Given the SIT-1’s very high 4 ohm output impedance, and the fact that it has a lower power rating for a 4 ohm load than for an 8 ohm load, I suspect that the sonics provided by the amp itself would be significantly improved if you were to go to speakers having considerably higher impedance than the "4-6 ohms" of your present speakers.
Regarding the mention of Daedalus, I am a very happy owner of Lou’s Ulysses model, which have a particularly flat and benign impedance curve, but I suspect that their 6 ohm nominal impedance would result in their being a less than optimal match for the SIT-1.
To add to the candidates that have been suggested, if it fits your budget you may want to consider the Devore O/96 (96 db/1W/1m, 10 ohms nominal, 8.75 ohms min).
Good luck. Regards,
-- Al
Regarding the mention of Daedalus, I am a very happy owner of Lou’s Ulysses model, which have a particularly flat and benign impedance curve, but I suspect that their 6 ohm nominal impedance would result in their being a less than optimal match for the SIT-1.
To add to the candidates that have been suggested, if it fits your budget you may want to consider the Devore O/96 (96 db/1W/1m, 10 ohms nominal, 8.75 ohms min).
Good luck. Regards,
-- Al