 ohm and the factory amp puts 125 peak watts into them.
Bridging a 4 channel amp would work fine as to increase power. 7 ohms easy to drive.
I tried a set of HKs for a while and ran them for a week without a trunk sub just to see how they would articulate bass. Had roughly 145 watts RMS into 8 available. Ran a 35hz 24db HPF filter to see how they would perform near the amps maximum power.
They seem to take it with no smoke occurring or hearing mechanical limits. But I didn’t run any form of bass boost other than running a JBL house curve and not over driving the amp at the highest part of the curve.
However, they sounded muddy with higher power levels so nothing gained when pushed harder. They also acoustically seem to drop quite rapidly below 50 hz.
SPL / volume wise not a lot of difference between say 125 watts and 200 plus peaks. Maybe a DB in it.
The HKs are at their best in that 65 - 125 hz range and without adding too much power.
Swapped them out in the end.
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