If you are using low powered (ie. 2-10 wpc) SET and SEP amps, they work better with speakers of higher sensitivity. ie. closer to 100 dB instead of closer to 90 dB.
Don't put a lightweight in the ring against a heavyweight!
If that is all the power you have, try some horns. If you don't want to buy the big dollar stuff, try some Klipsch Heresy, Forte, Chorus, Cornwall, Lascala, Klipschorn, etc. Better the speaker impedance is linear too, othewise there will be audible frequency response issues that you may not be able to overcome with speaker placement.
OP: with your De Capos I would look at 20 wpc as the minimum, which will give you some leeway with different recordings, volume levels and room placements.
Don't put a lightweight in the ring against a heavyweight!
If that is all the power you have, try some horns. If you don't want to buy the big dollar stuff, try some Klipsch Heresy, Forte, Chorus, Cornwall, Lascala, Klipschorn, etc. Better the speaker impedance is linear too, othewise there will be audible frequency response issues that you may not be able to overcome with speaker placement.
OP: with your De Capos I would look at 20 wpc as the minimum, which will give you some leeway with different recordings, volume levels and room placements.