jbl k2s9800 seg wood grain keep or sell?

The amp selection will be in tune with the music you listen to. If you think that the Infinitys sound better than these massive JBLs, than I have to guess that you might be into some rock or other demanding type of music. I would second Jond's choice of tube amps...for your speakers seem to be sensitive enough for them. Furthermore, I would add to the list some sort of pure Class A type of amps, like Clayton S40, with 40 pounding watts for sheer Class A, hot and dynamic power.

No HK or JBL amp, unless the HK is vintage, tube amps will make your speakers sing.

A good choice for tubed power amps are the Sonic Frontiers Power 1, 55watts per channel or the Power 2, at 110 watts, both will run you either between 1-2K respectively. If you chose the power 1, then you might have 1k left, which you can invest in a sort used tubed preamp. Should you chose to go this path, let us know how it works out.

PS: Other tube choices are VK60, BAT tubed amp or the VK200, pure Class A 100watts....around 2k-$1300 respectively.

No HK or JBL solid state amp will allow you to squeeze the best out of that system. JBLs sound either very accurate, but fatiguing in the long run, therefore you need to make you that you get gear that will not add to the brightness or tizziness that those exotic drivers can produce.

Jond, there seems to be a segment of JBLs, especially with horn loaded mid/tweeters and a large woofer that are sold overseas, especially Japan and Europe, that do not get to see the light of day in the US, because JBL or Harman Corp has decided that for the US market, they can sell junkie speakers that meet a certain point. Once in a while, you can see these overseas JBLs appear in Audiogon and even used, they can easily run you around 3K a pair, for the last pair I saw.

PS: Never thought that these JBLs were that power demanding. Of course, relative sensitivity means squat if the impedance curve of the system is not benign for amp at hand.